KR100278674B1 - Apparatus for recording and reproducing digital audio data using video signal - Google Patents

Abstract

The present invention relates to a digital audio data recording and reproducing apparatus using a video signal.

The apparatus includes a memory section, a digital section, a control section and a decoder section. The memory unit stores an input analog video signal. The digital unit samples the analog audio signal to be input and A / D converts it. The controller controls the A / D-converted digital audio data output from the digital unit to be recorded in a predetermined format on the video signal stored in the memory unit. The decoder reads out the digital audio data stored in the memory unit at a higher speed at least as much as a time corresponding to the vertical retrace period of the video signal compared to the speed at the time of storing.

According to the present invention, digital audio data can be reproduced by digitally recording an analog audio signal using a device for recording an existing video signal.

Description

Apparatus for recording and reproducing digital audio data using video signal}

The present invention relates to an apparatus for recording and reproducing a video signal and an audio signal, and more particularly, to record digital audio data by compressing time on a video signal by a vertical retrace period, and to unfold the original image during reproduction. A digital audio data recording and reproducing apparatus using signals.

In general, data recording and reproducing apparatus such as a VCR is adapted to a format for recording a video signal. Therefore, a separate digital system is required to record and reproduce digital audio data. Therefore, a device capable of reproducing digital audio data using an existing video signal recording and reproducing apparatus has been desired.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to store digital audio data in a predetermined format on a video signal in a memory, and use the video signal to read out by a vertical retrace period faster than the speed at the time of storage. A digital audio data recording and reproducing apparatus is provided.

1 is a block diagram of a digital audio data recording and reproducing apparatus using a video signal according to the present invention.

2 is a diagram for explaining a method of uploading digital audio data onto a video signal.

3 is a diagram for explaining a timing format of a caption signal.

4 is a diagram for explaining a timing format of a TTX signal.

In order to achieve the above object, a digital audio recording and reproducing apparatus using a video signal including a memory unit, a digital unit, a control unit, and a decoder unit is provided. The memory unit stores an input analog video signal. The digital unit samples the analog audio signal to be input and A / D converts it. The controller controls the A / D-converted digital audio data output from the digital unit to be recorded in a predetermined format on the video signal stored in the memory unit. The decoder reads out the digital audio data stored in the memory unit at a higher speed at least as much as a time corresponding to the vertical retrace period of the video signal compared to the speed at the time of storing.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a digital audio data recording and reproducing apparatus using a video signal according to the present invention.

The apparatus shown in FIG. 1 includes a tuner 100, a voice amplifier 110, a digital unit 120, a controller 130, an image amplifier 140, a memory unit 150, and a decoder unit 160. do. The digital audio data recording and reproducing apparatus shown in FIG. 1 compresses and records digital audio data on a video signal by a vertical retrace period, and expands the original audio signal during reproduction.

The tuner 100 receives a video signal and an audio signal transmitted from a broadcasting station. The audio amplifier 110 and the image amplifier 140 amplify the audio and video signals received from the tuner, respectively. The digital unit 120 outputs digital voice data by sampling and A / D converting the analog voice signal amplified by the voice amplifier 110. The memory unit 150 stores the analog image signal amplified by the image amplifier 140. The controller 130 controls the digital audio data output from the digital unit 120 to be recorded in the format of a caption signal on the image signal stored in the memory unit. The decoder unit 160 reads the digital audio data stored in the memory unit 150 at a speed that is at least as fast as the time corresponding to the vertical retrace period 18H of the video signal than the speed at which the digital audio data is stored.

Thus, the digital audio data recording and reproducing apparatus using the video signal shown in FIG. 1 records and reproduces the digital audio data using an existing video apparatus.

Next, the operation of the apparatus shown in FIG. 1 will be described with reference to FIGS. 2 and 3.

The analog image signal amplified by the image amplifier 140 is stored in the memory unit 150 as shown in the bottom portion of FIG. 2 (the black portion is a color signal). The analog voice signal amplified by the voice amplifier 110 is sampled and A / D converted as shown in the middle of FIG. 2. The audio signal may be referred to as one-dimensional continuous signal, but the video signal may be referred to as one-dimensional discontinuous signal because it includes a vertical blanking period.

Therefore, since the signal cannot be recorded during the vertical retrace period, it is necessary to compress and record in time as the vertical retrace period, and to unfold the original shape during reproduction. To this end, the digital audio data output from the digital unit 120 under the control of the recording controller 130 is recorded on the video signal stored in the memory unit 150 as shown in FIG. 2, and is stored by the decoder unit 160 during reproduction. It is read out at a speed that is at least as fast as the time of at least the vertical retrace period (a total of 525 H on the basis of the NTSC signal and the 18H period in the odd field 9H and the even field 9H). As a result, the digital voice data is output from the decoder 160.

For example, if the speed at the time of storing in memory is 100Khz (storing 525H), when the decoder reads out, it reads 18H / 525Khz more than 100Khz. As a format for loading digital audio data in a video signal, not only a caption format as shown in FIG. 3 and a TTX (teletext) format as shown in FIG. 4 but also a new timing format may be used. In the caption format, digital voice data is carried in the data (16 bit) portion, and in the TTX format, voice data is carried in the data block (24 byte) portion. Even in caption format, it can load up to 24 bit or 32 bit by adjusting 7 cycles of CLOCK_RUN_IN 503Khz.

The present invention is not limited to the above-described embodiment, and of course, modifications may be made by those skilled in the art within the spirit of the present invention. Although an embodiment of the present invention has been described with reference to an NTSC signal, the present invention can also be applied to PAL and SECAM broadcast signals.

According to the present invention, digital audio data can be reproduced by digitally recording an analog audio signal by using an apparatus for recording an existing video signal.

Claims (2)

An apparatus for recording and playing back received video and audio signals, A digital unit for sampling the input analog audio signal and outputting A / D converted digital voice data; A memory unit for storing an input analog video signal and digital audio data output from the digital unit; A control unit which controls to record the A / D-converted digital audio data output from the digital unit in a predetermined format compressed on the video signal stored in the memory unit by a vertical retrace period of the video signal; And And a decoder unit for reading out the digital audio data stored in the memory unit at a speed higher than at the time of recording by at least a time corresponding to the vertical retrace period of the video signal. Digital audio data recording and reproducing apparatus using a video signal, characterized in that for recording and playing digital audio data using a conventional video equipment. The method of claim 1, wherein the predetermined format is Digital audio data recording and reproducing apparatus using a video signal characterized in that the caption timing format.

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