KR930001365B1 - Track jumping method of cdp - Google Patents

Abstract

The method jumps to a certain track that a user wants to listen more rapidly by altering current jump-mode to the previous jump-mode of great track when a pick-up can't search the track even after 16 track, 4 tract or 1 track jump. It includes a capstan motor (2) for driving a compact disk (1), a pick-up (3), a microprocessor (5) for controlling the overall operation of the system, and a D/A converter (8) for converting the signal from a digital signal processor (6) to drive an audio section (7).

Description

Track Jumping Method in Compact Disc Play

1 is a schematic configuration diagram of a compact disc player.

2 is a flowchart for explaining the method of the present invention.

3 is a jump state diagram of a pickup for explaining the method of the present invention.

4 is a pickup jump state diagram for explaining a conventional track jump method.

* Explanation of symbols for main parts of the drawings

1: disc 2: capstan motor

3: pickup 4: analog signal processor

5: microcomputer 6: digital signal processing unit

7: Audio part 8: D / A converter

In the present invention, even if there is damage on the disc when a pick-up for searching for a track during a playback in a compact disc player (hereinafter abbreviated as CDP) performs a jump operation, In particular, the present invention relates to a track jumping method that allows a user to navigate a track. Especially, when a pickup using a counter jumps more than a predetermined number of times and the target position is not reached, the CDP is switched to enable a quick jump. It is about a track jump method.

A CDP is a device for reproducing music recorded as a digital signal on discs of 12 cm and 8 cm, and a schematic configuration thereof is a capstan motor 2 for rotating the disc 1, as shown in FIG. And a pickup 3 for converting data contained in the disk 1 into an electrical signal, an analog signal processor 4 for processing an analog signal output from the pickup 3, and performing an overall control function. A digital signal which receives a predetermined signal from the microcomputer 5 and controls the capstan motor 2 and the pickup 3, and simultaneously processes the capstan motor 2 and the pickup 3 as a signal output from the analog signal processor 4 into a predetermined digital signal. The processor 6 and the D / A converter 8 converting digital voice data output from the digital signal processor 6 into analog signals and outputting audio signals through the audio unit 7 are interconnected. Become The. In addition, in the related art, when a pickup jumps to find a track during reproduction, the number of tracks to jump are compared with each other by comparing the current position with the current position to sequentially jump to a desired position as shown in FIG.

However, in the case of sequential movement in this way, when the disc is damaged, the jump movement of the pickup does not become as much as the desired track, and the movement to the abnormal position frequently occurs, which takes a long time to find the desired position.

That is, if the jump error occurs due to the damaged part during the 4 track jump in FIG. 4 and moves to the A position, the pickup is jumped by one track according to the sequential jump order, and thus a lot of time is required to move from the A position to the desired B position. This is what it takes.

In addition, the CDP, which finds and reads data by using the pickup, has a weak disadvantage in vibration, and there is a problem in that the pickup moves to a portion without a disk due to the vibration and an error may occur.

The present invention has been made in order to solve such a conventional problem, and if the desired position is not found even after jumping a certain number of times in 16 track jumps, 4 track jumps, and 1 track jump, the current jump mode is changed to the previous large. It is an object of the present invention to provide a track jumping method in a CDP to change the track jump mode so that a user can quickly find a target position on which a desired song is loaded. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. As follows.

As shown in Figs. 1 and 2, the method of the present invention detects whether the current position of the pickup 3 which jumped the track of the disc 1 is larger than the target position in the microcomputer 5, A first step of sequentially detecting whether the mode is 0 or 1, 2 or 3, 4 to 6, 7 to 9, and 10 to 12 modes; and in the first step, the current pickup mode is 0 or 1 mode or 2 Or jump 3 tracks to 256 or 64 tracks out of each mode in 3 mode, and then switch to mode 1 or 3 in mode 4 respectively. And if it is "4", the mode is changed to 3, and if it is not "4", the current count value is increased to "1". In 9 mode, the pickup is jumped 4 tracks outward. If it is set to 9 and detects whether the count value of the counter is "4", and if it is "4", the mode is changed to 6, and if it is not "4", the current count value is increased by 1, and the mode As a result of detection, if the current mode is 10 to 12 mode, the pickup is jumped 1 track to the outside, then the mode is set to 12. If the counter value is 4, then the mode is changed to 9. If it is cleared to 0 but the count value is not "4", the current count value is increased by one, and the second mode of returning and the current mode of the pickup are smaller than or equal to the target position in the first step. 0 or 2, 1 or 4, 3 or 7, 6 or 10 and 9 or 12 or 13 are sequentially detected and set or returned in that state as the pickup is in the target track position or in 9 or 12 or 13 mode. Process 3, and in the third process, the current pickup mode is 0 or 2. Or 1 or 4, jump the pickups by 256 tracks and 64 tracks, respectively, and then switch each mode to 2 or 4, and if the mode is detected as 3 or 7 mode, jump the pickup 16 tracks inward and then set the mode to 7 After that, if it is detected that the count value of the counter is "4", if it is "4", the pickup mode is changed to 4, but if it is not "4", the current count value is increased by one. Alternatively, if 10, jump the pickup 4 tracks inward, switch the mode to 10, then detect if the counter value is "4". If "4", switch the pickup mode to 7 and clear the count value to 0. If it is not "4", increase the count value of the counter by 1. If the current mode is 9, 12, or 13 as the result of the mode detection, move the pickup 1 track inward, switch the mode to 13, and then change the counter value to " 4 "is detected and" 4 " When the pickup mode is changed to 10 and the counter value of the counter is cleared to 0, but the counter value is not "4", it is a fourth step of increasing and returning the current counter value by one. It will count the numbers that are jumped into the built in.

When explaining the operation and effect of the method of the present invention made with such a process with reference to Figures 1 and 3 as follows.

First, when the pickup in the CDP is moved to the area without the reflector, which is the bottom end area of the disk, due to vibration or shock, if the data is not obtained, the pickup is detected and moved to the inside of the disk where the data is located to prevent the error. In the program controlling the pickup 3 connected to the digital signal processing unit 6 by a program built in the microcomputer 5, if the pickup is not focused on the disc while the pickup is focused a certain number of times (four times). It is determined that the disk has been moved to the area where the disk does not exist, and the entire pickup is moved at regular intervals to find the disk again.

That is, the present invention is a method of focusing by moving the pickup to the inside of the disk having a certain interval data when the focus is not focused even if the pickup is focused four times or more in the outside of the disk or in the absence of data. will be.

In general, CDP discs are handled by the user by hand, so the damage rate is very high. If a disc is damaged, an error will inevitably occur when reading data by pickup and performing the next operation.

That is, when the pickup jumps to find a desired song among the songs contained on the disc, it takes a lot of time to find the desired position as the pickup jumps to an undesired place due to the damage of the disc. As shown in the flow chart shown in Figure 1, you can quickly change the mode to find the desired position.

In other words, if the pickup does not find the desired position after a certain number of jumps in 16, 4, and 1 track jumps as shown in Fig. 3, the current jump mode is changed to a larger track jump mode. If you jump to the desired position with one track jump during abnormal operation due to the damaged part, it takes a lot of time, so if you do not reach the desired position even after jumping a certain number of times by one track By changing the 16-track to jump mode, you can get there quickly.

In the microcomputer 5, the current pickup compares the position with the target value, and if the target value is large (as can be seen from the time data), the pickup is jumped outward to find the desired position, and if the target value is small, the pickup is jumped inward. In this case, the pickup jumps a track by a jump command of 256, 64, 16, 4 and 1 tracks.

If the pickup is incorrectly moved due to an error due to damage to the track while the pickup is jumped by a predetermined track as described above, the microcomputer 5 as in the 16 track jump, the 4 track jump and the track jump mode. If the pickup continues to jump the current track value more than 4 times using the counter inside, the jump mode can be changed to the previous jump mode to find the desired track quickly.

For example, if you have jumped 4 or more tracks 16 times by 16 track jump command and cannot find the location you want, change the mode to jump 64 tracks.If you have jumped 4 times or more with 4 track jump command, If you do not find the desired position even though you jumped 4 times or more in 1 track jump mode, change the mode 4 to jump by 4 tracks so that the pickup moves to the front or the outside. You can find the location you want in a short time.

As described above, according to the method of the present invention, when damage occurs in the disc used in the CDP and the desired position cannot be found, the pickup changes the jump mode larger than the current jump mode to the previous jump mode, and the desired position is again. By visiting the user can find the location where the user's favorite song is loaded in a short time, thereby improving the reliability of the product.

Claims (1)

The microcomputer 5 detects whether the current position of the pickup 3 which jumped the track of the disc 1 is larger than the target position, and if the current position is large, the current mode is 0 or 1, 2 or 3, 4 to 6, 7 A first step of sequentially detecting whether to the modes 9 to 9 and 10 to 12, and if the current pickup mode is 0 or 1 mode or 2 or 3 mode in the first step, the pickup is jumped 256 tracks and 64 tracks outward, respectively. After each mode is switched to 1 or 3 mode, if the current mode is 4 to 6 mode, the pickup is jumped 16 tracks outward, then the mode is changed to 6, and then the counter value is detected as "4". If it is "4", the mode is changed to 3, if it is not "4", the current coefficient value is increased to "1". If the current mode is 7-9, the mode is detected. After detecting that the count value of the counter is "4" If it is "4", change the mode to 6 and set the count value to "0", but if it is not "4", increase the current count value by 1, and if the current mode is 10-12 mode, pick up 1 track outward. After jumping, set the mode to 12 and then detect whether the counter value is "4". If it is "4", switch the mode to 9 and clear the counter to 0. If the counter value is not "4", the current count value And a second process of returning 1, respectively, and returning the current mode to 0 or 2, 1 or 4, 3 or 7, 6 or 10 and 9 if the current position of the pickup is less than or equal to the target position in the first process. Or a third process of sequentially detecting 12 or 13 and setting and returning in the 9 or 12 or 13 mode or in the state because the pickup is in the target track position, and the current pickup mode is 0 or 2 in the third process. , Or 1 or 4, it will pull the pickup in 256 tracks and Jump each 64 tracks, and then switch each mode to 2 or 4, and if the mode is detected as 3 or 7 mode, jump the track 16 tracks inward and then switch the mode to 7 and then the counter value is "4". If it is detected as "4", the pickup mode is changed to 4, if it is not "4", the current count value is increased by 1, and if the current mode is 6 or 10, the pickup is moved 4 tracks inward, then the mode Is changed to 10. Then, it is detected that the counter value is "4". If it is "4", the pickup mode is changed to 7, and the counter value is cleared to 0. If the current mode is 9, 12, or 13, the pickup is jumped 1 track inward, then the mode is switched to 13, and if the count value of the counter is 4, the pickup mode is Count value of counter after switching to 10 Sikidoe cleared to 0, the coefficient value is not "4" track jump method of the compact disk player, characterized in that comprising a fourth step of increasing the current in the first coefficient value and returns.