JPS62192934A - Information reproducing device - Google Patents

Abstract

PURPOSE:To cope with missing of information by moving relatively a sensor and an information recording medium in a direction corresponding to a direction nearly orthogonal to the lengthwise direction of an information track of the medium, outputting a read signal properly from the sensor and counting number of times of signal outputs. CONSTITUTION:A sensor array output counter circuit 322 counts the number of times of read signal outputs of the sensor array 10, after a pair of R lines relating to an information track is detected first, the recording information of the information track is reproduced, a pair of R lines is not detected once and a pair of R lines relating to other information track again is detected first. Its output signal 323 is inputted to a divider 324, where division is execut ed. The output signal 325 represents the information track number passing through the sensor array 10 at each count. Then the output signal 325 is inputted to a track number counter circuit 326, which calculates the output signal 325 and a track number signal is outputted from the counter circuit 326.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for reproducing information recorded on an information record carrier. The present invention is suitably applied, for example, to information reproduction using optical means.

[Background of the invention]

In recent years, information has been reproduced using optical information recording carriers such as optical files and compact discs. Furthermore, recently, information reproduction using card-shaped optical information record carriers (hereinafter referred to as optical cards), which are more portable than these record carriers and have a relatively large capacity, has begun to attract attention. .

FIG. 2 is a schematic plan view showing an example of the recording format of an optical card.

In the figure, a recording area 2 is provided on an optical card 1 which is a record carrier, and the recording area 2 is formed by a plurality of bands 3 arranged. Further, each band 3 is formed by arranging a large number of information tracks 4, and each track 4 has an information capacity of several tens to 00 bits.

Further, each band is separated by a reference line (hereinafter referred to as R line) 5. Note that arrow A is the moving direction of the optical card 1 during reproduction, and arrow C is the 11''r information reading scanning direction by the optical head during reproduction.

FIG. 3 is a schematic diagram of an apparatus for reproducing an optical card having the following recording format.

In the same figure, the optical power door 1 is moved by an arrow A by a rotation mechanism 6.
It is possible to move back and forth in the direction. Information recorded on the optical card 1 is read and reproduced by the optical head 11 as well as the I-rack. First, light from a light source 7 such as an LED is focused by a lens system 8 to illuminate the optical cart 1. An image of the track of the optical card 1 is formed by an imaging optical system 9 onto a one-dimensional sensor array 1°. As the optical card l moves in the direction of the arrow A, the image of the information track on the sensor array 10 changes accordingly. sensor array 10
In this case, while each rank of information is imaged on the sensor array 10, reading scanning is performed several times. In this way, the recorded information of several information tracks in a certain hunt is reproduced, and when this is completed, the optical
1;] l moves appropriately in the direction of arrow C and connects with other rl's information! - The rank is imaged on the sensor array, and the recorded information is reproduced in the same manner as above.

FIG. 4 is a schematic enlarged view of the recording format i section of the optical cart 1 shown in FIG. Note that the shaded area in the figure represents information "1", and the blank area represents information "'0".

Figure 4 shows the optical power - in the six directions of arrows in the recording area of F1.
・It indicates the end. In the figure, reference numeral 201 is an information rack area, and in this area, one row of information columns in the direction of arrow C corresponds to one information track. 202
is the R line, and the R line and the information track area 20
1 and 1 form a bread]'-203. In addition, 204
is the unit data 9n area of the information track and consists of 5 bits.

The taunting track is like this (a set of 1st data areas). “0”, and the central 4-bit 1-min is a striped 1n signal whose width in the six directions of the arrow is shorter than 1-bit.
”, and each stripe is arranged corresponding to each information 1-rack.

The reading operation of the information track by the sensor array 10 is as follows:
By detecting the information "011110" on the R line 202, it is determined that the alignment with the information track has been set correctly, and the process is started.

Next, the optical power -)・'1 moves in the six directions of the arrows with respect to the optical head 11, and then the information on the R line ゛01111.0
” disappears and the information “000000” is obtained, and then the information “011110” appears again, so it is determined that the next information track has been moved, and the same reading as above is performed. In this way, the R line 202 is an area for separating and identifying tracks adjacent in the C direction, and is also an area for separating and identifying tracks adjacent in six directions.

In order to reproduce information from an optical card having the recording format as described above over a plurality of pans 1, the information tracks of each band are sequentially reproduced while moving the optical head II in the C direction. At this time, the target band 2
It is necessary to control the position of the optical head 11 so that the image of the information track is within the effective reading range of the sensor array 10 over the entire range of 03. This control of the optical head position is performed by controlling the R of the LI band within a predetermined range of the sensor array 10.
This is done to locate line 202.

-1 Each unit data area 204 of the second information track is composed of 5 bits, and the data to be stored is converted by 415 according to the conversion law shown in the following table, and is further modulated by NRZ1 and recorded.

FIG. 5 is an explanatory diagram of the 415NRZI modulation method. As shown in the figure, the hexadecimal data Eφ is converted by 415 and further NRZI modulated, but the signal recorded by the NRZ+ modulation method includes only signals with lengths of T, 2T, and 3T. Here, T is the minimum signal inversion interval, and corresponds to 1 bit in the recording format I shown in FIG. That is, the information recorded in the information track area 201 does not include an inversion interval of 4T or more.

Therefore, a separation area (i.e., R line) 20 for separating and identifying information tracks has an area having an inversion interval of 4T.
It is used as 2. That is, the R line 202 is
It has a length of 6 bits in terms of direction, and 1 bit on each side, 2 bits on both sides are information "0", and the 4 bits in the center
The width of the bit width in the direction of arrow A is shorter than 1 bit (
For example, about 1/2) is striped information "1". In this way, a region of the separation signal "011110" having an inversion interval of 4T in the direction of arrow C is formed. Of course, the information is not limited to this, and the information may be recorded in such a way that it can be distinguished when read.

In this way, since the separated region 202 includes consecutive identical codes that do not appear in the information track, the R line can be detected reliably.

Furthermore, in the R line 202, the strip width of the information "1" in the center 4 bits in the direction of the arrow C in the arrow direction is shorter than 1 bit, so the information track and the one-dimensional sensor are Even if the parallelism of the corresponding areas read by the array 10 is off, if the separation signal "011110" of the R line 202 is completely read on the one-dimensional sensor array 10, the entire one-dimensional sensor array 10 is on the same information track. It is guaranteed that it corresponds to

Next, an example of a method for reproducing information from the information recording carrier will be described. Here, an optical card is taken up as an information recording carrier having the recording format shown in FIG. 4, and a reproducing device shown in FIG. 3 is used as a device for reading information from the optical card. Furthermore, as shown in FIG. 7, the optical magnification is selected here so that 1-pill 206 in the recording area of the optical card is imaged onto four cells 207 of the one-dimensional sensor array 10. . For example, one of the optical cards
If the size of the bit 206 is 10 μm and the size of the cell 207 of the -dimensional sensor array 10 is 15 μm, then 4×1
The imaging optical system 9 may be provided with a magnification of 5/10=6 (times).

FIG. 8 is an explanatory diagram showing a method for reproducing an information recording carrier.

In the figure, there is a band 203 in the recording area on the optical card.
and hands 203a and 20 adjacent to band 203
3b and each hand's information track 21°218.21b
and a separation area 202 for separating each information track.
202a and 202b are formed in the format shown in FIG. Here, the tracks of the band (2) are formed of a separation area (6 bits/nodes) and an information track (80 bits/1-), totaling 86 bits/nodes. Therefore, one band of tracks corresponds to the sensor array 10. In J2, images are formed on 344 cells 207.

Therefore, here, CC with 512 cells 207
D as a one-dimensional sensor array 10, information adjacent to the information track 21 to be read, track 21a
The reading area 208 is set so that a part of the sensor array 20 and 21b is also imaged onto the sensor array 10.

Furthermore, -dimensional sen (separation region 20 on the no array
2 from the signal read area 208 and information track 21
You can know the relative position with.

FIG. 9 is a block diagram showing an example of a device for reproducing information on an optical cart.

In the figure, the sensor array 10 having the reading area 208 is driven by the sensor array 1 driver 306.
The output signal 308 is amplified by the same <1' controller 306 and input to the binarization circuit 310 as a video signal 309. Binarization circuit 310
The video signal binarized by NRZI (A No. 31.1
The signals are input to the clock recovery circuit 312, the N RZ l demodulation circuit 314, and the R line detection circuit 316, respectively.

The clock signal 313 is extracted from the NRZI signal 311, and the clock signal 313 is output from the NRZI borrow demodulation circuit 3.
Output to 14. The NRZI demodulation circuit 314 inputs the clock signal 313 and the NRZI signal 311 and outputs the NRZ signal 315, which is a demodulated signal, to the 5/4 conversion circuit 320. On the other hand, the R-in detection circuit 31G is the frequency divider circuit 3
17, the drive clock 307 is frequency-divided, and the I-1 clock 318 is divided, and further from the binarization circuit 310, N +-,!
The ZT signal 311 is inputted, and the R line detection signal 319 is outputted to the 5/4 conversion circuit 320. 5/4
According to the R line detection signal 319, the conversion circuit 320
The NRZ signal 315 is 5/4 converted.

The tenth leap is a block diagram of the R line detection circuit 316 marked -1-. In the same figure, NRZI (g-signal 311) is input to the serial input terminal of the shift register 401, and clock signal 318 (4 times hardness minus 9) is input to the clock input terminal.
But it's all about human power. In addition, 6 bino 1- of the shift register 401
) 1 (r column output terminal A is connected to the input terminal of the -number circuit 4020 of '011110''. -number circuit 4
If the coincidence signal of 02 is 5/4 as the R line detection signal 319
It is output to the conversion circuit 320. In addition, the goose string output terminals of shift 1 to register 401 of [i hit] are “ooooooo
" are respectively connected to the input terminals of the - number circuit 403. A match signal 321 is obtained from the - number circuit 403.

The specific operation of the reproducing apparatus having such a configuration will be explained with reference to FIGS. 4 and 8.

When the sensor array 10 is driven and the reading area 20B is scanned in the direction of the arrow B by the sensor 307, the NRZ
l(L'j 311, a signal for reading information on a part of the information track 21a appears. As described above, this signal has an inversion interval of T in principle.

Since it is 2T or 3T, it is possible to reproduce the LJ sock signal 313 by using a PLL circuit or the like or by extracting the minimum inversion interval of 1'' by the 17 sock reproducing circuit 312. Using this clock signal 313, the NRZ signal 311 is demodulated into an NRZ signal 315 by a demodulation circuit 314. However, the 5/4 conversion circuit 320 does not operate unless the first R line detection No. 5 319 is input. Of course, the shift register 401 of the R line detection circuit 31G is inputted with each bit number in the reading area 208 in order of llji, and is always filled with signals for 6 hisoj. Therefore, the stored contents of shift 1 to register 101 are the recorded contents of separate area 202 or register 202b.
”, the R line detection signal 319 is not output.

6-bit information of the first separation area 202 ta"'0111
10" is stored in the shift] register 401, the R line detection signal 319 is output from the minus number circuit 402, and the 5/4 conversion circuit 320 starts the conversion operation. Therefore, the information to be read is The NRZ signal 315 corresponding to the information of the track 21 is converted into 5/4 and outputted as a re-1 signal.

Then, the information of the next separation area 202b" 01111
0" is stored in the shift register 401, the R line detection signal 319 is output from the minus number circuit 402, and 5/4
The conversion circuit 320 stops outputting the repeat signal.

In this way, the information reproduction of the information rack 21 to be read is executed by the self-clock. Similarly, a desired information track is selected as a reading target by moving the optical card in the direction of arrow C and/or moving the optical head 11 equipped with sensor array 10 in the direction of arrow C, and the information is reproduced.

Incidentally, since the movement of the sensor array 10 and the relative movement of the optical card with respect to the sensor array 10 are performed asynchronously, the scanning speed of the sensor array 10 in the direction of arrow B and the movement speed of the optical card in the direction of arrow A are different. Depending on how you choose
One piece of information] - A rack may be scanned multiple times.

For example, if the frequency F of the clock 307 that drives the sensor array 10 with 512 cells is 10 M1lz, the moving speed of the optical card is 4 Q mn/sec, and the size L of 1 pin 1- of the optical card is 10 pm. - The number of scans S per information track is: S=L/VX 1/ (1/Fx 512) = 4.8
It becomes 8. Therefore, it is necessary to detect that the optical card has moved to the next information track. This is done as follows. That is, the - number circuit 403 is connected to the isolation region 202.
Alternatively, when detecting the recorded content "oooooo" of 202b, a match signal 321 is output. Therefore - number circuit 403
After detecting the coincidence signal 321 from the R line detection signal 319
You can know that you have moved to a new track by getting .

The above example shows the case where the modulation method is 415NRZI modulation method, but any modulation method that allows self-clocking that requires an area for obtaining a clock for information reproduction, such as MFM or EFM conversion method, can be used similarly. Applicable to Furthermore, the system is not limited to the self-clock system, and a signal area (preamble) for extracting a reproduction clock may be provided within the hand.

[Purpose of the invention]

By the way, in the above-mentioned regeneration method, the information reproduction signal is output only when the R line is detected, so if the optical card is scratched or has dust attached to it, or even if the R line is not connected during manufacturing. If there is a defect, it becomes impossible to detect the R line, and thus not only cannot the reproduction information of the information track be obtained, but also it cannot be known that the information track has not been reproduced.

1, for example, if the information error correction method in an optical card is performed by grouping multiple information tracks into one block, the correction process for the reproduced information will be insufficient and erroneous information will be obtained. This may cause serious problems. Furthermore, when the information recorded on an optical card constitutes one piece of information by a collection of multiple information tracks, such as image information or audio information,
A problem may occur in which images, audio, etc. are out of synchronization due to lack of information.

Therefore, even if the R line cannot be detected and therefore the information track is not reproduced, the present invention makes it possible to know that the reproduction has not been performed, thus making it possible to deal with information loss. The purpose of the present invention is to provide an information reproducing device for

[Summary of the invention]

According to the present invention, the above-mentioned object is to reproduce information using a sensor from an information recording carrier in which information tracks formed by one-dimensionally arranging information are arranged in a direction substantially perpendicular to the length direction of the information recording carrier. In the reproducing device, means for relatively moving the sensor and the information recording carrier in a direction corresponding to a direction substantially perpendicular to the length direction of the information track of the carrier, and means for outputting a read signal from the sensor at a timely manner; and means for counting the number of times the read signal is output.
This is achieved by an information reproducing device.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the apparatus of the present invention. In this figure, the same parts as in FIG. 9 are given the same reference numerals, and the explanation of these parts will be omitted here.

The sensor array output counting circuit 322 calculates the value of the R line once the pair of R lines (i.e., 202 and 202b in FIG. 8) associated with a certain information track is detected for the first time and the recorded information of the information track is reproduced. R on other information tracks again after the pair is no longer detected
The number of times the sensor array 10 outputs a read signal until the pair of lines is detected for the first time is determined. In this case, based on the R line detection number 319 and the drive clock 307 of the sensor array dryer 306, the sensor array 1/1
There is a read signal output of 0 and the R line detection signal 319
This is done by counting 1- drive clocks, using the time interval from a state where there is no output to a state where there is a read signal output from the sensor array 10 and the R line detection signal 319 is output for the first time. It will be done.

For example, depending on the relative movement speed between the sensor array 10 and the optical card and the time interval between the repeated read signal outputs of the sensor I/I, three readings can be made from the sensor array 10 per one information tray. If there is a signal, if the R line detection is accurate and there are no mistakes, i
! Since there are 3 outputs (3 readings between two consecutive time interval references), the output signal 323 from the output counting circuit 322 is 3'' for each count. If the R line of the track is not detected and therefore the information reproduction signal of the information track is not output (i.e.,
■If there is a reproduction error of information 1 rank), the output count circuit 322 will output 3 times the number of tears.
23 becomes "6". If there is a reproduction error of two consecutive 1-rank pieces of information, the output signal 323 from the output counting circuit 322 at that count becomes "9". Similarly to 1'-', the output liJ number circuit 322 outputs a number three times the number of information tracks in which the reproduction error occurred for each counted quantity.

The output signal 323 is sent to a divider 3244. The two of us are strong...
A two by three divider division is performed, thus the divider 32
Output from 4-; 325 indicates the number of 1 rank of information passed by the sensor array 10 every 8I times. The output signal 325 is input to a transocnance counting circuit 326. In the counting circuit, the handwritten number 4 325 is integrated, and when ≦iy, the 1 rack number 5 is output from the counting circuit 326.

As can be seen from the above explanation, the track number signal passes through the sensor array 10 starting from the time when the counting circuit 326 starts integration. It corresponds to 11-Ranori number.

On the other hand, the 5/4 conversion circuit 320 outputs the information reproduction signal only during reading when the R line detection signal 319 is output, and the information reproduction signal No. 14 is not output during reading when the R line is not detected. Therefore, the information reproduction signal output is not necessarily in the order in which the information tracks are arranged, but what is the to/tuk number signal that is output corresponding to the output of each information reproduction signal? It corresponds exactly to the information track on which information is recorded. In this way, it is possible to accurately determine which rank the reproduction information belongs to, and it becomes possible to specify the information rack in which the reproduction error occurred.

In the embodiment described above, the sensor array output counting circuit 322 includes a means for counting the number of sensor read signal outputs, a means for specifying an information track number based on the numerical value obtained from the means, etc. as separate hardware; Divider 324
Although the present invention is composed of a transducer counting circuit 326 and the like, it is also possible to obtain the same effect through software processing using a microprocessor or the like.

Furthermore, the present invention is also applicable to cases in which Q is difficult when using a record carrier such as a magneto-optical record carrier of a type in which the direction of magnetization force is reversed or a record carrier with concave and convex bits.

Furthermore, the present invention can be similarly applied to cases where a sensor other than an optical sensor is used as the sensor.

〔Effect of the invention〕

According to the present invention as described above, certain information +
Even if the 3rd track is not played back, you can know that the 1st track was not played, and what 1-rank information the information that was replayed after that is known. can be accurately determined. Therefore, even in cases where collective error correction is performed across multiple information tracks, or in cases such as image information or audio information where collective information is recorded across multiple information tracks, it is possible to It becomes possible to take effective measures such as synthesizing interpolated information of information that has not been reproduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the apparatus of the present invention. FIG. 2 is a schematic plan view showing the recording format of the optical card. FIG. 3 is a configuration diagram of the information reproducing device. FIG. 4 is a schematic diagram showing the recording format 1- of the information recording carrier. FIG. 5 is an explanatory diagram of the 415NRZI modulation method. FIG. 6 is an explanatory diagram showing the correspondence between the information l/rank and the sensor array. FIG. 7 is an explanatory diagram showing the correspondence between the sensor array and the information recording bits of the information recording carrier. FIG. 8 is an explanatory diagram showing a method for reproducing an information recording carrier. FIG. 9 is a block diagram of the information reproducing apparatus, and FIG. 10 is a block diagram of its reference line detection circuit. 1: Optical card, 2: Recording area, 3: Hand, 4: Information track, 5: R line, 7: Light source, 10: Sensor array, 11: Optical head, 201: Information track area, 202
: Separation area, 203: Hand, 204: Unit data area. Agent Patent Attorney Johei Yamashita --[- 〇Figure 5 Figure 8 E♂ Myo Figure 6 Figure 7 rl. Figure 10

Claims (4)

[Claims] (1) In an information reproducing apparatus that uses a sensor to reproduce an information recording carrier in which information tracks formed by one-dimensionally arranging information are arranged in a direction substantially perpendicular to the length direction of the information recording carrier,
means for relatively moving the sensor and the information recording carrier in a direction corresponding to a direction substantially orthogonal to the length direction of the information track of the carrier; means for outputting a read signal from the sensor at a timely manner; and means for outputting the read signal. An information reproducing device comprising means for counting the number of times. (2) The information reproducing apparatus according to claim 1, further comprising means for specifying a read information track based on the number of times the sensor outputs a read signal counted by the counting means. (3) The information reproducing apparatus according to claim 2, wherein the information track specifying means includes a dividing means and an integrating means. (4) The information reproducing device according to claim 1, wherein the sensor is an optical sensor.