JP2001086200A - Portable telephone system and method for changing and setting frequency characteristic of receiving signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correspond to a communication environment and a personal taste for hearing a receiving voice by changing and setting a frequency characteristic in a receiving signal at every kind of communication based on the increase/decrease of a level, generating the receiving signal of the frequency characteristic and outputting it by voice. SOLUTION: A control part 1 executes processing control on a radio telephone concerning respective parts, changes and sets the receiving voice (the frequency characteristic of the receiving signal) and executes control for an operation, a processing and visual recognition concerning the change setting of receiving tone. In this case, a user selects an indoor mode or an outdoor congestion mode during a call when an action is executed in accordance with a place (or the environment) while calling and change is executed based on the frequency characteristic of the receiving signal of the mode. Then a portable telephone system detects at least one of a reception electric field strength and a telephone number of an opposite party in the call. When a setting value based on the reception electric field strength/telephone number of the selected mode exists, the value is changed and set to the setting value of the receiving tone. Unless the setting value exists, the value becomes the frequency characteristic of an initial value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone device for changing and setting the frequency characteristics (frequency vs. level characteristics, appropriately referred to as "received sound quality") of a received signal during a telephone call of a portable telephone device, and a receiving signal. The present invention relates to a frequency characteristic change setting method.

[0002]

2. Description of the Related Art Conventionally, a cellular mobile telephone system PDC has been known.
(Personal Digital Cellular Telecommunicatin Syste
m) and cordless telephone systems (eg PHS / Person
With the mobile phone device in the Al Handyphone System), there is a case where the voice output, that is, the transmitted content of the other party is difficult to hear depending on the environment. This is because there is a difference in the ambient noise level between the surroundings during a call, especially the busyness in the city and the silence in the room. Further, in such a mobile phone device, the frequency characteristic of the received signal has a fixed level in, for example, a transmission voice communication band of 300 Hz to 3.4 kHz, and a change in the communication environment (the above-described busy in the city and silence in the room). And the ambient noise level, etc.), and personal preference.

Conventionally, as an example of this kind of countermeasure improvement, a “noise prevention device” is disclosed in Japanese Patent Application Laid-Open No. 5-224681. FIG. 8 is a block diagram showing one configuration of a conventional noise prevention device.

In such a configuration, the noise prevention device amplifies the audio output signal from the communication device 20 and the ambient noise from the microphone 21 via the phase inverting amplifier 22 and the gain adjuster 22a and makes them out of phase. The ambient noise signal is output to the output signal mixing circuit 23, and the sound is output through the speaker 24. In other words, by setting the ambient noise to the opposite phase and canceling it, the communication device 2
The noise is removed without affecting the sound output from 0 to make the sound output easier to hear.

In a "mobile telephone having a voice band limiting function" disclosed in Japanese Patent Application Laid-Open No. 7-273840, a reception signal from a mobile telephone is passed through a high-pass filter or a low-pass filter. In this case, if the noise level detected by the microphone is equal to or higher than the reference value, the output of the reception signal is switched from passing through a low-pass filter emphasizing sound quality to passing through a high-pass filter to cut low-frequency sounds and reduce noise. On the other hand, the reception signal is easily heard.

[0006]

However, in the above conventional example, the frequency characteristic of the received signal is fixed, and the level of a predetermined frequency band cannot be changed. There is a problem that it is difficult to cope with a difference in ambient noise level between a crowd and silence in a room and personal preference.

The present invention has been made in view of the above circumstances, and can change and set a received sound quality (frequency characteristics of a received signal) in a portable telephone device, and can cope with a communication environment and personal preference of listening to a received voice. It is an object of the present invention to provide a portable telephone device and a method of setting and changing a frequency characteristic of a received signal.

[0008]

According to a first aspect of the present invention, there is provided a portable telephone apparatus for setting input means for arbitrarily increasing or decreasing the level of a received signal in a frequency band. And control means for controlling to change and set the frequency characteristic of the received signal for each communication based on the increase or decrease of the level by the setting input means; and based on the control of the control means, the received signal having the frequency characteristic And audio output processing means for generating an audio output.

The audio output processing means according to a second aspect of the present invention includes a frequency level conversion means having at least one of a filter by analog or digital processing and a frequency variable amplifier, and the control means controls the frequency level conversion means. The control is performed to increase or decrease the level.

The control means according to a third aspect of the present invention includes a storage means for storing the frequency characteristic set by the setting input means.

Further, the storage means according to claim 4 stores frequency characteristics of a plurality of reception signals set in advance corresponding to an environment at the time of communication, and wherein the control means stores the frequency characteristic at the time of communication. The control is performed so as to change and set the frequency characteristic of the reception signal stored in advance corresponding to the environment.

Further, the storage means according to claim 5 stores the received electric field strength and the frequency characteristics of the reception signal corresponding to at least one of the telephone number of the other party, and the control means detects the reception characteristic detected during communication. The control is performed to change and set the frequency characteristics of the reception signal stored in advance corresponding to at least one of the electric field strength and the telephone number of the other party.

Further, the control means according to claim 6 controls the weighting of at least one of the high frequency range and the low frequency level so as to make the overall sound volume constant.

[0014] Further, the control means according to the present invention controls to change and set the frequency characteristic of the received signal within a level range of a predetermined transmission speech quality standard.

The portable telephone device according to claim 8 is
The apparatus further comprises display means for displaying a frequency characteristic of the reception signal on a screen.

Further, the control means according to the ninth aspect of the present invention controls so as to perform a change setting to return to an initial value of the frequency characteristic of the received signal at the end of the call.

According to a tenth aspect of the present invention, there is provided a reception signal frequency characteristic change setting method, comprising the steps of: a setting input step of arbitrarily setting an increase or a decrease in a level of a reception signal in a frequency band; and a communication based on the increase or decrease of the level of the reception signal. A control step of changing and setting the frequency characteristic of the received signal every time, and a sound output processing step of generating a received signal of the controlled frequency characteristic and outputting the sound.

The control step according to claim 11 includes a storing step of storing the frequency characteristic of the reception signal set in the setting input step, and a reading step of reading out the stored frequency characteristic for each communication. Then, control is performed so as to change the setting based on the read frequency characteristics.

The storing step described in claim 12 is for storing frequency characteristics of a plurality of reception signals set in advance corresponding to an environment at the time of communication.

In the storage step, the frequency characteristic of the received signal corresponding to at least one of the received electric field strength and the telephone number of the other party is stored.

The control step described in claim 14 controls the weighting of at least one of the high frequency range and the low frequency level so as to make the overall sound volume constant.

In the control step according to the present invention, when the frequency characteristic of the received signal is changed and set, the frequency characteristic of the received signal is changed and set within a level range of a predetermined transmission speech quality standard. Is controlled.

The method for changing the setting of the reception signal frequency characteristic according to claim 16 further includes a characteristic display step of displaying the reception signal frequency characteristic on a screen for each change setting.

In another preferred form, the receiving signal frequency characteristic change setting method includes, after the voice output processing step, performing an initial setting step of performing a change setting to return to an initial value of the receiving signal frequency characteristic at the end of the call. It also has.

According to the portable telephone device and the method for changing the frequency characteristic of the received signal according to the present invention, a high frequency band (hereinafter, appropriately referred to as a high frequency) in a predetermined frequency band of the received signal is set for each communication. And a level increase or decrease of at least one of a low frequency band (hereinafter, appropriately referred to as a low frequency band), and the read level increase or decrease of at least one of the high frequency and the low frequency (hereinafter abbreviated as a high frequency / low frequency level increase / decrease). ) Is generated and output as voice. It is also possible to change the frequency characteristics of the received signal according to the user's preference. Therefore, the change setting can be performed based on the received sound quality selected from the plurality of received sound quality in the mobile phone device, and it becomes possible to cope with the communication environment and personal preference of the received voice. In addition, the operation of changing the receiving sound quality for each call is omitted.

Also, at the time of communication, the frequency characteristic (high / low level level increase / decrease) of the received signal corresponding to at least one of the received electric field strength stored in advance and the telephone number of the communication partner is automatically selected. And change the settings. Therefore, it is possible to omit the operation of changing the receiving sound quality for each call. Also, by automatically selecting the frequency characteristic of the reception signal selected in advance for each reception electric field strength,
The unpleasant noise sound peculiar to digital processing in a weak reception electric field strength area or the like is softened, and a received sound quality that is easy to hear is obtained.

Also, weighting is applied to the level increase / decrease in the high / low range to make the overall volume constant. Therefore,
The reception sound volume when the reception sound quality is changed and set does not change. That is, when changing the frequency characteristics of the received signal,
The receiving volume does not decrease. For example, in the case of weighting of the high frequency level, lowering the level of the high frequency will increase the level of the low frequency accordingly, and in the case of weighting of the low frequency level, lowering the level of the low frequency will result in lowering the level. By raising the level of the high range in response, the overall output sound volume is stabilized.

Further, the frequency characteristic of the received signal is changed and set within a level range of a predetermined transmission call quality standard. Therefore, when the reception sound quality is changed and set, the reception sound quality characteristic within the range of the communication standard can be obtained. That is, even if the frequency characteristic of the received signal is changed and set, the change setting is not performed outside the level range of the transmission call quality standard stored in advance.

Further, a change setting for returning to the initial received signal frequency characteristic at the end of the call is performed. Therefore, the operation of returning the previous received sound quality setting to the initial value every time a call is made is omitted.

Further, the frequency characteristics of the received signal are displayed on a screen display screen using a line graph or a bar graph. Therefore, the received sound quality can be visually confirmed. In this case, the characteristics when the reception signal frequency characteristics are changed are displayed on a screen in a real-time line graph or a bar graph, and the changed reception sound quality can be easily confirmed.

[0031]

Embodiments of the present invention will be described below with reference to the drawings. Next, embodiments of a mobile phone device and a method for setting and changing a frequency characteristic of a received signal of the present invention will be described in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a block diagram showing a configuration of a portable telephone device according to a first embodiment of the present invention. In FIG. 1, a mobile phone device is, for example, a PDC.
(TDMA system) or PHS (TDMA / TDD system), which is a basic configuration of a mobile phone device, and includes a control unit 1 corresponding to a control unit, an audio signal processing unit 2 corresponding to an audio output processing unit, and a received reception signal. (Speaker) 3 that sends out a sound based on the sound, a microphone 4 that receives the sound and sends out a transmission signal, a radio unit 5, and an antenna 6
An input operation unit 7 corresponding to setting input means;
And

The control unit 1 includes a CPU, a ROM storing a boot program and a control program, and a working RA.
M, an input / output (I / O) circuit and the like. The control unit 1 executes processing control relating to the radio telephone for each unit to change and set a received sound quality (frequency characteristic of a received signal), and performs an operation and a process related to the change setting of the received sound quality, and a visual control. Execute control to facilitate confirmation. Further, the control unit 1 corresponds to a storage unit that stores the reception sound quality changed and set based on at least one of the reception electric field strength and the telephone number of the communication partner (hereinafter, abbreviated as reception electric field strength / telephone number). The predetermined reception sound quality is read out during a call.

More specifically, 1) the level of the frequency characteristic of the received signal is changed and set in the portable telephone device. 2) The setting of changing the received sound quality every time a call is made, based on the set value of the received electric field strength / telephone number stored or set. 3) Attenuate harsh noise to obtain an easy-to-listen received voice quality 4) Omit the operation of returning the previous received voice quality setting to the initial value every time a call is made 5) When the received voice quality is changed 6) Making the received sound quality visually recognizable. 7) Obtaining the received sound quality characteristic within the communication standard range when the received sound quality is changed and set. Note that these 1) to 7) will be described below.

The audio signal processing unit 2 includes a D / A converter, a DS
It comprises a P, A / D converter, a transmission signal amplifier, a reception signal amplifier and the like. Also, for example, π / 4 phase-shift QPS
A modulation / demodulation circuit for modulating and demodulating a K signal, and a time division multiplex connection (TDMA, TDMA / TDD) for performing transmission / reception connection in a time slot in the time division multiplex connection.
It has a circuit, a codec (CODEC) circuit for decoding the received signal and decoding the transmitted signal, a frequency level changing circuit for changing the frequency characteristic of the received signal, and the like.
These circuits are implemented in a DSP.

The radio unit 5 receives a radio signal from a cell base station (not shown) through an antenna 6, and performs high-frequency amplification, frequency conversion, intermediate frequency (IF) amplification, and automatic gain control (AG).
C), a radio receiving unit that outputs an IF signal by processing such as, a radio transmitting unit that transmits a radio signal to a cell base station, and that performs frequency conversion and power amplification, and a reception electric field strength detection (RSSI ) Circuit and a high-speed switching synthesizer (DLPS) for determining the transmission / reception frequency.

The input operation unit 7 includes a keypad for performing power on or off, on-hook, off-hook, function selection, telephone number input operation, and the like.

The calling unit 8 includes a light emitting diode (LED) for displaying an incoming call by blinking, a ringer for making an incoming call by sound, a vibrator for notifying the incoming call by vibration, and the like.

First, the overall operation will be described. FIG.
In such a configuration, the mobile phone device executes a series of sequence from location registration based on the communication standard when the power is turned on. In this case, the radio unit 5 detects the received electric field strength, and the location is registered through the cell base station having the maximum received electric field strength under the control of the control unit 1.

When a call is made thereafter, a telephone number is further input from the input operation unit 7 after off-hook by the input operation unit 7, and this selection signal is transmitted to the cell base station via the radio unit 5 and the antenna 6. You. In this case, an exchange / control station (not shown) checks a database (subscriber file) or the like to allocate a communication channel. That is, a communication channel obtained by dividing a frame having a fixed time period at a plurality of time intervals (time slots) is allocated.

Through this communication channel, a telephone exchange connection sequence (selection signal reception, number translation, outgoing line selection link selection, calling signal transmission, response detection, communication path closing) through the exchange / control station is executed. The transmission signal from the microphone 4 by the transmission is encoded by the audio signal processing circuit 2, and the transmission signal placed in the assigned time slot is
The signal is orthogonally modulated to a modulation signal such as a π / 4 phase-shifted QPSK signal. The modulated signal is wirelessly transmitted through the radio unit 5 and the antenna 6.

The audio signal processing unit 2 orthogonally transforms (I / Q converts) various exchange signals from the exchange / control station and modulated signals from the connection destination through the antenna 6 and the radio unit 5.
Then, the audio signal is decoded and the sound is output from the speaker 8. When the control unit 1 captures the detection of the end of the call, the restoration of the call path is controlled through the switching and control station.

When a call is received by the portable telephone device, the received call signal is identified and a response signal is transmitted. The switching / control station determines a cell base station to be connected to the radio channel, and further allocates a communication channel to perform the call. Subsequent operations are the same as at the time of calling.

Next, the operation of the portable telephone device of the first embodiment shown in FIG. 1 will be described in detail. FIG. 2 is a flowchart showing a processing procedure of the operation of the mobile phone device of the first embodiment during a call.

In FIG. 1 and FIG. 2, first, step S
In step 1, during a call that performs the above operation,
One of the two modes, that is, the indoor mode or the outdoor busy mode, is selected according to the place (or environment) during the call, and the change is performed based on the frequency characteristics of the reception signal in the selected mode.

In this case, the indoor mode is a state where there is no noise around, and the outdoor busy mode is a state where there is noise around. The frequency characteristics of the reception signal corresponding to each mode are set in advance. The setting of the mode lowers or increases the level of the high frequency band 1.5 kHz to 3.4 kHz (high band) and the low frequency band band 300 Hz to 700 Hz (low band) in the transmission voice communication band 300 Hz to 3.4 kHz. Make settings to make For example, a decrease / increase in the level of the high frequency or the low frequency decreases the level of the low frequency in the outdoor crowd mode, and further reduces the level of the high frequency in the outdoor crowd mode in order to make it easier to hear the received content with respect to the surrounding noise. It is set as it is or raised. In the indoor mode, for example, a flat setting without lowering / raising the level of the high frequency or the low frequency, or a setting of increasing the level of the low frequency is used. In this embodiment, there are two modes, but the present invention is not limited to this. Although the frequency characteristics of the reception signal in this mode are set in advance, it is also possible for the user to set the frequency characteristics based on his / her preference.

Next, the portable telephone device detects at least one of the received electric field strength and the telephone number of the other party of the call (step S2). Then, in step S3, step S1
It is determined whether there is a set value based on the received electric field strength / telephone number of the mode selected in. If there is a set value, the set value is changed to the set value of the received sound quality (frequency characteristic of the received signal) (step S4).
The frequency characteristics of the initial value as they are, that is, the frequency characteristics of the selected mode.

As described above, in the portable telephone device according to the present embodiment, the memory of the control unit 1 has the initial set value for each mode, and the user adjusts the level with respect to the initial set value according to his / her preference and the like. And optionally the user stores this value for each received field strength or telephone number. This makes it possible to omit the operation of changing the receiving sound quality every time a call is made by reading out the set value stored in the memory when the call is made again with the same received electric field strength / telephone number. In addition, the unpleasant noise sound peculiar to digital processing such as a weak reception electric field strength area is softened, and a received sound quality that is easy to hear is obtained.

Next, after selecting the frequency characteristic of the received signal based on the mode and the received electric field strength / telephone number, the selected received sound quality is changed (setting of the level reduction / increase in high or low frequency). It is determined whether there is (Step S5).
If there is no change, the process proceeds to step S7, and if there is a change, the level of the frequency characteristic of the received signal is changed in step S6.

In step S6, the audio signal processing unit 2
When the change setting of the frequency characteristic of the received signal in (1) is a high-frequency level change (decrease / increase), the control unit 1 changes the frequency band level in the DSP of the audio signal processing unit 2 to change the high-frequency level in the received sound quality. Setting control to change the level for

Similarly, when the setting for changing the reception sound quality in the audio signal processing unit 2 is a change in the low-frequency level (decrease / increase), the control unit 1 similarly controls the frequency band level in the DSP of the audio signal processing unit 2. Is changed to change the level of the received sound quality for the low frequency range. The setting of the reception sound quality (frequency characteristics of the reception signal) is performed by the user from the input operation unit 7 in the memory (not shown) of the control unit 1, and as described above, the reception sound quality of the individual user is set. Is changed according to the preference of the user. For example, similarly to a graphic equalizer in an audio device, a decrease or an increase in the level of a high frequency or a low frequency (hereinafter referred to as a decrease / increase).
Will be set. With graphic equalizer,
In some cases, the level of the intermediate frequency (middle frequency) is lowered / increased, but in this case, the target is the reduction / increase of only the high frequency or low frequency level.

Then, in step S7, the reception signal is output as sound from the speaker 3. After that, when the control unit 1 receives the end signal and determines the end of the call (step S8), the voice signal processing unit 2 changes the received sound quality (set value) according to the user's judgment. ) Is stored in a memory (not shown) of the control unit 1 (step S).
9). As described above, the stored received sound quality change settings can be used, for example, at the next incoming call. If the call is not ended in step S8, the process returns to step S5, and the received sound quality is changed. Finally, at the end of the call, it is set so as to return to the initial value of the frequency characteristic of the received signal.

In the first embodiment, for each call, the user determines the noise state around the user, and operates the input operation unit 1 to select the indoor mode or the outdoor busy mode, thereby obtaining the received sound quality. However, the indoor mode or the outdoor busy mode can be automatically set.

Although the detection of the reception field strength / telephone number is performed after the mode is selected, the mode may be selected after the detection of the reception field strength / telephone number. As a result, it suffices if the frequency characteristics of the received signal relating to the received electric field number / telephone number based on the mode stored in the memory of the control unit 1 can be known.

Further, in the first embodiment, the setting for changing the reception sound quality is performed by the DSP of the audio signal processing unit 2 in FIG. 1, but the other configurations operate in the same manner.
For example, a hardware configuration in which LPF, HPF, and BPF that limit the pass band are used, and the selection is performed under the control of the controller 1 may be used. The configuration using the LPF, HPF, and BPF may be processing by digital filtering. Alternatively, a hardware configuration may be used in which a variable frequency amplifier is used and the frequency characteristics thereof are changed and set, for example, the CR constant is switched to change the received sound quality.

As described above, in the first embodiment, the received sound quality (frequency characteristic of the received signal) is changed and set in the indoor mode or the outdoor busy mode based on the surrounding noise generation state and the like. It can be changed and set according to your preference. As a result, it becomes possible to change and set the frequency characteristic of the reception signal in the mobile phone device or the like, and to change and set the reception sound quality according to the communication environment and personal listening preference.

Further, the frequency characteristic of the received signal for each telephone number of the other party of the call is stored in advance in the memory of the control unit, and the frequency characteristic of the received signal corresponding to the telephone number of the other party is automatically selected during the call. It is possible to omit the operation of changing and setting the receiving sound quality for each call.

Further, the frequency characteristics of the received signal for each received electric field strength can be stored in the memory of the control unit in advance, and the frequency characteristics of the received signal corresponding to the received electric field strength can be automatically selected during a call. In addition, the operation of changing and setting the receiving sound quality for each call can be omitted. Also, in particular,
In areas where the received electric field strength is weak, a noise sound unique to digitization is softened, and a received voice that is easy to hear can be obtained.

Further, at the end of the call, the setting can be made so as to return to the initial value of the frequency characteristic of the received signal, so that the setting operation for returning to the initial value becomes unnecessary.

[Second Embodiment] FIG. 3 is a block diagram showing a configuration of a portable telephone device according to a second embodiment of the present invention. 3, the configuration of the second embodiment is the same as that of the first embodiment shown in FIG. 1, except that the control unit 11, the audio signal processing unit 12, the speaker (receiver) 13, the microphone 14, the radio unit 15, an antenna 16, an input operation unit 17, and a calling unit 18. Further, a liquid crystal display (LCD) corresponding to the display means for displaying on the screen the reception status, the transmission / reception telephone number, and the display related to various processes corresponding to the second embodiment, in particular, the frequency characteristic of the reception sound quality.
19 are provided.

Next, the operation of the portable telephone device according to the second embodiment shown in FIG. 3 will be described in detail. FIG. 4 is a flowchart showing a processing procedure of an operation at the time of a telephone call of the mobile phone device of the second embodiment. The processing procedure of the second embodiment is different from the processing procedure of the first embodiment shown in FIG. 2 in that the received sound quality (received signal frequency characteristic) is displayed on the LCD 19, and the weight of the received signal frequency characteristic is further weighted. Processing has been added. In FIG. 4, the description of the same processing operation as in FIG. 2 is omitted.

In FIG. 3 and FIG. 4, first, the cellular phone device selects an indoor mode or an outdoor busy mode according to the surrounding environment during a call (step S11). With this selection, it is possible to set sound quality that is easy for the user to hear according to the environment. Thereafter, at least one of the received electric field strength and the telephone number of the other party is detected (step S).
12) Then, the reception sound quality is set based on the reception electric field strength / phone number detected in the mode selected in step S11 (step S14). If there is no set value based on the detected received electric field strength / telephone number (step S13), the received voice quality of the initial value set based on the selected mode remains.

Next, after selecting the frequency characteristic of the received signal based on the mode and the received electric field strength / telephone number, the control unit 11 changes the received sound quality by the user (decrease / increase of the level in the high or low frequency range). Is determined (step S15). If there is no change in the received voice quality, the process proceeds to step S17, and the frequency characteristic of the received signal is displayed on the LCD 19 on a screen.

If there is a change in the received voice quality in step S15, the audio signal processing unit 12 performs frequency level change weighting of the received signal (step S16).
When weighting the high frequency level in step S16, the control section 11 controls the high frequency level to be increased and the low frequency level to be reduced accordingly. Similarly, when the high frequency level is lowered, the low frequency level is controlled to increase accordingly. Then, the frequency characteristic of the received signal weighted at the high frequency level is displayed on the LCD 19 (step S17).

When weighting the low-frequency level in the audio signal processing section 12, the control section 11 controls so that when the low-frequency level is raised, the high-frequency level is reduced accordingly. Also, when lowering the low-frequency level, control is similarly performed to increase the high-frequency level accordingly. Then, the frequency characteristics of the received signal weighted at the low frequency level are displayed on the LCD 19 (step S1).
7).

Steps S16 and S1
In 7, the weight is displayed on the LCD at the time of the weighting, and the user can set the weighting while looking at the LCD screen. The setting of the weighting is automatically performed according to the user's setting for changing the reception sound quality.

Thereafter, in step S 18, the reception signal is output as sound from the speaker 13. Then, the control section 11 captures the end signal to determine the end of the call (Step S).
19) Then, the setting contents for the received sound quality in the audio signal processing unit 12 are stored in the memory (not shown) of the control unit 11 (step S20). If the call has not ended in step S19, the process returns to step S15, and the received sound quality is changed. In addition, at the end of the call, it is set so as to automatically return to the initial value of the frequency characteristic of the received signal.

As described above, in the second embodiment, by weighting the frequency characteristics of the received signal, it is possible to prevent the received sound volume from changing (decreasing) when the received sound quality is changed. Become.

FIG. 5 is a frequency characteristic diagram for explaining the weighting in the frequency characteristic of the received signal according to the second embodiment. FIG. 5A is an explanatory diagram for explaining the high frequency weighting. (B) is an explanatory diagram for explaining weighting of low frequencies. In the figure, the solid line shows the frequency characteristic before the change (before performing weighting), and the dotted line shows the frequency characteristic after the change.

In the weighting of the high frequency level, the low frequency level is also changed in accordance with the change setting of the high frequency level in the received sound quality. That is, in FIG. 5 (a), when the high frequency level is increased, the low frequency level is reduced accordingly,
The overall volume is kept constant. FIG.
The weighting of the high frequency level shown in (a) is the same as the case of lowering the low frequency level and increasing the high frequency level accordingly in the low frequency level weighting.

In the low-frequency level weighting, the high-frequency level is also changed in accordance with the change setting of the low-frequency level in the received sound quality. That is, in FIG. 5B, when the low-frequency level is raised, the high-frequency level is raised accordingly, and the overall sound volume is made constant. The weighting of the low frequency level shown in FIG. 5B is the same as the case where the high frequency level is lowered and the low frequency level is raised accordingly in the high frequency level weighting.

As described above, by weighting the reception signal, it is possible to prevent the reception sound volume from changing (decreasing) so much when the reception sound quality is changed and set.

In the second embodiment, as described above with reference to FIG. 4, the frequency characteristics of the reception signal changed and set by the weighting can be visually and easily confirmed on the LCD.

FIG. 6 is a frequency characteristic diagram for explaining the screen display state of the frequency characteristic (received sound quality) of the received signal on the LCD 19 according to the second embodiment. The screen of the LCD 19 shows the frequency characteristics of a received signal in which the low-frequency level in the transmission voice communication band of 300 Hz to 3.4 kHz is sequentially reduced (gradually reduced) and the high-frequency level remains flat. In the screen display shown in FIG. 6A, the frequency vs. level is displayed on the screen using a continuous line using a line graph. In the screen of the LCD 19 shown in FIG. 6B, the same frequency versus level as that of FIG. 6A is displayed using a bar graph. The screen display on the LCD 19 by the line graph or the bar graph is performed by executing the control of the control unit 11 according to an instruction from the input operation unit 17.

As described above, the frequency characteristic of the reception signal changed and set by the LCD display is displayed on the screen in real time using a line graph, a bar graph, or the like, so that it can be easily visually confirmed. In the above description, the frequency characteristic of the reception signal changed and set is described as being displayed on the LCD, but the frequency characteristic of the reception signal before the change setting is also displayed on the LCD so that the change result can be easily visually confirmed. it can.

As described above, in the second embodiment, by changing and setting the reception sound quality (reception signal frequency characteristic), the frequency characteristic of the reception signal in the portable telephone device can be changed and set, and the communication environment and the reception sound quality can be changed. Can be changed and set according to personal listening preferences. Furthermore, weighting can be performed without changing the received sound volume, so that unpleasant noise sound can be softened to obtain a received sound quality that is easy to hear. Become.

In the first and second embodiments, the user can arbitrarily set the level of the frequency characteristic of the received signal in the portable telephone device. However, in this setting, in order to obtain good received voice quality, the frequency characteristics (received voice quality) of the received signal must be within the level range of the transmission voice quality standard, for example, the transmission voice bandwidth 300 Hz to 3.4 kHz.
Must be set in zd.

FIG. 7 is a frequency characteristic diagram for explaining the level range of the transmission call quality standard in the telephone call according to the second embodiment. Is displayed on the LCD 19 on the screen. In the second embodiment, as shown in FIG. 7, the user sets the level (solid line) of the received signal between the upper limit (dotted line a) and the lower limit (dotted line b), that is, the level range of the transmission call quality standard. While watching, the receiving signal can be set. Also,
Even if the change setting operation is performed out of the range, the control unit performs control so that the level does not change beyond the upper limit or the lower limit. As a result, it is possible to prevent the setting from being changed to a level outside the range between the upper limit and the lower limit. That is, it is possible to obtain a received sound quality characteristic within the communication standard range when the received sound quality is changed and set.

Although the frequency characteristic of the received signal is displayed on the LCD 19 of the portable telephone device, it can be displayed on another display device. For example, a portable data terminal (notebook-type small general-purpose computer) can be interfaced to the portable telephone device, and the LCD / CRT display unit of the portable data terminal can display a screen of the frequency characteristic of the received signal.

It is also possible to provide a sound notifying the screen display but not exceeding the upper limit or the lower limit. In this case, no display device is required.

In the first and second embodiments, the TDM
Although the description has been made using the A method and the TDMA / TDD method, the present invention is not limited to this. Other wideband CDMA systems and T
The same can be applied to the CDMA system of the IA / IS-95A standard and the like.

[0082]

As is apparent from the above description, according to the present invention, it is possible to change and set the reception sound quality (frequency characteristics of the reception signal) in the portable telephone device, and to set the communication environment and personal preference of the reception voice. It is possible to provide a mobile phone device and a method of setting and changing a frequency characteristic of a received signal that can respond to the above.

Further, according to the present invention, at the time of a call, the frequency characteristics of the received signal corresponding to the received electric field strength / telephone number stored in advance are automatically selected and changed, so that the received sound quality of each call is changed. You can skip the operation of changing the settings.

Further, according to the present invention, the change setting for automatically returning to the initial value of the received signal frequency characteristic at the end of the call is performed, and the operation of returning the previous received sound quality setting to the initial value every time a call is made is omitted. You.

Also, according to the present invention, the overall volume is made constant by weighting the level increase / decrease of the high / low range so that the received volume does not change when the received sound quality is changed and set.

Further, according to the present invention, the received signal frequency characteristics are displayed on a screen display screen using a line graph or a bar graph, so that the received sound quality can be visually confirmed.

Further, according to the present invention, the reception signal frequency characteristic is changed and set within the level range of the predetermined transmission communication quality standard, and when the reception sound quality is changed and set, the reception sound quality characteristic within the communication standard range is set. Thus, even if the frequency characteristic of the received signal is changed and set, the change setting can be prevented from being performed outside the level range of the transmission call quality standard stored in advance.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a mobile phone device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing procedure of an operation of the mobile phone device according to the first embodiment during a call;

FIG. 3 is a block diagram illustrating a configuration of a mobile phone device according to a second embodiment of the present invention.

FIG. 4 is a flowchart illustrating a processing procedure of an operation during a call of the mobile phone device according to the second embodiment.

FIG. 5 is a frequency characteristic diagram for describing weighting in frequency characteristics of a received signal according to the second embodiment.

FIG. 6 is a frequency characteristic diagram for explaining a screen display state of a frequency characteristic of a received signal according to the second embodiment.

FIG. 7 is a frequency characteristic diagram for explaining a level range of a transmission call quality standard in a telephone call according to the second embodiment.

FIG. 8 is a block diagram showing one configuration of a conventional noise prevention device.

[Explanation of symbols]

 1,11 control unit 2,12 audio signal processing unit 2a, 12a D / A converter (DAC) 3,13 speaker (receiver) 4,14 microphone 5,15 radio unit 6,16 antenna 7,17 input operation unit 8 , 18 Caller 9 Liquid Crystal Display (LCD)

Claims (17)

[Claims] 1. A setting input means for arbitrarily setting an increase or decrease of a level in a frequency band of a reception signal, and changing and setting a frequency characteristic of the reception signal for each communication based on the increase or decrease of the level by the setting input means. A mobile phone device comprising: a control unit configured to perform the control so as to generate the reception signal having the frequency characteristic based on the control of the control unit; 2. The audio output processing means includes frequency level conversion means having at least one of a filter by analog or digital processing and a variable frequency amplifier, and the control means controls the frequency level conversion means to reduce a level of the signal. 2. The mobile phone device according to claim 1, wherein the number is increased or decreased. 3. The portable telephone device according to claim 1, wherein said control means includes storage means for storing frequency characteristics set by said setting input means. 4. The storage means stores frequency characteristics of a plurality of reception signals set in advance corresponding to an environment at the time of communication. 4. The portable telephone device according to claim 3, wherein control is performed so as to change and set the frequency characteristic of the stored reception signal. 5. The storage means stores a received electric field strength and a frequency characteristic of a received signal corresponding to at least one of a telephone number of the other party, and the control means stores the detected received electric field strength and the other party's telephone number during communication. 5. The portable telephone device according to claim 3, wherein control is performed so as to change and set the frequency characteristic of the received call signal stored in advance corresponding to at least one of the telephone numbers of the mobile phone. 6. The control device according to claim 1, wherein the control means controls the weight of at least one of the high frequency range and the low frequency range so as to make the overall volume constant.
6. The mobile phone device according to claim 4 or 5. 7. The mobile phone according to claim 1, wherein said control means controls to change and set a frequency characteristic of a received signal within a level range of a predetermined transmission call quality standard. apparatus. 8. The mobile phone device according to claim 1, further comprising a display unit for displaying a frequency characteristic of the reception signal on a screen. 9. The portable telephone device according to claim 1, wherein said control means performs a change setting to return to a frequency characteristic of an initial reception signal at the end of the call. 10. A setting input step of arbitrarily setting an increase or decrease in a level of a reception signal in a frequency band, and changing and setting a frequency characteristic of the reception signal for each communication based on the increase or decrease in the level of the reception signal. A control step of controlling; and a voice output processing step of generating a voice signal of the controlled frequency characteristic and outputting the voice as a voice, a method of changing the frequency characteristic of the received signal. 11. The control step includes a storing step of storing a frequency characteristic of the reception signal set in the setting input step, and a reading step of reading out the stored frequency characteristic for each communication. 11. The method according to claim 10, wherein the control is performed so as to change the setting based on the set frequency characteristic. 12. The method according to claim 11, wherein said storing step stores frequency characteristics of a plurality of reception signals set in advance corresponding to an environment at the time of communication. . 13. The receiving signal frequency characteristic according to claim 11, wherein said storing step stores a frequency characteristic of a receiving signal corresponding to at least one of a receiving electric field strength and a telephone number of a destination. Change setting method. 14. The control method according to claim 10, wherein the control step controls the weighting of at least one of a high frequency range and a low frequency range so as to stabilize the overall volume. How to change the reception signal frequency characteristics. 15. The control step, when changing and setting the frequency characteristic of the received signal, controlling to change the frequency characteristic of the received signal within a level range of a predetermined transmission call quality standard. 15. The method according to claim 10, wherein the reception signal frequency characteristic is changed. 16. The method according to claim 10, further comprising a characteristic display step of displaying a received signal frequency characteristic on a screen for each change setting. 17. The reception signal frequency characteristic according to claim 10, further comprising an initial setting step of performing a change setting to return to an initial value of the reception signal frequency characteristic at the end of the call after the voice output processing step. Change setting method.