JPH0316133Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a digital information recording medium, and particularly to a digital information recording medium that digitizes audio information and records it in chronological order.

There is a type of apparatus in which the above-mentioned digital information is recorded on a recording medium and the recording medium is reproduced in a reproducing apparatus, a schematic block diagram of which is shown in FIGS. 1 and 2. FIG. 1 is a schematic block diagram of a recording device for a recording medium which is the information sending side, and an audio signal to be recorded is an A/D
is digitized by an (analog/digital) converter 1. This digital signal is added with an error correction code and subjected to interleaving in the error correction processing section 2.

On the other hand, in the control signal generating section 3, various control signals and address signals required on the reproduction side are digitally coded and supplied to the multiplexer 4 together with the digital recording signal from the error correction processing section 2. A synchronizing signal from a synchronizing signal generator 5 is added to this output, and the modulator 6 modulates the signal into a signal format capable of self-clock reproduction. This modulated output is recorded on a recording medium such as a recording disk.

FIG. 2 is a block diagram of the reproducing apparatus. After the reproduced digital signal is demodulated by a demodulator 7, it is separated into a control signal including an address signal and audio digital information. This digital information is subjected to error correction in the error correction circuit 8 and then transferred to the D/A
(digital/analog) is supplied to the converter 9,
It will be returned to the audio signal.

FIG. 3 shows the state of one unit (frame) of the input signal to the modulator 6 in FIG. P are arranged in chronological order. Each word CD, D, P consists of 8 bits, and 1 bit of these 8 bits is assigned to the address signal. One block is completed with 98 frames, and this one block is the minimum unit to which an address can be assigned. The address consists of a code representing the song number of the recorded song and a timer such as minutes and seconds, and this address code is used to control the so-called random access operation of the playback device and to display the playback time on a timer.

Here, the audio information is subjected to temporal interleaving in order to add an error correction code, and is also subjected to time axis compression processing. Since the address signal is added to the interleaved digital data, the data before interleaving does not correspond to the address signal. Moreover, during playback, the reproduced signal is accompanied by temporal fluctuations due to the eccentricity of the recording disk, and although this time fluctuation is absorbed during error correction, the address signal is not absorbed, so the address signal is There is no longer any correspondence between the data and the data. Therefore, when digital still image information consisting of still image patterns such as characters, symbols, and figures is superimposed and recorded in chronological order on audio digital information, this address signal is used to locate the beginning of the digital still image information. It becomes impossible to use it.

DISCLOSURE OF THE INVENTION The present invention provides a digital information processing device that inserts an image start signal indicating the start position of the image information at the start position of a digital image information section such as a still image, and is capable of locating the correct image information. It is intended to provide.

The recording medium according to the present invention is a recording medium in which address information is added to a digital image signal section and a coded digital audio signal section, and then these are recorded in chronological order. The present invention is characterized in that an image start signal is inserted that includes at least one pair of codes corresponding to the low and high levels of the analog audio signal represented by the digital audio signal.

Embodiment An embodiment of the present invention will be described using FIGS. 4 and 5. FIG. 4 is a block diagram of an embodiment of the recording system, and parts equivalent to those in FIG. 1 are designated by the same reference numerals. Digitized characters that make up a still image,
Pattern information consisting of symbols, figures, etc. is once stored in a signal processing device 10 such as a computer, and an image start signal is added to the beginning of it, and errors are corrected every 16 bits in the same way as A/D converted audio digital signals. It is supplied to the processing section 2. At this time, the selection switch 11 selectively switches between the audio information section and the still image information section and transmits them in chronological order.

FIG. 5 is a block diagram of an embodiment of the regeneration system.
Parts equivalent to those in FIG. 2 are designated by the same reference numerals. The demodulated digital information undergoes error correction in an error correction circuit 8 and is input to a computer 12. When the computer 12 detects and identifies the image start signal, the computer 12 captures the following digital image information into a memory and outputs it to a CRT display (not shown) to display an image such as a still image.

FIG. 6 is a diagram showing one configuration example of a still image output from the signal processing unit 10, in which an image start signal and still image image data are arranged in chronological order, and the image start signal is, for example, 64 It consists of a continuous word (1 word = 16 bits) of 0000 (in hexadecimal notation) followed by two words of EFFF (in hexadecimal notation).
The former 0000 corresponds to the 0 level of the audio signal, and the latter EFFF corresponds to the full scale level of the audio signal.

Therefore, the computer 12 determines that it is an image start signal when the data of the pattern EFFF, EFFF arrives immediately after six consecutive words of 0000, and takes in the following digital data into the memory. Even if 64 words of 0000 arrive consecutively, it will not be considered as an image start signal unless a pattern of EFFF and EFFF comes next, and if 64 words of 0000 do not arrive in succession, a pattern of EFFF and EFFF will arrive. Even if it is, it is not regarded as a correct image start signal. The probability of a code signal having such a time-series pattern occurring when an audio signal is digitized is close to zero and can be ignored.

The pattern of the image start signal described above is merely an example; for example, if the code signal corresponds to a considerably high level as an audio signal,
This can be used instead of EFFF, and when recording text or graphic patterns in binary form (white and black levels), it can be used as an image start signal following a certain number of white level or black level patterns. The pattern with the highest spatial frequency, i.e.
A pattern of 101010... or 010101... can also be used. This is because such a series of patterns rarely occurs in the transmitted recorded character or graphic pattern, and the point is that the pattern has a format that cannot occur in the digital pattern of still image information to be transmitted and recorded. Any signal format is sufficient.

Effects According to the recording medium of the present invention, an image start signal containing at least one code pair corresponding to a predetermined low level and a predetermined high level as a pattern that occurs infrequently in digital audio data to be transmitted and recorded is recorded in a digital image. Since it is recorded at the beginning of the information section, it is possible to accurately locate the beginning of the digital image data of the image information section, which is preferable.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a conventional digital information recording system, FIG. 2 is a schematic block diagram of a conventional recorded digital information reproducing system, and FIG. 3 is a diagram showing an example of a conventional recording signal format. FIG. 4 is a block diagram of an embodiment of the recording system of the present invention, FIG. 5 is a block diagram of an embodiment of the reproduction system of the present invention, and FIG. 6 is a diagram showing the format of an example of the image start signal of the present invention. . Explanation of symbols of main parts, 1...A/D converter,
3... Control signal generator, 6... Modulator, 7... Demodulator, 9... D/A converter, 10... Signal processor, 11... Selection switch, 12... Computer.

Claims (1)

[Claims for Utility Model Registration] A recording medium in which address information is added to a digital image signal section and a coded digital audio signal section and then recorded in chronological order, wherein the beginning of the digital image signal section 1. A recording medium, wherein an image start signal is inserted at a position including at least one pair of codes corresponding to the low and high levels of the analog audio signal represented by the digital audio signal.