KR920006925A - Optical high speed search method and apparatus for laser disk - Google Patents

Abstract

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Description

Optical high speed search method and apparatus for laser disk

As this is a public information case, the full text was not included.

1 is a block diagram according to the present invention.

2 is a flow chart in accordance with the present invention.

3 is an operation timing diagram of FIG.

* Explanation of symbols for main parts of the drawings

101: keyboard 102: main controller

103: servo motor control unit 104: servo motor driver

105: servo motor 106: encoder

107: Opic 108: Pickup

109: sled error signal generator 110: preamplifier

111: DSP 201: monostable MV (Multy Vibrator)

202 and 211: falling edge detecting means 203: latching means

204: acceleration signal generating means 205: third mux

206: the first mux 207: the second mux

208: signal shaping means 209: inverter means

210: counter 212: brake signal generating means

213: fourth mux 214: comparison means

215: rising edge detecting means 301: first signal generating means

302: second signal generating means 303: amplifying means

Claims (8)

The pickup 108 reads out the signal recorded on the disk by emitting a laser beam onto the surface of the disk and then detects the state of light reflected from the disk's fit, and the signal detected by the pickup 108 is in error. The tracking error signal is detected from the preamplifier 110 and the DSP 111 and the signal read out from the pickup 108 and then used to output the tracking position signal TR, which is data on the tracking position at that time. A laser including a sled error signal generator 109 for generating and outputting a sled error signal SE, and a servo motor 105 for receiving the predetermined motor driving signals MM1 and MM2 to move the pickup 108. In the high-speed search apparatus of a disc, an encoder 106 attached to the pickup 108 and having a straight slit, and fixed to a driving periphery of the encoder 106, transmits light to the encoder 106, and then reflects reflected light. The encoder 106 receives the light. The pick-up 107 which generates and outputs the first and second ohmic signals Q1 and Q2 which are proportional to the number of slits of the encoder 106 detected when driving and have a predetermined phase difference (90 °) from each other, and the pickup A keyboard 101 having various function keys for driving 108 and a search key for realizing a function of searching for a predetermined position on a CD, and outputting corresponding machine language data when the keys are selected; Receives a tracking position signal TR from 111 and detects the position of the pickup 108 and the position of the fit row tracked by the pickup 108 to search for the search key data from the keyboard 101. Outputs a search signal (SH) for starting and calculates the position of the fit column at that time and calculates the position of the destination to be searched from there to determine the search direction and then controls the pickup 108 in that direction. Output reverse signal (REV) At the same time, after outputting a search ON signal SHIN indicating a search start, the breakpoint data RFDT for controlling the speed of the servomotor 105 is calculated and output from the searched destination data. When the SHOF is input, the main controller 102 resets each control for performing the search to an initial value, and amplifies the sled error signal SE from the sled error signal generator 109 to drive the motor. The signal is supplied to the servo motor 105 as the signals MM1 and MM2. When the search signal SH is input from the main controller 102, the sled error signal SE is grounded and bypassed. The servo motor is supplied by selecting the current source IS1 and the second current source IS2 according to the predetermined current source control signals TC1 and TC2 and inverting and amplifying them to supply the motor driving signals MM1 and MM2 to the servo motor 105. When rotating in reverse or forward direction at high speed Receives first and second error signals Q1 and Q2 from the servo motor driver 104 and the ohmic 107, detects the movement state of the pickup 108, and searches for the search from the main controller 102. The servo motor 105 is driven to generate the current source control signals TC1 and TC2 to the servo motor driver 104 by receiving the signal SHON and the break point data RFDT. A servo motor control unit for controlling the rotation direction of the servo motor 105 by controlling and changing a state of the first and second current source control signals TC1 and TC2 by receiving a reverse signal REV from the main controller 102. An optical high-speed search device for a laser disk, characterized by comprising (103). The monostable MV 201 according to claim 1, wherein the servo motor control unit 103 receives the search-on signal SHON and outputs a pulse W1 in which the active state width of the pulse is widened. Polling edge detection means 202 for detecting the falling edge of the pulse (W1) widened in 201 and outputs a predetermined pulse (W2) and receiving the break point data (REDF) of the falling edge detection means (202) A latch 203 which latches and outputs a latch in response to a pulse and a reverse signal REV, a first ohmic signal Q1, and a second ohmic signal Q2 when the reverse signal REV is in a passive state. First signal generating means 301 for outputting an enable signal in an active state and generating and outputting the same count clock as that of the first ohmic signal Q1 in a period where the signal Q1 is earlier than the second ohmic signal Q2. And receiving the enable signal of the first signal generating means 301 and generating a predetermined pulse in the falling edge portion thereof. Polling edge detection means 211 for outputting a search off signal (SHOF), the enable signal receiving and enabling the count up according to the count clock and outputs a counter that is cleared by receiving the search off signal (SHOF) A comparison means 214 for outputting a predetermined pulse W3 when the output value of the counter 210 is compared with the output value of the latch means 203, and an output pulse of the comparison means 214; A rising edge detection means 215 for detecting a rising edge and outputting a detection pulse W4 at that time, and an output detection pulse W4 and the falling edge detection means 202 of the rising edge detection means 215. Acceleration signal generating means 204 for generating an acceleration signal by receiving an output pulse W2 of the < RTI ID = 0.0 >), < / RTI > the search off signal SHOP output of the falling edge detecting means 211 and the rising edge detecting means 215. Receives the detection pulse (W4) and generates a brake signal. And a brake signal generating means 212 for outputting the acceleration signal, the acceleration signal, the brake signal, and the reverse signal REV to receive the acceleration signal when the reverse signal REV is in a passive state. When the brake signal is the first current source control signal TC1, the reverse signal REV is active, the acceleration signal is the first current source control signal TC1, and the brake signal is the second current source control signal. And a second signal generating means (302) for outputting as (TC2). 2. The servo motor driver (104) according to claim 1, wherein the servo motor (104) receives the search signal (SH) and grounds the sled error signal (SE), the third switching means (SW3), the node (n), and the first current source ( A first switch means SW1 for receiving IS1, a second current source IS2, a first current source control signal TC2, and transferring the first current source IS1 to the node n, and the second Second switching means SW1 for receiving the current source control signal TC2 and transferring the second current source TS2 to the node n, and receiving the sled error signal SE, non-inverting and amplifying as necessary. And an amplifying means (303) for receiving the signal of the node (n) and inverting and amplifying the motor driving signals (MM1, MM2) as necessary to generate and output the motor driving signals (MM1, MM2). 3. The reverse signal REV of claim 2, wherein the first signal generation means 301 receives the first ohmic signal Q1 as the input terminal XO and the second ohmic signal Q2 as the input terminal X1. A first mux 206 for selecting an input signal of the input terminal X1 when the active state is selected, and selecting an input signal of the input terminal X0 when the reverse signal REV is a passive state; Q1) is received at the input terminal Y1 and the second ohmic signal Q2 is received at the input terminal Y0 and selectively outputted by the reverse signal REV, when the reverse signal REV is in the active state. A second mux 207 for selecting an input signal and selecting an input signal of the input terminal Y0 when the reverse signal REV is in a passive state, and outputting the output of the first mux 206. A signal converting means 208 that receives the output of the 2 mux 207 as a clock and latches only the rising edge of the second mux 207 and outputs it; An optical high-speed search device for a laser disk, comprising: an inverter means (209) for inverting and outputting the output of the first mux (206). The method of claim 2, wherein the second signal generating means 302 receives the brake signal output of the brake signal generating means 212 to the input terminal W0 and receives the acceleration signal output of the acceleration signal generating means 204 to the input terminal W1. Receives the reverse signal REV to the selection signal input terminal S, selects the signals of the input terminals W0 and W1, and outputs the signals as the first current source control signal TC1 when the reverse signal REV is in an active state. A third mux 205 for selecting a signal of the input terminal W1 and selecting a signal of the input terminal W0 when the reverse signal REV is in a passive state, and an acceleration signal of the acceleration signal generating means 204; Receives the output to the input terminal (Z0) and receives the brake signal output of the brake signal generating means 212 to the input terminal (Z1) to be selected by the reverse signal (REV) and output as a second current source control signal (TC2), the reverse When the signal REV is active, the signal of the input terminal Z1 And a fourth mux (213) for selecting the signal and selecting the signal of the input terminal (Z0) when the reverse signal is passive. 4. The optical high-speed search apparatus for a laser disk according to claim 3, wherein the amplifying means (303) comprises an inverted differential amplifier (AMP) having a feedback resistor (R1) and a signal resistor (R2). The optical high-speed search apparatus of claim 1, wherein the opic (107) is fixed to the pickup (108) and the encoder (106) is installed around the driving of the opic (107). In the optical high-speed search method of a laser disk, when the search key data is input, the search signal (SH) is set to be active, and after calculating a destination, the forward (inner) direction is reversed when its position moves to the current position. A first process of checking whether the direction is reverse, and a second process of setting a reverse signal REV as passive if the position to be moved in the first process is reverse, and actively setting the reverse signal REV if the moving position is not reverse. And a third process of calculating a breakpoint, which is a time point of decelerating the search speed after performing the second process, based on the destination position calculated in the first process, and outputting the calculated value as breakpoint data (RFDT). After checking that the search off signal SHOP is input after performing the third process, if the value is input, the search signal SH set in the first process is reset and then terminated. Method characterized in that it consists of a fourth step. ※ Note: The disclosure is based on the initial application.