JP3505244B2 - Information recording / reproducing apparatus time calculation method and mini-disc recorder / player - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus, and more particularly to a time calculating method for a mini disk (hereinafter referred to as MD) recorder / player and an MD recorder / player.

[0002]

2. Description of the Related Art According to the MD standard, the sampling frequency is 44.1 KHz, the number of sound groups per sector is 5.5, and the number of sampling data per sound group is 512. The reproduction time is represented by the following formula. 1 / 44.1 (KHz) x 512 x 5.5 = 704/110
25 (seconds / sector) That is, the recording / reproducing time of 11025 sectors is 704 seconds, and the recording / reproducing time per sector is about 63.
8549 × 10 ⁻³ seconds, conversely, the number of sectors recorded / reproduced per second is about 15.661 sectors. Therefore, conversion processing is necessary to obtain the recording / reproducing time from the position information of the disc which is the information recording medium.

FIG. 8 shows a relationship diagram between the number of sectors and the conversion time of a conventional MD recorder / player. In the conventional MD recorder / player, the position information is converted into the recording / reproducing time by first counting 16 sectors and counting for 1 second, then counting 16 sectors again for 1 second, and then counting 15 sectors for 1 second. Then, the position information is converted into the recording / reproducing time by repeating the above.

[0004]

DISCLOSURE OF THE INVENTION Conventional MD recorder /
The player time calculation method is 16 sectors, 16 sectors,
By converting a total of 47 sectors of 15 sectors to 3 seconds, the number of sectors per second becomes about 15.667 sectors, so that the conversion time is 704 seconds for 11030 sectors as shown in FIG. There is a problem in that an error of 5 sectors occurs with respect to time. Further, since this error is integrated, the larger the number of sectors, the larger the error between the conversion time and the recording / reproducing time. Actually, in the case of a disc capable of recording 74 minutes, the conversion time is delayed by about 1.7 seconds in the length from the beginning to the end of the disc.

The present invention has been made in view of such circumstances, and is information for calculating a more accurate conversion time from position information of an information recording medium without adding up an error between the conversion time and the recording / reproducing time. It is an object to provide a time calculating method for a recording / reproducing apparatus and a mini disk recorder / player.

[0006]

A method for calculating time of an information recording / reproducing apparatus according to a first aspect of the present invention has a predetermined sampling frequency.
A predetermined number of data sampled in 1
Information recorded in the sector and information read from the information recording medium
Information is obtained by obtaining position information from the information recording medium of the recording / reproducing apparatus.
In the time calculation method for calculating the recording / playback time of
Set a constant sector as the reference unit for time calculation, and set the reference unit
Recording / playback time of the specified number of sectors of
Each is composed of an integer number of sectors so that
It is characterized in that the recording / reproducing time of information is calculated based on the above-mentioned reference unit in which information is recorded / reproduced and the number of the partial units.

In the mini disk recorder / player time calculating method according to the second aspect of the present invention, the sampling frequency is 44.
1KHz, the number of sampling data per sector is 28
In the time calculating method for calculating the recording / reproducing time of information by obtaining the position information from the disc of the mini disc recorder / player which is 16, 11025 sectors are defined as the reference unit of the time calculation , and the reference unit of the reference unit is set. Record 11025 sectors /
Each time the playback time is roughly equivalent to an integer value in seconds
Is divided into multiple sub-units with an integer number of sectors
The information recording / reproducing time is calculated based on the number of the reference unit and the partial unit in which the information is recorded / reproduced.

A method for calculating time of a mini disc recorder / player according to a third aspect of the invention comprises the reference unit 11
025 sectors in order of 877 sectors, 830 sectors,
877 sector, 830 sector, 830 sector, 877 sector, 830 sector, 877 sector, 830 sector, 8
It is characterized in that it is divided into 13 sub-units each consisting of 30 sectors, 877 sectors, 830 sectors and 830 sectors.

A mini disk recorder / player according to a fourth aspect of the present invention has a sampling frequency of 44.1 KHz and 1 sector.
Mini that has 2816 sampling data per data
11025 sec for disc recorder / player
Standard unit calculating means for calculating the recording / reproducing time of information using the data as a reference unit, and 11025 sectors of the reference unit.
So that the recording / playback time approximately corresponds to an integer value in seconds.
Each so that the number of sectors consists of an integer
A partial unit calculating means for calculating the recording / reproducing time of the information of each of the plurality of partial units; and a means for calculating the recording / reproducing time of the information based on the calculation time by the reference unit calculating means and the partial unit calculating means. It is characterized by being provided. Mini-disc recorder / player according to the fifth invention, the partial unit calculation means, the 11025 sectors constituting the reference unit, 877 sectors sequentially, 830 sectors, 877 sectors, 830 sectors, 830 sectors, 87
7 sectors, 830 sectors, 877 sectors, 830 sectors, 830 sectors, 877 sectors, 830 sectors, 83
It is characterized in that it is divided into 13 sub-units each constituted by 0 sectors.

[0010]

In the time calculating method for the information recording / reproducing apparatus of the first invention, a predetermined number of sectors are set as the reference unit for time calculation , and
Recording a predetermined number of sectors of the reference units / playback time in seconds
The number of sectors is an integer so that
Information is recorded / played back by dividing it into multiple parts.
The information recording / reproducing time is calculated based on the number of the reference units and the partial units that are generated.

In the time calculating method for the mini disc recorder / player of the second aspect of the invention, 11025 sectors are defined as the reference unit for time calculation , and 11025 sectors of the reference unit are recorded / playback time is an integer value in seconds. It is almost equivalent to
This is divided into multiple sub-units, where the number of sectors is an integer
And, information to calculate the recording / reproducing time information based on the number of recording / reproduced the reference units and the partial unit.

[0012] In the time calculating method for a mini disc recorder / player of the third invention, the reference unit 110 is constituted.
25 sectors in order, 877 sectors, 830 sectors, 8
77 sectors, 830 sectors, 830 sectors, 877 sectors, 830 sectors, 877 sectors, 830 sectors, 83
0 sector, 877 sector, 830 sector, 830 sector
The information is recorded based on the fact that the reference unit corresponds to 704 seconds, the 877 sector corresponds to 56 seconds, and the 830 sector corresponds to 53 seconds. Calculate the playback time.

In the mini disk recorder / player of the fourth aspect of the present invention, information is recorded with 11025 sectors as a reference unit.
/ Reference unit calculation means for calculating the reproduction time, and the reference unit
11025 sectors, the recording / playback time is adjusted in seconds.
The number of sectors is an integer so that
Information for each of multiple sub-units
A partial unit calculating means for calculating the recording / reproducing time of
Calculation by the reference unit calculation means and the partial unit calculation means
The recording / reproducing time of information is calculated based on the time . The mini-disc recorder / player of the fifth aspect of the present invention, 11025 sectors the partial unit calculating means constituting said reference unit
In order of 877 sector, 830 sector, 877 sector, 830 sector, 830 sector, 877 sector, 83
0 sector, 877 sectors, 830 sectors, 830 sectors, 877 sectors, 830 sectors, it at 830 sector
The reference unit is a unit for calculating the recording / reproducing time by dividing it into 13 sub-units, each of which is divided into 13 units , the sub-units of which are approximately 877 sectors and 56 seconds, and 830 sectors and 53 seconds. The information recording / reproducing time is calculated based on the above.

[0014]

The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a block diagram of the essential parts of the MD recorder / player of the present invention. The input signal input from the input terminal 1 is converted into a digital signal by the A / D conversion circuit 2, and this digital signal is compressed by the ATRAC encoding circuit 3 and is subjected to high efficiency encoding to be given to the format circuit 4. . The format circuit 4 adds a subcode signal to the digital signal, rearranges the subcode signal based on an error correction method, and supplies it to the magnetic head drive circuit 5 and the shock proof memory 6. The magnetic head drive circuit 5 converts the input signal into the signal for writing to the disk 9 and supplies the signal to the magnetic head 7. The shock proof memory 6 is connected to the format circuit 4 and the deformat circuit 11 so that the shock proof memory 6 outputs data from the format circuit 4 while writing is interrupted when a shock is applied from outside the MD recorder / player during a recording operation. The digital signal of is stored, and when the writing is restarted, the stored signals are collectively recorded to prevent the recorded information from being interrupted.

On the other hand, the laser pickup 8 heats the surface of the disk 9 to a Curie temperature at which the coercive force of the magneto-optical film of the disk becomes zero at the time of recording, and at the time of reproduction, reads a pit signal to reproduce HF (High Frequency).
ncy) amplifier and ADIP (ADress In P)
supply to the demodulation circuit 10. Reproduction HF
The input signal is amplified in the amplifier and ADIP demodulation circuit 10 and given to the reformatting circuit 11, where it undergoes processing such as error correction and the like, and the ATRAC decoding circuit 12
Given to.

The reformatting circuit 11 restores the order of the digital signals based on the error correction method, and outputs them to the shock proof memory 6 and the ATRAC decoding circuit 12. The shock proof memory 6 always stores a large amount of digital signals from the deformat circuit 11 during the reproducing operation, and reproduces the accumulated signals while the reading is interrupted by an external shock. Prevents the reproduced information from being interrupted. ATR
The AC decoding circuit 12 expands and decodes the compressed and encoded input signal to restore the original digital signal, converts it into an analog signal in the D / A conversion circuit 13, and then outputs it through the output terminal 14. Supply to an external device (not shown) connected thereto.

On the other hand, 18 is a control circuit using a microcomputer, which is a motor control circuit 17
To the spindle motor 15 for rotating the disk 9 and the sled motor 16 for moving the pedestal to which the magnetic head 7 and the laser pickup 8 are fixed in the radial direction of the disk 9. A key switch and a mechanical switch are connected to the input terminals 19 and 20 connected to the control circuit 18, respectively, and the user gives an instruction to the control circuit 18 by using these switches.

A sectional view of the disk 9 is shown in FIG. Reference numeral 31 is a lead-in area, in which pits are formed similarly to a compact disc, and a TOC such as a recordable area.
(Table of Contents) information is recorded. Reference numeral 32 denotes a UTOC (User TOC) area in which information such as disk and track names, start and end addresses of each track, date and time when the track is recorded, and the like are recorded. 33 is a program area,
This is an area for recording music data.

Reference numeral 34 is a lead-out area, which is a margin area when the laser pickup jumps out due to an external impact or the like. Grooves called “grooves” for recording information are formed in the UTOC area 32, the program area 33 and the lead-out area 34, but the actual recordable areas are the UTOC area 32 and the program area 33. is there. This groove is slightly wobbled from the circumference to form an address which is position information.

The address is managed by a cluster in which sectors and additional information are collected. FIG. 3 shows a block diagram of the address. As shown in the figure, one cluster consists of 36 sectors,
Sectors 00H to 1FH are used as main data areas, sectors FCH to FFH are all treated as sub data areas in the lead-in area where pits are formed, and only FFH is used as a sub data area in areas where grooves are formed. , The remaining area is a linking area which is a margin between clusters. The UTOC area is defined to start from the end of the bit area (the innermost circumference of the group area).

FIG. 4 shows the correspondence between blocks and sectors for explaining the MD recorder / player time calculation method according to the present invention. As described above, the number of sectors read per second based on the MD standard is about 15.661 sectors. Therefore, in the present embodiment, one block is set as {(16 + 16 + 15) × N + (16 + 15)} (sector), where N / 17 or 18 is set, with a partial unit corresponding to an integral multiple of the recording / playback time being a block. . When N = 17, one block has 830 sectors, and the reproduction time is about 53 seconds. If N = 18,
One block has 877 sectors, and the reproduction time is about 56 seconds. Since the relationship between the data length and the reproduction time is 704 seconds for 11025 sectors, the length of 11025 sectors is divided into 13 blocks as shown in FIG.

The control circuit 18 calculates the time. 5, 6 and 7 are flowcharts showing an algorithm for calculating time according to the present invention. In the figure, this processing procedure is processing for discriminating reference units (S2, S3) and processing for discriminating blocks (S4, S5, S7, S9 to S1).
7), processing for converting blocks into time (S6, S8, S
18-S27) and processing for converting the position within the block into time (S28-S32).

Reproduction from a signal read from the disk 9 by the laser pickup 8 HF amplifier and ADI
The address value taken out by the P demodulation circuit 10 is given to the control circuit 18. In the control circuit 18, first, the conversion time is set to zero (S1), and it is determined whether or not the address value is within 11025 sectors which is a reference unit (S).
2). If it exceeds 11025 sectors, 11025 is subtracted from the address value to make a new address value, and 704 is added to the conversion time to make this a new conversion time (S3), and then the process of S2 is performed again. Is repeated until the address value becomes 11025 sectors or less. 110
If it is 25 sectors or less, it is determined whether or not it exceeds the 877 sector, which is the length of the first block (S
4).

When the number of sectors is 877 or less, the address value is divided by a total of 47 of 16 + 16 + 15, and the remainder is newly set as an address value. (S28). Next, it is determined whether the address value is 15 sectors or more (S2
9) If the number of sectors is less than 15, the conversion time at the present time is used as the conversion result. If it is 15 sectors or more, it is determined whether it is 31 sectors or more (S30), and if it is less than 31 sectors, 1 is added to the conversion time to obtain the conversion result (S31). If there are 31 sectors or more, 2 is added to the conversion time and this is used as the conversion result (S32).

On the other hand, if the address value exceeds 877 sectors in S4, it is determined whether or not it exceeds 1707 sectors, which is the total length of the first and second blocks (S5). Subtracts 877 from the address value and makes this a new address value, and further adds 56, which is the conversion time of the first block, to the conversion time to make this a new conversion time (S6), and the process proceeds to S28. Transfer. 1st and 2 when exceeding 1707 sectors
258, which is the total length of the third and third blocks
It is determined whether or not it exceeds 4 sectors (S7), and if it is 2584 sectors or less, 1707 is subtracted from the address value to make this a new address value, and the 1st and 2nd blocks are added up in the conversion time. The converted time is 109
Is added to obtain a new converted time (S8), S28
Move the processing to. Thereafter, similarly, it is determined which block is located (S9 to S17), the address is converted into time (S18 to S27), and the position within the block is converted into time (S28 to S31). Get the conversion result by.

[0026]

As described above, according to the present invention, a predetermined number of
The sector is defined as the reference unit for time calculation , and the reference unit
Recording / playback time of several sectors is roughly equivalent to an integer value in seconds
As for each, the number of sectors is an integer
The recording / reproducing time of the information is calculated based on the number of the reference unit and the partial unit in which the information is recorded / reproduced, and the error between the calculated time and the recording / reproducing time is integrated. Without doing so, a more accurate conversion time can be calculated from the position information of the information recording medium.

The present invention can also be used in an information recording device and an information reproducing device, and there is a mismatch between the conversion time calculated from position information and the information recording / reproducing time. Similar effects can be obtained by using the present invention in a device.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part of an MD recorder / player used for implementing the present invention.

FIG. 2 is a cross-sectional view of a disc.

FIG. 3 is a configuration diagram of an address.

FIG. 4 is a correspondence diagram between blocks and sectors.

FIG. 5 is a flowchart showing a time calculation algorithm according to the present invention.

FIG. 6 is a flowchart showing a time calculation algorithm according to the present invention.

FIG. 7 is a flowchart showing a time calculation algorithm according to the present invention.

FIG. 8 is a relationship diagram between the number of sectors and the conversion time of a conventional MD recorder / player.

[Explanation of symbols]

3 ATRAC encoding circuit 4 format circuit 9 discs 11 Deformat circuit 12 ATRAC decoding circuit 31 Lead-in area 32 UTOC area 33 program area 34 Lead-out area

Claims (5)

(57) [Claims] 1. Sampling at a predetermined sampling frequency
Record a predetermined number of recorded data in one sector of the information recording medium
Then, in the time calculating method for calculating the information recording / reproducing time by obtaining the position information from the information recording medium of the information recording / reproducing apparatus for reading the information from the information recording medium, the predetermined number of sectors is set as the reference unit for the time calculation. , The standard
Integer a position of a predetermined number of sectors recording / playback time seconds
The number of sectors is an integer
Into a plurality of sub units, information information and calculates the recording / reproducing time information based on the number of recording / reproduced <br/> the reference units and the partial unit recording / reproducing Method of calculating time of device. 2. A sampling frequency of 44.1 KHz, 1
At time calculation method sampling number of data per sector is calculated recording / reproducing time information to obtain location information from the disk of the mini disc recorder / player is 2816, set a reference unit time of calculating the 11025 sectors, the reference
Recording / playback time of 11025 sectors is adjusted in seconds.
The number of sectors is an integer so that
Information is recorded / reproduced by dividing it into multiple parts.
A method for calculating time of a mini disk recorder / player, characterized in that the recording / reproducing time of information is calculated based on the number of the standard units and the number of partial units. The 3. A 11025 sectors constituting the reference unit, 877 sectors sequentially, 830 sectors, 877 sectors, 830 sectors, 830 sectors, 877 sectors, 83
0 sector, 877 sectors, 830 sectors, 830 sectors, 877 sectors, 830 sectors, it at 830 sector
3. The method for calculating time of a mini disk recorder / player according to claim 2, wherein each of the divided parts is divided into 13 parts . 4. A sampling frequency of 44.1 KHz, 1
In a mini disk recorder / player in which the sampling data number per sector is 2816, 11025
Calculate recording / reproducing time of information using sector as reference unit
The reference unit calculation means and 11025 sectors of the reference unit,
Number of sectors for each , roughly equivalent to an integer value in seconds
A sub-unit that is divided so that is composed of integers
A partial unit calculation means for calculating a recording / reproducing time of the respective information, according to the reference unit calculation unit and the partial unit calculating means
A mini disk recorder / player, comprising means for calculating a recording / reproducing time of information based on the calculated time . 5. The reference unit
11025 sectors that make up the, 877 sector in order,
830 sector, 877 sector, 830 sector, 830 sector, 877 sector, 830 sector, 877 sector, 8
13 sectors for each of the 30 sectors, 830 sectors, 877 sectors, 830 sectors, and 830 sectors.
5. The mini disc recorder / player according to claim 4, wherein the mini disc recorder / player is divided .