JPH0775034A - Multi-signal receiver - Google Patents

Abstract

PURPOSE:To receive the various kinds of broadcasting and to simultaneously allocate plural channels on the same screen to be outputted corresponding to the desire of a viewer. CONSTITUTION:Ground TV broadcasting, CATV broadcasting and the broadcasting by a broadcasting satellite and a communication satellite broadcasted at present and programs supplied by so-called package media such as video tapes and optical disks, etc., are included in an input signal group 1. The plural channels are simultaneously received by information inputted from an input part 4 corresponding to the desire of the viewer, allocated on the same screen by the information inputted from the input part 4 similarly corresponding to the desire of the viewer and outputted to a display device 3. By this receiver 2, the various kinds of the broadcasting can be received and also the plural channels can be simultaneously allocated on the same screen and outputted corresponding to the desire of the viewer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inputs multi-channel signals in multiple channels and outputs the contents of desired channels among them to a display device such as a television receiver or a recording device such as a video tape recorder. With a receiving device that can
In particular, the present invention relates to a receiver that simultaneously allocates and outputs a plurality of channels on the same screen according to the viewer's request.

[0002]

2. Description of the Related Art In recent years, with the expansion of terrestrial broadcasting, satellite broadcasting, CATV broadcasting, etc., the number of broadcasting channels has increased, and
Programs supplied by so-called package media such as video tapes and optical disks are also increasing. Along with this, when a plurality of programs that the viewer desires to watch are broadcast at the same time zone, or when the viewer wants to grasp the contents of the program efficiently within a limited time, etc. A function capable of simultaneously displaying the contents of a plurality of channels in a receiver or the like is desired. As conventional examples thereof, JP-A-63-290079 and JP-A-61-265.
There is a so-called PinP (picture-in-picture) function and a multi-screen multi-display function described in Japanese Patent Publication No. 980.

[0003]

However, in the above-mentioned conventional technique, a still image is displayed on a PinP sub-screen or a multi-screen, and at the most, both PinP parent and child screens are displayed as moving images. Only channels are displayed as moving images, and it is not considered to display more than one channel as moving images. In addition to the normal terrestrial broadcasting as described above, CATV broadcasting using coaxial cables and optical fibers, broadcasting formats such as broadcasting using broadcasting satellites and communication satellites are diversified, and in addition to conventional television signals such as conventional NTSC signals. , Signals such as high-definition television signals are also distributed, but reception of these signals is not considered.

An object of the present invention is to provide a receiving apparatus capable of receiving various broadcasts and simultaneously allocating and outputting a plurality of channels on the same screen according to the viewer's request.

[0005]

[0006]

In order to achieve the above object, the present invention enables variable continuous tuning from the TV signal and CATV signal bands to the BS signal band, and the BS tuning circuit.
At least two BS / TV / CATV shared tuners that are shared for signal reception, TV signal reception, and CATV signal reception are provided for the number of channels that the viewer desires to display a moving image at the same time. An operation console or a remote control console (remote control) for selecting the position, display area, display angle, etc., and an image processing circuit for allocating the screen based on the information from the console and outputting to the display device and the recording device were provided. In addition, an expansion unit was installed to add a tuner and demodulation unit separately.

[0007]

According to the present invention, with the above configuration, it is possible to provide a receiving device capable of receiving various broadcasts and simultaneously allocating and outputting a plurality of channels on the same screen according to the viewer's request. In addition, since the viewer can add a tuner and a demodulation unit separately as needed, the expandability of the receiving device is ensured. Furthermore, the display area, position, and angle of at least one screen to be displayed can be set arbitrarily.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the concept of the present invention. In the figure, 1 is an input signal group, 2 is a receiving device of the present invention, 3 is a display device, 4 is an input unit including a keyboard, a remote control device and the like.

The input signal group 1 includes terrestrial TV broadcasting currently being broadcast, CATV broadcasting, broadcasting by broadcasting satellites and communication satellites, programs supplied by so-called package media such as video tapes and optical disks, and the like. . The receiving device 2 simultaneously receives a plurality of channels from the above by the information input from the input unit 4 according to the viewer's request, and receives them from the input unit 4 according to the viewer's request. Are assigned to the same screen and output to the display device 3. The receiving device 2 enables reception of various broadcasts, and also allows a plurality of channels to be simultaneously allocated and output on the same screen according to the viewer's request.

Next, an embodiment of the receiving device 2 is shown in FIG.
In FIG. 1, parts that perform the same operations as in FIG.
The same numbers are given to omit the description. In the figure, 5 is a terrestrial TV broadcasting signal input terminal, 6 is a broadcasting satellite, a first intermediate frequency signal (BS signal, CS signal) input terminal for broadcasting by a communication satellite, 7 is a CATV broadcasting signal input terminal, and 8 is a baseband. Composite signal input terminal, 9 is RGB (three primary colors)
Red signal input terminal of signals, 10 is a green signal input terminal of RGB (three primary colors) signals, 11 is a blue signal input terminal of RGB (three primary colors) signals, 12 is RGB
Sync signal input terminal for (three primary color) signals, 13 is an output terminal, 14 is a front end section including a tuner section and a demodulation section, 15 is an audio output terminal, 16 and 18 are sync separation circuits, 19 is a luminance signal and color signal separation And the like, 20 is a memory, 21 is a display control unit, 22 is an output circuit, 23 is a timing generation circuit, 24 is a control unit that controls channel selection and output, and 25 is information received from the input unit 4. The receiving unit 26 for performing high-definition television signals (for example, MU
SE signal) and an output terminal to a scrambled pay broadcast signal decoder, and 27 is an input terminal from a high definition television signal and a scrambled pay broadcast signal decoder.

In the front end section 14, the input terminals 5,
Terrestrial TV broadcast signal, BS signal, CS input from 6, 7
Among the signal and the CATV broadcast signal, a plurality of channels are simultaneously received according to the control signal output from the control unit 24 according to the tuning information input from the input unit 4 according to the viewer's request, and after demodulation, output. The signal processing unit 1
9 and the sync separation circuit 16 separates the sync signal and inputs it to the timing generation circuit 23. Similarly, the baseband composite signal input from the input terminal 8 is also input to the signal processing unit 19, the synchronization separation circuit 18 separates the synchronization signal, and the separated signal is input to the timing generation circuit 23. Further, the RGB signals input from the input terminals 9, 10, 11, 12 are also input to the signal processing unit 19 in the same manner, and the synchronization signal is input to the timing generation circuit 23. The signal processing unit 19 performs luminance signal separation, color signal reproduction, audio signal reproduction, and the like on the signal from the front end unit 14 and the composite input signal, and adjusts the signal level for the RGB input signal. The plurality of sets of RGB signals and audio signals output from the signal processing unit 19 are output to the memory unit 20 according to the control signal from the control unit 24. In the memory unit 20, each signal is converted into a digital signal, and is written in a predetermined memory by a write control signal generated in the timing generation circuit 23 in accordance with a synchronization signal of each signal. This memory unit 2
The signal reading from 0 is controlled so that a plurality of channels are simultaneously allocated and output on the same screen according to the control signal output from the control unit 24 according to the output information input from the input unit 4 according to the viewer's request. The read control signal from the display control unit 21 is output to the output circuit 22. The output circuit 22 adjusts the signal level and outputs it to the output terminal 13. If a high-definition television signal or a scrambled pay broadcast signal decoder is required for the signal from the front end unit 14 or the composite input signal, the decoder outputs the signal to the decoder from the terminal 26 and the decoder to the terminal 27. Then, the signal is input to the signal processing unit 19 in the same manner as described above, the sync signal is separated by the sync separation circuit 16, and the signal is input to the timing generation circuit 23.
Although one input signal has been described, a plurality of systems are provided according to the viewer's request.

In this embodiment, it is possible to receive terrestrial TV broadcasting, CATV broadcasting, broadcasting using broadcasting satellites and communication satellites,
In addition to ordinary television signals such as conventional NTSC signals, high-definition television signals and scrambled pay broadcasts can be received, and multiple channels are simultaneously allocated and output on the same screen according to the viewer's request. It becomes possible. Further, the display area, position, and angle of at least one screen to be displayed can be arbitrarily set.

FIG. 3 is a block diagram showing an embodiment of the front end portion of the present invention. In the figure, parts that perform the same operations as in the embodiment shown in FIG. 2 are assigned the same numbers as in FIG. 2 and their explanations are omitted. In the figure, 40 and 41 are BS / TV /
CATV common front end, 42, 46 and 48 are terrestrial TV signal and CATV signal input terminals, 43, 47 and 49
Is a BS signal input terminal, 51 and 53 are satellite broadcast demodulation signal output terminals, and 50 and 52 are TV signal demodulation signal output terminals, 5
8, 59 are channel selection signal input terminals, 60 is a terrestrial TV signal, C
An RF signal processing circuit including an input tuning filter for ATV signals, an amplification circuit, and an interstage tuning filter, 61 is an RF signal processing circuit including an input tuning filter for BS signals, an amplification circuit, and an interstage tuning filter, and 62 is an RF signal Switching circuit, 63
Is a frequency conversion circuit, 64 is a local oscillation circuit, and 65 is a PLL
Frequency synthesizer using (phase locked loop), 55
Is an RF signal processing circuit 6 for terrestrial TV signals and CATV signals
0, RF signal processing circuit 61 for BS signal, RF signal switching circuit 62, frequency conversion circuit 63, local oscillation circuit 64, P
A tuner unit composed of a frequency synthesizer 65 using LL, 66 is an intermediate frequency signal processing circuit for performing band selection and amplification for intermediate frequency signals of terrestrial TV signals and CATV signals, 6
7 is an intermediate frequency signal processing circuit for performing band selection and amplification for the second intermediate frequency signal of satellite broadcasting, 68 is a terrestrial TV signal, C
A demodulation circuit that demodulates the intermediate frequency signal of the ATV signal, and 69 is a demodulation circuit that demodulates the second intermediate frequency signal of the satellite broadcast.

Antenna for receiving terrestrial TV broadcasting and CATV
A signal from a signal input terminal and a BS signal received by a satellite broadcasting receiving antenna and frequency-converted to a 1 GHz band are input from input terminals 42 and 43, respectively, and are split into two, and a BS / TV / CATV shared tuner 40, 41 are input to respective input terminals 46, 48 and 47, 49. Here, a BS / TV / CATV shared tuner will be described. BS / TV / CATV common front end 4
0 and 41 are BS from the terrestrial TV signal and CATV signal band
The wideband frequency conversion circuit 63, the local oscillation circuit 64, and the tuning frequency synthesizer circuit 65 are shared by BS signal reception, TV signal reception, and CATV signal reception so that variable continuous tuning can be performed up to the signal band. It is composed of a tuner section for simplifying the circuit and each demodulation section. Terrestrial TV signal, CATV signal (in Japan, about 90-770M
When the desired channel is received from the input signal from the input terminal 46, the desired signal is input from the RF signal processing circuit 60 to the PLL frequency synthesizer according to the channel selection signal input to the channel selection signal input terminal 58. The tuning voltage outputted from the circuit 65 allows the signal to selectively pass therethrough, and the signal is amplified or attenuated to a desired signal level, and then inputted to the frequency conversion circuit 63 via the switching circuit 62. Frequency conversion circuit 63
Then, a local oscillation signal from a local oscillation circuit 64 whose oscillation frequency can be changed according to the tuning voltage is converted into an intermediate frequency (58 MHz band in Japan) and output. The intermediate frequency signal is further band-selected by the intermediate frequency signal processing circuit 66, amplified to a desired signal level, demodulated into a video and audio signal by the demodulation circuit 68, and output terminal 50,
It is output via 44. On the other hand, satellite broadcasting (domestic BS-
When the desired channel is received from the IF signal of approximately 1030 to 1330 MHz), the desired channel is similarly selected from the signal input from the input terminal 47.
At 1, the signal is selectively passed and amplified or attenuated to a desired signal level, input to the frequency conversion circuit 63 via the switching circuit 62, and the local oscillation signal from the local oscillation circuit 64 causes an intermediate frequency (in the case of domestic, Convert to 400MHz band) and output. The intermediate frequency signal is further band-selected by the intermediate frequency signal processing circuit 67, amplified to a desired signal level, demodulated into video and audio signals by the demodulation circuit 69, and output via the output terminals 51 and 44.

By using the front end section 14 having the above-described structure, in addition to the effect described in the embodiment of FIG. 2, the circuit scale of the terrestrial TV broadcast, CATV broadcast, and satellite broadcast front end circuits is shared. Can be reduced, and when they are configured in the same chassis, the mounting volume can be reduced. Receiving terrestrial TV broadcasting or CATV broadcasting and satellite broadcasting at the same time with two front ends, and
It is possible to receive two terrestrial TV broadcast programs or CATV broadcast programs at the same time, or two satellite broadcast programs at the same time. BS / TV / C
If the configuration is such that the reception band of the ATV shared tuner is expanded to receive the CS signal, the CS signal can be received in addition to the above effect.

FIG. 4 is a block diagram showing another embodiment of the front end portion of the present invention. In the figure, parts that perform the same operations as in the embodiment shown in FIGS. 2 and 3 are assigned the same numbers as in FIGS. 2 and 3 and their explanations are omitted. In the figure, 27a is an input terminal from the decoder, 27b is a control signal (keyed pulse) input terminal from the decoder, 54 is a high-definition signal output terminal, and 70, 71, 72 and 73 are BS.
TV / CATV common front end, 74 and 77 switching circuits, 75 MUSE / NTSC discriminating means, and 76 NT
TV / CATV signal demodulation circuit equipped with SC signal demodulation circuit and MUSE signal demodulation circuit, 78 BS signal processing circuit, 79 TV signal processing circuit, 80 demodulation circuit switching control means, 81 AGC system switching circuit, Reference numeral 82 is a local oscillation frequency switching control means, and 83 is a MUSE decoder.

In Japan, high-definition television broadcasting using satellites is carried out by MUSE signal. There, the MUSE original signal is FM-modulated and transmitted by a satellite broadcasting channel having a bandwidth of 27 MHz. On the other hand, MU
Transmission of SE signals also in CATV is being studied, in which FM modulation is used in the same way as satellite broadcasting in order to maintain high image quality, and narrower bandwidth (bandwidth approx. The case of using AM modulation capable of transmission at 12 MHz) is considered. In view of this point, the present embodiment adds a standard television signal such as an NTSC signal,
MUS by satellite broadcasting as high definition television signal
It is characterized by receiving an E signal (FM modulation) and a MUSE signal (FM modulation, AM modulation) by CATV broadcasting.
That is, as in the embodiment of FIG. 3, the BS / TV / CATV is used.
The IF signal output from the shared tuner unit 55 is input to the BS signal demodulation circuit 69 or the TV / CATV signal demodulation circuit 76 and demodulated. As for the BS signal, the video and audio signals are collectively FM-modulated, and the BS signal demodulation circuit 69 performs the FM demodulation operation and the NTSC system or M which is the demodulation signal.
Demodulating signal switching circuit 74 for USE baseband signal
Output to. Also, as for TV signals, the video signals are AM-modulated and the audio signals are FM-modulated and transmitted.
The V signal demodulation circuit 76 performs the video signal AM demodulation operation and the audio signal FM demodulation operation, and outputs the video demodulation signal and the audio demodulation signal to the demodulation signal switching circuit 74. Next, when the CATV signal is selected, if the CATV signal has the same transmission method as the TV signal, the same signal processing as that when the TV signal is selected is performed, and therefore the description thereof will be omitted. Next, if the selected CATV signal is an AM-modulated MUSE signal,
The video and audio signals are collectively AM-modulated, and the occupying bandwidth becomes about 12 MHz by adding the residual sidebands to the base band bandwidth of 8.1 MHz.
A band twice as large as one M transmission channel (6 MHz) is required. Further, the MUSE signal differs from the NTSC signal in the positive polarity and the negative polarity in the synchronizing signal. Therefore, it is not suitable to use the AGC circuit that uses the horizontal synchronizing signal of the NTSC signal, which is conventionally used in the AM demodulator for the NTSC signal.
Therefore, demodulation circuit (for NTSC, MUSE) and AGC
It is necessary to switch the system, the signal demodulated by the TV / CATV signal demodulation circuit 76 is discriminated by the MUSE / NTSC discrimination means 75 through the switching circuit 74, and the TV / CATV signal demodulation circuit 76 is set by the demodulation circuit switching control means 80 ( (Both NTSC and MUSE) are switched internally, and by the AGC system switching circuit 81,
The AGC system related to the tuner 55 is switched and controlled, and the demodulated signal is input from the output terminal 26 to the MUSE decoder 83 through the switching circuit 77 and processed. The demodulation circuit has a wideband demodulation characteristic for MUSE signals.
It is also possible to share it with an NTSC signal by using the LL synchronous detection method. Also, in the AGC circuit, for the MUSE signal,
It is desirable to use a keyed AGC circuit that uses a keyed pulse output from the MUSE decoder 83 and input from the input terminal 27b.

If the next selected CATV signal is an NTSC or MUSE FM modulation signal, the BS signal demodulation circuit 6 is used for demodulation instead of the TV / CATV signal 76.
The baseband signal of the NTSC system or the MUSE system is output to the demodulation signal switching circuit 74. The demodulation circuit can be switched by a control signal from the control unit 24 according to the tuning information.
The signal from the TV signal demodulation circuit 76 is converted to MUSE / NTSC.
The CAT transmitted by FM modulation is discriminated by the discrimination means 75, and the local oscillation frequency switching control means 82 controls the switching of the local oscillation frequency in the tuner section 55.
The V signal is the BS second intermediate frequency signal. The subsequent processing is the same signal processing as when the BS signal is selected. In the AGC system switching control circuit 81, the AGC voltage input from the BS signal demodulation circuit 69 and the TV / CATV signal demodulation circuit 76 is switched, and the A in the tuner section 55 is changed.
Apply to the GC circuit. As a simple means, of the BS signal demodulation circuit 69 and the TV / CATV signal demodulation circuit 76,
If a normal AGC voltage is input from the demodulation circuit performing the demodulation operation and a zero potential is input from the other demodulation circuits, the AGC control circuit 81 can be configured by a simple addition circuit.

As described above, not only the BS signal, the TV signal, and the CATV signal can be received by the front end section of this embodiment, but also the tuner section 55 can be used when the BS / TV / CATV signal is received. Since it is commonly used, a receiver having a simple circuit configuration and excellent operability can be obtained. Also, C
FM even if the ATV signal transmission method is the AM modulation method
Even if it is a modulation system, the television signal system is NTSC
Receiving is possible with either the system or the MUSE system. Also, by using a plurality of BS / TV / CATV common front ends 70, 71, 72, 73, it is possible to perform simultaneous simultaneous channel selection operation for TV signals, CATV signals, and BS signals at each front end, and further, respectively. Since it has a signal processing circuit, it can receive multiple TV signals simultaneously.
Various reception forms such as simultaneous reception of a plurality of BS signals, simultaneous reception of a plurality of CATV signals, simultaneous reception of TV and BS signals, simultaneous reception of CATV and BS, simultaneous reception of TV and CATV are possible. In terms of signal format, NTSC-AM, NT
From SC-FM, MUSE-AM, and MUSE-FM, simultaneous reception is possible in any combination of signal formats including the same format.

FIG. 5 is a schematic diagram showing the expandability of the receiving apparatus of the present invention. In the figure, 90 is a tuner section,
A front end pack in which a front end part including a demodulation part is built in a predetermined package, 91 is a decoder pack in which a high-definition television signal or a decoder for a scrambled signal is built in a predetermined package, and 92 is a composite signal input Composite pack, 93
Is an RGB pack corresponding to an RGB signal and a synchronization signal input.

The receiving device main body 2 includes a signal processing unit, a memory unit, an output circuit, which is provided after the sync separation circuit of the embodiment shown in FIG.
The display control unit, the timing generation circuit, the control unit, the input unit, and the like are configured, and the front end unit, the composite signal input unit, the RGB signal, and the synchronization signal input unit are separately provided, the input signal format and the number of the viewer's desired. According to, it is configured by any combination.

In this configuration, the desired number of input sections can be installed in accordance with the desired input signal format at the desired time of the viewer, which is highly expandable and simplifies external wiring. , The usability is improved. Although a decoder can be provided outside the receiving device, if the receiving device is built in another package, the installation place can be reduced.

By incorporating the receiving apparatus described herein into a television receiver, a video tape recorder, etc., the external wiring can be further simplified, the usability is improved, and the power supply section can be shared. The device can be simplified.

[0025]

According to the present invention, it is possible to provide a receiving device capable of receiving various broadcasts and capable of simultaneously allocating and outputting a plurality of channels on the same screen according to the viewer's request. In addition, since the viewer can add a tuner and a demodulation unit separately as needed, the expandability of the receiving device is ensured. Furthermore, the display area, position, and angle of at least one screen to be displayed can be set arbitrarily.

By using the BS / TV / CATV shared tuner, not only the BS signal, the TV signal and the CATV signal can be received, but also the tuner circuit and the selector can be selected when the BS / TV / CATV signal is received. Since the station means is shared, a receiver having a simple circuit configuration and excellent operability can be obtained.

Further, by using the BS signal demodulation circuit, the NTSC signal AM demodulation circuit, and the MUSE signal AM demodulation circuit, the television can be used regardless of whether the CATV signal transmission system is the AM modulation system or the FM modulation system. Receiving is possible regardless of whether the John signal system is the NTSC system or the MUSE system.

Further, by providing the local oscillation frequency switching control means, even if the CATV signal transmission system is the AM transmission system or the FM transmission system, the BS signal demodulation process or the TV / CATV signal demodulation process is selected to perform the signal processing. Has the effect that is possible.

By providing MUSE / NTSC discriminating means, it is possible to receive high-definition broadcasts. In addition, by providing an AGC system switching circuit and demodulation circuit switching control means, CATV broadcasting is a MUSE signal of AM modulation system. Even with good reception performance,
It also has the effect of being able to receive multi-channel high-definition broadcasting by CATV.

Further, according to the present invention, a TV signal, a CAT
In a receiving device that receives a V signal and a BS signal, and switches and outputs two or more sets of video and audio signals, outputs a TV demodulation signal, a CATV demodulation signal, and a BS demodulation signal by sharing a channel selection circuit, a frequency conversion circuit, and the like. Together with TV signal, CA
A TV signal and a BS signal are input from the same terminal. A demodulated signal from a front end having a simple configuration is switched to and input to two or more demodulated signal processing circuits to output a signal, thereby receiving a plurality of TV signals and a plurality of CATVs. Signal reception, multiple TV signal reception, simultaneous reception of TV and BS signals, CAT
Various reception forms such as simultaneous reception of V and BS signals and simultaneous reception of TV and CATV signals are possible.

[0031]

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the concept of the present invention.

FIG. 2 is a block diagram showing an embodiment.

FIG. 3 is a block diagram supplementing the embodiment.

FIG. 4 is another block diagram supplementing the embodiment.

FIG. 5 is a schematic diagram supplementing the example.

[Explanation of symbols]

1 ... Input signal group, 2 ... Multi-signal receiving device, 3 ... Display device,
4 ... Input unit, 5 ... Terrestrial TV broadcast input terminal, 6 ... Satellite broadcast input terminal, 7 ... CATV broadcast input terminal, 8 ... Composite signal input terminal, 9, 10, 11, 12 ... RGB signal and its synchronization signal input terminal , 13 ... Signal output terminal, 14 ...
Front end part, 16, 18 ... Synchronous separation circuit, 19 ...
Signal processing unit, 20 ... Memory unit, 21 ... Display control unit, 22
... output circuit, 23 ... timing generation circuit, 24 ... control unit, 25 ... receiving unit, 40, 41, 70, 71, 72, 7
3 ... BS / TV / CATV shared tuner.

Claims (4)

[Claims] 1. A TV signal input section, a front end section for selecting and demodulating signals, a signal processing circuit for reproducing video and audio signals, a selecting section, a display controlling section, a keyboard, a remote control, etc. A multi-signal receiving apparatus, comprising: a synchronization separating circuit, a timing generating circuit, and at least a memory section capable of writing and reading a video signal. 2. The multi-signal receiving apparatus according to claim 1, wherein a terrestrial TV broadcast signal and a CATV are provided in the front end section.
Variable continuous tuning is possible from the broadcasting signal band to the first intermediate frequency signal (BS signal) band of satellite broadcasting, and the channel selection circuit is shared between BS signal reception, TV signal reception and CATV signal reception. A multi-signal receiving apparatus comprising at least one shared tuner. 3. A TV signal input section, a front end section for channel selection and demodulation, a signal processing circuit for reproducing video and audio signals, a channel selection and display control section, a keyboard, a remote control, etc. In the receiving device configured by the input unit of the above, an input terminal capable of inputting at least two signals and a terrestrial TV broadcast signal and a CATV in the front end unit.
Variable continuous tuning is possible from the broadcasting signal band to the first intermediate frequency signal (BS signal) band of satellite broadcasting, and the channel selection circuit is shared between BS signal reception, TV signal reception and CATV signal reception. A multi-signal receiving apparatus comprising at least two shared tuners, at least two or more sync separation circuits, a timing generation circuit, and at least a memory unit capable of writing and reading a video signal. 4. A TV signal input section, a front end section for selecting and demodulating signals, a signal processing circuit for reproducing video and audio signals, a tuning and display controlling section, a keyboard, a remote control, etc. In the receiving device composed of the input section, the front end section is provided with a detachable slot so that any front end section can be replaced or expanded without requiring any specialized knowledge. A multi-signal receiving device characterized by: