JPS60253026A - Index detecting device - Google Patents

Abstract

PURPOSE:To detect exactly and quickly an indicated index by providing an optical pickup driving control part, signal demodulating part, and an arithmetic part for calculating a sub-code obtained by demodulating it, and a storage part, to a digital audio disk. CONSTITUTION:A distance between the first point of the next melody of an indicated melody, and the present point is calculated by an operating part 23, and as a result, an optical pickup part 21 is brought to the first point of the next melody of an indicated melody through a driving control part 24. Thereafter, the optical pickup part 21 is made to jump and returned by one track each under the control of the optical pickup driving control part 24, and the last point of the indicated melody is detected. Subsequently, a size of the index obtained at that point and an indicated index is calculated by the arithmetic part 23, the distance is calculated by the part 23 by a length recorded in a storage part 25 from the point where the optical pickup part exists, and the optical pickup part 21 is moved through the driving control part 24. By executing this repetition, the optical pickup part 21 is moved to a point of the indicated index.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an index detection device for a digital audio disc player, particularly a compact disc player.

Conventional configurations and their problems In recent years, there has been a remarkable improvement in the sound quality of audio equipment, and records have also improved.] With the advent of discs, their sound quality and operability have attracted attention, and their widespread use is expected. .

A conventional index detection device will be explained below.

FIG. 1 is a block diagram of a conventional index detection device.
11 is an optical pickup unit that extracts a signal from a compact disc and converts it into an electrical signal; 12 is a signal demodulation unit that demodulates the electrical signal; 13 is an arithmetic unit that operates on the subcode obtained by the signal demodulation unit; and 14 is an arithmetic unit. This is an optical pickup drive control section that performs drive control of the optical pickup based on the results calculated by the section 13.

The operation of the conventional index detection device configured as described above will be described below.

First, the signal recorded on the compact disc is converted into an electrical signal by the optical pickup section 11, the electrical signal is demodulated by the signal demodulation section 12, and the subcode is sent to the calculation section 13. Since there is no way to check in advance where on the disk a specified index exists, the calculation section 13 instructs the optical pickup drive control section 14 to jump a predetermined number of tracks on the disk. and have them do a track jump. Further, the optical pickup section 11 reads the signal from the disk, and if the index differs from the designated index, the track jump is performed again, and the optical pickup is advanced by 1 at the designated index. If the light pink amplifier advances to the next song after the specified song, it will detect that the specified index is an error.

However, in the above conventional configuration, a certain number of track jumps are performed from the first point of the song, so if the specified index is an error, it takes time to determine the error, and the index existing in the second half of the song is When an instruction is given, there are problems in that it takes time to detect the instruction.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide an index detection device that can accurately and quickly detect a specified index and move an optical pickup to that point. .

Structure of the Invention The present invention comprises an optical pickup drive control section that converts signals recorded on a digital audio disk into electrical signals, an optical pickup drive control section that controls the drive thereof, and a signal obtained by the optical pickup section. There is an index detection device that includes a signal demodulation section that demodulates the subcode, a calculation section that performs calculations on the subcode obtained by demodulation, and a storage section that stores the calculation result. (which allows us to accurately and quickly detect the indicated index.

DESCRIPTION OF THE EMBODIMENT FIG. 2 shows a block diagram of an index detection device in an embodiment of the present invention. 21 in Figure 2
22 is a signal demodulation unit that demodulates the electrical signal; 23 is a calculation unit that performs calculations using the subcode of the demodulated signal; An optical pickup drive control section 25 controls the drive of the optical beer 2 fufu 1 section, and 25 is a storage section that records the results of calculations performed by the calculation section 23.

The operation of the index detecting device of this embodiment configured as described above will be explained below.

First, the signal recorded on the compact disc is extracted by the optical pickup unit 21 and converted into an electrical signal. The electrical signal is demodulated by the signal demodulation section 22 and the subcode of the demodulated signal is sent to the calculation section 23.

In the calculation unit 23, the TOC of the sent subcode
The data is recorded in the storage section 25. Note that TOC data is an abbreviation for Table of Contents, and is data that represents the first point of a masterpiece recorded on a disc in terms of time. Then, the first point of the song next to the instructed song is extracted from the TOC data recorded in the storage section 25, the distance from the current point is calculated by the calculation section 23, and the optical pickup drive control is performed based on the result. The optical pickup section 21 is brought to the first point of the song next to the instructed song via the section 24.

Then, under the control of the optical pickup drive control section 24, 1
The optical pickup unit 21 is jumped back track by track to find the last point of the designated song.

Then, the calculation unit 23 calculates the magnitude of the index obtained at that point and the designated index, and if the designated index number is larger, it is determined that the designation is incorrect. If the designated index number is smaller, the calculation unit 23 calculates the length of the designated song from the TOC data, and further calculates the length of A and records it in the third memory unit 25. Next, the calculation unit 23 calculates the distance from the point where the optical pickup unit is located by the length recorded in the storage unit 25, and the optical pickup unit 21 is moved via the optical pickup drive control unit 24, and the distance recorded at that point is The subcode is sent through the signal demodulation section 22 to the calculation section 23, and in calculation 823, the magnitude of the indicated index and the index at the current point are calculated. If the specified index is larger, the length of the rod recorded in the storage unit 25 is calculated, and the optical pickup unit 21 is moved by the distance corresponding to the length of the rod via the optical pickup drive control unit 24. Proceed. If the designated index is smaller, the optical pink-up section 21 is returned in the same way.

By repeating this process, the optical pickup section 2
1 can be moved to the point at the indicated index.

As described above, according to this embodiment, by making the distance over which the optical pickup is moved not constant, it is possible to quickly determine an error in the specified index, and it is possible to quickly move the optical pickup to the position of the specified index. .

Note that the arithmetic unit of this embodiment can also be configured as a microcomputer.

Effects of the Invention According to the present invention, an arithmetic unit is used to detect a specified index, and the optical pickup unit is moved non-uniformly, thereby making it possible to detect an index accurately and quickly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional index detection device, and FIG. 2 is a block diagram of an index detection device according to an embodiment of the present invention. 11... Optical pickup unit, 12 - Signal demodulation unit,
13... Arithmetic unit, 14... Optical pickup drive control unit, 21... Optical pickup unit, 22... Signal demodulation unit, 23... Arithmetic unit, 24... Optical pickup drive control unit, 25...Storage section.

Claims (1)

[Claims] An optical pickup drive controller 11 that converts signals recorded on a digital audio disk into electrical signals, an optical pickup drive control section that drives and controls the optical pickup section, and a signal that demodulates the signal obtained by the optical pickup section. An index comprising: a demodulation section; a calculation section for calculating a subcode of the signal demodulated by the signal demodulation section; and a storage section for storing the results calculated by the calculation section. Detection device.