JPH01236462A - Reproduction method for cd player - Google Patents

Abstract

PURPOSE:To instantaneously reset an error state where the same position is played many times to a normal state by setting the reproducing position at a point ahead of the position shown by the time data in case the count value of the reading frequency of the same time data exceeds a prescribed level. CONSTITUTION:A control microcomputer 5 counts the frequency of the same time data (x) read out of a signal processing circuit 4. When this count value N exceeds a prescribed level, an optical pickup 2 is moved to a position ahead of the position shown by the data (x) by a several seconds via a feed servo circuit 9. Then the reproduction is started again at said advanced position. Thus it is possible to instantaneously reset an error state where the same position is reproduced many times during the reproduction of a CD disk to a normal state. In such a way, the reproduction can be continued without giving any unnatural feeling to an operator.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a reproducing method for a CD player, and more particularly to a reproducing method for a CD player that can detect an error state that occurs during reproducing a CD disc and restore normal operation.

<Prior Art> On a CD disc, a subcode Q including absolute time data from the beginning, a song number, each player's performance time, etc. is recorded simultaneously with music data.

FIG. 3 is a schematic diagram for explaining the time data of the subcode Q recorded on the CD disc.As shown in FIG. 0, time data x, x+1, .・
... is recorded, and the time data is updated every second.

Also, one second is divided into 75 parts, 1/75 second (=13, 3
The signal processing unit transfers time data to the control microcomputer every time (m5ec), and the control microcomputer causes the display unit to display the time.

By the way, while playing on a CD player, for some reason (for example, due to deposits, etc.) the same position on the disc may be played over and over again, and the player cannot proceed beyond that position. Conventionally, when such a situation occurs, the operator searches for the next song or performs a fast forward operation to skip over the repeated performance portion.

<Problems to be Solved by the Invention> However, such conventional systems are completely dependent on the operator's operations, and in the case of in-vehicle CD players in particular, the user is forced to perform key operations such as search while driving.

There was a problem that not only did the burden on the repeater (driver) increase, but also the operability was poor.

In addition, it was impossible to return to the normal state without relying on key operations, and the repeated performance at the same position was very aurally uncomfortable.

In view of the above, when an error condition occurs in which the same position is played over and over again during playback of a CD disc, the present invention immediately restores the normal condition, thereby reducing the burden on the operator and preventing the operator from feeling uncomfortable. The purpose of the present invention is to provide a playback method for a CD player that is not available before.

Means for Solving the Problems> FIG. 1 is a block diagram of the main parts of a CD player that implements the reproduction method of the present invention.

1 is a CD, 2 is an optical pickup, 3 is an RF amplifier, 4 is a signal processing circuit, 5 is a control microcomputer, X is time data, N is a count number, and 9 is a feed servo circuit.

<Function> The control microcomputer 5 counts the number of times the same time data 2. is advanced to a position several seconds ahead of the position indicated by time data X, and reproduction is restarted from this advanced position.

<Example> The present invention will be explained below based on the drawings.

1 and 2 are diagrams showing an embodiment of the present invention. FIG. 1 is a block diagram of the main part of a CD player, and FIG. 2 is a flowchart of the processing of the present invention.

First, to explain the configuration, in FIG. 1, 1 is a CD, and music information and subcode Q are recorded in the CD. The subcode Q includes time data x2 song numbers and each individual's performance time information, and each frame within 1 second (7
5 frames), the time data X is the same. 2 is an optical pickup that reads data from the CDI, 3 is an R
It is an F amplifier and amplifies the data read out from the optical pickup 2. 4 is a signal processing circuit and RF amplifier 3
A microcomputer 5 performs predetermined processing on the signal from the subcode Q, outputs music information to an audio circuit (not shown), and controls time data X2 included in the subcode Q, song number, playing time, etc.
Output to.

Reference numeral 5 denotes a control microcomputer that controls the entire system, and performs the processing shown in FIG. 2 using, for example, time data X input from the signal processing circuit 4. 5a is a ROM in which a processing routine for implementing the reproduction method of the present invention is stored.

Reference numeral 6 is a RAM in which time data X read from the CDI during playback and a count number N of times when the same time data has been read are written. 7a is a reproduction start key, 7b is a search key, and 8 is a display section.

9 is a feed servo circuit, which is controlled by the control microcomputer 5 to control the position of the optical pickup 2 during random access (search).

As shown in FIG. 3, the time data X of the CDI is the same for each frame that divides one second into 75, and the control microcomputer 5 divides one second into 75 frames, in other words, 13.
Time data X is input from the signal processing circuit 4' every 3 seconds. Therefore, under normal conditions, 75 pieces of time data "X" are input to the signal processing circuit 4 to the control microcomputer 5 per second.

In the present invention, the number of pieces of the same time data It is determined that the position is several seconds ahead of the current playback position (for example, time data x + 2 2 seconds ahead).
) and then enter the play state.

Next, the overall operation of FIG. 1 will be explained according to the processing flowchart shown in FIG.

When the operator attaches the CDI to the player and starts playback, time data X included in subcode Q is read (
Step 101), it is determined whether the time data X has changed (Step 102).

If the time data X has not changed, the count number N is increased (step 103), and it is determined whether the count number N is 100 or more (step 104).

If it is 100 or more, the feed servo circuit 9 is controlled to move the pickup 2 to a position several seconds ahead of the current time data X (
search) and change the playback position (step 105),
Step 10: Restart playback from the changed playback position.
6), return to step 101.

On the other hand, it is determined in step 102 that the time data X is x +
If it changes to 1, the count number N is cleared to 1 and the process returns to step 101.

Further, if the count number N is not 100 or more as determined in step 104, the process returns to step 101, and step 101
Repeat the processes from 104 to 104.

Note that in the case of 1 or more, the performance is resumed by searching several seconds beyond the same repeat position, but the performance may be restarted by searching for the next song currently being played.

<Effects of the Invention> According to the present invention, the number of times the same time data has been read is counted, and if this count exceeds a predetermined number, the playback position is set to a position further ahead than the position indicated by the time data. Since the configuration is configured so that playback resumes from the advanced position, when an error condition occurs in which the same position is played over and over again during CD disk playback, the normal state is immediately restored. This has the excellent advantage of reducing the burden on the operator and allowing reproduction to continue without causing any discomfort to the operator.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of a CD player that implements the playback method of the present invention. FIG. 2 is a flowchart of the process of the present invention. FIG. 3 is a schematic diagram for explaining subcodes recorded on a CD disc. 1. CD, 2. Optical pickup. 3...RF amplifier, 4...signal processing circuit. 5. Control microcomputer. X: Time data, N: Count number. 9... Servo circuit. Patent applicant Alvine Co., Ltd. agent Patent attorney Chiki Saito Figure 2

Claims (1)

[Claims] In a CD player playback method that plays a disc while reading subcode time data, the number of times the same time data is read is counted, and if this count exceeds a predetermined number, the playback position is set to the corresponding time. A reproducing method for a CD player, characterized by advancing the CD player to a position beyond the position indicated by the data, and restarting reproduction from the advanced position.