JP2609160B2 - 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 the TOC. In addition to the setting, the movement mode of the optical pickup from the lead-in to the program area when the lead-in enters is set to be the same as the movement mode when the lead-in re-enters.

Therefore, according to the present invention, the optical pickup is re-moved from the lead-in to the program area by the traverse if the movement mode of the optical pickup at the re-entry of the lead-in is the traverse, and by the track jump if the movement mode is the track jump. Since the movement amount at that time is set smaller than the movement amount set by the completion of TOC reading, the access time required to start the specified song near the lead-in can be shortened and the access can be performed accurately. Have.

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,
Traverse transmission of N tracks, which is the amount of movement of the optical pickup set in advance for access after reading the TOC, is performed in step 5.

If the player has entered the program area, that is, if it is a re-entry of the lead-in, it is determined in step 6 whether or not the re-entry into the lead-in has been performed in the track jump mode. In step 7, traverse feed of, for example, N / 2 tracks smaller than N tracks is performed in step 7. If the lead-in re-entry is performed in the track jump mode, a smaller number of, for example, N / 4 track jumps is sent in step S8.
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, it is in the program area, the current position is read and the number of tracks up to the target track is calculated (step 9). Then, access is performed so as to reach the track number (step 10), and it is determined in step 11 whether or not the target track is actually reached. If it does not reach, it returns to step 9 and repeats the operation. If it reaches, it enters the play mode and plays the specified music.

As described above, according to the above-described embodiment, it is determined whether or not the lead-in re-entry is performed by determining whether or not the user has entered the program area after reading the TOC. Judgment of the movement mode of the optical pickup at the time, and if the movement mode is traverse, the traverse feed of N / 2 tracks which is half of the traverse feed of N tracks which is the movement amount of the optical pickup after reading TOC Is performed, and when the movement is performed by the track jump, the track jump is performed by N / 4 smaller tracks, so that there is an advantage that the music near the lead-in can be quickly and accurately accessed.

As is clear from the above embodiment, the present invention sets the amount of movement of the optical pickup from the lead-in to the program area when re-entering the lead-in to be smaller than the value set by the completion of the reading of the TOC. Since the movement mode of the optical pickup from the lead-in to the program area when entering the lead-in is the same as the movement mode when re-entering the lead-in, access to songs near the lead-in when re-entering the lead-in In a short time, and it is possible to shorten the access time required for starting the music in the compact disc player.

[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. And the same mode as the movement mode when reentering the lead-in is used for the movement mode of the optical pickup from the lead-in to the program area when re-entering the lead-in. Access method of the compact disc player.