JPS61150167A - Rotary recording medium reproducing system - Google Patents

Abstract

PURPOSE:To prevent extraction errors of a control program signal by discriminating an error in a discriminating signal due to missing of a reproducing signal and allowing a reproducing device to extract the control program signal in response to a prescribed discriminating signal. CONSTITUTION:Reproducing devices 2, 3, 5, 7, 8-11 reproduce a disc 1 to obtain a discriminating signal in the reproducing number, applies it to discriminating means A and an extraction control means B and outputs a control program signal from the reproducing signal from a terminal 13 in response to the discriminating signal. Then the discriminating means A discriminates the presence in an error of the discriminating signal due to missing reproducing signal, and the extraction control means B allows the reproducing device to extract the control program signal in response to the discriminating signal obtained in precedence when the discriminating signal on the same rotation angle location of the disc prior to the discriminating signal obtained at this time has errors depending on the result of discrimination of the means A. Thus, the missing of the control program signal is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary recording medium reproducing system, which is a rotary recording medium in which a control program signal is extracted from a reproduced signal in accordance with a discrimination signal obtained from a reproduced signal of a rotary recording medium. Regarding media playback methods.

Prior Art The present applicant previously disclosed in Japanese Patent Application No. 58-13944 and others a device such as a computer having a judgment function that is connected to the outside of a device for reproducing a disc-shaped rotating recording medium (hereinafter referred to as a "disc"). A disk in which data such as a control program signal is modulated using a self-cropping modulation method, synthesized in time series with an audio signal, and recorded along with a video signal on a spiral track in synchronization with a horizontal synchronization signal;
We have proposed a playback device that plays back this disc, generates data such as the control program from the playback signal, and transmits the data to an external device.

As shown in Fig. 2, the above disc contains four fields of video signals and two
The audio signal of the channel has been recorded. In the figure, a tracking control reference signal fP3 is recorded at the same rotational angle position indicated by solid line I, and solid line 1. Il, II
The positions indicated by 1 and 2 correspond to the vertical blanking period of the video signal, and the disk shown in the second figure rotates clockwise.

An audio signal is recorded in the first audio channel, and an audio signal is recorded in the audio second channel.
An audio signal or a control program signal is recorded on the channel. In addition, a bit (hereinafter referred to as "flag") indicating whether or not the control program is recorded in the second audio channel is provided at a predetermined position within the vertical blanking period of the video signal, and this flag is set to "1". When the control program is recorded in the second audio channel corresponding to approximately one vertical scanning period following the flag (precisely, the period from the 21st H to the 240th scanning line number), the flag is set to rOJ.
When , the audio signal is being recorded. Therefore, as shown in FIG. 3, the first to seventh and first
An audio signal is recorded in the second audio channel corresponding to the 6th to 21st fields, and a control program is recorded in the 8th to 15th fields with the flag "1".

Problems to be Solved by the Invention The playback device that plays the above-mentioned disc does not necessarily read this flag for all Vs, but for example, assumes that it reads the flag every 3. Capture the control program to be played. Here, if there is a defect in a part of the disc flag recording position, the reproduction signal will drop out (drop out) when this defective part is reproduced, that is, every 4V (one round of the disc), and the read flag will be The result will be as shown in the figure. In FIG. 3, the dropout causes the 10th. 14th. 18th゜22nd. 26th
．． No. 30. The flags in the 34th field should each be "1", but they are each rOJ. The playback device is the fourth. 7th. 10th, 13th. 16th. No. 19. 22nd. 25th degree, 28th degree. No. 31. No. 34. No. 37. Fourth
0. 43rd, 46th. When reading the flag of the 49th field and the field with an O mark above the field number in FIG. 22nd. The flag is rOJ because the 34th field has dropped out.
The regeneration devices are 10th to 12th, 22nd to 24th. 34th
~ There was a problem that the control program for the 36th field was not imported into the playback device.

Therefore, the present invention uses the determination means and the extraction control means to
It is an object of the present invention to provide a rotating recording medium reproducing method that solves the above problems.

Means for Solving the Problems FIG. 1 shows the overall configuration of the system of the present invention. In the figure, playback devices 2, 3, 5, 7, 8 to 11 play disc 1.
A discrimination signal (flag) in the reproduction number is obtained and supplied to the determination means A and the extraction control means B, and a control program signal is extracted from the reproduction signal according to the discrimination signal to the terminal 13.
Output from The determining means Δ determines whether or not there is an error in the determination signal due to a missing reproduced signal. If the discrimination signal at the same rotational angle position of the disk that precedes the current discrimination signal is determined to be incorrect, the extraction control means B uses the previously obtained discrimination signal to extract the control program. control the playback device to do so.

Operation In the system of the present invention, the determining means A determines whether or not there is an error in the determination signal, and the ejecting control means B determines whether or not there is an error in the determination signal, and the ejecting control means B determines whether or not the disc is at the same rotational angle position preceding the currently obtained determination signal based on the determination result of the determining means A. If the discrimination signal is erroneous, the reproducing device is caused to take out the control program signal in accordance with the discrimination signal obtained previously. This prevents the control program signal from being lost.

Embodiment FIG. 5 shows a circuit configuration diagram of an embodiment of a circuit to which the method of the present invention is applied. In the figure, reference numeral 1 denotes a disk, and the main information signals (video signal, two-channel audio signal) and tracking control reference signal recorded on this disk are reproduced by a pickup device 2 as high-frequency signals.

This reproduced high-frequency signal is supplied to the demodulation circuit 3, which demodulates the main information signal, which is a frequency modulated wave, of the reproduced high-frequency signal, and further band-limits this demodulated signal to convert it into a video signal and the first channel. An FM audio signal and a second channel FM audio signal are obtained. This video signal is supplied from the terminal 4 to a subsequent video signal processing circuit (not shown) and also to the flag extracting circuit 5, and the FM audio signal of the first ≠ channel is supplied from the terminal 6 to a demodulation circuit (not shown). The FM audio signal of the second channel is supplied to the demodulation circuit 7.

The control program recorded in the second audio channel has a configuration as shown in FIG. 6(A). A 1-byte framing code indicating the beginning of this data is added to the 14-byte control program, which has been interleaved to reduce the impact of burst errors, and the transmission period for 1 bit is set to 2 days, and the recorded video Signal scanning line number 21H to 260H, total 24
It is recorded every 0H period.

Further, an address signal is multiplexed on the video signal. This address signal is a chapter address signal.

Consisting of a time address signal and a track number address signal, these are the 17th H of the scanning line number and the track number address signal, respectively.
It is multiplexed in each 1H period of the 18th H and the 20th H. Here, the track number address signal is as shown in FIG. 6(B).
As shown in the figure, a fixed pattern synchronization signal is placed in the first to fourth bits indicated by 5YNC, a line identification code is placed in the next two bits, and then a line identification code is placed in the next two bits.
A voice identification code is placed on the bit. The line identification code is a code to identify the scanning line number on which this address signal is transmitted, and the audio identification code is the type of recorded audio signal (for example, stereo, monaural, bilingual, etc.)
This is the code that shows. Further, a code indicating a track number is arranged in a total of 20 bits from the 9th bit to the 28th bit, and the last bit is a parity bit.

Here, the codes indicating track numbers are 20a to 2 in the figure.
Each 4 bits shown as 0e is the track number.

It is configured to represent numerical values in the digits of 1, 100, 10, and - in hexadecimal notation. Here, the number of tracks, where one rotation of the disk is one track, is 54,000 at most in the case of a disk that can record up to 60 minutes on one side. Therefore, 2
The maximum value of the 4-bit value indicated by 0a is "5" in hexadecimal notation, which is rololJ in binary, so it is 20
It can be seen that the most significant bit of the 4 bits indicated by a, that is, the 9th bit of the track number address signal (shown with diagonal lines in the figure) is always "0".

Therefore, the 1st bit of the 9th bit is used as a flag to determine the presence or absence of multiple recording of the control program signal, and when this flag is "1", the scanning line number is The second voice over a period of 240H.
Indicates that control program signals are multiplex recorded on a channel.

Returning to FIG. 5, the flag extraction circuit 5 discriminates and separates the address signals multiplexed on the supplied video signal, and furthermore, the flag extraction circuit 5 discriminates and separates the address signals multiplexed with the supplied video signal, and
The bit-th flag is extracted every 3V, for example, and the flag taken in the middle is supplied to the CPU 8. Further, the demodulation circuit 7 demodulates the supplied FM audio signal of the second audio channel and supplies it to each of the switch circuits 9 and 10. Each of the switch circuits 9 and 10 is supplied with a switching control signal from the CPU 8, and the switch circuit 9 receives a switching control signal of H.
Only at the level, the modulated wave of the control program signal multiplexed on the second audio channel from the demodulation circuit 7 is taken out and supplied to the decoder 11. The decoder 11 demodulates the control program modulated using a self-clockable modulation method, and supplies the resulting digital control program signal to the CPU 8. In addition to flag processing as described below, c'pus performs processing such as dinterleaving and error correction on the control program signal, returning the control program to its original form before being recorded on the disk, and then converting the control program signal to the original format. Output from terminal 13. Further, the switch circuit 10 takes out the audio signal of the second audio channel from the demodulation circuit 7 and outputs it from the terminal 12 only when the switching control signal is at L level.

Next, flag processing by the CPU 8 will be explained with reference to the flowchart shown in FIG. CPUB contains variables F(1) to F■ for storing flags, and variable G( for storing error data).
1) to G■ and a variable date for outputting a switching control signal are provided. Note that these variables are reset to zero when the power is turned on.

The CPLJ 8 executes the process shown in FIG. 7 when a flag is supplied from the flag extracting circuit 5 every three seconds. First, the variable FC
4), F(31, F■, F(1) respective values as variable F■
.

Shift to F(4), F■, F■, respectively, and similarly change the variable G(
4), G(31, G■, G(1)) respectively as variable G(
5).

Shift to G(4), G■, G■ (step 30
). Next, the flag from the 7-lag extraction circuit 5 is set to variable F(1).
The value rOJ is stored in step 31), and the value rOJ is transferred to variable G(1) (step 32).

After this, the values of the variables F(1) and F■, that is, the values of the flag obtained this time and the flags obtained last time (3V ago) are compared (step 33), and when they match, the process moves to step 34, If they do not match, the process moves to step 35. In step 34, it is determined whether the value of variable 00 is "0", and if this is "1", the process moves to step 40, and "O
”, the process moves to step 36. The above-mentioned variable G■ stores error data for a flag obtained at the same rotational angle position on the disk three disk revolutions earlier, that is, 12 V earlier than the currently obtained flag. The value of variable G■ is rO
When it is J, it indicates that there is no error in the flag 12V before, and when it is "1", it indicates that the flag 12V before is erroneous. That is, in this case, of the previously obtained signals for determining an error, only the one 12V earlier, which corresponds to three revolutions before the disk 1, is used. However, it is not limited to this, and 12V, 24V
It is also possible to use a combination of the previous ones, and for example, when reading flags every 2V, it is possible to use the previous one 4⋅. In other words, the signal for determining the previously obtained error is created from the currently obtained flag and the time series of past information obtained at the same rotation angle of the disk. In step 36, the value of variable F(1), that is, the flag obtained this time, is transferred to variable H. Thereafter, in step 37, the value of the variable H is supplied as a switching control signal to the switch circuit 9.10 shown in FIG. 5, and the process ends. In step 40, the inverted flag value F(1) obtained this time is transferred to the variable H, and the current and previous data are determined to be incorrect, and the variables G(1) and G■ each have the value [1]. be transferred. After this, the process moves to step 37.

Further, in step 35, the values of the variables F■ and F(31 are compared, and when they match, the process moves to step 39,
Here, the signal F(1), which is the inverted value of the variable F(1), is transferred to the variable H, and the current flag is determined to be correct. After this, the process moves to step 37.

If they do not match, the value [1J is transferred to the variable G■, and the flag obtained this time is transferred to the variable H. (Step 38)
. After this, the process moves to step 37.

This is because when the control program is multiplexed, it is multiplex recorded over a period of at least 3V,
■Three flags obtained in succession every time are “l0IJ,
r0IOJ will never occur, and in such a case, the flag obtained last time is determined to be incorrect.

Here, the video signal reproduced from the disc is shown in Fig. 4 (A
), the value of the flag extracted in the 22nd field is "0", and this is transferred to the variable F(1) in step 31 shown in FIG. In this case, the flag obtained this time is considered to be incorrect and step 3
2.33.35°39.37 are executed sequentially. The value of the variable H output at this time is "1", and the switching control signal output from the CPU 8 is at H level. In this way, the output switching control signal during the period of the 7th to 45th fields shown in FIG. The original control program is converted into the original control program and outputted from the terminal 13. Therefore, as in the past, the 10th to 12th. 22nd to 24th. The control programs for the 34th to 36th fields will not be missing.

Moreover, if the process of the flowchart shown in FIG. 7 is executed,
As shown in FIG. 4(B), the 19th. Even if a flag of value rOJ is obtained consecutively with the 22nd field,
This can be corrected.

By the way, in the method of the present invention, the control programs for the 4th to 7th fields shown in FIG. The present invention is suitable for a reproducing apparatus that reproduces a disc in which dummy programs such as non-operation instructions are recorded in at least the fourth to seventh fields and at least the forty-first to forty-eighth fields. Regarding disks with such dummy programs added, Patent Application No. 1 filed on November 20, 1980 with the applicant
The invention is proposed under the title "rotating recording medium."

Effects of the Invention As described above, since the method of the present invention is constituted by the determination means and the extraction control means, even if an error occurs in the determination signal due to the omission of the reproduction signal of the rotating recording medium, there is no problem in extracting the control program signal from the reproduction signal. It has features such as being unaffected and preventing errors in extracting control program signals.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall configuration of the system of the present invention, FIG. 2 is a diagram showing an outline of a track pattern of an example of a rotating recording medium, FIG. 3 is a diagram showing an example of a signal recording form of a rotating recording medium, and FIG. FIG. 4 is a diagram showing an example of a flag reproduced from a rotating recording medium, FIG. 5 is a block diagram of an embodiment of a circuit using the method of the present invention, and FIG. 6 is a diagram showing control program signals and track number addresses, respectively. FIG. 7, which is a diagram for explaining the configuration, is a flowchart of an embodiment of processing executed by the CPU shown in FIG. 1... Disk, 5... Flag extraction circuit, 7...
Demodulation circuit, 8...CPU, 9.10...Switch circuit, 11...Decoder, 30-40...Step.

Claims (1)

[Claims] A control program signal for a device connected to the outside of the playback device is synthesized with an audio signal in time series, and the control program signal is combined with an audio signal in a spiral or spiral manner along with a video signal on which a discrimination signal for determining whether or not the control program signal is recorded is superimposed. In a rotating recording medium reproducing method in which a rotating recording medium recorded on concentric tracks is reproduced and the control program signal is extracted according to the discrimination signal, the discrimination signal is reproduced due to a missing reproduction signal of the rotating recording medium. a determination means for determining the presence or absence of an error; and a determination signal obtained at the same rotational angle position of the rotating recording medium prior to the currently obtained determination signal is determined to be an error by the determination means. 1. A rotary recording medium reproducing method comprising: a retrieval control means for retrieving the control program signal in accordance with a discrimination signal obtained previously.