JPS59107459A - Disk record reproducer - Google Patents

Abstract

PURPOSE:To always vary the address of a disk at a fixed rate in proportion to the high-speed feed period of a pickup and to improve operability of a disk reproducer by increasing or decreasing the number of reference addresses to be used for the high-speed feed of the pickup at a prescribed rate for each prescribed period in a high-speed feed period. CONSTITUTION:A control circuit 11 supplies the absolute time to be used as an address to an address comparator 28 and a reference address generator 29 out of the address signal supplied from an address detecting circuit 23. Then switches SF and SR corresponding to a rapid traverse and fast reset operating piece for high-speed feed of a pickup 19 are operated by a program stored in an ROM27. Then the reference addresses for high-speed feed of the pickup 19 are reduced at a prescribed rate, i.e., every second for each prescribed period. In such a way, the reduction rate of addresses is always constant. Thus a desired address can be easily retrieved even with a sensible operation of the operating piece.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention enables a high-speed and accurate address search for a disk on which both digital data and address data are recorded using the CLV (constant linear velocity) method. The present invention relates to a disc record playback device.

[Technical background of the invention]

Recently, for example, if an information signal such as an audio signal is digitized (in other words, converted to PCM) and recorded on a disc, if it is a notal disc record (hereinafter referred to as a disc), then the f-isuf record playback function will play back all the information recorded on the disc. A device is being developed.

The data is recorded as a bit string continuously formed in a spiral shape. In addition, a disc record playback device ftl''l: is a system in which an optical pickup follows the bit string recorded on the disk using a tracking control system to output the bit string one after another, and this readout signal is subjected to predetermined signal processing. These disk record playback devices can easily play back the desired recorded information because the amount of recorded information on the disk is enormous. In order to achieve this, a high-speed feed function is provided in which the pickup is moved at high speed in the forward and reverse directions in the radial direction of the disk, skipping the recorded information during that time and starting reproduction of the desired recorded information. The high-speed feed function of C is divided into the fast-forward (FF) function, which sends the big attenuate at high speed in the forward direction of the disk radial direction, and the fast-reverse (REIV) function, which sends the big atte at high speed in the reverse direction. It performs operations corresponding to fast forward and rewind operations.

In other words, this high-speed feed 9 function enables the disc record reproducing apparatus to perform so-called random access to search for a desired piece of divided digital data, thereby improving its operability.

For example, a well-known CD (Continued Disc) type disc, which is a well-known type of high-density recording disc, contains a subcode signal in digital data (that is, recorded information) along with a PCM signal that is a digitized audio signal. recorded.

Digital data consists of a predetermined number of frames that form one block. One block of default data is made to include one unit of subcode in addition to the PCM data. Among these subcodes, a predetermined subcode Q is a code in which address data on the disc of digital data to be recorded is recorded in a format as shown in FIG.

That is, one unit of the subcode Q is formed by data reproduced in the order shown in the following items.

1. Synchronization/mother turn OSl indicating the start of the subcode 2. Control unit (CTL) for pre-emphasis and distinguishing between 2nd channel and 4th channel 3. Mode unit (ADH) indicating the data mode of subcode Q 4. Digital data A track number section (MNR) for identifying the track (that is, a bit string) in which the track is recorded 5. An index section (X) that is the index information of the track number 6. Progress since the start of playback of digital data of a predetermined track number Part MIN 7 indicating the minute portion of time (hereinafter referred to as relative time) Part 5Ec8 indicating the second portion of relative time Part FRAME 9 indicating the attribute of data when one second of relative time is divided into a predetermined number of parts The part consisting of digital zero data ZERO10, the part that becomes the address and indicates the minute part of the elapsed time (hereinafter referred to as absolute time or address) since the disc started playing.MIN11, the second part of the absolute time. The part ASEC12 indicates the data attribute when one second of absolute time is divided into a predetermined number of parts, the part AFRAME13 indicates the attribute of the data, the part RC indicates the error calibration code of the subcode Q, and the subcode Q has the above format.
is extracted by the disc record playback device, and the data of MNR, ing.

[Problems with background technology]

By the way, as is well known, digital data is recorded on CD-type discs using the CLV (linear velocity-foot) method.

As a result, when the pickup is located on the predetermined radius r of the disk, the relationship between the radius r and the absolute time (ta) does not become a relationship shown by a constant slope as shown in FIG. 2.

Therefore, the moving distance of the pickup for a predetermined reproduction time is different between the inner circumference side and the outer circumference side of the disk. That is, in a disc record playback device,
Since the high-speed feed rate of the pickup is conventionally assumed to be constant,
Even if the backup is sent at high speed for the same period, the absolute time of change will not be constant. Therefore, when searching for an address using the Bic Amplifier's high-speed feed 9 function, it is not easy to search for the desired address if you operate the high-speed feed control on the disc record playback device by feeling. There were some difficult problems. Furthermore, when a disc record playback device performs a high-speed movement of the pickup, the relative time displayed on the display changes to become faster or slower, making it difficult to read. be.

B [Object of the Invention] This invention was developed in view of the above points, and it is possible to achieve high-speed transport υ by keeping the address change of the disk constant within a predetermined period during the nine high-speed transport periods of the big amplifier. It is an object of the present invention to provide a disc record reproducing device having extremely good operability in which an address always changes at a constant rate in proportion to a period.

[Summary of the invention]

The present invention provides a disc record playback device that performs a playback operation by moving a big amplifier along the radial direction of a disc on which digital data is recorded with an address assigned to each predetermined unit of the digital data. .

a first means for forcibly feeding the pickup in the forward or reverse radial direction of the disk at high speed; and a standard for cylinder rapid feeding of the pickup at predetermined intervals when a high-speed feeding operator is operated. A second means for increasing or decreasing the reference address to be used at a predetermined rate, and comparing the reference address obtained by this second means and the address reproduced from the corresponding -Kukuazo by the pickup, and determining whether both are the same. Pick up f′! until each matches. ! - a third means for moving the disk at high speed in the forward or reverse radial direction.

[Embodiments of the invention]

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 shows the configuration of a disc record playback device according to the present invention, in which a control circuit 11 comprising a microcomputer and various interface circuits includes a playback operator, a stop operator, and a fast forward (FF) operator. , fast rewind REV) Switches (Sp), (Ss) that act as operators
-(SF)-(SR) are connected.

The control circuit 1 controls the disc playback system with each switch (S
p), (Ss), (SF).

The disc reproduction system 12 is controlled to a predetermined state according to the operation state of (SR), and the track number and index obtained from the subcode Q.

Output control circuit 13 that displays address data such as relative time
The information is displayed on the display 14 via the .

That is, when the disc motor 16 and the pickup feed 9 motor 17 are driven from the control circuit 11 via the external control circuit 15, the disc reproducing system 12 operates as shown in FIG.
The data recorded in is reproduced by the big amplifier 19, and the reproduced signal is sent to the RF signal detection circuit 20.

This RF signal detection circuit 20 transfers the reproduced signal to a servo circuit 21.
and a signal supplied to the demodulation circuit 22.

Here, the servo circuit 21 causes the big amplifier 19 to perform focus servo and tracking servo, and also sends various signals to the pickup feed motor 17 to perform linear tracking servo.

Further, the demodulation circuit 22 separates a subcode Q for address data detection from the reproduced signal, supplies the subcode Q signal to the address detector 23VC, and demodulates (EFM) the reproduced signal from which the subcode has been separated. The signal is then supplied to the D/A converter 24.

The address signal detected by the address detector 23 is taken into the RAM 25 via the control circuit 11 and is used to perform necessary control functions.

The reproduced data returned to an analog signal by the D/A converter 24 is subjected to necessary error correction, dinterleaving, error correction life, etc., and is then used to drive the speaker 26 to produce sound. You will be forced to do so.

In FIG. 3, reference numeral 27 denotes a ROM for driving the control circuit 11 with a predetermined program.

By the way, the control r111 circuit 11 converts the absolute time (data) serving as an address from the address signal supplied from the address detection circuit 23 from the output section (ORA) to the 10,000-power section of the address comparator 28 and the reference address generator. It is designed to supply the human power section of the container 29.

The reference address generator 29 is constituted by, for example, a presettable Azo/Dawan counter, and supplies counted value data to the other input section of the address comparator 28, and also receives data from the control circuit 11. It is controlled as shown in the following items by various conventional control signals provided.

At the rising edge of the signal supplied from the blade terminal (Old) of the control circuit 1 to the control input terminal (LD), the address data supplied to the input section is held in the internal register. However, when the control human input terminal (ld) is set to low level, the data provided to the input section is output as is.

(2) A clock signal of a predetermined period is supplied from the output terminal (Oak) of the control circuit 11 to the input terminal (ck) from the output terminal (Oud) of the control circuit 11 to the control input terminal (u/d).
) counts up and counts down in response to the low level and low level supplied to the circuit.

The address comparator 28 is constituted by, for example, a digital connogrator, and is an output part of the control circuit 11 (
ORA) is smaller than the output data value of the reference address generator 29 by υ, the output terminal (FD) is set to high level, the external control circuit 15 is forcibly driven, and the pickup 19 is moved in the radial direction of the disk 18. It is designed to move at high speed in the positive direction of . In addition, the control circuit 1
When the data value of the output terminal (ORA) of the reference address generator 29 is larger than the output data value of the reference address generator 29, the output terminal (RD
) is set to a high level, the external control circuit 15 is forcibly driven, and the pickup 19 is moved at high speed in the opposite radial direction of the disk 18. Then, when the data values supplied to the pair of input sections are equal, the address comparator 28 sets both output terminals (FD) and (RD) to a low level, and the external control circuit 1
5 is forcibly controlled to bring the pickup 19 into a pause state where the feeding of the pickup 19 is stopped.

On the other hand, the control circuit 11 controls the ROM 27
The program stored in the switch (SF) and (
When SR) is operated, the operations shown in the following items start almost simultaneously.

(1) Connect the output terminal (Old) from low level to
Ireperu.

(2) The operated switch is (SF) 6 or (
The output terminal (Oud) is set to a low level or a low level depending on the level of the output (Sn).

(3) Output a clock signal with a predetermined period to the output terminal (Ock).

Furthermore, in the reproduction state, the external control circuit 15 is configured to feed the pickup 19 at a normal low speed, regardless of the output signal of the address comparator 28.

Next, the main operations of the disc record reproducing apparatus having the above configuration will be explained.

For example, when the switch (SF) corresponding to the fast-forward operator is operated, the control circuit 11 raises the output terminal (Ola) to an output terminal as shown in FIG. As shown in (b), the output terminal (Old) is set to high level. Furthermore, the control circuit 11 has an output terminal (
Oak) outputs a pulse-like clock signal having a predetermined period as shown in FIG. 4(c). As a result, the reference address generator 29 outputs the current address on the disk 1.
If the reproduction address of 8 is A as shown in Fig. 4(f), A is loaded into the register as the reference address while the switch (SF) is operated, and the clock shown in Fig. 4(c) is The signal is counted and the value in the register is counted up to increase the reference address by one second.

Here, the reference address of the reference address generator 29 is A+
1, the output section (ORA) of the control circuit 11 is
The data in A is the data of A, and the address comparator 28 is the fourth
As shown in Figure (d), output terminal (FD) 'e is raised to high level. Therefore, the external control circuit 15 controls the pickup 1 via the pickup feed motor 17.
9 in the positive radial direction of the disk 18 at high speed. Then, when the output section (ORA) data (reproduction address) of the control circuit 11 becomes A+1, the address comparator 2
The output terminal (FD) of No. 8 falls to low level (Fig. 4 (
(see d)), the external control circuit 15 stops the high-speed feeding of the pickup 19 by the Villafauge feed motor and puts the disc record reproducing apparatus into the pause state again. Similarly, every time the reference address of the reference address generator 290 is counted up by the clock signal, the pink-up I
9 is intermittently high-speed forward, and the playback address (that is, absolute time) of the disk 18 is A+llA+2, A+
3 +..., the output terminal of open/open circuit II (0,
ck) increases by 1 second for each period of the clock signal output from ck). Tsu-! , 9. The slope of the address (absolute time) with respect to the operation period of the switch (SF) is
'19 is always constant no matter what position it is with respect to the disk 18.

If the operation of the switch (SF) is canceled when the playback address of the disk 18 is, for example, A+3, the control circuit 11 outputs the output terminals (Old) and (O
ud) are toss to low level, respectively, and the output of the clock signal from the blade terminal (OCk) is stopped. As a result, each output terminal (FD) of the address comparator 29 and (
RD) both become low level, and the disc record playback device enters a pause state.

Next, in this state, switch (S) corresponding to the fast reversal operator.
When R) is operated, the control circuit 1 outputs the output terminal (Ou
d) does not rise to a high level, only the output terminal (Old) rises to a high level, and a clock signal is output from the blade terminal (Ock). As a result, the reference address generator 29 loads the register with the playback address A+3 at the rising edge of the output terminal (Old) of the control circuit 11.
Hereinafter, the clock signal shown in FIG. 4(c) is counted (counted down) to decrease the reference address by one second.

Here, the reference address generator 290 reference address is A+
2, the address comparator 28 lowers the output terminal (RD) to the NO level as shown in FIG. 4(e). Therefore, the external control circuit 15 causes the pickup 19 to move at high speed in the opposite radial direction of the disk 18 via the pickup feed motor 17. Then, when the blade data (reproduction address) of the blade part (ORA) of the control circuit 11 becomes A+2, the output terminal (RD) of the address comparator 28 falls to a low level (see FIG. 4(, )).
The external control circuit 15 stops the high-speed feeding of the pickup 19 by the big and small feed 9 motors, and brings the disk record reproducing apparatus into the all-pause state again. In the same manner, every time the reference address of the reference address generator 29 is counted down by the clock <g, the big ara f19 moves at high speed as in the case of fast forwarding, and the playback address of the disk 18 becomes A+21A+1lAIA-11... decreases by 1 second for each period of the clock signal. As a result, the slope of the address (absolute time) with respect to the operation period of the switch (SR) is always one foot sharp no matter what position β the pickup 19 is with respect to the disk 18.

In this way, by keeping the rate of increase and decrease of addresses constant during the fast-forward and fast-reverse operation periods, it is possible to easily search for a desired address even when operating the controls intuitively. and the display 14
Since the address change is just one step, the display becomes easy to read and looks very good.

It goes without saying that the present invention is not limited to the above embodiments, and that various modifications and applications are possible without departing from the gist of the present invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, by keeping the change in the address of the disk constant within a predetermined period during the high-speed transport period of the pickup, the address always remains at a constant rate in proportion to the high-speed transport period. The object of the present invention is to provide a disc record playback device that has extremely good operability and that allows for variable playback.

[Brief explanation of drawings]

Figure 1 is a diagram showing the format of the subcode Q that is address data recorded on the disc. Figure 2 is the radius of the r4 disc and the absolute time recorded. Figure 4 (,) to (f) are the FIG. 4 is a timing diagram used to explain the characteristic operation of the device shown in FIG. 3; 11... Control circuit, 12... Disc playback system, 13
...Display output control circuit, 14...Display device, 15...
・External control circuit, 16... Disc motor, 17...
・Pickup feed motor, 1B...disc, 19
...Pickup, 20...RF detection circuit, 21.
... Boo2 circuit, 22... Demodulation circuit, 23... Address detection circuit, 24... A/Df conversion circuit, 25...
RAM...? 6...Speaker, 2? ...ROM. 28... Address comparator, 29... Reference address generator, Ss + Spe Sr +, Sur... switch.

Claims (1)

[Claims] In a disc record reproducing apparatus that performs a reproducing operation by moving a pickup along the radial direction of a disc on which digital data is recorded with an address assigned to each unit of digital data, the pickup is a first means for forcibly feeding the disk in the forward or reverse direction of the radius at high speed; and a predetermined reference address that is a reference for high-speed feeding of the pickup at predetermined intervals when a high-speed feeding operator is operated. A second means increases or decreases at a rate of A disc record reproducing apparatus comprising: third means for moving a pickup at high speed in the forward or reverse radial direction of the disc.