JP2002314447A - Audio processing circuit for digital broadcast signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in an audio processing circuit for a digital broadcast signal that a viewer cannot always view a program in a preferable state because the audio signal of e.g. a music program and a news report program is reproduced under the same reproduction condition, so that the viewer can view a program in a sound field space suitable for each genre of the receive digital broadcast program. SOLUTION: A microcomputer 6 stores a cross-reference table in which a genre classification code included in program arrangement information SI and a surround-setting number are cross-referenced, and outputs a command signal DIR in response to a genre classification code of a program, and an audio surround circuit 7 sets a signal processing condition of a digital audio signal according to the command signal DIR and sets a sound field suitable for a view program.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a BS digital,
The present invention relates to digital broadcasting such as CS digital and terrestrial digital, and more particularly to an audio processing circuit for reproducing audio of the digital broadcasting signal.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a configuration of a main part of a conventional digital broadcast receiver. In the figure, a tuner demodulation unit 1 receives a received signal from a BS / CS antenna, selects a station, performs quadrature detection, and then uses TC8 in BS digital.
The signal is demodulated by the PSK method and the QPSK method in the CS digital. The demultiplexer 2 selects only a video / audio packet of a desired channel from the packetized transport stream thus obtained, and further extracts necessary program arrangement information SI (Service Information).

A decoder 3 decodes each of the compressed video and audio signals based on a predetermined standard such as MPEG2, and a video DAC 4 converts the decoded digital video signal into an analog video signal to process a video signal. Output to section 5. The audio DAC 9 converts the decoded digital audio signal into an analog audio signal and outputs the analog audio signal to the two-channel speaker 10, and the decoder 3 provides a path for directly outputting the decoded digital audio signal 11 to an external device. Is provided.

[0004] The above-mentioned program arrangement information SI is based on the "BSP Association BS Digital Broadcasting PSI / SI Operation Regulations", and contains information on programs such as program names, broadcast dates and times, and program contents. EIT (Event In
formation Table). Based on this information, the following EPG (Electronic Program Guide:
(Electronic program guide) is displayed on the screen.

The EPG displays, for example, a program table up to one week ahead of a plurality of channels, displays more detailed program contents of a specific channel, and further displays a program as a movie,
It is searched and displayed according to genres such as sports and music.

[0006]

However, in the conventional digital broadcast receiver, a program can be searched for each genre by the EPG, but AAC (Advanced Audio Cording) 5.1 called "multi-stereo" is used.
Except during a channel stereo broadcast, for example, a music program and a news program reproduce sound under the same reproduction conditions, so that the program could not always be viewed in a preferable state.

An object of the present invention is to enable a user to view a program in a sound field space suitable for each genre of a digital broadcast program to be received.

[0008]

A digital broadcast signal audio processing circuit according to claim 1 digitally demodulates and decodes a digital broadcast signal containing program sequence information, and processes the digital audio signal obtained by decoding. An audio processing circuit, which is included in the program sequence information obtained by the digital demodulation and outputs a command signal corresponding to a genre classification code for classifying program contents into types; An audio surround circuit that can selectively set the content of digital signal processing based on the command signal when performing signal processing, and the digital audio of the audio surround circuit according to the program content of the digital broadcast signal. The content of the signal processing is automatically selected and set.

According to a second aspect of the present invention, there is provided an audio processing circuit for a digital broadcast signal according to the first aspect, wherein the signal processing circuit comprises: 4. The digital broadcast signal processing circuit according to claim 1, further comprising: storing a table corresponding to the digital broadcast signal, and outputting the command signal based on the table. Wherein the digital broadcast signal is a signal being received by an antenna.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a main configuration of a digital broadcast receiver including an audio processing circuit according to the present invention. In the figure, a tuner demodulation unit 1 receives a received signal from a BS / CS antenna, selects a channel, performs quadrature detection, and then uses TC8PSK in BS digital.
The signal is demodulated by the QPSK method in the CS digital system. The demultiplexer 2 selects only the video / audio packet of the desired channel from the packetized transport stream thus obtained, and further extracts the necessary program arrangement information SI.

The decoder 3 decodes the compressed video and audio signals based on a predetermined standard such as MPEG2, and the video DAC 4 converts the decoded digital video signal into an analog video signal to process the video signal. Output to section 5. The video signal processing unit 5 performs signal processing for displaying image information on a display (not shown).

An audio surround circuit 7 inputs a decoded digital audio signal and outputs a DSP (Digital Signal).
For example, 1-surround 1 (sound space suitable for watching a music program) 2-surround 2 (sound space suitable for watching a sports program) 3-surround 3 (sound space suitable for watching a movie program) 4-surround Processing off (Other) Performs signal processing for forming a sound field corresponding to the setting number of 1 to 4, and arranges the formed analog audio signal at a predetermined position, a 2-channel or 5.1-channel speaker 8 described later. Output to These surround settings are set based on a command signal DIR from the microcomputer 6 described later.

[0013] The audio surround circuit 7 is adapted to convert a program received by the digital BS broadcast into an AA conforming to a predetermined standard.
When broadcasting in C5.1 channel surround, the AAC 5.1 channel surround signal is automatically decoded, and a total of six analog audio signals including woofer signals are arranged in six speakers 8 arranged at predetermined positions.
Output to

The microcomputer 6 as a signal processing circuit inputs the program arrangement information SI extracted by the demultiplexer 2 and displays an EPG (electronic program guide) on a display screen (not shown). As described above, the EPG displays, for example, a program table up to one week ahead of a plurality of channels based on program information such as EIT included in the EPG,
View more detailed program content for a particular channel,
Further, programs are searched and displayed by genre such as movies, sports, and music.

The microcomputer 6, as shown in FIG.
A correspondence table 6a is stored in which the genre classification code of the program (0 to B: hexadecimal) is associated with the above-described surround type (indicated by surround setting numbers 1 to 4) set by the audio surround circuit 7. ing. And EI
In order to manage the genre classification of the program included in T and set the surround corresponding to the genre classification code of the program currently being received, a command signal DIR for instructing the setting of the surround setting number selected based on the correspondence table 6a is provided. Output to the audio surround circuit 7.

In the above configuration, for example, when receiving a music program of genre classification code "4", the microcomputer 6 issues a command for setting the sound space of surround 1 of the setting number "1" as shown in FIG. The signal DIR is output to the audio surround circuit 7. The audio surround circuit 7 receives the command signal DIR and executes signal processing for forming a sound field of surround 1. Then, the formed analog audio signals of a plurality of systems are output to corresponding predetermined speakers 8, respectively.

Similarly, when the microcomputer 6 receives a sports program of the genre classification code "1", for example, as shown in FIG. 2, the microcomputer 6 issues a command signal for setting the surround 2 sound space of the setting number "2". The DIR is output to the audio surround circuit 7. The audio surround circuit 7 receives this command signal DIR and executes signal processing for forming a sound field of surround 2. Then, the formed analog audio signals of a plurality of systems are output to corresponding predetermined speakers 8, respectively.

Similarly, when the microcomputer 6 receives a movie program of the genre classification code "6", for example, as shown in FIG. 2, a command signal for setting the surround 3 sound space of the setting number "3" The DIR is output to the audio surround circuit 7. The audio surround circuit 7 outputs the command signal DI
In response to R, signal processing for forming a sound field of surround 3 is executed. Then, the formed analog audio signals of a plurality of systems are output to corresponding predetermined speakers 8, respectively.

Further, when receiving a news program having a genre classification code "0", for example, as shown in FIG. The signal DIR is output to the audio surround circuit 7. In response to the command signal DIR, the audio surround circuit 7 outputs a plurality of analog audio signals formed without performing the surround processing to predetermined corresponding speakers 8.

On the other hand, when the received program is broadcast in the standardized AAC 5.1 channel surround of the digital BS broadcast, the audio surround circuit 7 automatically converts the AAC 5.1 channel surround signal as described above. A total of six analog audio signals, including those for decoding and woofers, are arranged at predetermined positions in six speakers 8 respectively.
Output to

As described above, according to the digital broadcast receiver of the first embodiment, audio signal processing that forms an optimal sound space for viewing a received program is selected according to the genre classification of the received program. For this reason, the viewer can view the received program in a sound field most suitable for the program.

In the above-described embodiment, the genre classification is set to 12 types, and the surround is set to 4 types by turning off. However, the present invention is not limited to this. According to the EIT, the genre classification is more finely divided. For example, in the case of music classification, it is possible to classify into sub-classes such as classical music, jazz music, rock music, and so on.

In the above embodiment, the surround is set in accordance with the program being received. However, the present invention is not limited to this. , The same processing may be performed.

[0024]

According to the digital broadcast signal audio processing circuit of the present invention, it is possible to select the audio signal processing for forming the optimal sound space for viewing the program according to the category of the program. Therefore, the viewer can view the received program in a sound field most suitable for the program.

According to the digital broadcast signal audio processing circuit of the second aspect, in addition to the effect of the first aspect, the configuration of the signal processing circuit can be simplified.

According to the digital broadcasting signal audio processing circuit of the third aspect, in addition to the effect of the first aspect, it is possible to form an optimal sound space for viewing a program being received.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a digital broadcast receiver including an audio processing circuit according to the present invention.

FIG. 2 is a diagram showing recorded contents of a correspondence table 6a stored in a microcomputer 6.

FIG. 3 is a block diagram showing a main part configuration of a conventional digital broadcast receiver.

[Explanation of symbols]

1 Tuner demodulator, 2 demultiplexer, 3
Decoder, 4 video DAC, 5 analog video signal processing unit, 6 microcomputer, 6a correspondence table, 7
Audio surround circuit, 8 speakers, 9 audio D
AC, 10 speakers.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/035 H04S 5/02 Y 5K061 H04R 3/00 310 H04N 7/08 A H04S 1/00 5/02 F term (reference) 5C025 AA29 BA18 BA25 BA30 DA01 DA04 DA05 5C026 DA19 DA25 5C063 AB03 AB07 AC01 AC06 AC10 CA23 CA36 5D020 AC06 5D062 BB10 5K061 AA03 BB06 BB07 CC40 CC48

Claims (3)

[Claims] 1. A digital broadcast signal audio processing circuit for digitally demodulating and decoding a digital broadcast signal containing program sequence information, wherein the digital broadcast signal is processed by a digital audio signal, the program sequence information obtained by the digital demodulation. A signal processing circuit that outputs a command signal corresponding to a genre classification code for classifying program contents according to types, and a digital signal processing based on the command signal when the digital audio signal is digitally processed And a sound surround circuit that can selectively set the contents of the digital broadcast signal, wherein the contents of the digital signal processing of the sound surround circuit are automatically selected and set according to the program contents of the digital broadcast signal. Audio processing circuit for broadcast signals. 2. The signal processing circuit according to claim 1, wherein the signal processing circuit stores a table in which the genre classification code is associated with the instruction content of the instruction signal, and outputs the instruction signal based on the table. An audio processing circuit for digital broadcast signals according to claim 1. 3. The digital broadcast signal audio processing circuit according to claim 1, wherein the digital broadcast signal is a signal being received by an antenna.