JPH0614277A - Television receiver - Google Patents

Abstract

PURPOSE:To halve the number of terminals by discriminating the television broadcasting by means of the detection signal from a high-definition television signal detection circuit and making an output to an output terminal by a control circuit and the selecting operation of a selector based on the signal. CONSTITUTION:Based on a signal (the output of a MUSE signal detection circuit 18) discriminating whether or not a MUSE signal detected by a MUSE/NTSC converter 3 is being received, a control signal C is generated in a control circuit 20 by the signal and a selector signal from an external input terminal 19, controlling selectors 4, 5, and 6. Thus, the NTSC/high-vision broadcasting is discriminated and digital voice signals of 1 and 2 channels at the time of broadcasting are selected and outputted to a 1st digital voice terminal 15 and digital voice signals of 3 and 4 channels at the time of high-vision broadcasting are outputted to a 2nd digital voice output terminal 16. At the same time, bit stream signals are switched by both broadcasting modes and outputted to a same output terminal 17.

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, when receiving television signals of different broadcasting systems and detecting them respectively,
The present invention relates to a television receiver provided with a selective receiving means for reproducing each type of digital audio signal.

[0002]

2. Description of the Related Art Hi-vision broadcasting, which is expected as a next-generation broadcasting medium, has also started test broadcasting on a dedicated channel, and has finally entered the stage of practical application. In preparation for such a high-definition era, high-definition televisions and high-definition monitor devices with wide screens capable of receiving and reproducing high-definition broadcasts are being announced one after another.

High-definition broadcasting is an M program developed by NHK.
Band-compressed by the USE method and transmitted by satellite waves. To receive this, use a MUSE decoder or, more simply, a high definition MUSE signal with the current NTS.
A MUSE / NTSC converter for converting to C signals is required, and the development of these devices is also progressing. As the high-definition receiver, this MUSE decoder and MUSE / NTSC converter are built in, and the current NTS
A type that can selectively receive and reproduce both C broadcast and high-definition broadcast has been announced.

On the other hand, high-definition audio broadcasting is currently NT
As with the SC system satellite broadcasting, a high-quality digital audio system is adopted. Also, as the high definition audio broadcasting mode, a variety of broadcasting modes using 4 channels are adopted, unlike the current system. Therefore, the audio output terminal of the high-definition receiver is not limited to the analog audio format, but in order to transmit the audio signal with high quality in a digital signal state to other digital audio equipment,
Some products have digital audio formats.

In addition, in the current satellite broadcasting and high-definition broadcasting, it is planned to use the audio channel to transmit various data and information other than television audio. This type of signal is a bitstream signal for the data channel, which is to be output in serial digital form.

Regarding the digital audio system and the digital audio interface in the satellite broadcast receiver and the MUSE receiver, for example, the journal Vo of the Television Society is published.
l. 43, No. 6 (1989) p576-577 "
Recent home AV equipment ".

[0007]

In the above-mentioned prior art, as the digital audio processing system of the high-definition receiver, there are separate processing circuits for the current satellite broadcasting and the high-definition broadcasting, and the separate processing circuits are used for the processing. The digital voice of is output. In addition, as for the HDTV audio signal, while that of current broadcasting is 2 channels,
It uses a 4-channel system.

Therefore, in such a system (television receiver) in which a plurality of types of broadcasting systems coexist,
As described above, there has been a problem in what form the processing method and the output method of the digital voice having the different number of channels should be.

Further, as with the digital audio signal, it is a problem how to provide an output terminal for a bit stream signal having a different processing method in both broadcasting systems.

Further, even when a digital audio signal or a bit stream signal which has been reproduced and output is input by an external device without going through the internal processing circuit of the high-definition receiver, how to set the output path and the terminal on the television. The problem was whether to install it in the receiving device.

Further, regarding the second-generation EDTV broadcast aiming at high image quality as in the high-definition broadcast, the form of its audio output in the television receiving device is completely undecided.

As described above, an object of the present invention is to provide a high-definition television broadcast receiver (television receiver) such as a high-definition receiver or a second-generation EDTV receiver.
An object of the present invention is to realize a device capable of outputting a digital audio signal or a bit stream signal in an optimum output format even with different broadcasting systems.

It is also an object of the present invention to provide a television receiver provided with a device capable of outputting with the same output system as the digital signal generated by the internal processing circuit even when these digital signals are supplied from an external input terminal. It is in.

Further, only a single digital data signal (for example, a bit stream signal) before demodulation from this external input terminal is also demodulated and reproduced by the demodulator inside the receiver also serving as an optimum digital audio signal output. It is an object of the present invention to provide a television receiving device including a device that realizes a form.

[0015]

In order to achieve the above object, the means for identifying the current NTSC / high definition television broadcast, the current NTSC broadcast and the high definition television as a digital audio signal output path of the television receiver. A television receiver is provided with a selector for switching and selecting a digital audio signal and a bit stream signal in John broadcasting, a control circuit for controlling the selecting operation, and a plurality of output terminals for outputting the selected digital audio signal and bit stream signal. It is a thing.

Further, a plurality of input terminals for inputting a digital audio signal and a bit stream signal from the outside, each digital audio signal in NTSC broadcasting and high definition television broadcasting as the selector, or from an external input terminal The television receiver has a function of switching and selecting the bit stream signal by the control circuit.

Further, demodulation means for demodulating an externally input digital signal to reproduce audio data and a clock, and audio data and a clock of a broadcast signal generated inside the receiver, between the externally input data and the clock, A television receiver is provided with a selector to be selected and its control means.

[0018]

In the television receiver of the present invention, N
TSC / high-definition television broadcast discrimination is performed by a detection signal from a high-definition television signal detection circuit, and based on the signal, a control circuit and a selector select operation to perform a digital audio signal and bit stream at the time of the broadcasting. Switch to signal and output to common output terminal.

Further, when a plurality of digital audio data signals are supplied from the external input terminal, the digital audio data signal is supplied from the external input terminal at the time of broadcasting according to the control circuit.
The digital audio signal and the bit stream signal are switched by the selector and output to the common output terminal.

Further, when only a single external input digital audio data signal (which may be a bit stream signal, for example) is supplied, the audio data and clock are reproduced by the demodulating means, and the data, clock and receiver are reconstructed. The data and clock of the generated broadcast audio signal are switched by the selector by the control means, and the selected output signal is decoded by the audio decoder inside the receiver to generate a digital audio signal. Next, this digital audio signal and the digital audio signal generated in the receiver in another broadcast mode are selected by the selector and output to the common output terminal.

[0021]

EXAMPLES Examples of the present invention will be described below. Figure 1
It is a block diagram which shows the audio | voice data output circuit as the principal part of one Example of this invention. For convenience of description, first, the case where the high definition television signal is a high definition (MUSE) signal will be described.

In FIG. 1, 1 is an input terminal for a BS first intermediate frequency signal from an antenna unit (not shown), and 2 is a B terminal.
It is an S tuner. Although the internal detailed operation and the drawing are omitted in the figure, the BS tuner 2 selects a desired channel from the first intermediate frequency signal, performs FM demodulation, and outputs a BS video signal. It also outputs the QPSK-demodulated NTSC broadcast digital audio signal N1. At the same time, the bit stream signal NB, which is digital audio data, is also output.

Reference numeral 3 is a MUSE / NTSC converter (hereinafter abbreviated as M / N converter), which is a BS tuner 2
Is a device that receives the FM demodulated MUSE detection output signal and converts the MUSE signal into an NTSC signal.

The M / N converter 3 converts 1125 scanning lines of high-definition into 525 scanning lines,
Outputs TSC video signal. The 4-channel digital audio signal is also PCM demodulated here and reproduced and output in an analog or digital format. here,
A digital audio signal M1 including 1 and 2 channel audio and a digital audio signal M2 including 3 and 4 channel audio are shown. It also outputs a bit stream signal MB which is digital audio data of high-definition broadcasting.

Numerals 4, 5 and 6 are selectors, which are switched and controlled by a control signal C from a control circuit 20 which will be described later. The selector 4 receives the digital audio signal N1 from the BS tuner 2 at the time of NTSC broadcasting, and the b terminal receives the digital audio signal M1 from the M / N converter 3 at the time of high-definition broadcasting.

Therefore, the selector 4 switches and selects the digital audio signals of channels 1 and 2 of NTSC or high-definition broadcasting and outputs them as the signal D1 from the c terminal. The a terminal of the selector 5 is fixed to zero potential, and the digital audio signal M2 at the time of high-definition broadcasting from the M / N converter 3 is input to the b terminal.

Therefore, the selector 5 selects the digital audio signals of the channels 3 and 4 only during the high-definition broadcasting and outputs them as the signal D2 from the c terminal. Selector 6
The bit stream signal NB at the time of NTSC broadcast from the BS tuner 2 is input to the terminal a of the above, and the bit stream signal MB at the time of high definition broadcast from the M / N converter 3 is input to the terminal b.

Therefore, the selector 6 switches and selects the bit stream signal of NTSC or high definition broadcasting and outputs it as the signal BI from the c terminal. Reference numerals 7 and 8 denote digital interface circuits, which are two systems of digital audio signals D selected from the selectors 4 and 5 described above.
1, D2 are input.

The circuits 7 and 8 perform predetermined modulation and signal format conversion processing so that the audio signal can be transmitted / received to / from other digital audio equipment (not shown) in a digital signal state. This is standardized as a BS tuner digital audio interface (EIAJ standard CP-340).

The digital audio signals from the circuits 7 and 8 are input to the pulse transformers 9 and 10 where they are converted to a predetermined amplitude level and passed through resistors 12 and 13 (usually 75Ω).
It outputs from the output terminals 15 and 16, respectively. Also selector 6
The bit stream signal BI from is directly input to the pulse transformer 11, is also converted into a predetermined amplitude level, and then is output from the output terminal 17 via the resistor 14 (usually 75Ω).

Next, there is a method for controlling the switching of the selectors 4, 5 and 6, which uses a signal indicating whether or not the MUSE signal detected by the M / N converter 3 is being received (the output of the MUSE signal detecting circuit 18). Based on the signal and the external input terminal 1
A control signal C is generated in the control circuit 20 from the selector signal from the selector 9 to control the selection switching operation of the selectors 4, 5, and 6 described above.

As described above, in the audio data output circuit of FIG. 1, the NTSC / high-definition broadcast is identified, the digital audio signals of channels 1 and 2 at the time of the broadcast are selected, and the first digital audio output is made. To terminal 15,
The second digital audio output terminal 16 outputs digital audio signals of channels 3 and 4 for high-definition broadcasting.

At the same time, the bit stream signal is also switched in both broadcasting modes and output to the same output terminal 17. In addition, the M / N in the high-definition receiver shown in this embodiment
Even if a MUSE decoder is used instead of the converter 3,
Although the circuit scale becomes large, it can be configured in the same manner. Further, the audio data output circuit of the present high-definition receiver can be applied to both a receiver having a display with an aspect ratio of 16: 9 and a receiver having a display with an aspect ratio of 4: 3.

FIG. 2 is a block diagram showing an audio data output circuit as an essential part of another embodiment of the present invention. The embodiment of FIG. 2 is different from the embodiment of FIG. 1 in that the HDTV receiver (television receiver) of the present invention has two digital audio signal input terminals for external input and a bit stream input terminal. The digital data generated in the receiver according to the embodiment of the present invention in each of the two broadcast modes and these external input signals can be appropriately switched and output to the common output terminal.

The embodiment shown in FIG. 2 will be described below. The same parts and functional blocks as in FIG. 1 are indicated by the same numbers. Reference numeral 29 surrounded by a broken line represents a high-definition receiver (television receiver) according to the present invention.

Reference numeral 28 denotes an external MUSE decoder, which inputs the 1 and 2 channel signals E1 and the 3 and 4 channel signals E2 of digital audio at the time of high definition broadcasting to the external input terminals 25 and 26 of the high definition receiver 29, respectively. Also, the bit stream signal EB is input to the external input terminal 27.
Entered in.

These signals E1, E2, EB are guided to the digital interface circuit 51, where they are converted into a predetermined signal format, and then the selectors 2 respectively.
It is led to the b1 terminals of 1, 22, and 23. In circuit 51,
It is a receiving interface circuit described in the standard relating to the digital audio interface.

Reference numerals 21, 22, and 23 denote selectors each having three inputs and one output. The terminals a and b of the selector 21 are connected to the N from the BS tuner 2 as described in FIG.
The digital audio signal N1 at the time of TSC broadcasting and the 1 and 2 channel digital audio signal M1 at the time of high-definition broadcasting from the M / N converter 3 are input. The 1 and 2 channel digital audio signals supplied from the MUSE decoder 28 are input from the interface circuit 51 to the b1 terminal.

Similarly to the embodiment shown in FIG. 1, the a and b terminals of the selector 22 have zero potential and M / N converter 3 respectively.
3 and 4 channel digital audio signals at the time of high-definition broadcasting from are input. Further, the b1 terminal receives from the interface circuit 51 the 3 and 4 channel digital audio signals for high-definition broadcasting supplied by the MUSE decoder 28.

Next, the bit stream signal at the time of NTSC broadcasting from the BS tuner 2 and the bit stream signal at the time of high-definition broadcasting from the M / N converter 3 are input to the a and b terminals of the selector 23, respectively, and b1
The bit stream signal supplied from the MUSE decoder 28 is input to the terminal from the interface circuit 51.

The control signal C1 generated by the control circuit 24 controls the selection switching operation of these selectors. In the above embodiment, it is NTS that the a terminals of the selector 5 (FIG. 1) and the selector 22 (FIG. 2) are set to zero potential.
Since the digital audio signal at the time of C broadcasting is only two channels of 1 and 2, there is no signal to be input when the selectors 5 and 22 select the same broadcasting mode.
This is because it is necessary to mute the signal so that it is surely a silent signal.

C of each of the selectors 21, 22, 23
The signals output from the terminals are then output to the terminals 15, 16 and 17, respectively, through the same paths as in the embodiment of FIG. Also in this embodiment, the HDTV receiver 2
Instead of the M / N converter 3 inside 9, a MUSE decoder can be used in the same way. On the contrary, M of external connection
It goes without saying that the same configuration can be achieved by using an M / N converter instead of the USE decoder 28.

Next, an example of the control method of each selector in the above embodiment will be described. FIG. 3 is a block diagram showing another example of the control method of the audio data output device of FIG. 3, the same parts as those of FIG. 1 are designated by the same reference numerals.

Referring to FIG. In the M / N converter 3, the MUSE from the BS tuner 2 supplied to the M / N converter 3
The detected signal is converted into a digital signal by the A / D conversion unit 36, and the synchronization signal and the clock are regenerated by the synchronization detection PLL unit 30. These regenerated signals are A / D
Along with the D-converted data, the video processing circuit 31 and the MU
It is guided to the SE voice processing circuit 32.

At this time, when the MUSE signal arrives in the PLL unit 30 and the PLL (face locked loop circuit) is locked, the MUSE lock signal ML indicating that the high-definition broadcast is being received is output.

Of the decoded high-definition audio signals from the audio processing circuit 32, the digital audio signals M1 of 1 and 2 channels are input to the b terminal of the selector 4 and the digital audio signals of 3 and 4 channels. The signal is input to the b terminal of the selector 5, and the bitstream signal MB is input to the b terminal of the selector 6.

Then, the MUSE lock signal ML is supplied to the selectors 4, 5 and 6 as a control input signal to control the signal selection switching operation. For example, the synchronization detection PLL unit 3
If the external signal ML signal from 0 is "H" for high-definition broadcasting and "L" for NTSC broadcasting, the selector 4,
5 and 6 are "H" of the control signal ML, the b terminal input signal, "
By selecting operation of a terminal input signal with L ″, terminal 3
A desired signal can be output to each of 3, 34 and 35.

FIG. 4 is an explanatory view showing one concrete example of the control method of the audio data output device of the embodiment of FIG. In FIG. 4, C represents an external control signal, ML is a MUSE lock signal indicating that the high-definition broadcast is being received, and MU
It is output from the SE signal detection circuit 18.

In FIG. 2, signals C and ML are control circuits 2
4 to generate a signal C1 for controlling the selectors 21, 22, 23. That is, as shown in FIG.
And ML are combined to perform selector control as shown in the figure. For example, when the signal C is "H", each selector selects and outputs an externally input digital audio signal and bit stream signal.

Further, the signal C is "L" and the signal ML is "H".
In the case of, since the high-definition broadcast is being received, the digital audio signal and the bit stream signal in the high-definition broadcast are selected and output.

The feature of this control method is that the external input signal or the received broadcast signal is selected by the external input control signal C. Next, in the case of selecting the broadcast signal, the MUSE lock signal is detected to detect the NTSC broadcast or the high-definition broadcast. Of digital audio signals and bitstream signals.

Control circuit 24 for realizing the above functions
As a specific circuit of, for example, ROM (Read On
A circuit using a microcomputer or the like can be given.

FIG. 5 is a block diagram showing still another audio data output device used in the embodiment of the present invention. The audio data output device shown in FIG. 5 is different from that described above in that only one external input terminal is provided as an external audio digital data input terminal and the digital audio data is used to be incorporated in the high-definition receiver 29. The point is that the desired high-definition digital audio signal and bit stream signal are output by using the audio decoder 38 in the M / N converter 3.

The circuit configuration and operation will be described below with reference to FIG. The parts and circuit blocks having the same functions as those of the previous embodiment have the same numbers, and their explanations are also omitted. Other than that, 3
Reference numerals 7 and 38 show schematic internal circuits of the high-definition audio processing circuit 32.

Reference numeral 37 is a voice demodulation circuit. Although detailed internal circuit and operation explanation are omitted, a voice signal is extracted from the MUSE signal after A / D conversion, and processing such as ternary / binary conversion and time extension is performed. Then, the serial audio data signal SD and the synchronous clock CK are output. Reference numeral 38 is an audio decoder which performs processing such as synchronization detection of digital audio signals, error correction, and demodulation of differential sentence PCM signals from the data signal SD and the clock CK, and the digital audio signal M1 as described in the previous embodiment. , M2 are output.

Reference numerals 39, 40 and 41 are selectors. Reference numeral 52 is a digital audio interface input circuit for reception, which is converted into a predetermined input format. An audio data demodulation circuit 42 receives the signal XD from the input circuit 52 and demodulates an externally input high-definition digital audio data signal modulated in a predetermined format.

For example, since the audio data signal ED supplied from the external MUSE decoder 28 is biphase-mark modulated and input, the demodulation circuit 42 demodulates it and outputs the audio data signal ESD and the synchronous clock ECK. To do. Next, the operation of the above-mentioned selector will be described.

The audio data signal SD from the audio demodulation circuit 37 is led to the a terminal of the selector 39, and the audio data signal ESD from the audio data demodulation circuit 42 is led to the b terminal. The clock CK from the demodulation circuit 37 is led to the a terminal of the selector 40, and the clock ECK from the demodulation circuit 42 is led to the b terminal.

Then, the control signal C2 from the control circuit 43
Thus, the signal selection of the selectors 39 and 40 is controlled, and each selected audio data signal and clock are supplied to the audio decoder 38. The subsequent operation is as described above.
The bit stream signal output from this audio decoder is led to the a terminal of the selector 41, and the external audio data signal XD from the input circuit 52 is led to the b terminal.

Then, the control signal C3 from the control circuit 43
Thus, the selected digital data signal, that is, the bit stream signal is guided from the c terminal of the selector 41 to the b terminal of the selector 6. After that, the selectors 4, 5,
Reference numeral 6 denotes a control signal C3 from the control circuit 43, which outputs a desired digital audio signal and bit stream signal to a terminal 33,
The output to 34 and 35 is the same as in the previous embodiment.

The feature of this embodiment is that a high-definition digital audio signal from one external digital data input terminal of the high-definition receiver is converted into an audio decoder 3 inside the receiver.
By also using eight, the number of external input terminals of the receiver is reduced. Next, the control method of each selector of this embodiment will be described.

FIG. 6 is an explanatory diagram showing one specific example of the control method of the audio data output device shown in FIG. In FIG. 5, the external control signal C and the MUSE lock signal ML from the circuit 30 are input to the control circuit 43, and the control signal C2, the selector 4, the selector 4,
The fifth and sixth control signals C3 are supplied to perform the selection switching operation as shown in the table of FIG.

For example, when the external input signal C is "L", the selectors 4, 5 and 6 all select the b terminal signal, and the selectors 39, 40 and 41 all select the a terminal signal. Also,
When the signal C is "H", all the selectors select the b terminal signal. By performing such control, it is possible to appropriately select both the NTSC / high-definition broadcast signal, each digital audio signal of the external input signal, and the bit stream signal and output them to the output terminal of the high-definition receiver.

In the audio data output device of the high-definition receiver described above, as an example of the output method of FIGS. 1 and 2, an example in which an electric signal is transmitted by using a pulse transformer is shown. However, the signal transmission method is not limited to this, and there is also a method of converting an electric signal into an optical signal so as to eliminate electrical interference and to transmit with good S / N.

FIG. 7 is a block diagram showing the embodiment. FIG. 7 is a diagram in which the digital audio data transmission in FIG. 2 is performed by an optical signal. In FIG. 7, 45, 46, 47
Are electrical-optical signal converters, which convert the signals from the digital interface circuits 7 and 8 and the selector 23 into optical signals, and output optical signal connectors 48 and 4, respectively.
It is output to 9, 50.

Although not shown in the drawing, the external input terminals 25, 26 and 27 may be similarly replaced with optical signal input connectors without departing from the gist of the present invention.

Further, in the embodiment having the external input terminal shown above, as shown in FIGS. 2 and 7, the digital interface circuit 51 for reception is inserted in the input section to perform the subsequent processing. However, the subsequent selection operation may be directly performed without going through the interface circuit 51. FIG. 8 shows an example thereof.

In FIG. 8, the output terminals 15, 16, 1
7 is provided with selectors 53, 54 and 55 immediately before 7, and digital audio signals and bit stream signals for broadcast reception from the resistors 12, 13 and 14 are led to the respective a terminals, and b
Digital audio signals and bit stream signals from the external input terminals 25, 26 and 27 are led to the terminals.

By using the control signal C5 from the control circuit 56, the a-terminal signal is selected when selecting the received broadcast signal and the b-terminal signal is selected when selecting the external input signal.
The same function as that of the embodiment shown in can be realized.

Further, in FIG. 9, the second generation EDTV
The configuration of the receiver of the present invention when receiving a broadcast will be described. Reference numeral 57 is an input terminal for receiving an EDTV signal, and 58 is a UHF / VHF tuner for receiving the signal and demodulating it.
Reference numeral 59 is a second generation EDTV decoder, which decodes the demodulated signal and outputs an EDTV video signal and a digital audio signal ED1.

FIG. 9 shows the output of only the audio signal. At the same time, based on the signal from the decoder 59, the EDTV signal detection circuit 60 generates a signal EL for identifying EDTV broadcast. And the second generation EDTV digital audio signal ED1
Also, the digital audio signal N1 from the BS tuner 2 shown in the previous embodiment is guided to the selector 61, and the signal switching control of the selector 61 is performed by the EDTV identification signal EL.

The selected digital audio signal is output to the terminal 63 via the digital interface circuit 62 as in the previous embodiment. Although the switching between the NTSC signal and the terrestrial EDTV signal by the BS has been described with reference to FIG. 9, even if the input signal becomes a large number such as the MUSE signal and the external digital audio signal, the switching selection is performed in the same manner as the previous embodiment. it can. Further, although FIG. 9 shows the switching of the digital audio signal, it goes without saying that the switching selection can be made similarly for the bit stream signal.

[0073]

By using the television receiving apparatus of the present invention, two kinds of digital audio signals and bit stream signals demodulated and reproduced in both NTSC / high definition television broadcasting are shared by a common digital interface circuit and a common digital interface circuit. The number of output circuits and output terminals can be reduced to half by outputting to the output terminal.

The digital audio signal and the bit stream signal from the external input terminal can also be output from the common output terminal in the same manner, and the number of output terminals does not increase.

Furthermore, even if a single audio data signal is supplied as an external input signal, the audio decoder in the receiving device can also be used to reproduce the digital audio signal and the bit stream signal. Can be output.

As described above, even if there are plural kinds of broadcasting systems and external input signals, the digital audio signal and the bit stream signal can be selectively output with the minimum circuit scale and the number of output terminals.

[Brief description of drawings]

FIG. 1 is a block diagram showing an audio data output circuit as an essential part of an embodiment of the present invention.

FIG. 2 is a block diagram showing an audio data output circuit as an essential part of another embodiment of the present invention.

FIG. 3 is a block diagram showing another example of a control method of the audio data output device of FIG.

FIG. 4 is an explanatory diagram showing a specific example of a control method of the audio data output device of FIG.

FIG. 5 is a block diagram showing an audio data output circuit as an essential part of another embodiment of the present invention.

6 is an explanatory diagram showing one specific example of a control method of the audio data output device of FIG.

FIG. 7 is a block diagram showing an audio data output circuit as a main part of still another embodiment of the present invention.

FIG. 8 is a block diagram showing an audio data output circuit as a main part of still another embodiment of the present invention.

FIG. 9 is a block diagram showing another example of the audio data output device used in the television receiving device of the present invention.

[Explanation of symbols]

2 ... BS tuner, 3 ... MUSE-NTSC converter, 4, 5, 6, 21, 22, 23 ... Selector, 15,
16, 17 ... Output terminal, 18 ... MUSE signal detection circuit,
20 ... Control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Matono 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefectural corporation Hitachi Ltd. AV equipment division

Claims (3)

[Claims] 1. When an NTSC broadcast signal is received, it is detected, digital audio signals of a plurality of channels in the NTSC signal and bit stream signals for data channels are decoded and output to output a high-definition television broadcast signal. When received, a BS tuner that detects this and outputs a high-definition television signal, and when a high-definition television signal from the BS tuner is input, demodulates digital audio data and a clock,
Based on this, a digital audio signal of a plurality of channels and a bit stream signal for a data channel are decoded and output, and an identification signal indicating whether the input signal is a high definition television signal or an NTSC signal is output. /
A television receiver including an N converter, the digital audio signal from the BS tuner, and the M audio signal.
A first digital audio signal that constitutes the digital audio signal from the A / N converter and a first digital audio signal of the second digital audio signals are taken in, and one of them is switched and selected and output. And a second digital audio signal of the first digital audio signal and the second digital audio signal which composes the digital audio signal from the M / N converter, and a silent signal, whichever is acquired. A second selector that switches and selects one of the outputs, a bitstream signal from the BS tuner, and a bitstream signal from the M / N converter, and switches and outputs one of them. Three
Of the selector and control means for taking in the identification signal from the M / N converter and controlling selection switching in each of the selectors based on the identification signal, and converting the output from each of the selectors into a predetermined signal waveform. A television receiving device comprising: an output circuit for outputting the output. 2. When an NTSC broadcast signal is received, it is detected, digital audio signals of a plurality of channels in the NTSC signal and bit stream signals for data channels are decoded and output, and a high-definition television broadcast signal is output. When received, a BS tuner that detects this and outputs a high-definition television signal, and when a high-definition television signal from the BS tuner is input, demodulates digital audio data and a clock,
Based on this, a digital audio signal of a plurality of channels and a bit stream signal for a data channel are decoded and output, and an identification signal indicating whether the input signal is a high definition television signal or an NTSC signal is output. /
In a television receiver including an N converter, a first digital audio signal of the first digital audio signal and the second digital audio signal forming audio signals of a plurality of channels input from the outside is captured. A first external input terminal and a second external input terminal for receiving a second digital audio signal, a third external terminal for receiving an externally input bit stream signal, and a digital audio signal from the BS tuner, The M
A first digital audio signal of the first digital audio signal and the second digital audio signal which form the digital audio signal from the / N converter, and the digital audio signal from the first external input terminal. A first selector which selects and outputs any one of the fetched signals; a second digital audio signal of the first digital audio signal and the second digital audio signal which constitute the digital audio signal from the M / N converter A second selector that takes in a digital audio signal, a silence signal, and a digital audio signal from the second external input terminal and selects and outputs one of them; a bit stream signal from the BS tuner; The bit stream signal from the M / N converter and the bit stream signal from the third external terminal are fetched and one of them is fetched. A third selector for selecting and outputting, and a control means for fetching an identification signal from the M / N converter and an external selection signal input from the outside and controlling selection in each selector based on them. A television receiver, comprising: an output circuit which receives an output from each of the selectors, converts the output into a predetermined signal waveform, and outputs the converted signal waveform. 3. When an NTSC broadcast signal is received, the NTSC signal is detected and a digital audio signal of a plurality of channels in the NTSC signal and a bit stream signal for a data channel are decoded and output to output a high definition television broadcast signal. When received, a BS tuner (2) that detects the signal and outputs a high-definition television signal, and, when the high-definition television signal from the BS tuner is input, demodulates this and outputs digital audio data. First demodulator (37) for regenerating a clock synchronized with it
An M / N converter including at least an audio decoder (38) and an identification signal output means (30) for identifying whether the input signal is a high definition television signal or an NTSC signal and outputting the result. In a television receiver including (3), a single external input terminal (44) to which a serial signal including digital audio data is externally input, and a serial signal from the external input terminal (44) are provided. A second demodulator (42) for retrieving and outputting digital audio data and a clock in synchronization with the digital audio data; reproduced digital audio data from the first demodulator (37) of the M / N converter; A first selector (39) which takes in the reproduced digital audio data from the second demodulator (42) and switches and outputs either one of them.
And a reproduction clock from the first demodulator (37) and a reproduction clock from the second demodulator (42) of the M / N converter, and a second output that switches and outputs either one of them. A selector (40), fetches the digital audio data selected by the first selector (39) and the clock selected by the second selector (40), and outputs digital audio signals of a plurality of channels and data channels. An audio decoder (38) of the M / N converter that decodes and outputs a bitstream signal, a bitstream signal separated from a serial signal from the external input terminal (44), and an audio decoder of the M / N converter ( 38), and a third selector (41) for taking in the bit stream signal from , A digital audio signal from the BS tuner (2),
The first digital audio signal forming the digital audio signal from the audio decoder (38) of the M / N converter and the first digital audio signal of the second digital audio signals are taken in, and either one of them is taken. A fourth selector (4) for switching and selecting and outputting the first and second digital audio signals constituting the digital audio signal from the audio decoder (38) of the M / N converter. A second selector (5) for taking in the second digital audio signal and the silence signal, switching and selecting one of them, and outputting the bit stream signal from the BS tuner (2); A sixth select which takes in the bitstream signal output from the selector (41) of No. 3 and switches and selects one of them to output. And (6), the external selection signal input from the identification signal and external from the M / N converter identification signal output means (30) (19)
And a control means (43) for controlling selection switching in each of the selectors based on them, and an output circuit for converting an output from each of the selectors into a predetermined signal waveform and outputting the converted signal waveform. A television receiving device comprising: