JPS61255536A - Compact disk player - Google Patents

Abstract

PURPOSE:To produce sound as soon as an indication is issued for start of a play by providing a control part where data are recorded to and read out of a memory and a drive part which drives an optical pickup according to the arithmetic result obtained at said control part. CONSTITUTION:A control part 15 calculates the number of frames included in a round of a disk at a play starting point indicated by the subcode data obtained from a signal demodulation part 12 before the start of the play is indicated. Then reproduced data are written on a memory 13 for the frames calculated by the part 15. When the data equivalent to the number of counted frames are written, the frame is reset while jumping by a single track. Then data are written again on the memory 13 at the indicated play starting point. These data are read out at and after the play starting point when a play starting indication is issued and sent to an analog conversion part 14. An optical pickup part 11 continues the reproduction with an indication for start of the play and writes the reproduced data with the memory 13 defined as a ring memory. Thus the sound can be delivered as soon as the start of the play is indicated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compact disc player that can instantly start playing from a designated location on a compact disc.

BACKGROUND OF THE INVENTION In recent years, compact disc players have been attracting attention for their improved operability and higher sound quality.

An example of the above-mentioned conventional compact disc player will be described below with reference to the drawings. 0 FIG. 2 is a block diagram of a conventional compact disc player, in which 1 is an optical pickup section for reading signals recorded on a compact disc; 2 is a signal demodulation section that demodulates the signal read by the optical pickup section, and 3 is an analog conversion section that converts the digital signal demodulated by the signal demodulation section into an analog signal.

The operation of the compact disc player configured as described above at the time of starting a performance will be described below.

When the play start point is specified, the optical pickup section repeatedly repeats the operation of jumping forward one track when it reaches the specified play start point on the compact disc and tracing the track again. When it reaches the specified performance start point, it advances silently to the specified performance start point and starts producing sound from the performance start point.

Problems to be Solved by the Invention However, with the above configuration, the sound is actually emitted from the time of the instruction to start playing due to the difference between the position of the optical pickup section at the time of instruction to start playing and the specified play start point. In view of the above-mentioned problem, the present invention has the problem that the playback start time is delayed by up to one revolution of the disc. To provide a compact disc player capable of instantly producing sound from a designated play start point when instructed.

Means for Solving the Problems In order to solve the above problems, the compact disc player of the present invention includes a memory for recording data played back from a compact disc, and a memory for calculating subcode data played back from a compact disc. A control unit that records and reads data in memory according to the results;
This device includes an optical pickup driving section that moves the optical pickup based on the result of calculation by the control section.

Effect of the Invention With the above-described configuration, the present invention allows the reproduction signal from the compact disc to be once recorded in the memory, so that when there is an instruction to start playing, it is possible to instantly output the sound from the specified playing start point.

Embodiment Below, a compact disc player according to an embodiment of the present invention will be explained with reference to the drawings.0 Figure 2 shows a block diagram of a compact disc player according to an embodiment of the present invention.0 In Figure 1, 11 is an optical pickup section that reads data recorded on the compact disc; 12 is a signal demodulation section that demodulates the signal read by the optical pickup section; 13 is a memory that records the data demodulated by the signal demodulation section; and 14 is a memory that records the data demodulated by the signal demodulation section. An analog conversion unit 16 converts the digital signal read from the memory into an analog signal, and performs calculations on the subcode data obtained from the signal demodulation unit, and uses the results to instruct the memory to record and read data, and also outputs an optical signal. This is a control unit that instructs the pickup unit to jump the truck.

The operation of the compact disc player of this embodiment configured as described above will be explained below.

First, before the start of play is instructed, the control section calculates how many frames there are in one revolution of the disc at the specified play start point from the subcode data obtained from the signal demodulation section.
The data played back is written into the memory for the calculated number of frames from the specified performance start point. After playing the calculated number of frames, it jumps back one track and writes the data into memory again from the specified playback starting point. When the instruction to start playing is received, the data written in the memory, starting from the playing starting point, is read out and sent to the first analog converter. When the optical pickup section receives an instruction to start playing, it continues playing and writes the played data into the memory as a ring memory.

As described above, according to this embodiment, data for one revolution of the disk is written to the disk from the specified play start point immediately before the play start instruction is issued, so that when the play start instruction is received, If data is read from the memo IJ-, sound can be produced instantly.

Effects of the Invention As described above, the present invention has a memory for recording data reproduced from a compact disc, and calculates subcode data reproduced from a compact disc, and records or reads data in the memory based on the results. By providing a control unit and an optical pickup drive unit that moves the optical pickup according to the results of calculations performed by the control unit, it is possible to start producing sound from the moment an instruction to start playing is given.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a compact disc player according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional compact disc player. 11... Optical pickup section, 12...
Signal demodulation section, 13...Memory, 14...
... Analog conversion section, 15... Control section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A memory that records the data played back from the compact disc, a control unit that calculates the subcode data played back from the compact disc, and records or reads data in the memory based on the results; A compact disc player comprising: an optical pickup drive unit that moves an optical pickup.