JP2609159B2 - How to access a compact disc player - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for accessing a compact disc player.

2. Description of the Related Art A compact disc player is provided with a function of selecting an arbitrary tune from among a large number of tunes recorded on a disc, so that the tune can be quickly accessed.

On the compact disc, a signal indicating the start of each song is recorded at the position where the performance of each song is started. Is recorded. On the other hand, the TOC (Table O
A track area called a lead-in is provided in which a song number, playing time, and an absolute time from the first song are recorded.

Therefore, when accessing, the optical pickup first starts from the lead-in of the disc mounted on the player.
The microcomputer reads out the TOC and stores it in the memory, then calculates the number of tracks up to the target track where the specified song starts according to the song number specified from the operation unit, and moves the optical pickup to that position. ,
When the position approaches the position, the light beam of the optical pickup is moved to search for a target track, and when the light beam matches the target track, the music is reproduced. The song can be specified by random program selection from a plurality of songs at random from the inside to the outside of the disc and from the outside to the inside.

Problems to be Solved by the Invention By the way, when the above-mentioned random program music selection is performed, when the performance of one music is completed and the next music is reproduced, the performance start position of the music is located near the lead-in. In such a case, the light beam of the optical pickup may re-enter the lead-in.

After the TOC reading is completed, the value of the coarse feed from the lead-in to the program area in which a plurality of songs are recorded is set in advance so that the program area can be accessed at high speed. Therefore, as described above, when the light beam reenters the lead-in again during the beginning of the song, despite the fact that the optical pickup is located near the performance start position which is the access target value, Since the absolute time of the lead-in itself is not written in the lead-in, coarse feed is performed according to the value determined as described above, and instead, a place far from the performance start position of the song is accessed. Sometimes.

The present invention solves such a conventional problem, and when a light beam re-enters the lead-in from the program area, an excellent compact disk that can shorten the access time to the beginning of a song from the lead-in. An object of the present invention is to provide a method of accessing a player.

Means for Solving the Problems In order to achieve the above object, the present invention reduces the amount of movement of the optical pickup from the lead-in to the program area at the time of re-entry of the lead-in to a value smaller than the value set by the completion of reading of the TOC. It is something to set.

According to the present invention, the moving amount of the optical pickup from the lead-in to the program area when re-entering the lead-in is set smaller than the moving amount of the optical pickup from the lead-in to the program area when the TOC reading is completed. Therefore, there is an effect that the access time required for starting the designated music near the lead-in can be reduced.

Embodiment FIG. 1 is a flowchart for explaining an access operation in one embodiment of the present invention.

When starting the operation, first, in step 1,
It is determined whether or not the current position of the optical pickup is located at the lead-in. If it is located in the lead-in, it is determined in the next step 2 whether or not the reading of the TOC has been completed. If the reading of the TOC has not been completed, the reading of the TOC is performed in step 3 and the process returns to step 1. If the reading of the TOC has been completed, it is determined in step 4 whether the program area has been entered.

If you have never entered the program area, that is, it is the first time to start playing after loading the disc in the device,
In step 5, a traverse feed of N tracks, which is the moving amount of the optical pickup set in advance for the access after reading the TOC, is performed.

If the program area has been entered, that is, it is a re-entry of the lead-in, a traverse transmission of, for example, N / 2 tracks smaller than N tracks is performed in step 6. In any case, the operation is repeated until the light beam enters the program area by the feed according to the value.

If it is determined in step 1 that the optical pickup is not located at the lead-in, that is, the optical pickup is in the program area, the current position is read and the number of tracks up to the target track is calculated (step 7). Then, access is performed so as to reach the number of tracks (step 8), and it is determined in step 9 whether or not the target track is actually reached. If it does not reach, it returns to step 7 and repeats the operation. If it does, it enters play mode and plays the specified music.

As described above, according to the above-described embodiment, the determination as to whether or not the lead-in re-entry is performed by determining whether or not the player has entered the program area after reading the TOC. Since the traverse feed of N / 2 tracks is performed with respect to the traverse feed of N tracks, which is the moving amount of the optical pickup, there is an advantage that the music near the lead-in can be quickly accessed.

As is clear from the above embodiment, when the present invention reenters the lead-in from the program area, the lead-in distance from the lead-in to the program area after the TOC reading is completed is smaller than the lead-in value. Since the value of the movement amount of the optical pickup from the lead-in to the program area at the time of re-entry is set small,
Access to a specified music piece near the lead-in can be performed in a short time, and the access time required to start the music piece in the compact disc player can be shortened.

[Brief description of the drawings]

FIG. 5 is a flowchart for explaining an access operation in one embodiment of the present invention. TOC: Address information of the music recorded in the lead-in N: Value of the movement amount of the optical pickup (the number of tracks) set upon completion of reading the TOC for access.

Claims (1)

(57) [Claims] An optical pickup, which is repeatedly moved until the optical pickup reaches the program area from the lead-in area when re-entering the lead-in area from the program area, determines whether the address information recorded in the lead-in area has been read. A method for accessing a compact disc player, wherein the value is set to be smaller than a value set by: