JP3088372U - Television receiver and audio output device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an audio output device capable of reliably viewing audio information output from a point in time when an earphone plug is inserted and connected to a point in time when an earphone receiver is attached to an ear. A speaker for outputting an audio signal from an audio processing unit, an earphone terminal for supplying an audio signal from the audio processing unit to an earphone receiving unit when an earphone plug is inserted, When an audio signal is input via the earphone terminal 8 to which the earphone plug 7 is not inserted, the audio signal supply path from the audio processing unit 3 to the speaker 4 is kept conductive, and the earphone plug 7 is connected to the earphone terminal 8. And delay switching control means for interrupting the audio signal supply path after a predetermined delay time T has elapsed since the input of the audio signal was stopped due to the insertion of the audio signal.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an audio output device mainly used for a television receiver, a radio receiver, a tape recorder, a disk reproducing player, and the like, and a television receiver provided with the audio output device.

[0002]

[Prior art]

 In general, as shown in FIG. 5, a sound output device of a television receiver includes a broadcast receiving radio 1 having a receiving antenna 1 for a television broadcast wave, a well-known tuner, an IF (intermediate frequency) amplifying unit and a detecting unit. And an audio processing unit 3 including a well-known audio demodulation unit, an audio amplification unit, an audio output unit, and the like, and a speaker 4 for outputting an audio signal of a television broadcast wave. I have. In addition, tape recorders and disk reproducing devices amplify audio signals reproduced from cassette tapes or disks and then output the amplified signals from speakers.

Further, the audio output device is provided with an earphone jack 8 which is an external connection terminal to which an earphone plug 7 is inserted and connected. When the earphone plug 7 is not inserted, the earphone jack 8 supplies an audio signal from the audio processing unit 3 to the speaker 4 via the normally closed internal contact 8a, and also, as shown by a virtual line in FIG. When the plug 7 is inserted, the external contact 8b is electrically connected to the earphone plug 7, and at the same time, the internal contact 8a is opened. The sound is output from an earphone receiver (not shown). Similarly, in a device in which headphones are connected instead of the earphones, the headphone plug is inserted into the headphone jack and connected, and at the same time, the audio signal supply path to the speaker 4 is cut off. That is, the earphone jack 8 and the headphone jack have the same configuration. Therefore, in the following description, only the earphone jack 8 will be described.

[0004]

[Problems to be solved by the invention]

 By the way, the user of the earphone generally feels that the volume level of the earphone receiver is higher than the sound output from the speaker 4 because the audio signal output from the earphone receiver directly enters the ear. Therefore, when listening to the sound using the earphone, the user first inserts the earphone plug 7 into the earphone jack 8 to prevent the sound of a large volume level from being suddenly heard from the ear. It is common practice to bring the earphone receiver into your ear after putting it close to your ear to check whether the volume level is appropriate.

However, in the conventional audio output device, as shown in FIG. 5, when the earphone plug 7 is inserted into the earphone jack 8, the audio signal path from the audio processing unit 3 to the speaker 4 is changed to the earphone jack 8. As a result, the user cannot view the audio signal from that point in time until the earphone receiver is put in his ear, and the voice of information that the user does not want to miss in a short time Often it is output. For example, when watching a television receiver, if a family member starts a telephone call on a telephone set near the television receiver, the output sound from the speaker 4 may disturb the telephone call. In many cases, the earphone plug 7 is quickly inserted into the earphone jack 8, and in such a case, the voice of the important broadcast content may be missed.

On the other hand, conventionally, apart from the above, there is a television receiver in which a hearing-impaired person and a healthy person can individually and simultaneously listen to the sound of the television receiver at an optimum volume level. It has been proposed (see JP-A-8-65070). This television receiver includes a second audio output unit for earphones and an earphone terminal connected to the second audio output unit, separately from the audio output unit for speakers. With the earphone plug connected, the audio signal can be output from the speaker at the same time.

However, in this television receiver, a switch provided between the audio output unit of the speaker and the speaker is turned on in conjunction with the operation of removing the earphone plug. In order to view the sound by using an earphone plug, the operation of inserting the earphone plug into the earphone jack and the operation of turning off the switch manually must be performed. In addition to this, not only is it inconvenient to use, but also as described above, it is not possible to shut down the sound output from the speaker immediately and view the sound with earphones.

In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and ensures that the audio information output from the time when the earphone plug is inserted and connected to the time when the earphone receiver is put on the ear is reliably output. It is an object of the present invention to provide a sound output device that can be viewed and a television receiver including the sound output device.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, a television receiver according to the invention according to claim 1 includes a broadcast receiving unit that detects a received television broadcast wave after converting the frequency, and an audio signal from the broadcast receiving unit. A sound processing unit for demodulating and then amplifying and outputting a low-frequency signal, a speaker for outputting a sound signal from the sound processing unit as a sound, and switching the sound processing unit to the earphone plug only when an earphone plug is inserted. An audio signal from the audio processing unit is transmitted through the earphone terminal, a switching circuit interposed between the audio processing unit and the speaker, and the earphone terminal with the earphone plug not inserted. The switching circuit is kept in the ON state when the signal is being input, and when the delay time elapses from the time when the audio signal is stopped being input, the It is characterized by comprising a control unit for controlling the switching off state switching circuit.

[0010] In this television receiver, when the earphone plug is inserted into the earphone terminal, no audio signal is input to the control unit, so that the control unit that determines that the earphone plug has been inserted has a delay from that point. When the time elapses, the switching circuit is switched to the off state, so that from the time the earphone plug is inserted until the delay time elapses, the audio signal is output from the earphone and the audio signal is also output from the speaker. Is output. Therefore, the user can view the audio signal from the speaker even after inserting the earphone plug and before putting the earphone receiver on the ear, so that the user does not miss important information. . After the delay time has elapsed, the audio output from the speaker is automatically cut off, so that the audio can be viewed only from the earphone.

[0011] The audio output device of the invention according to claim 2 is a speaker for outputting an audio signal from the audio processing unit, and an earphone receiving / receiving an audio signal from the audio processing unit only when an earphone plug is inserted. And an audio signal supply path from the audio processing unit to the speaker when an audio signal is input via the earphone terminal to be supplied to the unit and the earphone terminal where the earphone plug is not inserted. And delay switching control means for shutting off the audio signal supply path after a predetermined delay time has elapsed since the earphone plug was inserted into the earphone terminal and the input of the audio signal was stopped. It is characterized by having.

[0012] According to this audio output device, the delay switching control means keeps the audio signal supply path from the audio processing unit to the speaker conductive until the delay time elapses after the earphone plug is inserted. Therefore, the audio signal is output from the earphone and the audio signal is also output from the speaker, and the user can output the audio signal even after the earphone plug is inserted until the earphone receiver is put on the ear. Can be viewed from the speaker, so that users do not miss important information. After the delay time has elapsed, audio output from the speaker is automatically cut off, so that audio can be viewed only from the earphone.

According to a third aspect of the present invention, there is provided an audio output device, wherein the delay switching control means of the second aspect comprises a switching circuit interposed and connected between the audio processing unit and the speaker. A delay timer circuit for measuring a delay time, the switching circuit being kept on when an audio signal is being input via the earphone terminal, and the delay being stopped when the audio signal is no longer input. And a control unit for activating the timer circuit and turning off the switching circuit when the delay timer circuit finishes measuring the delay time.

According to this configuration, since the delay switching control means measures the delay time by the delay timer circuit, the delay time can be arbitrarily changed and can be accurately measured, and after the earphone is connected, the speaker is connected to the speaker. There is no problem that the time during which the audio signal is output from is too short or longer than necessary. In addition, the audio signal supply path from the audio processing unit to the speaker can be reliably connected and disconnected by the switching circuit.

Further, in the audio output device according to the present invention, as the control unit according to the third aspect, a detection port to which an audio signal is input via the earphone terminal and a switching circuit are provided. On the other hand, a microcomputer having a control port for outputting a switching command signal is used.

According to this configuration, since the delay switching control means is configured to be controlled by the microcomputer, the control for outputting the audio signal from the speaker for a certain period of time after the earphone plug is inserted can be accurately performed. It can be carried out.

The sound output device according to the invention according to claim 5 is a delay switching control means according to the invention according to claim 2, wherein a predetermined delay time from the time when the input of the sound signal to the excitation coil unit is stopped. After the lapse of time, the magnetic force disappears and the power relay that turns off the contact part connected to the audio signal supply path, or the switching element inserted and connected to the audio signal supply path, the capacitor charged by the audio signal, And a resistor constituting a discharge circuit for discharging the charge of the capacitor when the input of the audio signal is stopped, and for a delay time set by the time constant of the capacitor and the resistor when the input of the audio signal is stopped, Any one of the delay switching circuits configured to hold the switching element in an on state is used.

According to this configuration, the control and switching control means can be configured to be extremely simplified, so that the cost can be reduced.

[0019]

[Embodiment of the invention]

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional block diagram of a main part of a television receiver provided with an audio output device according to an embodiment of the present invention. 5, the same or equivalent components as those in FIG. 5 are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 3A shows the state when the earphone is not connected, and FIG. 3B shows the state when the earphone is connected.

In the above-described audio output device, when the earphone is not connected as shown in (a), the audio signal from the audio processing unit 3 is controlled by a micro computer through the normally closed internal contact 8 a of the earphone jack 8. The signal is input to the detection port P1 of the unit 9, and is output from the speaker 4 via the normally closed switching circuit 10. The control unit 9 controls the entire audio output device by executing a program stored in the ROM based on the data stored in the built-in RAM. That is, as shown in (b), when the earphone plug 7 is inserted into the earphone jack 8 and electrically connected as shown in (b), the control unit 9 connects the earphone based on the fact that no audio signal is input to the detection port P1. Is determined, the delay timer circuit 11 is started, and the time data of the delay timer circuit 11 is taken in to determine whether or not a preset delay time has elapsed, and it is determined that the delay time has elapsed. At this point, a switching command signal is output from the control port P2 to instruct the switching circuit 10 to turn off.

Next, control processing by the control unit 9 will be described with reference to a timing chart of FIG. 2 and a flowchart of FIG. In FIG. 3, the control unit 9 constantly monitors whether or not the earphone plug 7 is inserted and connected to the earphone jack 8 based on the presence or absence of an audio signal to the detection port P1 (step S1). The control unit 9 does not output the switching command signal from the control port P1 as long as the earphone plug 7 is not connected. Therefore, as shown in FIG. 1A, the switching circuit 10 keeps the normally closed state, so that the audio signal from the audio processing unit 3 is output from the speaker 4 via the switching circuit 10.

As shown in FIG. 2A, when the earphone plug 7 is inserted into the earphone jack 8 and connected at t1 as shown in FIG. 1B, the earphone jack 8 is It is electrically connected to the earphone plug 7 via the contact 8b, and the audio signal from the audio processing unit 3 is immediately output from the earphone receiving unit (not shown). At this time, the user puts the earphone receiver close to the ear, checks whether the volume level of the output sound is appropriate, and then puts it on the ear. The time required from when the earphone plug 7 is inserted into the earphone jack 8 to when the earphone receiver is completely attached to the ear is generally about 5 seconds.

On the other hand, at time t1, the internal contact 8a of the earphone jack 8 is opened, and the earphone plug 7 is turned off when the audio signal is no longer input to the detection port P1 as shown in FIG. Is determined (step S1), a command is issued to the delay timer circuit 11 to start the operation of measuring a preset delay time (step S2), and the delay timer circuit 11 is fetched from the delay timer circuit 11. It is determined whether or not a preset delay time has elapsed based on the timekeeping data (step S3). The delay time T (FIG. 2B) is set to 5 seconds in this embodiment for the above-described reason, but the delay time T can be arbitrarily changed.

When the control unit 9 determines that the delay time T has elapsed at t2 based on the time measurement data of the delay timer circuit 11, the control unit 9 performs switching from the control port P2 as shown in FIG. A switching command signal is output to the circuit 10 to turn off the switching circuit 10 (step S4), and at the same time, reset the delay timer circuit 11 (step S5). Thus, from the time t1 when the earphone plug 7 is inserted to the time t2 when the delay time T of 5 seconds elapses, an audio signal is output from the earphone and an audio signal is output from the speaker 4 as well. ing. Therefore, since the user can view the audio signal from the speaker 4 even after the earphone plug 7 is inserted and before the earphone receiver is put on the ear, the user may miss important information contents. Does not occur. After the delay time T has elapsed, the sound output from the speaker 4 is automatically cut off, so that the sound can be viewed only from the earphone. Therefore, in this audio output device, the control unit 9, the delay timer circuit 11, and the switching circuit 10 constitute a delay switching control unit.

After that, the control section 9 continues to monitor whether the earphone plug 7 has been removed from the earphone jack 8 (step S6) and whether the power has been turned off (step S7). If the power is turned off without removing the earphone plug 7, the series of control processing is terminated.

On the other hand, when the user removes the earphone plug 7 at time t3 in FIG. 2, the control unit 9 causes the audio signal to be input again to the detection port P1, as shown in FIG. It is determined that the earphone plug 7 has been removed (step S6), and the output of the switching command signal to the switching circuit 10 is stopped as shown in FIG. 2 (b). At step S8. Thus, the audio signal is immediately output from the speaker 4 at t3. After that, the control unit 9 returns to step S1, and repeats the same control processing as described above until it is determined that the power is turned off (step S7).

FIG. 4 is a functional block diagram showing a main part of a television receiver provided with an audio output device according to another embodiment of the present invention. Are denoted by the same reference numerals, and redundant description will be omitted. This embodiment aims at obtaining the same effect as that of the embodiment without using the control unit 9 and the delay timer circuit 11 composed of the microcomputer of the embodiment.

In this audio output device, when the earphone plug 7 is not inserted into the earphone jack 8, the audio signal from the audio processing unit 3 is supplied to the speaker 4 via the contact 12 a of the power relay 12, The audio signal is also supplied to the excitation coil section 12b of the power relay via the internal contact 8a of the earphone jack 8. The switching of the power relay 12 is controlled by the presence or absence of an audio signal supplied to the excitation coil unit 12b via the earphone jack 8.

That is, when the earphone plug 7 is not connected to the earphone jack 8, the audio signal is constantly supplied to the exciting coil 12 b via the internal contact 8 a of the earphone jack 8, and the contact 12 The closed state is maintained by the magnetic force generated in the exciting coil portion 12b. Therefore, the audio signal from the audio processing unit 3 is continuously output from the speaker 4 via the contact point 12a.

When the earphone plug 7 is inserted into the earphone jack 8, the audio signal from the audio processing unit 3 is output from the earphone receiving unit via the external contact 8 b of the earphone jack 8 at that point. At the same time, the internal contact 8a of the earphone jack 8 is opened by the earphone plug 7, so that no audio signal is supplied to the exciting coil 12b. At this time, the generated magnetic force of the exciting coil unit 12 does not immediately become zero when the audio signal stops flowing, but gradually decreases. Therefore, the contact portion 12a is kept on by the action of the residual magnetic force of the exciting coil portion 12b until a certain time elapses from the time when the audio signal stops flowing, and the time when the magnetic force disappears. To turn off.

Since the time during which the residual magnetic force of the exciting coil portion 12b acts can be set to about 5 seconds, even in this sound generating apparatus, the time from about 5 seconds after the earphone plug 7 is inserted can be set. In addition, an audio signal can be output from the speaker 4 via the contact portion 12a that keeps the ON state, and when the earphone plug 7 is removed, the audio signal immediately flows to the exciting coil portion 12b. The switching is automatically performed so that the contact portion 12a is turned on and the audio signal is output from the speaker 4. Therefore, in this audio output device, the delay switching control means has a simplified configuration using only the power relay 12.

In the above embodiment, the case where the delay switching control means is constituted by the power relay 12 has been described as an example. However, the delay switching control means is not limited to the power relay 12 and the audio signal stops flowing. Any configuration may be used as long as the switching operation is performed to the off state after a certain delay time has elapsed from the time. For example, the delay switching control means discharges the charge of the capacitor via a resistor when the audio signal stops flowing, and waits until the delay time set by the time constant of the capacitor and the resistor elapses. Alternatively, a configuration may be adopted in which a switching element such as a thyristor that supplies an audio signal to the speaker 4 is kept on.

In each of the above embodiments, the audio output device having a configuration in which an earphone plug is inserted into an earphone jack is described. However, even in the audio output device having a configuration in which a headphone plug is inserted into a headphone jack, It goes without saying that the same configuration as above can be applied as it is. In each of the above embodiments, the case where the television receiver is provided is described. However, the audio signal is output from the speaker, and the audio signal is output from the earphone instead of the speaker only when the earphone is inserted. The present invention can also be applied to devices for input, for example, radio receivers, tape recorders, and disc playback devices.

[0034]

[Effect of the invention]

 As described above, according to the audio output device of the present invention and the television receiver having the same, the delay switching control means is controlled by the audio processing unit until the delay time elapses after the earphone plug is inserted. Since the audio signal supply path from the speaker to the speaker is maintained in a conducting state, the audio signal is output from the earphone and the audio signal is output from the speaker, and the user inserts the earphone plug to insert the earphone plug. Since the audio signal can be viewed from the speaker even before the earphone receiver is put on the ear, the user does not miss important information. After the delay time has elapsed, audio output from the speaker is automatically cut off, so that audio can be viewed only from the earphone.

[Brief description of the drawings]

FIG. 1 shows a television receiver provided with an audio output device according to an embodiment of the present invention, wherein (a) and (b) are functional blocks of main parts in an earphone unconnected state and an earphone connected state, respectively. is there.

FIG. 2 is a timing chart of the embodiment.

FIG. 3 is a flowchart showing a control process by a control unit according to the embodiment.

FIG. 4 is a functional block diagram showing a main part of a television receiver including an audio output device according to another embodiment of the present invention.

FIG. 5 is a functional block diagram showing a conventional audio output device of a television receiver.

[Explanation of symbols]

 2 Broadcast receiving unit 3 Audio processing unit 4 Speaker 7 Earphone plug 8 Earphone jack (Earphone terminal) 9 Control unit 10 Switching circuit 11 Delay timer circuit 12 Power relay 12a Contact unit 12b Exciting coil unit P1 Detection port P2 Control port T Delay time

Claims (5)

[Utility model registration claims] 1. A broadcast receiving unit for detecting a frequency of a received television broadcast wave after converting it, an audio processing unit for demodulating an audio signal from the broadcast receiving unit, amplifying the signal at a low frequency, and outputting the demodulated signal. A speaker for outputting a sound signal from the processing unit as a sound, an earphone terminal for switching and connecting the sound processing unit to the earphone plug only when the earphone plug is inserted, and a speaker between the sound processing unit and the speaker. A switching circuit that is inserted and connected, and that when the audio signal is being input from the audio processing unit via the earphone terminal where the earphone plug is not inserted, the switching circuit is kept in an on state, and the audio signal And a control unit that controls to switch the switching circuit to an off state when a delay time has elapsed from the time when the input is stopped. Television receiver, characterized in that there. 2. A speaker for outputting an audio signal from an audio processing unit, an earphone terminal for supplying an audio signal from the audio processing unit to an earphone receiving unit only when an earphone plug is inserted, and the earphone plug includes: When an audio signal is input through the uninserted earphone terminal, the audio signal supply path from the audio processing unit to the speaker is kept conductive and the earphone plug is inserted into the earphone terminal. An audio output device comprising: delay switching control means for interrupting the audio signal supply path after a predetermined delay time has elapsed from the time when the input of the audio signal is stopped. 3. The delay switching control means according to claim 2, wherein the delay switching control means comprises: a switching circuit interposed and connected between the audio processing unit and the speaker; a delay timer circuit for measuring a delay time; When the audio signal is being input through the terminal, the switching circuit is kept in the ON state, and when the audio signal is no longer input, the delay timer circuit is activated, and the delay timer circuit operates to delay the delay time. An audio output device comprising: a control unit that turns off the switching circuit when the time measurement is completed. 4. The microcomputer according to claim 3, wherein the control unit has a detection port to which an audio signal is input via the earphone terminal, and a control port to output a switching command signal to a switching circuit. Audio output device. 5. The delay switching control means according to claim 2, wherein the magnetic force disappears after a lapse of a predetermined delay time from the time when the input of the audio signal to the excitation coil unit is stopped, and the delay switching control means is inserted and connected to the audio signal supply path. A power relay whose contact portion is turned off, or a switching element interposed in the audio signal supply path, a capacitor charged by the audio signal, and discharge of the charge of the capacitor when the input of the audio signal is stopped. A delay switching circuit comprising: a resistor constituting a circuit; and a delay switching circuit configured to hold the switching element in an on state during a delay time set by a time constant of the capacitor and the resistor when input of an audio signal is stopped. An audio output device that is one of: