JPS6246479A - Digital audio disk player - Google Patents

Abstract

PURPOSE:To speed up retrieving using a memory with small capacity by storing a part or all of starting position information of each piece of recorded music, taking out the music starting position information selectively and adding them, and changing the position of a reading device by addition output. CONSTITUTION:Retrieval information of innermost circle of a disk is reproduced beforehand and starting position information of each piece of music is stored in a memory 15. At this time, a memory, for instance, for 20 pieces of music is prepared, and retrieval information for more than 21 pieces of music is not stored. An operating section 18 gives instruction to retrieve each piece of music, ad a shifting conrolling section 16 reads out rtrieval informationof music number for which retrieving is instructed by the memory 15, makes rough retrieving by moving a pickup 12, and then retrieving is completed at the position by a track jump controlling section 17. In tetrieving pieces of music which are not stored, the controlling section 16 estimates the starting position of music to be retrieved rough estimation information. In such a way, retrieving can be sped sped up using a memory of small capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to speeding up random access (song search) in a digital audio disc player.

2. Description of the Related Art In recent years, digital audio disc players have rapidly become popular, especially compact discs, and at the same time, they have become more sophisticated, such as high-speed random access.

Hereinafter, an example of the above-mentioned conventional digital audio disc player (hereinafter simply referred to as a player) will be described with reference to the drawings.

FIG. 2 shows the configuration of a conventional player. In FIG. 2, 1 is a digital audio disc, and 2 is a pickup, which is a reading means for converting signals recorded on the digital audio disc into electrical signals. 3
Reference numeral 4 indicates a transport means for moving the pickup 2 in the radial direction of the digital audio disc 1; 4 indicates a reproducing unit that reproduces the search position information recorded on the digital audio disc 1 from the pickup output; 5 indicates a reproducing unit from the output of the reproducing unit. A memory for extracting and storing starting position information of each side recorded on the digital audio disc 1; 6;
7 is a transfer control unit that retrieves the start position of an arbitrary song from the memory 6 and operates the transfer means 3 according to the value; 7 is a track jump control unit that transfers the pickup 2 one track or several tracks at a time on the digital audio disc 1; 8 is a track jump control unit This is an operation section for the user to instruct the player to search for songs.

The operation of the conventional player configured as described above will be explained below.

First, Table 1 shows an example of location information for search recorded on a digital audio disc (hereinafter simply referred to as a disc). This position information consists of first position information that changes continuously within each song but discontinuously between different songs, second position information that changes continuously throughout the entire song, and the starting position of each side. is composed of index information indicating the position on the second position information axis, and all of this information is recorded in units of 1 minute and 1/75 second (frame).

Each side is recorded in order from the inner circumference of the disc to the outer circumference (
(That is, reproduction is performed from the inner circumference to the outer circumference.) The index information is recorded on the inner circumference of the disc from the first song.

(Left space below) Atonement + 0 - Mugi Confucianism - Loli 1 - Mugi In the example shown in Table 1, a total of 6 songs are recorded, and the first song is Oo minute 00 seconds Oo
Frame, 2nd song 06 minutes 10 seconds o6 frame, 3rd song 0
7 minutes 20 seconds 1o frame, the 4th song 09 minutes 25 seconds 15 frames, the 5th song 12 minutes 33 seconds 3o frames, and the 6th song 16 minutes 43 seconds 42 frames indicate the starting position of each side.

The operation of a conventional player configured as shown in FIG. 2 will be described below based on the position information recorded as described above.

First, the index information of the innermost circumference is reproduced in advance, and the starting position information of each surface is stored in the memory 6.

By pressing each key switch on the operating section 8, the user instructs a search on each surface.

The transfer control unit 6 reads out the index information of the song number corresponding to the song number for which the search is instructed from the memory 6, and performs a rough search by moving the transfer means 3 to move the pickup 2 to a position according to the index information. Do the following.

With the above means, it is difficult to position the pickup 2 on the target track due to the eccentricity of the disk and the accuracy of the transport means. Next, the transfer control unit 6 instructs the pickup 2 to play the disc at that position, and moves the pickup 2 by one track or several tracks depending on the positional difference between the track being played and the target track. An instruction is given to the jump control section 7. Reproduction: By repeating track jumps, the target track is gradually moved closer to the target track to complete the search.

In the search method described above, the coarse search in which the pickup 2 is moved according to the index information can be speeded up by increasing the movement speed of the pickup 2, but it is difficult to accurately position the pickup 2 to the target track. It is. When searching by repeating playback and track jumps,
For files that require more than a certain amount of reading time to play (1 frame (1/7
5 seconds) or more) Search speed cannot be increased. Therefore,
Generally, as mentioned above, the speed of the search is increased by combining the two search methods.

Typically, up to 99 songs can be recorded on a disc. Therefore, the memory 5 of the player must be provided with 99 songs. However, the memory 6 is generally limited in capacity because it uses the internal memory of a microcomputer built into the player.

Therefore, until now, the capacity of the memory section has been reduced to store up to a certain number of songs, and not to store more than that number. For example, a memory for 20 songs is prepared, and if 20 or more songs are recorded, index information after the 21st song is not stored.

When searching for more than 20 songs, high-speed pickup and transfer based on index information is not possible, so the search speed is slow, such as by repeating playback and trunk jump.

Problems to be Solved by the Invention In conventional players, as mentioned above, in order to increase the search speed for all songs, it is necessary to increase the capacity of the memory 5, which increases the cost of the player. If you try to lower the cost of , the drawback is that you cannot increase the search speed for all songs.

In view of the above-mentioned problems, the present invention provides a player that is low cost and can search all songs at high speed.

Means for Solving the Problems In order to solve the above problems, the player of the present invention includes a reading means (pink-up), a reproducing means for reproducing the search signal from the pickup output, and a reproducing means for storing the index information. The apparatus includes a storage means (memory), an adder for adding the index signals stored in the memory, and a transport means for transporting the pickup at high speed in accordance with the output of the adder.

Effect of the present invention With the above-described configuration, the capacity of the memory section is reduced, index information is stored up to a certain number of songs, and when searching for songs that are not stored, the stored index information is added. By predicting the starting position of the song and moving the pickup to the predicted position at high speed, it is possible to search all songs at high speed even if the memory unit has a small capacity. ' Embodiment Hereinafter, a player according to an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 shows the configuration of a player in an embodiment of the present invention. In FIG. 1, 11 is a digital audio disk (hereinafter referred to as a disk), and 12 is a reading means for converting signals recorded on the disk 11 into electrical signals by a pickup. 13 is a transport means for moving the pickup 12 in the radial direction of the disk 11; 14 is a playback unit that plays back position information for search recorded on the disk 11 from the output of the pickup; 15 is a transfer unit for moving the pickup 12 in the radial direction of the disk 11; 16 is a memory for storing the starting position information (index information) of each side recorded in the memory 15 or an adder and a transfer means 13 according to the force, which will be described later.
17 is a track jump control section that moves the pickup 12 one track or several tracks at a time on the disk 11; 18 is an operation section for the user to instruct the player to search for a song; 19 is an adder. be.

The operation of the player configured as above will be explained.

In advance, the index information on the innermost circumference of the disc is reproduced, and the starting position information of each side is stored in the memory 15. On this occasion,
The memory capacity is limited according to the RAM capacity of the built-in microcomputer, so that, for example, memory for 20 songs is prepared, and index information for 21 or more songs is not stored.

By pressing each key switch on the operation section 18, the user instructs a search on each surface.

First, the operation when searching for a song for which index information is stored in advance will be described below.

The transfer control unit 16 reads the index information of the song number corresponding to the song number for which the search is instructed from the memory 15, and performs a rough search by moving the transfer means to move the pickup 12 to a position according to the index information. [Search. Next, play disc 11 once at that position, and compare the track being played and the target track.
: One track or several tracks depending on the position difference
By repeating playback and track jump, the search is gradually brought closer to the target track and the search is completed.

Next, the operation when searching for a song for which index information is not stored will be described below.

The transfer control unit 16 uses an adder 19 to approximately estimate the starting position of the song to be searched.

For example, assume that index information for songs 1 to 2o is currently stored, and a search is to be made for the 40th song.

The index information for the 20 songs indicates the length from the start position of the first song to the end point of the 19th song. Similarly, the index information for the second song indicates the length from the start position of the first song to the end of the first song. Assuming that all songs are of equal length, the search information for 40 songs is equal to the length of 39 songs, so 39 = 19 + 19 + 1 (index information for 20th song) + (index information for 20th song) + (
The index information for the 40th song can be approximately estimated by adding the index information in the following manner: 2nd song index information) = 4040 song index information.

In accordance with this approximate information, the pickup 12 is transported at high speed, and then the pickup 12 is gradually brought closer to the target track through nine repetitions of playback and track jump, thereby completing the search.

We took the 40th song as an example, but the same applies to other songs for which index information is not stored.If we consider the 99th song as an example, 98=1 9+1 9+1 9+1 9+1 9+3 (index information for the 20th song)+ (20th track index information) + (
20th track index information) + (20th track index information) + (2
It is possible to roughly estimate 9999 song index information by adding (index information for the 0th song) + (index information for the 4th song).

? -01 Sea urchin・By estimating index information・High
In order to be able to bring the pickup 12 closer to the target position in 1st gear, it is possible to move the pickup 12 closer to the target position by repeating '1'''-) ra-) l-) qy7' over a long distance, as in the conventional example. L
& dE et al. 71″′″:! -0 required dEe<'&su・dog"'Search 0 fast.

It is something that can be transformed.

For rough estimation, the length of each side is approximately equal.
In digital audio discs that handle music information, the lengths of each side are often approximately equal, so in practice, the approximate value is the actual start of the song. It is not often that the location is far away.

Furthermore, the memory 6, adder 19, and transfer control section 16 shown in this embodiment may be replaced by a microcomputer.

As described above, according to this embodiment, by providing the adder 19 that adds the index information stored in the memory 6, it is possible to speed up the search for songs for which index information is not stored.

Effects of the Invention As described above, the present invention provides a reading means (pickup) for reading signals recorded on a disk, a reproducing means for reproducing a search signal from the pickup output, and a storage means for storing index information. (memory), an adder for adding the index signals stored in the memory, and a transport means for transporting the pickups at high speed according to the adder output. It is possible to provide a player that allows searching.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of a player according to an embodiment of the present invention, and FIG. 2 is a block diagram of the configuration of a conventional player. 11...Digital audio disc, 12.
...Pickup, 13...Transportation means, 14...
...Playback section, 15...Memory, 16...
...Transfer control section, 17... Trunk jump control section, 18... Operation section, 19... Adder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 11--°Disiguru
7 Huatu 7・

Claims (1)

[Claims] a reading means for reading a signal recorded on a digital audio disc; a reproducing means for reproducing a search signal recorded on the digital audio disc from the output of the reading means; a storage means for storing part or all of the start position information of each song recorded on the disk; an addition means for selectively extracting and adding the song start position information stored in the storage means; A digital audio disc player comprising: a transfer means for changing the position of the reading means with respect to the digital audio disc according to the output of the adding means.