JP2776591B2 - MUSE type television signal processor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a MUSE-type television signal processing device which can include a switching device for switching to another type of television signal such as NTSC television.

2. Description of the Related Art In recent years, a processor for processing a MUSE television signal has been developed for practical use of high-definition broadcasting in the future.

Hereinafter, an example of a future MUSE signal processing device will be described with reference to the drawings.

FIG. 3 is a block diagram of a MUSE decoder in a future MUSE system television signal processing apparatus, and FIG. 4 is provided with output of an output control signal 14 from the video synchronization detection unit 4.
FIG. 5 is a block diagram of a MUSE decoder in the MUSE system television signal processing apparatus, and FIG.
FIG. 1 is a block diagram of a MUSE television signal processing device in a / MUSE dual output television receiver.

In FIG. 3, reference numeral 8 denotes a MUSE decoder. Reference numeral 4 denotes a video synchronization detection unit that detects a horizontal synchronization signal (hereinafter, HD) and a frame synchronization signal (hereinafter, FP) from the input MUSE television signal 9. The video signal portion of the MUSE system television signal is subjected to D / A conversion after performing various processes such as day emphasis, inverse Γ correction, motion processing, color processing, inverse matrix, and γ correction in the video signal processing section 5. , MUS
It is output as E video signal output 13. On the other hand, the audio signal part is separated from the video signal by the timing of HD and FP,
The signal is input to the audio signal processing A unit 1 and subjected to input gain switching, ternary / binary conversion, time expansion, inter-frame deinterleaving, and the like. Here, in addition to the audio synchronization signal, various control signals such as mode selection are detected. Reference numeral 2 denotes an audio signal processing unit B, which performs bit deinterleaving,
After performing word deinterleaving and accompanying error correction and interpolation, and further performing DPCM decoding, digital output after digital formatting or analog output after D / A conversion is performed.

FIG. 4 shows that in addition to the above configuration,
The output control signal 14 is output so that an asynchronous video output is not output.

However, in the above-described configuration, since the synchronization detection of the audio signal is performed after the synchronization detection of the video signal, the audio signal can be synchronized after the synchronized video signal is output. Until then, there is a problem that an unnatural silence period occurs.

The present invention has been made in view of the above problems, and has as its object to provide a MUSE television signal processing apparatus capable of simultaneously outputting an audio signal and a video signal in a synchronized state.

Means for Solving the Problems In order to solve the above problems, the MUSE television signal processing device of the present invention outputs an output control signal for controlling the output of a video signal and an audio signal from an audio synchronization detection unit. It is characterized by doing so.

According to the present invention, the output of the video signal and the audio signal is started for the first time when the audio signal is synchronized with the configuration described above. The synchronized video signal and audio signal can be output from the moment.

Embodiment Hereinafter, a MUSE television signal processing apparatus according to an embodiment of the present invention will be described with reference to the drawings. First
The figure shows a block diagram of the MUSE decoder section of the MUSE system television signal processing device according to the first embodiment of the present invention.

In FIG. 1, reference numeral 8 denotes a MUSE decoder, which inputs a MUSE television signal 9 and outputs an audio signal output 12 and a video signal output 13. Reference numeral 4 denotes a video synchronization detection unit, 5 denotes a video signal processing unit, 1 denotes an audio signal processing A unit, 3 denotes an audio synchronization detection unit, and 2 denotes an audio signal processing B unit. The audio and video output control signals are input from the audio synchronization detector to the final output stages of the audio signal processor and the video signal processor, respectively.

The operation of the signal processing device configured as described above will be described below with reference to FIG. The input MUSE television signal is synchronized with the video signal by detecting the synchronization signal of the video signal by the synchronization detection unit 4, then passes through the audio signal processing A unit 1, and the synchronization signal of the audio signal is converted by the audio synchronization detection unit. The detected voice is synchronized. Therefore, the audio synchronization is always performed after the video synchronization.

The output control signal is set so that the output is shut off by a UNLOCK signal indicating the last synchronization state of the audio synchronization detection unit at the time of power-on, and output is started by a LOCK signal indicating that the audio synchronization state is completed. Thus, when the audio is synchronized, the output is started for the first time. Therefore, at the start of output, both video and audio are output in a synchronized state.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows NT according to a second embodiment of the present invention.
FIG. 3 is a block diagram of a MUSE television signal processing device having a switching device for SC signals. In FIG. 2, 10 is NT
The SC audio signal, 11 is an NTSC video signal, 6 is an audio output switching device, 7 is a video output switching device, 15 is a final audio signal output, and 16 is a final video signal output.

As in the first embodiment, an output control signal 14 is output from the audio synchronization detection unit 3 to control the audio output switching 6 and the video output switching 7. The final audio signal output 15 and video signal output 16 are therefore controlled by this output control signal 14.
It can be switched between NTSC and MUSE.

In this manner, the operation similar to that of the first embodiment is performed when the reception signal is switched from the NTSC system to the MUSE system.
At the start of the output of the SE signal, the video and the audio are output in a synchronized state.

As described above, according to the present invention, in the MUSE television signal processing apparatus, a circuit for outputting an output control signal from the audio synchronization detection circuit and thereby controlling the output of the video signal and the audio signal is provided. As a result, the video signal and the audio signal can be output in a synchronized state at the start of the demodulation output of the MUSE television signal.

[Brief description of the drawings]

FIG. 1 is a block diagram of a decoder unit of a MUSE television signal processing apparatus according to a first embodiment of the present invention.
FIG. 3 is a block diagram of a MUSE system television signal processing device having a switching device for NTSC signals according to a second embodiment of the present invention, and FIG. 3 is a block diagram of a decoder portion of a conventional MUSE system television signal processing device. FIGS. 4, 5 and 6 show a block diagram of a decoder section of a conventional MUSE system television signal processing apparatus to which means for outputting an output control signal from a video synchronization signal processing section and a switching apparatus for switching to an NTSC signal. It is a block diagram of a signal output device having. 1 ... Sound signal processing A section, 2 ... Sound signal processing B section, 3
... Audio synchronization detection section, 4 synchronization detection section, 5 video signal processing section, 6 audio output switching apparatus, 7 video output switching apparatus, 8 MUSE decoder, 9 MUSE signal, Ten…
... NTSC audio signal, 11 ... NTSC video signal, 12 ... Audio signal output, 13 ... Video signal output, 14 ... Output control signal, 15 ...
… Audio output, 16… Video output, 17… HD, FP signal, 18…
... Sound synchronization signal.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiro Miyoshi 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Yuichi Ninomiya 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Inside the Broadcasting Research Institute (72) Inventor Toshiro Omura 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 7/015

Claims (3)

(57) [Claims] A video synchronization detection section for processing a MUSE television signal to detect a video synchronization signal; a video signal processing section for processing the video signal; an audio signal processing section for processing the audio signal; An audio synchronization detection unit that detects a synchronization signal for audio signal processing, and outputs an output control signal that controls whether to output a received video signal and an audio signal for the audio signal processing in the audio synchronization detection unit. A MUSE-type television signal processing device, which outputs the signal in accordance with the presence or absence of the detection of a synchronization signal. 2. The MUSE television signal processing apparatus according to claim 1, wherein the operation of the final output stage of the audio signal and the video signal is controlled by the output control signal. 3. The MUSE television signal according to claim 1, wherein the output control signal further controls the operation of a switching unit for switching to another television signal such as an NTSC television signal. Processing equipment.