JPH04126386U - Resume playback device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the connection with the song that was being played earlier when the power is turned off and turned on again during playback. [Structure] A servo device that moves the optical pickup and reads the EFM signal of the disk, a signal processing device that demodulates the EFM signal and extracts subcode information such as track number and A-TIME (total elapsed playing time), It is equipped with a control device that controls these and a switch that specifies resume playback, and when the power is turned on again, it reads the track number and A-TIME at the optical pickup position, then reads the TOC, and then reads it first. If the remaining amount time T of track number N-1 is longer than a predetermined time Td, the device resumes playback from track N-1, and if it is shorter, resumes playback from track N.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to resume playback of compact disc players. be.

0002

[Conventional technology]

Car-mounted compact disc players and portable compact discs ・When playing the player in a car using a car battery, the error may occur during playback. Every time you turn off the engine, start the engine again, and start playing, the first track song will be played. They were playing. Therefore, frequently getting in and out of the car (turning the engine on and off) There was a problem where the same song would always be played. to solve this , if you turn off the power while playing, turn it on again, and play, the track you were listening to previously will be played. A function that plays the song from the beginning is adopted, and is generally called the resume playback function. ing. There are the following two methods for realizing this resume playback. (a) Store the track number and A-TIME (total elapsed playing time) in memory, and turn off the power. Even if the data is lost, the information is backed up and resume playback is performed using that information. (b) Do not move the optical pickup position after the power is turned off, and when the power is turned on again is the track number and A-TIME (total elapsed playing time) from that position before reading the TOC. ) and resume playback based on that information.

0003

[Problem that the idea aims to solve]

(a) above requires some kind of backup element, and (b) requires a pin The backup slide feed system avoids backlash caused by eccentricity and backlash. Therefore, the playback location cannot be accurately detected when the power is turned off. Therefore, If you turn off the power near the point where the rack number changes from (N-1) to N, the computer will not resume. During live play, it was unclear whether to play from track number (N-1) or from N. . If the power is turned off at the end of track number (N-1), There is little time left on the track, so even if you resume playing from track N, the movement will not continue. There is no problem as such. However, when I turned off the power at the beginning of track number N, When resuming playback from rack number (N-1), the connection of movements feels strange. was there.

0004

[Means to solve the problem]

This invention does not use a backup element and turns off the power at the end of the track (N-1). If so, resume playback from track (N-1) or resume playback from track N. -Allows for undefined playback, but turns off the power immediately after entering track N. If the If you select resume playback using a constant switch, etc., turn off the power and then restart the optical pickup. The track number and A-TIME can be changed from that position when the power is turned on again without moving the position of the track. (total elapsed playing time) and then read the TOC. track number read (N-1), here, the remaining time T of the track (N-1) is a certain fixed time. If it is longer than Td, resume playback from the beginning of track (N-1), and if T is longer than Td. If it is shorter than , resume playback starts from the beginning of track N. Here, the time Td is The pickup slide feed system may be affected by eccentricity or play due to backlash, etc. A-TIME (total elapsed performance time) read before turning off the power and after turning it on again. This is determined based on the error in track N, even if the power is turned off immediately after entering track N Select the value to resume playback from.

[0005]

【Example】

In this example, the effects of eccentricity of the pickup slide feed system and backlash will be If the maximum play due to That's 62.5 tracks. Rotation speed on the inner circumference is 500 rpm, and on the outer circumference is 25 If the speed is 0 rpm, the playing time for 62.5 tracks is 62.5 x 60 on the inner circumference. ÷500=7.5 seconds, and outer circumference 62.5×60÷250=15 seconds. subordinate Therefore, Td was set to about 15 seconds and resume playback was performed according to the flowchart in Figure 1. cormorant.

[0006]

[Effect of the idea]

According to this invention, even if the power is turned off, the pickup position does not move and the power is turned on again. Then, the remaining time of the track number is read, determined from a predetermined value, and resumed. playback, and the connection between the song that was being played earlier and the playback operation without using a backup element. Allows for quick and easy resume playback.

[Brief explanation of drawings]

[Fig. 1] Flowchart showing one embodiment of the present invention

Claims (1)

[Scope of utility model registration request] Claim 1: A servo device that moves an optical pickup, drives an actuator, and reads the EFM signal of the disk, and a servo device that demodulates the EFM signal and determines the track number and A-TIME.
It is equipped with a signal processing device that extracts subcode information such as (total elapsed performance time), a control device that controls them, and a switch that allows the user to select resume playback. In this case, when the power is turned off and then turned on again, without moving the pickup, read the track number and A-TIME (total elapsed playing time) at that location, then read the TOC, and select the track number (N-1) that was read first. ) is longer than a predetermined time Td, resume playback is performed from track (N-1), and if it is shorter, resume playback is performed from track N. playback device.