JPH08212721A - Disk device - Google Patents

Abstract

PURPOSE: To prevent the discontinuance of sound caused by a retry action by reading the speech data immediately after the speech data related to an error by a reading means when the retry counted value exceeds a preset retry value. CONSTITUTION: A CPU 9 judges whether data error has been generated or not, performs the increment of the counted value of an error counter 6 by +1 when the error has been generated and judges whether the counted value exceeds a preset error value or not. When the counted value does not exceed the preset value, whether the counted value of a retry counter 5 exceeds a preset retry value or not is judged. When the counted value does not exceeds the preset value, an optical pickup 1 is made to execute the retry action to speech data related to the error. The counted value of the counter 5 is made to perform increment by +1. Whether the counted value of a progress counter 8 is 1 or not is judged. When the counted value is 1, it is judged that the remaining amount of the data in a memory 24 is less, and the pickup 1 is made to execute the access action to the speech data immediately after the error.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device for reproducing discs such as compact discs (hereinafter simply referred to as CD) and mini discs (hereinafter simply referred to as MD).

[0002]

2. Description of the Related Art Conventionally, as such a disk device, a C for reproducing a CD on which audio data such as music is recorded is used.
D player is widely known.

In recent years, a CD has been adopted by adopting a method of digitally compressing and recording the audio data.
An MD which is more compact than the above and is capable of recording as well as reproduction has been developed, and an MD player for reproducing such an MD is becoming popular.

A feature of the MD player is that it is superior in vibration resistance to the CD player by mounting a memory on the player side.

The CD player has no measure against vibration, and when a data error occurs due to scratches on the disc or vibration to the player when reading the audio data recorded on the CD, the audio data of the error portion is read. It suffices to execute the reading operation that tries to read again, that is, the retry, but when the retry is executed, the skipping occurs, so the retry cannot be executed, and the skipping is overcome there. Therefore, it has an interpolation function for executing an interpolation operation based on the data before and after the error portion.

On the other hand, the MD player is equipped with a memory as described above and stores voice data in the memory. Even if the data error occurs, the MD player is concerned with the voice data in the error portion due to the retry. Since the audio data in the memory is reproduced until the reading is completed, it is possible to prevent skipping of sounds even if a data error occurs.

Although the MD player has an interpolation function as well as the CD player, the retry operation can be repeatedly executed without depending on the interpolation function as long as the remaining memory capacity permits.

[0008]

However, according to the MD player to which the above-mentioned conventional disc device is applied, continuous data error is caused by, for example, excessive scratches attached to the disc or continuous vibration applied to the player side. If it occurs, the overhead is increased by repeatedly executing the retry operation, the audio data to be stored and held in the memory cannot be read in time, the remaining amount of data in the memory decreases, and in some cases, the sound is interrupted. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a disk device capable of preventing sound interruption due to excessive retry operation.

[0010]

In order to achieve the above-mentioned object, a disk device of the present invention detects reading errors of audio data recorded on a disk in order, and an error related to the read audio data. A signal processing means for storing the voice data in the storage means, reading the voice data from the storage means at a read rate higher than the storage rate of the voice data, and outputting the read voice data as voice; A disk drive having a control unit that causes the reading unit to execute a retry operation when an error related to audio data is detected, and a retry count unit that counts the number of retry operations executed at the time of error detection as a retry count value. Have
The control means stores in advance a retry setting value indicating an allowable limit of the retry count value, and when an error related to the voice data is detected, compares and detects the retry count value and the retry setting value, When the retry count value is equal to or larger than the retry set value, the reading unit is made to read the voice data immediately after the voice data related to the error.

[0011]

With such a configuration, according to the disk device of the present invention, the retry set value indicating the allowable limit of the retry count value is stored in advance, and when an error related to the audio data is detected, the audio data related to the error is detected. The retry count value of the reading means and the retry setting value are compared and detected, and when the retry count value is equal to or more than the retry setting value, the reading means is made to read the voice data immediately after the voice data related to the error. Therefore, it is possible to prevent a decrease in the remaining amount of data in the storage unit due to an excessive retry operation, and even prevent a sound break due to an excessive retry operation.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An MD player to which the disc device of the present invention is applied will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an MD player to which the disc device of the present invention is applied.

In FIG. 1, the MD player optically reads audio data recorded on an MD (hereinafter referred to as a disk) 100 in response to a read drive control signal described later, and converts each read audio data into a high frequency signal. An optical pickup 1 which is a reading means for converting, and a signal processing unit which performs signal processing on the read audio data in accordance with a signal control signal described later to generate a digital audio signal and outputs the generated digital audio signal. 2 and a D / A converter 11 that converts a digital audio signal output from the signal processing unit 2 into an analog signal and outputs the analog signal to an audio output unit (not shown).
0, a mechanical control unit 10 that controls the mechanical mechanism of the entire MD player, and a CPU 9 that is a control unit that controls the entire MD player.

The signal processing unit 2 amplifies the high frequency signal read by the optical pickup 1 and also shapes the waveform of the amplified high frequency signal to convert it into a digital signal. The EFM decoder 22 that demodulates the digital signal from 14 bit data to 8 bit data, and the 8 bit data (compressed data) input from the EFM decoder 22 are stored in the memory 24 that is a storage unit, and It has a memory controller 23 which is a signal processing means for calling and outputting the compressed data stored in 24, and an audio expansion decoder 25 for expanding the compressed data output from the memory controller 23 on the time axis.

The audio decompression decoder 25 is an ATRAC (Adaptive TRansform Aco) which is also a feature of MD players.
the optical pickup 1 to 1.4M via the memory controller 23.
The compressed data transferred at the write rate of bit / s is stored in the memory 24, and the compressed data stored in the memory 24 is expanded to a read rate of 0.3 Mbit / s via the memory controller 23. The expanded audio data is supplied to the D / A converter 110.

The memory 24 is composed of, for example, a dynamic RAM which stores compressed data which is audio data from the memory controller 23.

The mechanical control unit 10 drives the spindle motor 11 for rotationally driving the disc 100 placed on the turntable, and the optical pickup 1 for the disc 1.
Feed motor 12 for moving in the track direction of 00,
It has a servo control circuit 13 for driving and controlling the spindle motor 11 and the feed motor 12. The servo control circuit 13 is responsive to a mechanical control signal from the CPU 9 for the optical pickup 1 and the feed motor 12.
And a rotation drive control signal to the spindle motor 11.

The memory controller 23 detects, from the compressed data from the EFM decoder 22, a data error caused by scratches on the disc 100, vibration continuously applied to the player, or the like, and the CPU 9 detects the error. The notification is made.

Inside the CPU 9, a progress counter 8 for counting the progress count value for each predetermined amount of the audio data read by the optical pickup 1, and the number of errors according to an error detection notification from the memory controller 23. , An error counter 6 that counts each time as an error count value, a retry counter 5 that counts the number of retries of the retry operation by the optical pickup 1 each time as a retry count value, and an allowable limit value of the error count value. And a set value memory section 7 for preset storing a retry set value indicating an allowable limit value of the retry count value.

Next, the operation of the MD player will be described. FIG. 2 is a flowchart showing the processing operation of the CPU 9 in the retry execution processing of the MD player. The retry execution process is started at the same time when the optical pickup 1 starts the operation of reading the audio data recorded on the disc.

In FIG. 2, the CPU 9 starts the progress counter 8 (step S11) and determines whether a data error has occurred via the memory controller 23 (step S12). If a data error has occurred, the error count value of the error counter 6 is incremented by +1 (step S13), and it is determined whether the error count value is equal to or greater than the error set value (step S14).

If the error count value is not greater than the error set value, it is determined whether the retry count value of the retry counter 5 is greater than or equal to the retry set value (step S15). If the retry count value is not greater than the retry setting value, the mechanical control unit 10 causes the optical pickup 1 to execute a retry operation for audio data related to an error (step S16), and the retry counter 5
Is incremented by 1 (step S17), and it is determined whether the progress count value of the progress counter 8 is "1" (step S18).
In step S18, the progress count value of the progress counter 8 is set to "1" instead of "0" because the data remaining in the memory 24 remains while the voice data immediately after the voice data related to the error is accessed. This is to prevent the sound from being cut off due to lack of volume.

If the progress count value is "1" in step S18, it is determined that the remaining amount of data in the memory 24 is small, and the sound immediately after the error is output to the optical pickup via the mechanical control unit 10. The data access operation is executed (step S19), and it is determined whether or not the reading process for the audio data recorded on the disc is completed (step S20). The determination as to whether or not the audio data reading process has been completed in step S20 is made, for example, by inputting a stop key on an operation unit (not shown) or by ending reproduction of the disc.

If the voice data reading process is completed in step S20, the retry execution process is completed. If the reading process is not completed in step S20, the process proceeds to step S12.

If no data error has occurred in step S12, the process proceeds to step S12 again while continuing the progress counter 8 started in step S11.

If the error count value of the error counter 6 is greater than or equal to the error setting value in step S14, it is determined whether the retry count value of the retry counter 5 is greater than or equal to the retry setting value (step S).
21). If the retry count value is greater than or equal to the retry setting value, the process proceeds to M1 in the figure.

If the retry count value is not equal to or greater than the retry setting value in step S21, the mechanical control unit 10 causes the optical pickup 1 to execute a retry operation for audio data related to an error (step S21). S22), the retry count value of the retry counter 5 is incremented by +2 (step S23), and the process proceeds to step S18.

If the retry count value of the retry counter 5 is greater than or equal to the retry set value in step S15, the process proceeds to step S19.

If the progress count value of the progress counter 8 is not "1" or less in step S18, the progress count value is decremented by 1 (step S24), and the process proceeds to step S12.

According to the above-described embodiment, the retry set value indicating the allowable limit of the retry count value is stored in advance, and when an error related to the voice data is detected, the optical pickup 1 converts the voice data related to the error into the voice data. Detects by comparing the retry count value and the retry setting value,
When the retry count value is greater than or equal to the retry setting value, the optical pickup 1 is made to read the audio data immediately after the audio data related to the error, so that the remaining amount of data in the memory 24 is lowered by the excessive retry operation. It is possible to prevent the interruption of sound due to excessive retry operation.

Further, in the above embodiment, the progress counter 5 is started at the same time when the reading by the optical pickup 1 is started, and the sound data read by the optical pickup 1 is counted by the progress counter 5 for each predetermined amount. Since the value of the retry count value is changed based on the count value, the retry operation is executed while taking into consideration the remaining amount of data stored in the memory 24. 24
It is possible to more reliably prevent the decrease in the remaining amount of data, and to further prevent the sound interruption due to the excessive retry operation.

In the above embodiment, it is ensured that the remaining amount of data in the memory 24 is reduced based on the progress count value obtained by counting the voice data read by the optical pickup 1 by the progress counter 5 for each predetermined amount. However, the remaining amount of data in the memory 24 is monitored via the memory controller 23, or the decrease in the remaining amount of data in the memory 24 is prevented based on the reading operation time of the optical pickup 1. May be.

Further, in the above embodiment, the reproduction-only MD player has been described, but it goes without saying that it is also applicable to a recording / reproduction MD player.

[0034]

According to the disk device of the present invention configured as described above, the retry set value indicating the allowable limit of the retry count value is stored in advance, and when an error relating to voice data is detected, an error occurs. When the retry count value of the reading means and the retry setting value for the voice data relating to the above are compared and detected, and the retry count value is equal to or more than the retry setting value, the reading means outputs the voice immediately after the voice data relating to the error. Since the data is read, it is possible to prevent a decrease in the remaining amount of data in the storage means due to an excessive retry operation, and to prevent sound interruption due to an excessive retry operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an MD player to which a disc device of the present invention is applied.

FIG. 2 is a flowchart showing the processing operation of the CPU in the retry execution processing of the MD player to which the disc device of the present invention is applied.

[Description of Reference Signs] 1 optical pickup (reading means) 5 retry counter (retry count means) 8 progress counter (control means) 9 CPU (control means) 23 memory controller (signal processing means) 24 memory (storage means)

Claims (4)

[Claims] 1. A reading means for sequentially reading audio data recorded on a disc, an error relating to the read audio data is detected, and the audio data is stored in a storage means.
A signal processing unit that reads out audio data from the storage unit at a read rate higher than the storage rate of the audio data and outputs the read audio data as audio, and an error relating to the audio data is detected by the signal processing unit. Then, a disk device having a control unit that causes the reading unit to execute a retry operation, and has a retry count unit that counts the number of retry operations executed at the time of error detection as a retry count value. Stores a retry set value indicating the allowable limit of the retry count value in advance, and when an error related to the voice data is detected, the retry count value and the retry set value are compared and detected, and the retry count is set. If the value is greater than or equal to the retry setting value, the reading unit reports the error. Disk apparatus characterized by to read the audio data immediately after Waru audio data. 2. The disk device according to claim 1, wherein the control unit changes the value of the retry count value based on the remaining amount of data stored in the storage unit. 3. The disk device according to claim 1, wherein the control unit changes the value of the retry count value based on a reading operation time of the audio data by the reading unit. 4. The control means counts the voice data read by the reading means for each predetermined amount, and changes the value of the retry count value based on the count value. The disk device described.