JPH0614274A - Television receiver - Google Patents

Abstract

PURPOSE:To easily watch a part of the program which one missed by holding a video signal and a voice vibration temporarily in a memory section before finally outputted and displayed after demodulated in a video/voice signal demodulation section. CONSTITUTION:A signal received by an antenna3 10 is first inputted to a signal receiving section 11 of a video/voice signal demodulation section 1, further, the video signal is demodulated by a video signal demodulation section 12 and the voice signal is demodulated by a voice signal demodulation section 13 respectively. Then, the demodulated video and voice signals are written in a memory section 3 where they are read out after the time-shift by a certain time (TD). The video and voice signals time-shifted by the time TD are inputted to the video/voice signal output section. The video signal is outputted and displayed via a video signal output section 14 through a monitor 16 and the voice signal via a voice signal output section 15 through a speaker 17. With the use of an optical-magnetic disk with the capacity of several hundreds of MB, the TD time can be shortened to several minutes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver having a memory function capable of holding a video signal and an audio signal for a certain period of time, and time-shifting and outputting the video signal and the audio signal for the period of time retained. It is a thing.

[0002]

2. Description of the Related Art A conventional television receiver is roughly divided into two blocks, a video / audio signal demodulating section 31 and a video / audio signal outputting section 32, as shown in FIG. In this case, the television signal input from the input terminal 30 is demodulated into a video signal and an audio signal by the video / audio signal demodulation unit 31, and further input to the video / audio signal output unit 32. The video / audio signal output unit 32 outputs a video signal and an audio signal in real time, and the monitor 33 outputs the signals.
And is finally output and displayed via the speaker 34.

[0003]

In the conventional television receiver configured as described above, when the program the viewer is watching is missed for a certain time, the V
Unless recorded in TR etc., it cannot be seen again.

Further, even if it is recorded on a VTR or the like, it is very troublesome to wait until the end of the program and to re-examine the part that was missed again.

[0005]

Therefore, a memory unit capable of holding video signals and audio signals only for the missed time (TD) is provided, and at the same time the demodulated video signals and audio signals are sequentially written into the memory unit. By sequentially reading out the video signal and the audio signal written before the TD time,
The video signal and the audio signal themselves are time-shifted by the TD time.

The memory capacity can be reduced by subjecting both the demodulated video signal and audio signal, or only the video signal, to compression processing and decompression processing before writing and after reading, respectively. Alternatively, the time interval TD that can be held can be lengthened.

[0007]

With this memory function, even if the viewer misses the program he / she was watching for TD time and starts watching the program again, the program itself is time-shifted and output by the TD time. You can watch it without missing it.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the television receiver of the present invention will be described below with reference to FIG.

In the television receiver according to the present invention, as shown in FIG.
The signal is input to the signal receiver section 11 of the audio signal demodulation section 1, and the video signal is demodulated by the video signal demodulation section 12 and the audio signal is demodulated by the audio signal demodulation section 13.

Next, the demodulated video signal and audio signal are written in the memory section 3, time-shifted by a certain time (TD), and then read. The video signal and the audio signal time-shifted by the TD time are input to the video / audio signal output unit 2, the video signal passes through the video signal output unit 14, the audio signal passes through the audio signal output unit 15, and the monitor 16 and the speaker respectively. The output is displayed via 17.

FIG. 2 shows another embodiment of the television receiver of the present invention.

In another embodiment of the television receiver of the present invention, a compression processing unit 21 and a decompression processing unit 22 are added before and after the input and output of the video signal memory unit 3. As the signal compression / expansion processing, for example, processing conforming to the JPEG basic system is performed.

In general, the data amount of the signal is reduced to 1/10 to 1/20 by this compression processing. Therefore, the memory capacity of the memory unit 3 can be reduced in proportion to this. On the contrary, if the memory capacity is constant, the holdable time interval TD can be lengthened in inverse proportion to this.

As a method of constructing the memory unit 3, a memory device such as a DRAM or SRAM is used.

A rewritable disk medium is used.

Several methods are possible, such as When the TD is extremely short, a cost / hardware configuration method is preferable, but when the TD is lengthened, a large-capacity hard disk or magneto-optical disk is used together with compression and expansion processing. A method is also possible.

Paying attention only to the video signal of the NTSC signal, digitally sampling this video signal at 4 fsc,
When demodulated into 4: 2: 2 Y, P _B , and P _R signals, the effective data amount is about 22 MB / sec.

Further, 1/2 of these Y, P _B and P _R signals
When the compression process of 0 is applied, the data amount is about 1.1 MB / s.
It becomes ec.

When one DRAM having a capacity of 4 Mbit is used to hold this compressed signal, the holding time TD is TD = 4M / (1.1M × 8) ≈0.4
It will be 5 seconds.

If the TD is 5 minutes (= 300 seconds), the required memory capacity is 1.1M × 300 = 330.
It becomes MB.

By controlling the writing and reading of the memory portion, the holding time TD can be easily changed within the range of the maximum value or less.

If a magneto-optical disk having a capacity of several hundred MB is used, the system of the present invention having a memory function of several minutes can be realized.

[0023]

Since the television receiver of the present invention has the above-mentioned structure, it can output the demodulated video signal and audio signal by time-shifting by a certain time.
You can easily watch some of the missed programs.

Further, by utilizing this memory function, the freeze or repeat display of the input video signal or arbitrary image can be easily realized.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing an embodiment of a television receiver of the present invention.

FIG. 2 is a principal block diagram showing another embodiment of the television receiver of the present invention.

FIG. 3 is a main part block diagram showing an embodiment of a conventional television receiver.

[Explanation of symbols]

 1 video / audio signal demodulation unit 2 video / audio signal output unit 3 memory unit 11 signal reception unit 12 video signal demodulation unit 13 audio signal demodulation unit 14 video signal output unit 15 audio signal output unit

Claims (3)

[Claims] 1. A video / audio signal demodulation unit for demodulating a received television signal into a video signal and an audio signal, and the video / audio signal demodulation unit.
A television receiver comprising: a memory unit for temporarily holding the video signal and the audio signal after being demodulated by the audio signal demodulating unit and before finally being output and displayed. 2. The television receiver according to claim 1, wherein the memory section has a function of sequentially writing and reading the demodulated video signal and audio signal. 3. The memory section, after writing the demodulated video signal and audio signal, after compressing both the video signal and the audio signal or only the video signal to reduce the data amount. 2. The television receiver according to claim 1, wherein the signal subjected to the compression processing is subjected to the expansion processing after the writing is performed and the reading is further performed.