JP2002112145A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television receiver that sets a reproduction sound of sound signal sources to a prescribed level. SOLUTION: A selector 17 selects a sound signal of a BS digital broadcast when receiving a BS digital broadcast program, selects a sound signal of a BS analog broadcast when receiving a BS analog broadcast program, selects a sound signal of a ground broadcast in the case of receiving an analog ground broadcast program, selects a sound signal of a DVD in the case of reproducing a DVD 23, and selects a sound signal of a VCR in the case of reproducing a VCR 24. The sound signal selected by the selector 17 is outputted to an electronic volume 18, the level of the sound signal is adjusted by an instruction from a system controller 14, and the adjusted level is fed to an audio amplifier 19. The electronic volume 18 adjusts the level of the sound signal, so as to reach a level predetermined, depending on a selected position of the selector 17 and a memory 15 stores the control data of a level corresponding to the selected position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver capable of receiving and reproducing signals from digital broadcasts, analog broadcasts, and other signal sources.

[0002]

2. Description of the Related Art Image compression using digital signal compression technology
There is digital broadcasting that compresses audio signals and broadcasts a stream (transport stream) obtained by time-division multiplexing of video and audio digital signals of a plurality of programs via a transponder (satellite repeater). On the other hand, a broadcast receiving apparatus that receives such a digital multi-channel broadcast selects one of a plurality of transponders of the digital broadcast received through a dedicated antenna by a tuner, and selects a plurality of channels included in the one transponder. One of them is selected by demultiplex processing, and a video / audio signal is output by decoding a digital signal of the selected channel.

[0003] Such a digital television broadcast receiver is provided with a function of receiving analog broadcasts.
There has been proposed a multimedia-compatible receiver having an external input terminal to which a video / audio source such as a DVD or VCR can be connected, and selecting and reproducing those signals.

[0004]

However, the volume function in the above-mentioned multimedia-compatible receiver can only adjust the main volume, and cannot individually adjust the volume for each audio input. Was.

Further, in a receiver having a built-in digital broadcast or DVD reproduction function, digital sound reproduction enables sound reproduction with a wider dynamic range than in the past, and in practice, a difference in volume and a difference in peak level occurs for each source. ing. Furthermore, some digital audio is broadcasted and recorded on multi-channels such as 5.1ch. If the digital audio is downmixed to 2ch for reproduction by a television receiver, the center speaker is set even if a specified downmix coefficient is set. In some cases, the voice assigned to the user was too small to be heard. Further, when these digital sources are selected and then switched to normal analog broadcasting, a volume difference occurs.

In view of the above circumstances, it is an object of the present invention to provide a digital broadcast receiver that can always obtain an appropriate volume regardless of a plurality of audio signal sources.

[0007]

SUMMARY OF THE INVENTION The present invention provides a method for displaying a plurality of images / videos.
An audio signal source, a signal selection circuit for selecting one of the audio signals from the signal sources, a volume adjustment circuit for adjusting the level of the signal selected by the signal selection circuit, and an audio signal adjusted by the volume adjustment circuit The digital broadcast receiver includes a storage unit that stores a volume level, a signal controller, a volume controller, and a system controller that controls the storage unit.

[0008] According to this configuration, the levels of audio signals obtained from a plurality of signal sources do not become uneven.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIG.
The description will be made on the basis of a digital broadcast.

FIG. 1 shows a BS (Broadcasting).
FIG. 1 is a block diagram showing a broadcast receiver according to this embodiment, in which a user can view (via satellite) digital broadcasting, BS analog broadcasting, terrestrial broadcasting, DVD (digital versatile disc), and VCR (video cassette recorder).

The parabolic antenna 1 is arranged outdoors in a predetermined direction, and receives a digital broadcast signal and an analog broadcast signal transmitted from the BS.
The parabolic antenna 1 generally includes a frequency converter, and supplies a received / frequency-converted signal to the tuners 2 and 3. In addition, the terrestrial antenna receives terrestrial broadcasting and supplies a received signal to the terrestrial tuner 4.

The BS digital tuner 2 extracts a signal of a specific frequency from high-frequency digital modulation signals including video and audio data. That is, a process of selecting one from a plurality of digital broadcast transponders is performed. Further, the BS digital tuner 2 includes a deinterleave circuit, an error correction circuit, a demodulation circuit, and the like, thereby demodulating the selected digital modulation signal and outputting a transport stream.

The demultiplexer (DEMUX) 5
The transport stream received from the S digital tuner 2 is converted to MPEG2 (Moving Pict).
ure Experts Group 2) video transport packet, audio transport packet, and PSI (Program Specific I).
nformation). The demultiplexer 5 supplies the video transport packet and the audio transport packet to the AV decoder 8 and
Is supplied to the system controller 14. As described above, a plurality of channels are multiplexed in the transport stream, and a process for selecting an arbitrary channel from the multiplexed channel is performed by selecting an arbitrary channel from the PSI in the transport stream. This becomes possible by extracting data such as whether the data is multiplexed by the packet ID. Furthermore, selection of transport stream (selection of transponder)
Can also be retrieved from the PSI.

The AV decoder 8 includes a video decoder for decoding video transport packets and an audio decoder for decoding audio transport packets. The video decoder is
The input variable length code is decoded to obtain a quantization coefficient and a motion vector, and inverse DCT transform and motion compensation control based on the motion vector are performed. The audio decoder generates audio data by decoding the input coded signal. The video data generated by the decoding is output to the video processing circuit 10, and the audio data is output to the audio processing circuit 9.

The video processing circuit 10 receives video data from the AV decoder 8 and performs D / A conversion to generate a video signal. The audio signal processing circuit 9 receives the audio data output from the AV decoder 8 and performs D / A conversion to generate an analog audio signal.

The BS analog tuner 3 performs channel selection processing for selecting a signal having a frequency corresponding to the channel selected by the user and demodulation processing for performing FM demodulation on the signal having the selected frequency. Similarly, the terrestrial tuner 4 performs a tuning process of selecting a signal having a frequency corresponding to the channel selected by the user.

A video / audio processing unit 7 demodulates the received signal supplied from the BS analog tuner 3 to generate a video signal and an audio signal, and the video / audio processing unit 6 generates a received signal supplied from the terrestrial tuner 4. Is demodulated to generate a video signal. The audio signal generated by the video / audio signal processing units 6 and 7 is input to the selector 17, and the video signal generated by the video / audio signal processing units 6 and 7 is input to the selector 16. The selectors 16 and 17 are controlled by a control signal from the system controller 14, and the selector 17 includes a video / audio signal processing unit 6, a video / audio signal processing unit 7, and an audio signal from the audio signal processing circuit 9. In addition to the signals, an audio signal of the DVD 23 connected to the external input terminal 25 and an audio signal from the VCR 24 connected to the external input terminal 26 are input, and one of these audio signals is selected.

An OSD (On Screen Display) circuit 11 is provided in a signal processing system for digital broadcasting, and outputs bitmap data based on character information specified by the system controller 14 to the adder 27. The adder 27 incorporates the video signal based on the bitmap data into the video signal output from the video processing circuit 10 and supplies the video signal to the selector 16.
The OSD circuit 11 allows the system controller 14
EPG (Electronic Program) based on the service information contained in the PSI
Guide screen display (display of a program table, program details, and the like) is realized, and display of an operation menu screen related to digital video is realized. The picture tube 22 displays an image based on the image signal supplied from the CRT drive circuit 20. Further, the speaker 21 performs a sound output based on a sound signal output through the audio amplifier 19 through a process described later.

The remote control transmitter 12 is a transmitter for sending a command to the broadcast receiver. When a key (not shown) provided on the remote control transmitter 12 is operated, an infrared signal light (remote control signal) indicating a command corresponding to the key is transmitted from a light emitting unit (not shown). The remote control receiving unit 13 receives the signal light, converts the signal light into an electric signal, and supplies the electric signal to the system controller 14.

The system controller 14 is a controller corresponding to an analog broadcast receiving function, a digital broadcast receiving function, and an external input signal, and performs a program selection process by a user using the remote control transmitter 12 or the like. Further, the system controller 14 stores the information (eg, program information) separated by the demultiplexer 5 in the memory 15, controls the AV decoder 8, controls the OSD 11, and controls the selector (signal selection circuit) 1.
6, 17 control, electronic volume (volume control circuit) 18
Control.

When receiving the BS digital broadcast, the selector 16 converts the video signal of the BS digital broadcast into the drive circuit 2.
0 to select the output of the video signal processing circuit 10 to supply
At the time of receiving the BS analog broadcast, the output of the video / audio signal processing circuit 7 is selected so as to supply the video signal of the BS analog broadcast to the drive circuit 20, and at the time of receiving the analog terrestrial broadcast, the video signal of the terrestrial broadcast is converted. The output of the video / audio signal processing circuit 6 is selected to be supplied to the drive circuit 20,
3 is reproduced, the DVD video signal is selected, and
When reproducing the video signal of CR24, the video signal of VCR is selected.

The selector 17 selects a BS digital broadcast audio signal when receiving a BS digital broadcast, selects a BS analog broadcast audio signal when receiving a BS analog broadcast, and selects a BS analog broadcast audio signal when receiving an analog terrestrial broadcast. The audio signal of the terrestrial broadcast is selected, the audio signal of the DVD is selected when the DVD 23 is reproduced, and the audio signal of the VCR is selected when the VCR 24 is reproduced.

The audio signal selected by the selector 17 is output to the electronic volume 18. The electronic volume 18 adjusts the level of the audio signal supplied from the selector 17 according to an instruction from the system controller 14 and supplies the audio signal to the audio amplifier 19. The level of the electronic volume 18 is adjusted to a predetermined level according to the selected position of the selector 17, and the control data of the level corresponding to the selected position is stored in the memory 15. Accordingly, the audio signal of the DVD or VCR input through the external input terminals 25 and 26 is adjusted to an optimum value by the electronic volume 18 together with the signals from the other audio signal processing circuits 6, 7 and 9, and passed through the audio amplifier 19. It is supplied to the speaker 21.

In this embodiment, the audio amplifier 19
, The current volume is always detected, and the detection output is supplied to the system controller 14. Then, the system controller 14 constantly monitors the volume level, and when an extremely large volume level exceeding a certain set volume level is detected, the system controller 14 controls the electronic volume 18 to adjust the volume to an appropriate level. To level.

In this embodiment, a DVD and a VCR are exemplified as devices connected to the external input terminal. However, other audio reproducing devices may be used, and the present invention is also applicable to a case where a CS broadcast is received. It is.

[0026]

As described above, according to the present invention, in a multimedia compatible television receiver having a plurality of audio sources, terrestrial analog broadcasting, BS analog broadcasting, CS digital broadcasting, BS digital broadcasting, ,
The volume of a DVD or VCR connected to the television receiver can be adjusted individually.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a broadcast receiver according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 parabolic antenna 2 BS digital tuner 3 BS analog tuner 4 terrestrial tuner 5 demultiplexer (DEMUX) 6 video / audio signal processing unit 7 video / audio signal processing unit 8 AV decoder 9 audio signal processing circuit 15 memory 17 selector 18 electronic volume 19 audio amplifier 21 speaker 23 DVD 24 VCR 25 external input terminal 26 external input terminal

Claims (1)

[Claims] A plurality of video / audio signal sources; a signal selection circuit for selecting one of the audio signals from the signal sources; a volume adjustment circuit for adjusting a level of a signal selected by the signal selection circuit; A digital broadcast receiver comprising: a storage unit that stores a volume level adjusted by the volume adjustment circuit; and a system controller that controls the signal selection circuit, the volume adjustment circuit, and the storage unit.