JP2003153124A - Video / audio receiving device and television receiver - Google Patents

Abstract

(57) [Problem] To transmit an audio signal in a digital form by superimposing it on a video signal between a receiving device or a signal source device and a video / audio receiving device, which requires a user to perform manual operations and the like. It is necessary to have a configuration of a device without the above. SOLUTION: It is determined whether a digital audio signal is superimposed on a video signal, and if there is no digital audio signal, an analog audio signal sent separately is output. If there is, the error rate is checked. If the error rate is small, a digital audio signal is output. If there is a large number, an analog audio signal is output if it exists, but if there is no analog audio signal, a digital audio signal is output and a warning such as a cable check is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver for displaying information such as video and audio which is input and reproducing the video and audio, and for recording video and audio, for example, a VT.
The present invention relates to a recording device such as R and DVD, and a video / audio receiving device such as a switcher for re-outputting video and audio.

[0002]

2. Description of the Related Art In the field of television broadcasting, a device for recording and reproducing the same, and a package medium such as movie software, digital broadcasting has started, and a broadcasting receiving device (STB; top-bo
x), digital recording / reproducing device, HD (High Definitio)
n) Display devices compatible with the system are on sale. Packaged software used in playback devices will appear in the near future.

As is well known, information signals are subjected to processing such as data amount compression and time division multiplexing in the process of transmission or recording / reproduction, but these are restored by STB. Therefore, at least the video information is generally given to the display device in the baseband even when it is transferred digitally.

In a display device such as a television receiver, a broadcast signal, a reproduction signal of a hard disk recorder, a DVD (Digital Versatile Disc), a digital VTR, or the like is input via the STB. Therefore, a standard for transferring these information signals to and from the STB must be established.

In the North American region, EIA / C is used as a digital video baseband transmission standard for display devices for this purpose.
The standard EA861 was published in January 2000. Here, DVI1.0 (Digital Visual) which is a connection standard between the main body of a PC (Personal Computer) and a display device is used.
Interface version 1.0) is used. PC
Regarding the method of connecting the main body of the display device to the display device, for example, Japanese Patent Application Laid-Open No. 61-290529 and a digital monitor interface standard (JEI) defined by the Japan Electronic Industry Development Association
DA-59-1999), etc.,
It mainly defines in detail the method of transmitting video information. In this case, the voice information will be sent through another connection line. The voice information may be in either analog or digital format,
The other connecting line may be an analog cable, a digital coaxial cable, a digital optical cable, or the like.

[0006]

However, in consideration of usability, it is better to be able to transmit both video and audio with one set of cables. Therefore, as a method therefor, various methods have been proposed, such as superimposing a digital audio signal during a vertical or horizontal blanking period of a video signal.

Therefore, it has two interfaces, a system for transmitting a digital audio signal by superimposing it on a digital video signal and a system for transmitting an audio signal (either analog or digital format) independently of the video signal. There is a possibility that a new device will appear. In the case of such a device, the user manually uses a remote controller or the like to manually input a digital audio signal superimposed on the digital video signal,
One of the audio signals transmitted in a system different from the video signal will be selected. Which one is selected depends on whether or not the audio reproduction output is actually obtained from the speaker, etc. In that case, the user confirms from which system the audio is being transmitted while performing the switching operation. It must be done and it is inconvenient.

The object of the present invention was made in view of the above problems, and the object thereof is to improve the usability by making it possible to obtain an appropriate audio output without the manual operation by the user as described above. Another object is to provide a video / audio receiving device such as a television receiver. The video / audio receiving device mentioned here includes not only a television receiver but also a video / audio recording / reproducing device such as a VTR or a DVD, a video / audio input switching device, a video / audio dividing device and the like. .

[0009]

In order to achieve the above object, a video / audio receiving apparatus according to the present invention has a video signal on which a first audio signal is superimposed and a second audio signal, which are separate from each other. Is input to display, record or output the video signal,
In a video / audio signal receiving device capable of reproducing, recording, or outputting the first or second audio signal, means for determining whether or not the first audio signal is superimposed on the video signal is provided. An audio switching control circuit including the audio switching control circuit is provided, and the audio switching control circuit reproduces, records, or outputs the second audio signal when it is determined that the first audio signal is not superimposed on the video signal. It is characterized in that it is controlled to. Then, when the first audio signal is superimposed on the video signal, the switch is controlled so that the output signal from the D / A conversion means is preferentially selected.

The first audio signal and the video signal may be digital format signals, and the second audio signal may be an analog format signal or a digital format signal.

The voice switching control circuit may control the switch so as to supply the second voice signal to the speaker when the error rate of the digital voice signal exceeds a predetermined threshold value. Good. Further, when the error rate is higher than the threshold value and the second audio signal is not transmitted, the switch is controlled so as to select the first audio signal (the output signal of the D / A conversion means).

The power supply to the audio processing circuit including the D / A conversion means may be stopped when the switch is selecting the second audio signal. In that case, the OS
A message indicating that the first audio signal is switched to the second audio signal may be displayed by the D display circuit, for example, on the display device of the television receiver.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 is a signal generator and 2 is a video / audio receiver. Both are connected by at least two interfaces (cables etc.) indicated by 41 and 42 in the figure. In the signal generator 1, 11 is a video signal source, 12 is an audio signal source, 13 is an audio superimposing circuit, and 14 is an audio superimposing circuit.
Is a data transmission circuit, and 15 is a DAC (Digital Analogue C).
onverter). In the display device 2, 21 is a data receiving circuit, 22 is a voice separating circuit, 23 is an adding circuit, and 24
Is an image display unit, 25 is an audio processing circuit with a DAC, and 26 is
Is a switch, 27 is a speaker, 28 is a voice switching control circuit, 29 is an OSD (On Screen Display) circuit, 210
Is an auxiliary audio evaluation circuit, 241 is a display recording unit, 242 is a display output, 271 is an audio recording unit, and 272 is an audio output.

According to the present invention, first, it is automatically determined whether or not the digital audio signal is superimposed on the video signal so that the user is not required to perform a troublesome switching operation. Generally, the quality of the digital format is better than that of the analog format, so when superimposing, the digital audio signal superimposed on the video signal is selected and output. To do. Depending on the result of the determination, turn off the power of the audio signal processing circuit on the unused side,
You may save electricity. However, the determination as to whether or not the digital signal is superimposed is continuously performed.

Furthermore, even for digital audio signals, the quality deteriorates sharply when the error rate increases, and it is more preferable to output those connected in analog form. Therefore, one of them may be selected and output depending on not only the presence or absence of the superposition of the digital audio signal but also the error rate. Since it is assumed that the signal generator 1 and the display device 2 are located at a relatively short distance, it is common that no error correction is performed on the video information even when the digital information is transmitted. Since error correction is often performed on audio information having strict specifications, it is easy to realize the above-mentioned function of monitoring the error rate.

In the future, the device will be designed on the assumption that the digital audio signal is superimposed on the video signal, but even in this case, in order to make it compatible with the conventional device, the analog format is used. The present invention can be applied since the audio signal connection is considered to remain.

Further, when the audio signal to be output is switched, or when the digital audio signal is superposed, there are many errors and some kind of abnormality is considered, a message to that effect is issued. It is convenient.

With particular emphasis on the above matters, the operation will be described with reference to FIG. A video signal source 11, which is a component of the signal generator 1, generates a digital video signal, and an audio signal source 12 generates a digital audio signal.
When the signal generator 1 is an STB, this is obtained by receiving digital broadcasting, for example, and ST
It may be information reproduced from the hard disk recorder built in B. In the case of a DVD, a digital VTR, etc., the information is reproduced from the attached recording medium, and may be package software, for example.

The digital voice signal is a voice superimposing circuit 13
Then, it is superimposed on the digital video signal. There are several possible methods. For example, there is a method of superimposing the image in a horizontal or vertical blanking period. Since it is not necessary to transmit a video signal during the blanking period, it is conceivable to send a digital voice signal by using an audio signal as an audio packet instead of the video signal during that period.

The output of the voice superimposing circuit 13 is given to the data transmitting circuit 14, subjected to code conversion if necessary, and power-amplified, and then given to the display device 2 via the interface 42. The output of the audio signal source 12 is also applied to the DAC 15 to be an analog audio signal, which is applied to the video / audio receiving device 2 via the interface 41.

Next, the operation of the video / audio receiving apparatus 2 will be described with reference to the flowchart of FIG. 2 as necessary. The digital video signal input via the interface 42 is given to the data receiving circuit 21. If this has been transcoded for transmission, it is decoded here. Further, it is given to the voice separation circuit 22, where the above digital voice signal is separated and inputted to the voice processing circuit 25 with DAC and the voice switching control circuit 28. When the voice signal is not superimposed, the dummy data is given to the voice processing circuit 25 with a DAC and the information that the voice is not superimposed is given to the voice switching control circuit 28. The voice separation circuit 22 and the voice switching control circuit 28 are not separated in circuit and may be integrated, but this case is also within the scope of the present invention. On the other hand, the digital video information is added by the addition circuit 23.
The information from the OSD circuit 29 is added as described later, and then input to the display unit 24 to be displayed as an image. If the display recording unit 241 is provided, the video is recorded there, and if the display output unit 242 is provided, the video is output. The operation of the audio separation circuit 22 naturally depends on the method of multiplexing the digital audio signal. For example, if it is superimposed on the horizontal or vertical blanking of the image, the blanking timing is checked to separate them.

Next, the operation of the voice switching control circuit 28 will be described. FIG. 2 is a flowchart showing the operation of the voice switching control circuit 28, which will also be used together for the explanation. In FIG. 2, start 101 indicates the starting point of a series of operations. First, the audio superimposition determining unit 102 determines whether or not a digital audio signal is superimposed on a video signal. Several methods are known, such as determining from the format information included in the received data, or determining whether the clock of the audio signal is reproduced from the information separated by the audio separation circuit 22. If the digital audio signal is not superposed, it goes down in FIG. 2 to reach 103 and issues a command to the switch 26 to switch the connection in the opposite direction. As a result, the audio signal input via the interface 41 without being superimposed on the video signal is supplied to the speaker 27 to reproduce the audio. Voice recording unit 27
If there is 1, the voice is recorded here, and if there is a voice output 272, the voice is output there.

At this time, as indicated by 104 in FIG. 2, D
Power consumption may be reduced by not supplying power to circuit blocks that are not used, such as the audio processing circuit 25 with AC. Further, a command may be sent to the OSD circuit 29, and as shown by 105 in FIG. 2, the fact that the audio signal supplied from the interface 41 side is being output may be displayed on the display unit 24 by a message. Of course, the display may be continued for a long time, or may be erased after being displayed only for a short time. After that, the process returns to the voice superimposition determination unit 102 to continue the determination. The determination operation does not end after being performed once at the beginning so that the situation can be dealt with even if the situation changes.

Although the audio signal input through the interface 41 is described as an analog signal in FIG. 1, the present invention is not limited to this. The point is that it is sent by another interface without being superposed on the video signal, and it includes the case where the interface is a digital coaxial cable or a digital optical cable and is supplied as a digital audio signal. In that case, the DAC 15 of the signal generator 1 is removed and a DAC is placed between the interface 41 and the switch 26, or
The DAC of the voice processing circuit 25 with a DAC is separated and placed between the switch 26 and the speaker 27.

The case where the voice switching control circuit 28 determines that the digital voice signal is superimposed will be described below. The process moves from 102 in FIG. 2 to 111 for determining the error rate.
Here, the error rate of the digital audio signal that is superimposed on the video signal and input is determined. Of course, in a high error state, the quality may be worse than that entered in analog form. If the error rate is small and a certain level of quality or higher can be expected, go down from the right side of 111 in FIG. If so, decompression processing is performed here to convert it to an analog format. At 124, a command is also issued to the switch 26, and this is connected in the direction shown. As a result, the audio signal input in the digital format is given to the speaker 26 to reproduce the audio. Further, at 125, a command may be issued to the OSD circuit 29 to display a message on the display section 24 that the audio signal supplied from the interface 42 side is being output. In addition, if there are components other than the sub-audio evaluation circuit 210 from the interface 41 to the switch 26, the power supply to these components may be stopped. Then, the process returns to the voice superimposition determination unit 102 to continue the determination.

The case where it is determined at 111 in FIG. 2 that the error rate is large will be described below. Going down from the left side of 111, first, at 112, it is judged whether or not there is an audio signal from the interface 41. This is done in the sub-voice evaluation circuit 210 in FIG. Although this is often given in analog, it may be a digital audio signal given without being superimposed on the video signal as described above.
If there is, it goes from 112 to the left side, and the audio signal given from the interface 41 side is supplied to the speaker 27 through the same process as described above. This is done especially when the error rate on the interface 42 side is low and the quality of the audio signal from the interface 41 side is better. If there is no interface, the interface 42
The audio signal from is output. Go down from 112, 11
In 3, the power supply is supplied to the audio processing circuit 25 with a DAC, the separated audio signal is subjected to expansion processing and the like, and then converted into an analog format. At 114, a command is also issued to the switch 26, and this is connected in the direction shown. As a result, the audio signal input in the digital format is given to the speaker 26 to reproduce the audio. Further, although a command is issued to the OSD circuit 29 at 115 to output the audio signal supplied from the interface 42 side, there is a problem in quality, so check the looseness of the cable connection or replace the cable with a shorter one. Alternatively, a message may be displayed on the display unit 24. Also in this case, if there are constituent elements in the part from the interface 41 to the switch 26 in addition to the sub-audio evaluation circuit 210, the power supply to these may be stopped. Then, the process returns to the voice superimposition determination unit 102 to continue the determination.

The determination of the presence or absence of voice in 112 of FIG.
Not only the literal presence / absence but also the sub voice evaluation circuit 210
Then, the quality of the audio signal input from the interface 41 may be evaluated, and it may be determined after confirming that this is better in quality than the audio signal input from the interface 42. Alternatively, a certain lower limit may be set for the quality of the audio signal input from the interface 41, and when the quality is lower than this, the audio signal input from the interface 42 may be output even if the error rate is large.

When it is determined in 111 that the error rate is large, it is advisable not to immediately perform the switching operation as described above but to switch in consideration of the duration of the state. If there is a moment when the error rate deteriorates once during a long time, switching each time is troublesome. For example, when the same state continues for several seconds, it is better to switch for the first time.

As described above, it is possible to automatically select and output the high quality digital audio signal input superimposed on the video signal and the audio signal input separately from the digital audio signal. Like Further, if either of them is not present, the other party is automatically selected, but when there is a problem with the quality, a warning can be displayed. In addition, it is possible to know which is selected on the display. Furthermore, power can be saved by cutting off the power of the circuit blocks that are not used. The increase of errors in a short time has an effect of eliminating the troublesomeness of frequent switching.

Here, an example of the whole system to which the present invention is applied will be described. FIG. 3 is a block diagram showing an embodiment of the entire system used in the present invention, and shows an example of transmitting and receiving information by broadcasting and recording and reproducing. This includes the device to which the invention is applied.
1A is a broadcast receiving apparatus and corresponds to STB. 1B is a first recording / reproducing device, 1C is a second recording / reproducing device, 2A is a display device, 3 is an information providing station such as a broadcasting station, and 4 is a relay station. The first recording / reproducing apparatus 1B is built in the broadcast receiving apparatus 1A here, and for example, a hard disk recorder is often used. The second recording / reproducing apparatus 1C is externally attached to the broadcast receiving apparatus 1A, and a DVD, a digital VTR or the like is often used. Since 1B and 1C are recording / reproducing devices, the present invention can be applied even if either or both of them are not present.

The information providing station 3 such as a broadcasting station transmits a signal wave modulated by information via a relay station 4 such as a broadcasting satellite. Transmission by cable, transmission by telephone line, transmission by terrestrial broadcasting, etc. may be used. This signal radio wave received by the broadcast receiving device 1A on the receiving side is
After being demodulated into an information signal, it is recorded as a signal suitable for recording in the first recording / reproducing apparatus 1B and the second recording / reproducing apparatus 1C, if necessary. Further, it is sent to the display device 2A. The information reproduced by the first recording / reproducing apparatus 1B and the second recording / reproducing apparatus 1C is given to the display apparatus 2A via the broadcast receiving apparatus 1A. When a removable recording medium in which information is recorded in advance, for example, package software, is provided, the reproduction operation and the like in, for example, the second recording / reproducing apparatus 1C to which this is attached are performed. When performing the above-mentioned transmission, the data amount of the signal is often compressed, but this is expanded and restored to the original state immediately before the signal is given to the display device 2A. When recording on the recording / reproducing devices 1B and 1C,
It is common to record in a compressed state. Therefore, when reproducing information from these, it is first expanded via the broadcast receiving apparatus 1A and then given to the display apparatus 2A. In the portion that gives a signal from the broadcast receiving device 1A to the display device 2A, since the compression is released and the data amount is huge,
It is difficult to record.

The video / audio receiver 2 shown in FIG.
Corresponds to the display device 2A in FIG. The signal generator 1 in FIG. 1 corresponds to the broadcast receiving device 1A alone in FIG. 3 or a combination of the broadcast receiving device 1A and the second recording / reproducing device 1C. When viewing the current broadcasting on the display device 2A, the broadcast receiving device 1A except the first recording / reproducing device 1B
Corresponds to the signal generator 1. First recording / reproducing apparatus 1B
When displaying the one reproduced from, the entire broadcast receiving apparatus 1A including the one corresponds to the signal generating apparatus 1. When displaying what is reproduced from the second recording / reproducing apparatus 1C, both of this and the receiving apparatus 1A correspond to the signal generating apparatus 1.

Further, a system application example to which the present invention is applied will be described.

FIG. 4 is a block diagram showing an example in which a switcher as an example of the video / audio receiving apparatus of the present invention is used to switch between information transmitted / received by broadcasting and information reproduced by package software or the like. 1D is a broadcast receiver S
Corresponds to TB. 1E is a reproducing device, 2B is a switcher,
Reference numeral 5 is a display device, 42A and 42B are digital video signal line interfaces, and 41A is an audio-only interface.

The switcher 2B switches between the video output of the broadcast receiving apparatus 1D and the video output of the reproducing apparatus 1E such as package software, and also functions as the video / audio receiving apparatus of the present invention, and outputs good audio information for any input. You can choose. By superimposing the audio information thus obtained on the video information again, there is an advantage that the video and audio information can be transmitted to the display device 5 connected to the output of the switcher 2B only by connecting the digital video interface 42C.

[0036]

According to the present invention, since the switching of the audio signal is automatically performed, the usability is improved. Further, if the power supply is stopped for the audio signal system not selected, the power consumption is reduced.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention.

FIG. 2 is an operation flow diagram illustrating an operation of a voice switching control circuit 28 in FIG.

FIG. 3 is a block diagram showing an embodiment of the entire digital information transmission / reception recording system to which the present invention is applied.

FIG. 4 is a system block diagram using a switcher as an embodiment of the video / audio receiving apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Signal generator, 11 ... Video signal source, 12 ... Audio signal source, 13 ... Audio superimposing circuit, 14 ... Data transmitting circuit, 15 ... DAC (Digital Analogue Converter) ,
1A, 1D ... Broadcast receiving device, 1B, 1C ... Recording / reproducing device, 1E ... Reproducing device, 2 ... Video / audio receiving device, 21
... Data receiving circuit, 22 ... Sound separation circuit, 23 ... Adding circuit, 24 ... Video display unit, 25 ... Sound processing circuit,
26 ... Switch, 27 ... Speaker, 28 ... Audio switching control circuit, 29 ... OSD (On Screen Display) circuit,
2B ... Switcher, 210 ... Sub audio evaluation circuit, 241
... Display recording unit, 271 ... Sound recording unit, 3 ... Broadcasting station,
4 ... Relay station, 5 ... Display device

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 30, 2002 (2002.1.3
0)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

TECHNICAL FIELD The present invention relates to a video, is input information such as voice, and video display and audio reproduction be ruthenate revision receiver, for example, VTR records video and audio, DV
The present invention relates to a recording device such as D and a video / audio receiving device such as a switcher for re-outputting video and audio.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

The object of the present invention was made in view of the above problems, and the object thereof is to improve the usability by making it possible to obtain an appropriate audio output without the manual operation by the user as described above. Another object is to provide a video / audio receiving device such as a television receiver. Here, the video and audio reception apparatus to say, not only the television receiver, including a recording and reproducing apparatus of video and audio such as a VTR or DVD, the video and audio input switching device, also video and audio distribution amplifier such .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

In order to achieve the above object, a video / audio receiving apparatus according to the present invention has a video signal on which a first audio signal is superimposed and a second audio signal, which are separate from each other. Is input to display, record or output the video signal,
In a video / audio signal receiving device capable of reproducing, recording, or outputting the first or second audio signal, means for determining whether or not the first audio signal is superimposed on the video signal is provided. An audio switching control circuit including the audio switching control circuit is provided, and the audio switching control circuit reproduces, records, or outputs the second audio signal when it is determined that the first audio signal is not superimposed on the video signal. It is characterized in that it is controlled to. When the first audio signal is superimposed on the video signal, the switch is controlled so as to preferentially select the first audio signal.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 7/08 H04N 7/08 101 7/081 (72) Inventor Nobuaki Ko Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa 292, Machi, Hitachi, Ltd. Digital Media Development Headquarters (72) Inventor, Atsushi Yoshioka 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture F-Term, Hitachi, Ltd. Digital Media Development HQ (Reference) 5C025 AA10 BA28 CA09 CB07 DA10 5C026 DA14 DA27 5C053 FA21 FA24 GB11 GB14 GB17 JA03 JA07 JA12 LA06 5C063 AA01 AB01 AB03 AB05 AC01 AC06 CA23 CA36 DA05 DA07 DA13 DB01 5D044 AB05 AB07 BC08 CC09 DE69 FG18 GK12 HH17 HL11

Claims (18)

[Claims] 1. A video signal on which a first audio signal is superimposed,
A video / audio signal receiving apparatus capable of separately inputting a second audio signal, displaying, recording or outputting the video signal, and reproducing, recording or outputting the first or second audio signal. In the above, an audio switching control circuit including means for determining whether or not the first audio signal is superimposed on the video signal is provided, and the audio switching control circuit is configured to detect that the first audio signal is added to the video signal. A video / audio signal receiving apparatus, which is controlled so as to reproduce, record, or output the second audio signal when it is determined that the second audio signal is not superimposed. 2. The video / audio signal according to claim 1, wherein the first audio signal and the video signal are digital format signals, and the second audio signal is an analog format signal. Receiver. 3. The video / audio signal receiving apparatus according to claim 2, further comprising a separating means for separating the first audio signal from the video signal, and a first audio signal separated by the separating means. Is connected to the audio processing circuit including D / A conversion means for converting the analog signal into an analog signal and the audio switching control circuit, and one of the output signal from the D / A conversion means and the second audio signal A switch for supplying to a device for reproducing, recording, or outputting a sound selected based on a control signal output from the sound switching control circuit, wherein the sound switching control circuit outputs a first signal to the video signal. A video / audio signal receiving apparatus, wherein the switch is controlled so as to preferentially select an output signal from the D / A converting means when an audio signal is superimposed. 4. A digital video signal on which a digital audio signal is superimposed and an analog audio signal are separately input, and an image obtained by the digital video signal is displayed on a display device, and the digital audio signal is displayed. Alternatively, in a television receiver capable of outputting a sound obtained from an analog sound signal from a speaker, a sound switching control circuit including means for determining whether or not the analog sound signal is superimposed on the digital video signal. The audio switching control circuit performs control to output the audio obtained from the analog audio signal from the speaker when it is determined that the digital audio signal is not superimposed on the digital video signal. A television receiver characterized in that 5. A digital video signal on which a digital audio signal is superimposed and an analog audio signal are separately input, and an image obtained by the digital video signal is displayed on a display device, and the digital audio signal is displayed. Alternatively, in a television receiver capable of outputting a sound obtained from an analog sound signal from a speaker, a sound switching control for outputting a control signal indicating whether or not the analog sound signal is superimposed on the digital video signal. A circuit, a separating means for separating a digital audio signal from the digital video signal, and a D / A for converting the digital audio signal separated by the separating means into an analog signal.
A voice processing circuit including conversion means and the voice switching control circuit are connected, and one of the output signal from the D / A converting means and the analog voice signal is output from the voice switching control circuit. A switch for selecting the signal based on a signal and supplying the speaker to the speaker; and when the digital audio signal is superimposed on the digital video signal, the audio switching control circuit includes the D / D switch.
A television characterized by selecting the output signal from the A conversion means and controlling the switch so as to select the analog audio signal when the digital audio signal is not superposed on the digital video signal. Receiver. 6. The audio switching control circuit includes means for determining whether or not the error rate of the digital audio signal exceeds a threshold value, and when the error rate exceeds the threshold value, the analog audio signal. The television receiver according to claim 5, wherein the switch is controlled so as to supply to the speaker. 7. A video signal on which a first audio signal is superimposed,
A video / audio signal receiving apparatus capable of separately inputting a second audio signal, displaying, recording or outputting the video signal, and reproducing, recording or outputting the first or second audio signal. In, a voice switching control circuit including means for determining whether the error rate of the first voice signal exceeds a threshold value,
The audio / video signal receiving apparatus, wherein the audio switching control circuit performs control to reproduce, record, or output the second audio signal when the error rate exceeds the threshold value. 8. The video / audio signal according to claim 7, wherein the first audio signal and the video signal are digital format signals, and the second audio signal is an analog format signal. Receiver. 9. The video / audio signal receiving apparatus according to claim 8, further comprising a separating means for separating the first audio signal from the video signal, and a first audio signal separated by the separating means. Is connected to the D / A conversion means for converting the signal into an analog signal and the voice switching control circuit, and one of the output signal from the D / A conversion means and the second voice signal is controlled by the voice switching control. A switch for supplying to a device for reproducing, recording, or outputting a sound selected based on a control signal output from the circuit is provided, and the sound switching control circuit is configured such that the error rate of the first sound signal is lower than a threshold The video / audio signal receiving device is characterized in that the switch is controlled so as to preferentially select the output signal from the D / A conversion means when the above is small. 10. A digital video signal on which a digital audio signal is superimposed and an analog audio signal are separately input, and an image obtained by the digital video signal is displayed on a display device, and the digital audio signal is displayed. Alternatively, in a television receiver capable of outputting a sound obtained from an analog sound signal from a speaker, a sound switching control circuit including a means for determining whether or not the error rate of the digital sound signal exceeds a threshold value. A television receiver, wherein the audio switching control circuit is controlled to output audio obtained by the analog audio signal from the speaker when the error rate exceeds the threshold value. . 11. A digital video signal on which a digital audio signal is superimposed and an analog audio signal are separately input, and an image obtained by the digital video signal is displayed on a display device, and the digital audio signal. Alternatively, in a television receiver capable of outputting a sound obtained from an analog sound signal from a speaker, a sound switching control circuit that outputs a control signal indicating whether or not the error rate of the digital sound signal exceeds a threshold value. A separating means for separating a digital audio signal from the digital video signal, an audio processing circuit including a D / A converting means for converting the digital audio signal separated by the separating means into an analog signal, and the audio switching control circuit. Which is connected to the output signal from the D / A conversion means and the analog audio signal. And a switch that selects one of the two based on a control signal output from the voice switching control circuit and supplies the selected one to the speaker. The voice switching control circuit is configured to perform the D when the error rate is smaller than the threshold value. A television receiver, characterized in that the switch is controlled so as to select an output signal from the A / A conversion means and select the analog audio signal when the error rate exceeds the threshold value. 12. The voice switching control circuit according to claim 5, further comprising a function of stopping power supply to the voice processing circuit when the switch selects the analog signal. The described television receiver. 13. The television receiver according to claim 5, 11 or 12, further comprising an OSD display circuit,
The OSD display circuit displays, on the display device, a message indicating that the digital audio signal is switched to the analog audio signal when the switch selects the analog video signal. Machine. 14. The audio processing circuit includes a function for expanding the digital audio signal when the digital audio signal is compressed.
Alternatively, the television receiver according to item 11. 15. The television receiver according to claim 6 or 11, further comprising a sub-audio evaluation circuit for determining whether or not the analog signal is input, and the audio switching control circuit, The switch is controlled to select the digital audio signal when the error rate of the digital audio signal exceeds a threshold value and the analog audio signal is determined not to be input by the sub audio evaluation circuit. A television receiver characterized by: 16. The television receiver according to claim 15, further comprising an OSD display circuit, wherein the OSD display circuit is in a state where the error rate of the digital audio signal exceeds a threshold value and the switch is A television receiver, which displays a warning message regarding the sound quality of the digital audio signal on the display device when the audio switching control circuit is controlled to select the digital audio signal. 17. The switching control circuit controls the switch to select the analog audio signal when the state in which the error rate exceeds a threshold value continues for a predetermined period. Item 6 or 11
The television receiver described in. 18. The television receiver according to claim 15, wherein the switching control circuit suspends power supply to the audio evaluation circuit when the error rate is smaller than a threshold value.