KR20000031394A - Tv receiver combining fm radio - Google Patents

Abstract

PURPOSE: A receiver is provided to commonly select and to detect each signal in one tuner and one detecting circuit for different kinds of bands and double kinds of broadcasting signals. CONSTITUTION: A TV receiver combining an FM radio comprises of: a tuner; a switching unit(202) to control an operation of a mixed circuit(205) and of a generating circuit of pseudo image mmiddle frequency signal(204); a microcomputer(203) to control a selection of the tuner(201); the generating circuit of pseudo image mmiddle frequency signal(204) to generate a mmiddle frequency signal of pseudo image in a receiving mode of FM radio; the mixed circuit(205) to output by mixing the mmiddle frequency signal of pseudo image with a mmiddle frequency signal of FM radio of the tuner(201) in the receiving mode of FM radio; and a detecting circuit of image and FM sound(206) to detect a mmiddle frequency signal of FM radio sound. The microcomputer(203) is equipped a memorizing unit of TV selecting data (203a) stored controlling data of selection for a selection of TV channel, and a memorizing unit of FM radio selecting data (203b) stored controlling data of selection for a selection of FM radio as a control device. A constitution of circuit is simplified by sharing the tuner of TV and the detecting circuit of TV as the circuit for selecting and detecting the FM radio, and the design of hardware and the convenience of operation of the TV receiver as the FM radio are secured by controlling both the TV and the FM radio for one tuner in the microcomputer.

Description

FM radio combined TV receiver

The present invention uses a tuner for tuning a TV broadcast signal and a TV detection circuit for detecting the tuned TV broadcast signals (video and audio signals) in a TV receiver that also uses FM radio. In addition, the present invention relates to an FM radio and TV receiver capable of detecting a tuned FM audio signal.

Furthermore, the present invention provides a plurality of different bands in which a signal of the first frequency band and a frequency signal of the second band are tuned by one tuning means, and the detected signals can be detected by one detection means. An apparatus capable of receiving a broadcast signal, the signal of the first frequency band may be a TV broadcast signal and the signal of the second frequency band may be an FM radio broadcast signal.

Conventionally, an apparatus capable of receiving broadcast signals of different frequency bands includes a tuner as a respective tuning means corresponding to each band, and a detection circuit for detecting a signal tuned by each tuner for each band. A broadcast signal of a band can be received.

For example, in the case of a TV receiver with an FM radio, the TV-side tuner and detector circuit and the FM radio-side tuner and detector circuit are separately configured, and in the case of a TV receiver capable of receiving both UHF and VHF, the UHF tuner and the VHF A tuner and respective detection circuits are provided.

Alternatively, the case where both the tuner and the detection circuit are shared may be implemented only when the reception band is different and each broadcast signal is the same.

For example, in case of FM radio broadcasting, there is a wideband tuner that can cover all the broadcasting bands that differ from country to country. In this case, the FM circuit can be shared by the broadband circuit only if the FM broadcasting system is the same.

However, in the case of the FM / AM combined radio receiver capable of receiving both FM and AM, it is impossible to share the tuner and the detection circuit because it is a heterogeneous broadcasting method.

Fig. 1 shows a tuner and a detection stage of an FM radio and TV receiver according to the related art.

There is a TV tuner 101 and a TV image / FM audio detection circuit 102 for tuning and detecting TV broadcasts, and a radio tuner 103 and a radio FM detection circuit 104 for tuning and detecting FM radio broadcasting. It is provided separately.

Therefore, when receiving a TV broadcast, the TV tuner 101 tunes a channel and outputs the video and audio intermediate frequency signal IF1, and the TV and FM audio detection circuit 102 transmits the TV and audio intermediate frequency signal IF1. When the radio broadcast is received, the radio tuner 103 tunes the radio broadcast and outputs an audio intermediate frequency signal IF2, and the radio audio intermediate frequency signal is output to the radio FM detection circuit (TV AUDIO output). 104 is detected and output (FM radio AUDIO output).

As described above, in the conventional FM radio receiver system, a tuner and a detection circuit must be provided for the TV and the radio, respectively, and the circuit configuration of the receiver receiver is complicated and the price is also increased.

The present invention provides a receiving apparatus capable of selecting and detecting each signal in common in one tuner and one detection circuit for different broadcast signals having different frequency bands.

The present invention performs the tuning of the broadcasting channel of the FM radio as well as the tuning of the TV broadcasting channel (video and audio) in the TV tuner, and the TV video and video signal in the TV image / FM audio detector for the tuned signal In addition, the present invention provides an FM radio and TV receiver for detecting FM radio voice signals.

According to the present invention, the TV tuner and the detection circuit can be shared by the FM radio tuner and the detection circuit by converting the FM radio audio signal into a predetermined signal so that the TV image and the audio detector can detect the signal. Provides an FM radio and TV receiver.

The present invention provides an FM radio and TV receiver that can simplify a circuit configuration by using a TV tuner, a TV video and audio FM detection circuit as a tuner and a detection circuit for receiving FM radio broadcasting.

1 is a block diagram showing a tuner and a detector in a conventional FM radio-TV receiver;

2 is a block diagram showing an embodiment of a tuner and a detector in the FM radio-TV receiver according to the present invention;

The invention includes tuning means for performing tuning for signals in a first frequency band and signals in a second frequency band; Control means for performing selective tuning control on a signal of a first frequency band or a signal of a second frequency band of said tuning means; Detection means for performing detection on the signal of the first frequency band; Converting means for converting the output signal of the tuning means into a signal including a predetermined signal enabling detection of a signal of the second frequency band of the tuning means by the sensing means; An apparatus for receiving a plurality of different band signals, characterized in that comprises a, wherein the signal of the first frequency band may be a TV broadcast signal, the signal of the second frequency band may be FM radio broadcast.

In the present invention, the signal of the first frequency band includes a video signal as a first signal and an audio signal as a second signal in one channel to be converted into respective intermediate frequency signals in the tuning means, and the detection The means detects an intermediate frequency signal for each of the first signal and the second signal, and the signal of the second frequency band is one tuned channel, the voice being a third signal equivalent to the second signal being the FM broadcast. A signal comprising a signal is converted into an intermediate frequency signal by the tuning means, and the converting means generates an image intermediate frequency signal as the first signal upon detection of the second frequency band signal, which is an FM radio as the third signal. By supplying a mixture with an audio intermediate frequency signal to the detection means, the detection means also generates signals of the first frequency band for signals of the second frequency band. The one to be regarded as a detection device for receiving a plurality of different band signals, characterized.

In the present invention, the video intermediate frequency signal as the first signal mixed with the FM radio audio intermediate frequency signal as the third signal is a pseudo video intermediate frequency signal which is distinguished from the video intermediate frequency signal output from the tuning means.

Fig. 2 shows a dual receiver in the case where the signal of the first frequency band is a TV broadcast signal and the signal of the second frequency band is an FM radio broadcast signal according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail by explaining the above features, configurations and operations of the present invention by the embodiment of the present invention of FIG.

First, looking at the configuration of the present invention FM radio dual TV receiver; A tuner 201 for tuning TV and FM radio broadcast, and on / off control operations of the mixing circuit 205 and the pseudo image intermediate frequency signal generating circuit 204 according to the TV reception mode or the FM radio reception mode. A switching unit 202, a microcomputer 203 for performing the international language of the tuner 201, a pseudo image intermediate frequency signal generation circuit 204 for generating a pseudo image intermediate frequency signal in an FM radio reception mode, The mixing circuit 205 for mixing and outputting the pseudo video intermediate frequency signal to the FM radio intermediate frequency signal of the tuner 201 in the FM radio reception mode, and the TV image and audio intermediate frequency signals output from the tuner 201. An image that detects a TV image and an audio signal, and receives an FM radio audio intermediate frequency signal and a pseudo image intermediate frequency signal supplied from the mixing circuit 205 and detects an FM radio audio intermediate frequency signal. It is configured to include an FM audio detecting circuit 206.

The microcomputer 203 is a TV tuner data storage unit 203a which stores tuner language data for TV channel tuning as a control means, and an FM radio tuner data storage unit which stores tuner language data for FM radio tuning. 203b).

Alternatively, the channel selection data storage units 203a and 203b may be stored in the microcomputer external memory.

On the other hand, the video and FM audio detection circuit 206 employs Toshiba's video and FM audio detection IC (TA1268).

The video and FM audio detection IC is provided with an intermediate frequency amplifier 207 for amplifying audio and video intermediate frequencies (A / VIF), an output of the intermediate frequency amplifier 207, and an output of the VCO oscillator 209. And a phase comparison between the output of the intermediate frequency amplifier 207 and the output of the intermediate frequency amplifier 207, a multiplication detector 208 for performing voice detection, a VCO oscillator 209 for supplying a predetermined oscillation signal to the multiplication detector 208, An APC circuit 210 for controlling an oscillator, an image signal processor 211 for processing an image signal at the output of the multiplication detector 208, and an audio signal processor for processing an audio signal at the output of the bear detector 208 And includes 212.

Reference numeral 213 denotes an external tank coil.

The operation of the FM radio and TV receiver of FIG. 2 configured as described above is as follows.

The tuner 201 for TV performs tuning of FM radio broadcasting together with tuning of a TV broadcasting channel as a detection means.

The microcomputer 203 outputs the channel selection data of the TV channel selection data storage section 203a or the channel selection data of the FM radio channel selection data storage section 203b as tuner language 201 to the tuner 201 to control the appropriate broadcasting.

The switching unit 202 supplies or cuts off the power supply Vcc of the mixing circuit 205 and the pseudo video intermediate frequency signal generating circuit 204 as a control means for determining the TV receiving mode or the FM radio receiving mode.

In the TV reception mode, the microcomputer 203 turns off the switching unit 202 to stop the operation of the mixing circuit 205 and the pseudo video intermediate frequency signal generation circuit 204, and to tune into the TV channel data storage unit 203a. The data is supplied to the tuner 201 to tune a predetermined channel desired by the user.

In this way, the audio and video intermediate frequency signals A / VIF of the selected TV broadcast channel are supplied to the video and FM audio detection circuit 206 for TV.

The video and FM audio detection circuit 206 detects TV video and audio and FM radio audio signals as detection means.

In the TV receiving mode, the audio and video intermediate frequency signals (A / VIF) input from the tuner 201 are received to detect the TV video and audio.

This operation is described for the TA1268IC.

The TA1268IC uses a known multiplication detector, which requires 45.75 MHz of a single carrier in the multiplication detector (45.75 MHz CW signal in FIG. 2), and in the TV reception mode, the middle of the image input from the tuner 201. The frequency signal is 45.75MHz, and the input TV audio intermediate frequency signal is 41.25MHz.

Therefore, the 45.75 MHz image and the 41.25 MHz audio signal are amplified by the intermediate frequency amplifier 207 and input to the multiplication detector 208, and the APC circuit 210 and the VCO oscillator 209 are phase controlled with respect to the multiplication detector 208. Phase Locking is performed in a loop to ensure accurate detection of video and audio.

The detected video signal is processed and output by the video signal processor 211, and the detected audio signal is processed and output by the audio signal processor 212 as a second intermediate frequency signal (4.5 MHz audio 2nd IF).

In the FM radio reception mode, the microcomputer 201 turns on the switching unit 202 to operate the mixing circuit 205 and the pseudo image intermediate frequency signal generation circuit 204.

In the FM radio reception mode, the microcomputer 201 inputs control data for FM radio tuning from the FM radio tuning data storage unit 203b to the tuner 201 so that FM radio broadcasting is tuned.

For example, if the FM radio reception band is 87.50 MHz to 108.00 MHz, appropriate tuning control data is applied to the TV tuner 201 to tune the signal of this band so that the FM signal is converted into an intermediate frequency signal of 41.25 MHz. To make it possible.

By the control of the microcomputer 203, the tuner 201 tunes to one FM radio broadcast channel, and as a result, outputs an intermediate frequency signal of 41.25 HMz.

That is, tuning data corresponding to a local oscillation frequency (built into tuner 201) in which an FM signal is converted to 41.25HMz is applied. For example, in order to convert FM99.3MHz to IF 41.25MHz, the locality of tuner 201 is applied. The oscillation frequency is tuned to 140.55MHz.

As such, when the local oscillation frequency of the tuner 201 is controlled to 140.55 MHz, the FM radio broadcast signal of FM99.3 MHz is converted into an FM signal for TV of 140.55 MHz-99.3 MHz = 41.25 MHz.

However, at this time, unlike the TV reception mode, since there is no image 45.75 MHz, the pseudo image intermediate frequency generation circuit 204 generates and supplies a 45.75 MHz image carrier required by the TA1268IC 206, which is an image and FM audio detection circuit.

That is, as described above, the TA1268IC 206 uses a multiplication detector to detect video and audio, and the multiplication detector 208 necessarily requires a signal of 45.75 MHz of a single carrier and is supplied from an external 45.75 MHz. When there is no video signal, there is no reference for the oscillation frequency of the VCO oscillator 209 to follow, so an unlocked signal corresponding to the tuning frequency of the external tank coil 213 called a free run frequency can be used. In this situation, the multiplication detector cannot produce accurate detection output.

Therefore, in the present invention, in the FM radio reception mode, the pseudo video intermediate frequency generation circuit 204 supplies a 45.75 MHz video carrier, which is mixed 41.25 MHz of the FM radio broadcast which is the output of the tuner 201 in the mixing circuit 205. The audio signal is mixed with the audio and supplied to the TV image and the FM audio detection circuit 206.

As such, when a 41.25 MHz signal including a 45.75 MHz image, which is an intermediate image signal, is input to the detection circuit 206, the pseudo image intermediate frequency signal is transferred from the conventional TV image and FM audio detection circuit to the 45.75 MHz image carrier. Since it is recognized, the TV detection circuit 206 regards the input FM radio 41.25MHz intermediate frequency signal as a TV FM signal to perform stable FM detection.

That is, the pseudo video intermediate frequency signal detects the pseudo video intermediate frequency signal and the audio frequency signal of the FM radio in the same manner as the TV reception mode, and in the FM radio reception mode, there is no video. The audio signal of the tuned FM radio broadcast is detected and output.

That is, the station data is set and controlled so that the FM radio signal is converted into an intermediate frequency signal of 41.25 MHz so that it can be detected by the TV image and the FM audio detection circuit. The TV signal tuner 201 and the TV detection circuit 206 can be used both by making the frequency signal generating circuit 204 and supplying the video and FM sound detection circuit 206 for the TV.

In the present invention, the TV tuner and the TV detection circuit can be shared as a circuit for FM radio tuning and detection, thereby simplifying circuit configuration, and controlling both TV and FM radio tuning for a single tuner in a microcomputer, thereby enabling both TV and FM radio. The convenience of hardware design and operation of the receiver can be ensured.

Claims (10)

Tuning means for performing tuning for each of the bands together with a TV reception band and an FM radio reception band; Control means for controlling the tuning of the tuning means with TV tuning data or FM radio tuning data; Conversion means for converting both signals of a TV band and an FM radio band into a predetermined signal that can be detected by the detection means with respect to the output of the tuning means; Detection means for detecting both the TV band and the FM radio band by detecting the output of the conversion means; FM radio-compatible TV receiver, characterized in that configured to include a. 2. The apparatus of claim 1, wherein the control means further comprises storage means having tuning data of the TV band of the tuning means and tuning data of the FM radio band. 3. The FM radio combining TV receiver as claimed in claim 2, wherein the tuning data of the FM radio band is data for the detecting means to recognize the intermediate frequency signal of the FM radio band as a TV FM intermediate frequency signal. The method according to claim 1 or 2, wherein the detection means detects a TV audio and video intermediate frequency signal, and the conversion means converts the FM audio and audio intermediate frequency signal into a signal including a TV video intermediate frequency signal. FM radio audio signal and TV video and audio signal can be detected by supplying to the detection means FM radio dual TV receiver. 5. The TV set as claimed in claim 4, wherein the converting means comprises means for generating a TV video intermediate frequency signal, and means for mixing the generated TV video intermediate frequency signal with an FM radio audio intermediate frequency signal. Receiver. Tuning means for performing tuning for both FM radio and TV signals and outputting video intermediate frequency signals and / or audio intermediate frequency signals; Control means for inputting FM radio tuning data or TV channel tuning data to the tuning means in response to a user's command to execute tuning; Pseudo image intermediate frequency generating means for generating a pseudo image intermediate frequency signal to be supplied to the detection means; Mixing means for mixing the audio intermediate frequency signal outputted from the tuning means and the pseudo image intermediate frequency signal to supply to the detection means; Detection means for receiving an audio intermediate frequency signal including a pseudo video intermediate frequency signal outputted from the mixing means and detecting the video signal and / or the audio signal; FM radio-compatible TV receiver, characterized in that configured to include a. 7. The apparatus of claim 6, further comprising: reception mode control means for turning on the mixing means and the pseudo-image intermediate frequency generating means when receiving TV, and turning off the mixing means and the pseudo-image intermediate frequency generating means when receiving the FM radio; FM radio-compatible TV receiver, characterized in that further comprises a. Tuning means for performing tuning for signals in the first frequency band and signals in the second frequency band; Control means for performing selective tuning control on a signal of a first frequency band or a signal of a second frequency band of said tuning means; Detection means for performing detection on the signal of the first frequency band; Converting means for converting the output signal of the tuning means into a signal including a predetermined signal enabling detection of a signal of the second frequency band of the tuning means by the sensing means; Apparatus for receiving a plurality of different band signals, characterized in that configured to include. 9. The signal of claim 8, wherein the signal of the first frequency band includes a first signal and a second signal in one tuned channel and is converted into respective intermediate frequency signals by the tuning means, and the detection means comprises: a first signal; Detects an intermediate frequency signal for each of the second signal and the second signal, and the signal of the second frequency band includes a third signal of the same kind as the second signal in one channel to be tuned to And converting the signal into a signal of the second frequency band by generating the first signal upon detection of the second frequency band signal and supplying a mixture of the first signal and the third signal to the detection means. A device for receiving a plurality of different band signals, characterized in that the detection means is also capable of detecting the signal as a signal of a first frequency band. Tuning means for tuning broadcast signals for both the TV receiving band and the FM radio receiving band; TV detecting means for detecting the video and audio of the TV broadcast signal tuned by the tuning means, and the audio signal of the FM radio broadcast; Outputs control data for tuning the broadcast signal of the tuning means, and upon reception of the FM radio, the FM audio intermediate frequency signal output from the tuning means is recognized as a TV FM intermediate frequency signal by the TV detection means. Control means for outputting; And a signal converting means for generating a pseudo image intermediate frequency signal upon reception of the FM radio and supplying the pseudo image intermediate frequency signal to be recognized as an image carrier in the TV detecting means.