CN1149743A - Adaption control method for optical data regenerator - Google Patents

Abstract

The present invention relates to a method for controlling the speed of gyro shaft motor in the optic disc data regeneration unit. The gyro shaft motor drives an optic disc to turn. Said unit consists of a control circuit possessing of a buffer memory. Said method consists of the following steps: (1) set the gyro shaft motor at a rated maximum speed to make the fetching rate of the data of the regenerating unit be a Vmax value, (2) fetch data for optic disc, (3) the fetched data are sent through buffer memory to the master computer, (4) calculate the fetching rate tap value of the present operated data, (5) check whether the Tap value is larger than or equal to the Vmax value, (6) if the result in step (5) is no, set the motor speed to make the fetching rate of the data of regenerating unit be about Tap value.

Description

The adaptation control method of optical data regenerator

The relevant optical data of the present invention (audio-video disc) regenerating unit (Player), the relevant adaptive type of You Zhiqi (adaptive) control method.

The reading device of CD as digital sound-Video Compact Disc (CD ROM disc) reader or optical data disk reader, is a basic equipment of advanced person's multimedia computer system.

The correlation technique of optical data disk reading device control system comprises U.S. Patent number 4,485,337,4,783,774,5,289,097,5,246,479 and 5,345,347.

Above-mentioned relevant technologies provides effective device or method to reach the purpose of creation respectively.But, the data read rate that the fit applications program is operated (data reading rate), seemingly having to provide the driving rotating shaft rotational speed of a method for control sound Video Compact Disc, so that can reduce the electric energy that is consumed.

In view of this adaptive type control method that the purpose of this invention is to provide a kind of optical data regenerator.

The control method of a data of optical disk regenerating unit shaft motor speed provided by the invention, this rotating shaft motor drives CD rotation, this regenerating unit comprises a control circuit, have the data that a memory buffer is read for temporary transient storage one host computer in this control circuit, the method comprises the following step:

(1) rotating shaft motor is set in rated maximum speed, makes that the data read rate of regenerating unit is a Vmax value;

(2) optical disk reading is fetched data;

(3), reading data are delivered to host computer via memory buffer;

(4) calculate the data read rate Tap value of running at present;

(5) whether detect the Tap value more than or equal to the Vmax value;

(6) if the result sets the speed of motor for not in step (5), make the data read rate of regenerating unit be about the Tap value.

The present invention will in conjunction with the embodiments and be described hereinbelow in detail with reference to the accompanying drawings, so that the present invention is obtained preferable understanding.

Brief Description Of Drawings:

Fig. 1 is machinery, the electronic component synoptic diagram of audio and video optical disk reproducing apparatus.

Fig. 2 is the process flow diagram of the inventive method.

As shown in Figure 1, the audio and video optical disk reproducing apparatus comprises one read head/CD assembly (pickup head/disc assembly), have one in it and activate device (actuator) 11, this activates, and device 11 comprises a radial coil winding (coil), focusing (focus) coil winding and activates motor (motor).This activates device 11 read head (pickup) 12 is positioned in the different radial positions on CD 13 surfaces.Read head/CD assembly also comprises and reads pre-amplification circuit (preamplifier) 18, for amplifying data and servo (servo) data that read by optical disc surface.Also comprise a read buffer memory (readbuffer) in the circuit 18, for the data of a certain track of read (track) are sent in regular turn.Digital signal processor (DSP) 19 receives the simulation reading of data of being sent here by circuit 18 in read head/CD assembly.As know technology, and digital signal processor 19 comprises a fetch channel analog filter (filter), and it provides simulating signal to a pulse detector (not shown).The output of pulse detector is original digital reading of data, is sent to a data extractor (not shown).Each element 15,19 in the disc drives circuit via a bus 102, is made interface with microprocessor 10 and is linked up, and as everyone knows, comprises address, control on the bus 102, reaches data-signal.The disc drives control circuit further comprises servocontrol part (servo controlsection) 15, and for the servo data that detects and handle by CD 13, servo data is about servo bursting (Burst), synchronizing pulse and orbital number etc.Servocontrol part 15 via bus 102, links with processor 10, and servocontrol part 15 operates and relevant servo the flowing of sequential and control data of reading of control.Servocontrol part 15 also comprises servo controller (controller), analog/digital converter and digital/analog converter.Simulation output 151 by 15 outputs of servocontrol part is sent to activated drive circuit 90.Activated drive circuit 90 comprises the power amplification control circuit, and it provides one to activate drive signal to a power amplifier (power amplifier), and power amplifier provides Control current to actuating device 11 more in regular turn.Shown system also comprises rotation motor control Driver Circuit 14, for the rotation drive motor 16 in control read head/CD assembly, so that drive audio and video CD 13.System also comprises a host computer interface 17, and by bus 171 and 102, its running is to provide the control between host computer (PC) and related elements and the passage of data.One memory buffer 93 is provided with coordinating the difference of data transmission rate between data transmission rate between host computer interface 17, host computer and host computer interface 17, audio and video CD.Easy speech, the memory buffer 93 temporary transient sound-image datas read by CD 13 that store.Digital signal processor 19 is also exported a feedback signal 191 to digital motor speed control circuit 91, this motor speed control circuit 91 with feedback signal 191 with make comparisons by processor 10 output signals 101.Result relatively is, with the data transmission rate viewpoint, whether the present rotating speed of motor is too soon or too slow.This result is used to control motor driver 14, and 14 of motor drivers provide electric energy to rotation drive motor 16.Element 92 is digital/analog converter (DAC), and element 94 is an amplifier.

Introduce two computing method of an application-specific desired data read rate below.The present data read rate of supposing the audio and video dish is Tcd, and the application's data read rate that must obtain be Tap.Method 1:

The known dimensions of supposing memory buffer 93 is a BS bit group.At first, measure memory buffer 93 and filled up the time spent Δ t of institute, then Tap=fcd-(BS/ Δ t) by data.Method 2:

Suppose memory buffer 93 inherent time point t ₁The time size of data be BS ₁The bit group, and at t ₂The time size of data be BS ₂The bit group, (1) is as BS ₂＞BS ₁, Tap=Tcd-[(BS then ₂-BS ₁)/(t ₂-t ₁] (2) as BS ₁＞BS ₂, Tap=Tcd+[(BS then ₁-BS ₂)/(t ₂-t ₁]

The flow process of Fig. 2 discloses step of the present invention.Step 20 is initial.In step 21, Tcd is set at Vmax, wherein Vmax audio and video CD pairing data read rate under the rotating speed of specified maximum for this reason.In the step 22, detect application program and whether require to fetch data by optical disk reading.If, carry out access action and in step 24 thereafter, data reached host computer via memory buffer 93 in step 23.In step 25, with above-mentioned two methods one of them, the present desired data read rate of computing application program.In step 26, whether detect Tap more than or equal to Vmax.As being non-in step 26, in step 27, Tcd is made as Tap, afterwards, whether correct to step 28 detection data read and transmission.In the step 29, Tcd is set at Vmax again.

It is noted that above-mentioned step is to carry out, and when step 27 was performed, processor 10 sent a signal to speed control circuit 91 by signal wire 101 in processor 10.Motor speed control circuit 91 indicates motor driver that the rotating speed of rotation drive motor 16 is slowed down then, to obtain the result of Tcd=Tap.

Claims (1)

1, the control method of a data of optical disk regenerating unit shaft motor speed, this rotating shaft motor drives CD rotation, this regenerating unit comprises a control circuit, has the data that a memory buffer is read for temporary transient storage one host computer in this control circuit, and the method comprises the following step:

(1) rotating shaft motor is set in rated maximum speed, makes that the data read rate of regenerating unit is a Vmax value;

(2) optical disk reading is fetched data;

(3), reading data are delivered to host computer via memory buffer;

(4) calculate the data read rate Tap value of running at present;

(5) whether detect the Tap value more than or equal to the Vmax value;

(6) if the result sets the speed of motor for not in step (5), make the data read rate of regenerating unit be about the Tap value.

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