JPH06303541A - Television receiver - Google Patents

Abstract

PURPOSE:To reduce a production cost by evading substantial change in hardware design. CONSTITUTION:This receiver is comprised in such a way that switch parts SW1, SV2 are switched so as to supply the video signal of the tuner part 1 to a CRT 6, and audio signals L, R to a VTR 4 and speakers L, R(9, 12) by a control part 13, and furthermore, the channel selection operation of the tuner part 2 is stopped when, the same channel is channel-selected by tuner parts 1, 2. Thereby, it is possible to solve a beat due to the influence of a local frequency by the operation of a control part without depending on the hardware design and to reduce burden on a designer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver having an integrated VTR having a plurality of tuner sections and a multi-screen display function.

[0002]

2. Description of the Related Art At present, there is known a television receiver having a built-in VTR capable of reproducing and recording VHS (registered trademark) or 8 mm video tape.
FIG. 6 is a perspective view showing an example of such a VTR-integrated type television receiver. For example, at the lower part of the display screen of the television receiver 40, an inlet / outlet opening 42 for a video tape cassette is provided, and a channel is provided. In addition to the operation buttons 41 for switching and adjusting the volume, an operation section 43 for performing operations such as playing / stopping a video tape, and an eject button 43a used when taking out a video tape cassette.
Is provided. In such a television receiver, an image source or the like received and selected by the television receiver 40 is recorded (in this case, audio recording is included) or a video without connecting an external VTR or the like. You can play the software.

Particularly, in recent years, in the above-mentioned VTR-integrated television receiver, a tuner and a V that are normally used are provided.
It is known that by incorporating two tuners of a TR recording tuner, it is possible to record a back program currently being watched by the user. FIG. 7 is a block diagram conceptually showing a VTR-integrated type television receiver configured to have such two tuner sections. 31
Indicates a tuner unit used in a normal time, and 32 indicates a VTR recording tuner unit, both of which receive broadcast radio waves,
After tuning, the video signal and the audio signal are extracted from the received radio wave and output. Reference numeral 33 denotes a VTR incorporated in the television receiver, to which the video signal and audio signal of the tuner section 32 are input. Therefore, the tuner unit 32
The video source received by can be recorded, and when the video software or the like is played back, the played video signal and audio signal can be output through the output terminal.

[0004] T ₅₁ through T ₅₆ in the switch portion SW ₄ shows the terminal, T ₅₁ through T ₅₃ are terminals of the video signal system, the video signal of the tuner section 31 to the terminal T ₅₁ is the terminal T ₅₂ The video signal of the VTR 33 is input to the input terminal, the terminal T ₅₃ is connected to the input side of the video processor 34, and the terminal T ₅₃ is selectively switched between the terminals T ₅₁ and T ₅₂ . On the other hand, T ₅₄ through T ₅₆ in the audio signal system of the terminal, the terminal T ₅₄
Audio signal tuner 31 to have, the terminal T ₅₆ VT
R33 audio signal is input, the terminal T ₅₆ is connected to the input side of the audio processor 36, terminal T ₅₆ is switched alternatively to the terminal T _54, T _55. Also,
The video signal system terminal T ₅₃ and the audio signal system terminal T ₅₆ are switched in conjunction with each other.

Reference numeral 34 denotes a video processor that performs various signal processing on the input video signal and outputs the finally amplified RGB signal. The RGB signal output from the video processor 34 causes the CRT 35 to display an image. The Rukoto. An audio processor 36 performs various processes on the input audio signal and outputs the processed audio signal to the amplifier 37. The audio signal is amplified by the amplifier 37 and supplied to the speaker 38, so that the audio signal is output.

For example, when watching a television normally, the terminal T ₅₃ is connected to the terminal T ₅₁ and the terminal T ₅₆ is connected to the terminal T ₅₄ in the switch section SW ₄ . Therefore, in this case, signal paths for the video signal and the audio signal output from the tuner section 31 to reach the CRT 35 and the speaker 38 are formed. At this time, if the user arbitrarily selects the receiving channel of the tuner section 32 for VTR recording and sets the VTR 33 in the recording mode, the video source selected by the tuner section 32 at this time can be recorded. For example, so-called back program recording is also possible.

When the VTR 33 reproduces video software or the like, the switch T SW ₄ has a terminal T.
₅₃ is switched to terminal T ₅₂ and terminal T ₅₆ is switched to terminal T ₅₅ . As a result, the video signal and audio signal output from the VTR 33 are supplied to the CRT 35 and the speaker 38, and the user can see the video software or the like being reproduced. Although not shown, the VTR33
Can also be equipped with an input terminal for recording video and audio signals supplied from the outside.

Similarly, as a device in which a plurality of tuner units are built in one television receiver, a television receiver having a multi-screen display function is known in which a plurality of tuner units are provided. . For example, 1
A television receiver capable of displaying two sub-screens is provided with a tuner section for the main screen and a tuner section for the sub-screen.
It is possible to display a multi-screen on a television receiver alone without connecting an external device equipped with a tuner such as.

[0009]

By the way, in a VTR-integrated type television receiver as shown in FIG.
It is naturally conceivable to watch a channel and record the same channel. At this time, the tuner section 31 and the tuner section 32 are in the state of selecting the same channel, and therefore the local frequencies of both are also the same. However, even when the tuner units having the same specifications select the same channel, it is general that the actual local frequency is slightly deviated due to an error in the characteristics of parts and the like. For this reason, in a VTR-integrated television receiver having a plurality of tuner units, the local frequencies of the tuner units or the harmonics of each other are different from each other as shown in FIG. However, as a result, noise is superimposed on the signal, and beat interference or the like appears in the image. Particularly, in a VTR-integrated television receiver which is relatively small in size, this problem becomes remarkable because the tuner units are arranged adjacent to each other. Further, also in a television receiver having a multi-screen display function, the same problem occurs when a plurality of tuner units are provided.

Therefore, noises such as beats due to the above-mentioned causes have been eliminated from a hardware standpoint, but this requires a great deal of study time and know-how, which imposes a heavy burden on the designer. Further, there is a problem that the manufacturing cost becomes high because the design is greatly changed.

[0011]

In order to solve the above problems, the present invention has at least two tuner units for selecting and outputting a video signal and an audio signal from a selected broadcast radio wave, and at least these two tuner units. A video signal and an audio signal from one or more tuner units are input, and a switch unit is provided which can switch the input signals and selectively supply them to each functional circuit unit connected in a subsequent stage. A means for detecting that at least two tuner units of one or more tuner units have tuned to the same channel, and to stop tuning other than a specific tuner unit among the plurality of tuner units that have tuned to the same channel. A television receiver is configured by providing a control unit having means, and the video signal and audio output from the specific tuner unit by the control unit. No. was decided to be able to switch said switch means so as to be supplied to the respective functional circuit. Further, the above-described configuration is applied to a television receiver integrated with a VTR, and further to a device having a multi-screen display function.

[0012]

When a plurality of tuner units tune to the same channel, the other tuner units except one tuner unit stop the channel selection, and the tuner units outputting the channels output the signals. By controlling the switch unit so as to distribute the video signal and the audio signal to the required circuit unit, the tuner unit is not affected by the mutual local frequency, and the noise such as the beat is eliminated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the present invention is applied to a VTR integrated type television receiver will be described below as an embodiment. In addition,
The appearance of the television receiver of this embodiment may be the same as that shown in FIG. 6, for example. FIG. 1 shows the VTR of this embodiment.
FIG. 1 is a block diagram showing a main part of an integrated type television receiver. In FIG. 1, 1 is a tuner unit used in a normal time, 2 is a tuner unit mainly used for recording a VTR, both of which receive broadcast radio waves, After tuning, the video signal, the audio signal L (left), and the audio signal R (right) are extracted from the received radio wave and output, that is, stereo broadcast compatible. In this case, if the received radio waves are audio multiplex broadcasts (main language / sub audio broadcasts such as bilingual broadcasts, except stereo broadcast in this case), the tuner section selects the main / sub audio. Be seen. Therefore, when the main voice is output, the main voices are output from the voice signals L and R, respectively, and when the sub-voice is output, the sub-voices are output from the voice signals L and R respectively, and both the main and the sub-voices are output. In this case, for example, the main voice is output as the voice signal L and the sub voice is output as the voice signal R.

Reference numeral 3 denotes an external input terminal block, which is a video signal and an audio signal L of a video source input from an external device.
The audio signal R is output. Reference numeral 4 denotes a VTR (magnetic recording / reproducing device section) built in the television receiver, which can record the video signal, the audio signal L, and the audio signal R output from the tuner section 2 as a video source as described later. In addition, it is possible to reproduce the video tape and output the reproduction signal from the output terminals of the video signal and the audio signals L and R.

SW ₁ and SW ₂ are switch sections whose terminals are switched by a control signal from the control section 13. The switch unit SW ₁ has T _{1 to} T ₆ (video signal system),
T _{11 to} T ₁₆ (voice signal L system), T _{21 to} T ₂₆ (voice signal R)
System) terminals, and terminals T ₅ and T ₆ are terminals T ₁ to
It is switched to T _{4 as} an alternative, and terminals T ₁₅ and
T ₁₆ is switched to terminals T _{11 to} T ₁₄ , and terminals T ₂₅ and T ₂₆ are switched to terminals T _{1 to} T ₂₄ , respectively.

In the video signal system, the terminal T ₁ is the video signal of the tuner section 1, the terminal T ₂ is the video signal of the tuner section 2, and the terminal T ₃ is the video signal of the external input terminal block. The video signal output of the VTR 4 is connected to T ₄ . The terminal T ₅ is connected to the input side of the video processor 5, and the terminal T ₆ is connected to the video signal input terminal of the VTR 4. In the audio signal L system, the audio signal L of the tuner unit 1 is input to the terminal T ₁₁ , the audio signal L of the tuner unit 2 is input to the terminal T ₁₂ , the audio signal L of the external input terminal block is input to the terminal T ₁₃ , and the terminal T is input. The terminals T ₃₃ of the switch unit SW ₂ are connected to ₁₄ respectively. The terminal T ₁₅ is on the input side of the audio processor 7, and the terminal T ₁₆ is the audio signal L of the VTR 4.
Connected to the input terminal of. Terminal T in the audio signal R system
₂₁ is the audio signal L of the tuner unit 1, T ₂₂ is the audio signal L of the tuner unit 2, T ₂₃ is the audio signal L of the external input terminal block, and T ₂₄ is the switch unit S.
The terminals T _{34 of} W ₂ are respectively connected. Also, the terminal T ₂₅
Is on the input side of the audio processor 10, and the terminal T ₂₆ is V
It is connected to the audio signal R input terminal of TR4.

The switch unit SW ₂ has terminals T _{31 to} T ₃₄ , and the terminals T ₃₃ and T ₃₄ are selectively switched to the terminals T ₃₁ and T ₃₂ . The output terminals of the audio signal L and the audio signal R of the VTR 4 are connected to the terminals T ₃₁ and T ₃₂ , respectively. Therefore, according to the switching of the terminals in the switch unit SW ₂ , the switch unit SW ₂
Either the audio signal L of the VTR 4 or the output of the audio signal R is input to the terminals T ₁₄ and T ₂₄ of ₁ .

Reference numeral 5 denotes a video processor that performs various processes on a video signal input based on a control signal from the control unit 13 and finally outputs an amplified RGB signal, which is supplied from the video processor 5. An image is displayed on the CRT 6 by the RGB signal. Further, 7 and 10 are audio processors that perform various processes on the audio signal input based on the control signal from the control unit 13. The signal processed by the audio processor 7 is output to the amplifier 8 and amplified. After that, it is supplied to the speaker L (left side) 9 and output as a sound. The signal processed by the audio processor 10 is also output to the amplifier 11 and amplified, and then the speaker R (right side).
It is supplied to 12 and is output as voice.

Reference numeral 13 denotes a control unit composed of a microcomputer, etc., and as shown in the figure, a tuner unit 1, a tuner unit 2, a VTR 4, a video processor 5, an audio processor 7, an audio processor 10, a switch unit SW ₁ , and a switch unit. A control signal is output to SW _{2 and the} like to control various operations. Further, each circuit section is configured to be controlled based on an instruction input from an operation section provided in the television receiver shown in FIG.

FIG. 1 shows a signal path when the tuner section 1 and the tuner section 2 receive different channels, for example, when a user watches one channel and records a video source of another channel. This signal path is indicated by the bold line in the figure.

In this case, in the video signal system of the switch unit SW ₁ , the terminals T ₁ and T ₅ are connected and the terminal T ₂
Switching control is performed so that the terminal T ₆ and the terminal T ₆ are connected.
In the audio signal L system, terminals T ₁₁ and T ₁₅ and terminals T ₁₂ and T
₁₆ are connected, and in the audio signal R system, terminals T ₂₁ and T ₂₅ and terminals T ₂₂ and T ₂₆ are switched to be connected.
In this case, since the signal output terminals of the video signal of the VTR 4 and the audio signals L and R are irrelevant, the switch unit SW ₂
In particular, no switching control is performed.

Therefore, as shown in the figure, the video signal of the tuner section 1 is supplied to the video processor 5 through the terminals T ₁ → T ₅ of the switch section SW ₁ and displayed on the CRT. Further, the audio signal L of the tuner section 1 is supplied to the audio processor 7 via the terminals T ₁₁ → T ₁₅ of the switch section SW ₁ , amplified by the amplifier 8 and output as audio by the speaker L 9. Similarly, the audio signal R is supplied to the audio processor 10 via the terminals T ₂₁ → T ₂₅ of the switch unit SW ₁ , amplified by the amplifier 11 and output as audio by the speaker R 12.

On the other hand, the video signal of the tuner section 2 is supplied to the video signal input terminal of the VTR 4 via the terminal T ₂ → T ₆ of the switch section SW ₁ , and the audio signal L is supplied to the VTR 4 via the terminal T ₁₂ → T _16. The audio signal R is supplied to the audio signal L input terminal of the VTR 4 via the terminals T ₂₂ → T ₂₆ .

By forming such a signal path,
For example, the user can select and watch one channel while recording another channel.

Next, referring to FIG. 2, when the tuner section 1 and the tuner section 2 are both selecting the same channel, that is, the channel of the image source displayed on the screen and the image being recorded at the same time. The case where the source channels are the same will be described.

When the tuner unit 1 is switched from the state shown in FIG. 1 to become the same channel as the reception channel with the tuner unit 2, the tuner unit 1 is controlled to stop the channel selection operation. A signal path is formed so that the video signal of the tuner unit 2 and each signal of the audio signals L and R are supplied to the input terminals of the CRT 6, the speakers L and R, and the video signal of the VTR 4 and the audio signals L and R. The Rukoto.

Therefore, in the video signal system of the switch section SW ₁ , both terminals T ₅ and T ₆ are connected to the terminal T ₂ , and in the audio signal L system, the terminal T ₁₄ is connected to the terminal T ₁₅ and the terminal T _{12 is connected.} The control unit 13 performs switching control so that the terminal T ₁₆ is connected to the terminal T. In the audio signal R system, the terminal T ₂₄ is connected to the terminal T ₂₅ and the terminal T ₂₂ is connected to the terminal T ₂₆ . The switching operation of the switch unit SW ₂ will be described later.

By the above switching control, the switch unit SW ₁
The signal path passing through is shown in the thick line in the figure.
That is, the video signal of the tuner section 2 is supplied to the video processor 5 via the terminal T ₂ → T _5, and then displayed on the CRT 6 as an image, and at the same time VT via the terminal T ₂ → T _6.
It will be input to the video signal input terminal of R4. Further, the audio signal L of the tuner unit 2 is input to the input terminal of the audio signal L of the VTR 4 via the terminals T ₁₂ → T _16, and the audio signal R of the tuner unit 2 is input to the VT via the terminals T ₂₂ → T _26.
The audio signal R of R4 is input to the input terminal.

At this stage, the video signal of the tuner unit 2 is distributed and supplied to the CRT 6 side and the VTR 4 side by the switch unit SW ₁ , and the audio signals L and R are input to the input terminal of the VTR 4. Becomes Therefore, VTR4
Since all of the video signal and the audio signal L and R of the tuner unit 2 are input to the, the recording is enabled.

By the way, as described above, the switching of the main / sub audio mode is normally performed in the tuner section.
When recording on the VTR 4, it is necessary to record the main / sub audio as the audio signal L and the audio signal R respectively. Therefore, the tuner unit 2 does not switch the mode of the main / sub audio and outputs the main / sub audio. The audio signals L and R are output in association with each other.

Therefore, the audio signal L of the tuner unit 2,
As for R, the switch unit SW ₁ does not distribute it to the audio processors 7 and 10 side.
After supplying to the input terminal of R4, VT as described below
And outputs to the switch unit SW ₂ through the output terminal of R4, is to supply to the audio processor side after switching of the main / sub audio mode in the switching unit SW _2.

As described above, the video signal of the tuner section 2 and the audio signals L and R are input to the VTR 4 and are ready for recording, but the audio signals L and R are VTR.
4 through the output terminal of the switch unit SW ₂ terminals T ₃₁ , T
Supplied to ₃₂ each.

In the switch section SW ₂ , when the received radio wave of the tuner section 2 is a normal monaural or stereo broadcast, the terminal T ₃₃ is connected to the terminal T ₃₁ and the terminal T ₃₄ is connected to the terminal T ₃₂ . The switching control is performed as described above. Alternatively, if the received radio wave of the tuner unit 2 is voice-multiplexed and the user has selected the main audio mode, both terminals T ₃₃ and T ₃₄ are connected to the terminal T ₃₁ and the sub audio mode is selected. If so, both terminals T ₃₃ and T ₃₄ are switched to be connected to terminal T ₃₂ . Further, when the mode for simultaneously outputting the main / sub audio is selected, it can be switched to the same state as the above-mentioned normal monaural or stereo broadcasting.

Therefore, the signal paths of the audio signals L and R output from the VTR 4 are formed as follows according to each audio mode. That is, when the received radio wave of the tuner unit 2 is set to a mode for outputting monaural, stereo broadcast, or main / sub audio at the same time, the audio signal L is switched to the switch S
From the terminal T ₃₁ → T _{33 of} W _{2 to} the terminal T of the switch unit SW ₁ .
₁₄ → is supplied to the audio processor 7 via T ₁₅ ,
Further, it is amplified by the amplifier 8 and output as sound from the speaker L9. Further, from the audio signal R switch portion SW ₂ of the terminal T ₃₂ → T _34, via the terminal T ₂₄ → T ₂₅ of the switch portion SW ₁ is supplied to the audio processor 10, a speaker R12 are amplified further by the amplifier 11 Is output as audio from. This allows the user to separately listen to monaural, stereo broadcast, or main / sub audio from the left and right speakers (9, 12).

Further, if the user has selected the main audio, the audio signal L VTR4 via T ₁₄ → T ₁₅ of the switch portion SW ₁ from the terminal T ₃₁ → T ₃₃ of the switch portion SW ₂ A signal path supplied to the audio processor 7,
Switch unit SW ₂ terminal T ₃₁ → T ₃₄ to switch unit SW
Audio processor 10 via the _first terminal T ₂₄ → T ₂₅
And the signal path supplied to the. As a result, the audio signal L is finally distributed and supplied to the speaker L9 and the speaker R12, and the user can hear only the main audio.

Further, if the user has selected the sub-audio is audio signals R VTR4 from the terminal T ₃₂ → T ₃₃ of the switch portion SW ₂ of the switch unit SW ₁ terminal T ₁₄ → T ₁₅
The signal path supplied to the audio processor 7 via the switch unit SW ₂ and the signal path supplied from the terminal T ₃₂ → T _{34 of the} switch unit SW ₂ to the audio processor 10 via the terminal T ₂₄ → T ₂₅ of the switch unit SW _1. Thus, the audio signal R is finally distributed and supplied to the speaker L9 and the speaker R12. Therefore, the user can hear only the sub-audio.

That is, by switching the respective voice signals L and R by the switch section SW ₂ , V
In TR4, main / sub voices are recorded in each of the L and R channels, and the user can arbitrarily switch the main / sub voices to listen. The switch SW
₂ is used not only in the case described above, but also in the case of switching the main / sub audio recorded in the L and R channels of the video tape when the VTR 4 reproduces.

As described above, when the channel currently being viewed by the user is the same as the channel recorded on the VTR 4, the receiving operation of the tuner section 1 is stopped and the radio wave received by the tuner section 2 is stopped. Since the local frequency is not radiated from the tuner unit 1 by supplying the video signal and the audio signal to the VTR 4 and the CRT 6 and the left and right speakers, noise is superimposed on the signal of the tuner unit 2 by buffering the local frequency. Will be eliminated. Therefore, the user can see an image without a beat, and the beat etc. of the video signal recorded in the VTR 4 is eliminated.

Next, the processing operations such as the switching of the switch units SW ₁ and SW ₂ and the stop of tuning of the tuner unit 1 will be described with reference to the flowcharts of FIGS. 4 and 5. FIG. 4 is a flowchart showing a processing operation when the tuner unit 1 and the tuner unit 2 receive the same channel. When the tuner unit 1 and the tuner unit 2 are in the state of receiving the same channel, the control unit 13 first proceeds to (F101) step F102,
A control signal is output to the switch unit SW ₁ to output terminals T ₅ , T ₆
To terminal T ₂ , terminal T ₁₅ to terminal T ₁₄ , terminal T
_After switching the terminal ₁₆ to the terminal T ₁₂ , the terminal T ₂₅ to the terminal T ₂₄ , and the terminal T ₂₆ to the terminal T ₂₂ , the connection between the terminals of the switch unit SW ₁ is changed to the state shown in FIG. 1, and then the process proceeds to step F103. Step
In F103, it is determined whether or not the broadcast currently received by the tuner unit 2 is a multiplex audio broadcast with main / sub audio, and it is determined that it is not a multiplex audio, that is, a monaural or normal stereo broadcast. In case step F104
If it is determined to be the multiplex audio broadcasting by the main / sub audio, the process proceeds to step F105.

In step F105, it is determined whether the user has selected the audio mode of the main audio or the sub audio for the currently received main / sub audio broadcast, and the mode for listening to the main audio is selected. If is selected, the process proceeds to step F106, if it is the mode for listening to the sub voice, the process proceeds to step F107, and if it is the mode for listening to both the main and sub voices at the same time, the process proceeds to step F104. . In step F104 to the switch unit SW ₂ outputs a control signal, the terminal T ₃₃ to the terminal T _31, switches respectively terminals T ₃₄ to the terminal T _32. As a result, the outputs of the audio signals L and R of the tuner unit 2 are finally supplied to the speaker L9 and the speaker R12, respectively, and the user listens to monaural or stereo broadcast, or the main audio (speaker L9) and the sub-audio. The voice (speaker R12) can be heard at the same time.
Then, the process proceeds to step F108.

[0041] switched to the terminal T _33, T ₃₄ is the terminal T ₃₁ together in step F106 the switch portion SW _2, the sub-routine proceeds to step F108 after this. As a result, the audio signal L of the tuner unit 2 is finally changed to the speaker L9 and the speaker R1.
Both are output, and the user can hear only the main voice.

In step F107, after the terminals T ₃₃ and T _{34 of the} switch SW ₂ are both switched to the terminal T ₃₂ , step F1
Since the process proceeds to 08, the audio signal R of the tuner unit 2 is finally supplied to the speaker L9 and the speaker R12, so that only the sub audio is output as audio. Then, in step F108, the tuning operation of the tuner unit 1 is stopped, and then the process returns to the main routine.

The switching control of the switch unit SW ₁ is configured to be performed within the blanking interval in synchronization with the vertical synchronizing signal of the video signal of the radio wave received by the tuner unit 2. As a result, it is possible to suppress image flicker and the like when the video displayed on the CRT 6 is switched from the video signal of the tuner unit 1 to the video signal of the tuner unit 2.

Further, when the tuner section 1 and the tuner section 2 are set to receive different channels, FIG.
The process shown in the flowchart of FIG. For example, the channel and VTR the user is currently watching as shown in FIG.
From the same state as the channel recording in 4,
When the user operates the channel key to watch another channel, the control unit 13 receives this instruction input and proceeds to the routine shown in FIG. That is, when it is determined that the tuner unit 1 receives a channel different from that of the tuner unit 2 based on the channel change instruction input in Step F201, the control unit 13 proceeds to Step F202 and the current tuner unit 1 determines whether or not the tuning operation is stopped. Then, if the tuning operation of the tuner unit 1 is not stopped, the process proceeds to step F204, but if the tuning operation of the tuner unit 1 is stopped, the process proceeds to step F203, for example, the channel corresponding to the instruction input. After starting the tuning operation for, the process proceeds to step F204.

In step F204, the switch unit SW ₁
Terminal T ₅ to terminal T ₁ , terminal T ₆ to terminal T ₂ , terminal T ₁₅ to terminal T ₁₁ , terminal T ₁₆ to terminal T ₁₂ , terminal T ₂₅ to terminal T ₂₁ , and terminal T ₂₆ . The terminal T ₂₂ is switched to each. As a result, the signal paths of the video signals and the audio signals L and R of the tuner unit 1 and the tuner unit 2 are shown in FIG.
It will return to the state described in.

Note that when the same channel is received, it is possible to stop the tuning operation of the tuner unit 2 and supply each signal of the tuner unit 1 to a required circuit unit. If the configuration is such that the signal from the tuner section 2 for VTR recording is supplied as in the example, even when the user switches channels during recording,
Since the terminal connection for supplying a signal to each input terminal of the VTR 4 in the switch section SW ₁ is always fixed without switching, the recorded video signal and audio signal are not disturbed on the way. In the television receiver of this embodiment, the video source supplied from the external input terminal block 3 is also VT by switching the terminals of the switch unit SW _1.
Record on R4 and CRT4, speaker L9, speaker R
It is possible to output to 12 but the description is omitted. In addition, the processing operation shown in FIG. 5 is also configured to be performed within the blanking interval in synchronization with the vertical synchronizing signal of the video signal of the radio wave received by the tuner unit 1.
It is possible to avoid image distortion when the display image is switched.

Next, as another embodiment, a case where the present invention is applied to a television receiver having one child screen display function will be described with reference to FIG. This Figure 3
Is a block diagram showing a main part of a television receiver having one child screen display function. Reference numerals 21 and 22 denote tuner parts, respectively, which extract video signals and audio signals from received radio waves and output them. There is. SW ₃ is a switch unit which the terminal is switched by the control unit 29, this is a video signal system switch portion SW ₃ the terminal T ₄₁ through T ₄₄ are provided, the terminal T _43, T ₄₄ are both terminals T _41, T _It shall be switched to either of the ₄₂ . Further, terminals T _{45 to} T ₄₇ are provided in the audio signal system, and the terminal T ₄₇ is connected to the terminals T ₄₅ and T _47.
It shall be switched to any of the ₄₆ .

In the video signal system, the video signal output terminal of the tuner section 21 is connected to the terminal T ₄₁ , the video signal output terminal of the tuner section 22 is connected to the terminal T ₄₂ , and the terminal T ₄₃ is connected to the video processor 23. And the terminal T ₄₄ are connected to the input side of the field memory 24, respectively. In the audio signal system, the terminal T ₄₅ is the tuner section 2
The audio signal output terminal of 1 is the tuner section 2 at the terminal T _46.
The second audio signal output terminal is connected, and the terminal T ₄₇ is connected to the input side of the audio processor 26.

A video processor 23 is a switch unit S.
The video signal supplied from the terminal T _{43 of} W ₃ is subjected to various processes and output to the CRT 25 as an amplified RGB signal. Reference numeral 24 is a field memory used for displaying a small screen, and the video signal supplied from the terminal T ₄₄ is converted into a digital signal and writing and reading are performed at a predetermined timing. The data read from the field memory 24 is output to the video processor 24,
The video signal is combined with the video signal from the terminal T _{43 by the} video processor 24 and output to the CRT 25, so that it is displayed as a child screen at a predetermined position on the screen. Reference numeral 26 is an audio processor, which performs various processes on the audio signal supplied from the terminal T ₄₇ and supplies it to the amplifier 27.
Then, the audio signal input by the amplifier 27 is amplified and supplied to the speaker 28 so that it is output as audio. Reference numeral 29 denotes a control unit which outputs a control signal to each circuit unit to control various operations as shown in the figure.

Here, when the tuner sections 21 and 22 receive different channels and the video source of the tuner section 21 is displayed on the main screen and the video source of the tuner section 22 is displayed on the sub-screen, the switch section SW is selected. _In the video signal system ₃ , the terminal T ₄₃ is connected to the terminal T ₄₁ and the terminal T ₄₄ is connected to the terminal T _{42. In} the audio signal system, the terminal T ₄₃ is connected.
₄₇ will be connected to terminal T ₄₅ . As a result, the video signal of the tuner section 21 is transmitted to the video processor 2
3, the video signal of the tuner unit 22 is supplied to the field memory 24. As a result, the video signal of the tuner unit 21 is displayed on the CRT 25 as the main screen and the video signal of the tuner unit 22 is displayed as the sub screen. Becomes At this time, in the audio signal system of the switch unit SW _3, the audio signal of the tuner unit 21 is input to the audio processor 26, and the audio corresponding to the main screen is output from the speaker 28.

From the above state, the switch SW
The terminal T ₄₃ of the video signal system ₃ is switched to the terminal T ₄₂ and the terminal T ₄₄ is switched to the terminal T ₄₁ , and the terminal T _{47 of the} audio signal system is switched.
Is switched to the terminal T ₄₆ , the video signal of the tuner unit 21 is displayed on the sub-screen and the video signal of the tuner unit 22 is displayed on the main screen, and the sound of the tuner unit 22 displayed on the main screen is displayed by the speaker. It is possible to output from 28.

In this embodiment, when the tuner section 21 and the tuner section 22 receive the same channel, in the video signal system of the switch section SW ₃ , both terminals T ₄₃ and T ₄₄ are connected to the terminal T _41. The terminal T ₄₇ of the audio signal system is switched to the terminal T ₄₅ . Further, the tuner unit 22 is controlled to stop the tuning operation.

Therefore, the video signal of the tuner section 21 is distributed and supplied to the video processor 23 and the field memory 24, and the CRT 25 displays the image of the same channel received by the tuner section 21 as the main screen. It will be displayed on the child screen. Further, the audio signal of the tuner unit 21 is output as audio by the speaker 28 via the switch unit SW ₃ , the audio processor 26, and the amplifier 27. Also, the tuner unit 2 does not radiate the local frequency from the tuner unit 2.
Since it does not affect 1, noise such as beats due to the effect of local frequency does not appear on the screen.

In the above embodiment, the tuner section 22 is stopped to select an image of the tuner section 21.
Although an audio signal is supplied to each circuit section, in this case, conversely, the tuning operation of the tuner section 21 is stopped and the video and audio signals of the tuner section 22 are supplied to each circuit section. It may be configured as follows. Also in the case of the present embodiment, it is preferable that the switching control of the switch unit SW ₃ is performed within the blanking interval of the vertical synchronizing signal. Further, although the audio signal is monaural in the present embodiment, it goes without saying that it can be stereo compatible. Further, it can be applied to a television receiver having a so-called picture-out-picture function.

As described above, in each of the embodiments described above, when two built-in tuner units tune to the same channel, the tuning of one tuner unit is stopped and the tuning is performed. By supplying the video signal and the audio signal of the tuner section to the required circuits, the noise due to the influence of mutual local frequency is eliminated. Since the method in each of the above-described embodiments can be dealt with mainly by the processing operation of the control unit, it is possible to realize the elimination of beats and the like much more easily than in the case of hardware design.

In each of the above embodiments, the case where two tuner sections are provided has been described, but the present invention can be applied to an apparatus having three or more tuner sections built therein. In this case, at least two tuner sections are applicable. When two tuner units receive the same station, the reception operation is stopped except for one specific tuner unit among these tuner units that have received the same station. Then, the video / audio signals of one tuner section which continues the receiving operation are supplied to the required circuit section.

[0057]

As described above, in the television receiver of the present invention, when a plurality of tuner units tune to the same channel, one tuner unit selected from the tuner units tuned to the same channel. This is approximated by switching the switch unit so as to supply the video signal and the audio signal to the required circuit unit, and controlling the other tuner units that have selected the same channel so that the tuning operation is stopped. The effect of eliminating the influence of the local frequency and eliminating noise such as beats is obtained. Moreover, since the effect is realized by the software means by the control unit without depending on the hardware design, the burden on the designer can be reduced and a large hardware design change can be avoided. It also has an effect on cost reduction.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a television receiver integrated with a VTR according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a signal path when the same channel is received in a VTR-integrated television receiver according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a main part of a television receiver having a child screen function which is another embodiment of the present invention.

FIG. 4 is a flowchart showing a processing operation of a control unit in the embodiment of the present invention.

FIG. 5 is a flowchart showing a processing operation of a control unit in the embodiment of the present invention.

FIG. 6 is a perspective view showing the external appearance of a VTR-integrated television receiver of this embodiment.

FIG. 7 is a block diagram showing a main part of a television receiver integrated with a VTR in a conventional example.

FIG. 8 is an explanatory diagram showing an influence of a local frequency in a conventional VTR-integrated television receiver.

[Explanation of symbols]

1,2,21,22 tuner 4 VTR 13, 29 control unit _{SW 1, SW 2, SW 3} , SW 4 switch unit _{T 1 ~T 6, T 11 ~T} 16, T 21 ~T 26, T 31 ~ T ₃₄ , T
_{41 to} T ₄₆ terminals

Claims (3)

[Claims] 1. Two or more tuner units for selecting and outputting a video signal and an audio signal from a selected broadcast radio wave, and inputting and inputting a video signal and an audio signal from at least the two or more tuner units. The switching means for switching the generated signal to selectively supply the functional circuits connected to the subsequent stage, and at least two tuners of the two or more tuners select the same channel. A control unit is provided that includes means for detecting that the selected channel has been selected, and means for stopping the tuning of a plurality of tuner units that have selected the same channel, except for a specific tuner unit. The switch means is switched so that the video signal and the audio signal output from the tuner section are supplied to the respective functional circuit sections. Vision receiver. 2. The television according to claim 1, wherein the two or more tuner units, the switch unit, and the control unit are applied to a device integrated with a VTR. John receiver. 3. The two or more tuner units, the switch unit, and the control unit are applied to a device having a multi-screen display function.
Alternatively, the television receiver according to claim 2.