JPH09251719A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a temporal margin for reproduction and to evade effectively sound jump and degradation of sound quality by making memory capacity for reproduced data large and always monitoring it. SOLUTION: An amplifier circuit 4 amplifies reproduced signal RF from a mechanical deck section 3, a tracking error signal TE, a focus error signal FE. A servo/signal processing circuit 5 outputs a tracking signal and a focus signal so that signal levels of these signals TE, FE are made 0, while detects detrack, defocus, and track jump, and informs it to a system control circuit 7. A memory control circuit 8 always monitors empty capacity of a memory 9, and writes and reads audio data. When the system control circuit 7 indicates stop of writing, writing is stopped. Thereby, overflow of the memory 9 is evaded. Then, the memory 9 is constituted with dynamic random access memories of large capacity, temporal margin for reproduction is made, and degradation of sound quality is evaded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device, and is applied to a compact disc player or the like formed so that skipping of sound can be effectively avoided by outputting audio data through a large capacity memory. In this compact disc player or the like, the operation of writing the audio data to the memory is stopped and controlled, and the audio data accumulated in the memory is repeatedly output so that the repeat reproduction can be easily performed.

[0002]

2. Description of the Related Art Heretofore, some compact disk players of this type have been made portable and usable. In such a portable compact disc player, sound skipping is effectively avoided by outputting an audio signal via a large-capacity memory.

That is, this compact disc player reproduces audio data from a compact disc at a reproduction speed four times higher than the standard speed, and sequentially stores this audio data in a memory. Further, in this compact disc player, audio data is read from this memory at a data transfer rate corresponding to a standard reproduction rate, and digital signal processing such as error correction processing and deinterleave processing is performed and output. By doing so, even if the temporary reproduction operation is stopped until the audio data stored in the large-capacity memory is output, the sound interruption can be effectively avoided. It is possible to form a time margin in the reproduction of.

Utilizing this time margin effectively, the compact disc player repeatedly reproduces the same portion when detrack, defocus, track jump, etc. occur. When a bit error that is difficult to correct is generated in the reproduced audio data, the same portion is repeatedly reproduced in the same manner, thereby effectively avoiding the sound quality deterioration of the audio signal. As a result, in a portable compact disc player, even if a disturbance such as vibration occurs due to carrying, skipping can be effectively avoided, and further deterioration of sound quality can be effectively avoided.

[0005]

By the way, as an audio device to be carried and used in this way, there is a tape recorder. Some of such portable tape recorders have a repeat reproducing function of repeatedly reproducing the same portion, and are used for learning English conversation, for example, while commuting to work.

Even in a compact disc player, if this type of repeat reproduction function can be added, the usability can be further improved. In this case, it is conceivable that this kind of function can be easily added by fully incorporating the repeat reproduction configuration applied to the tape recorder.

That is, in this type of tape recorder, an audio signal reproduced from a magnetic tape is subjected to analog-to-digital conversion processing to be converted into a digital audio signal, and then the digital audio signal is data-compressed and sequentially recorded in a memory. When the user further operates the repeat operator, digital audio signals are sequentially and cyclically read out from this memory, converted into the original audio signals and output.

However, when the repeat reproducing function is added in this way, there is a problem in that the entire structure of the compact disc player becomes complicated.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a disk device capable of repeat reproduction with a simple structure.

[0010]

In order to solve such a problem, in the present invention, the audio data write operation in the memory control means is stopped and controlled in response to the operation of the operation element, and the power supply from the power supply to the reproduction means is controlled. The supply of is controlled to stop.

When the write operation of the audio data in the memory control means is controlled to stop, the audio data held in the memory is repeatedly read and output, and repeat reproduction can be performed. At this time, the power supply from the power source to the reproducing means can be controlled to be stopped to reduce the power consumption.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a compact disc player according to an embodiment of the present invention. This compact disc player 1 is designed to be capable of playing a compact disc 2 while being carried.

That is, the compact disc player 1
In the mechanical deck unit 3, the compact disc 2 is irradiated with a laser beam from the optical pickup in a state where the compact disc 2 is rotationally driven by a spindle motor at a predetermined rotational speed. Further, the mechanical deck unit 3 receives the return light of the laser beam with an optical pickup, and a tracking error in which the reproduction signal RF whose signal level changes according to the change in the amount of the return light and the signal level changes according to the detrack amount. A focus error signal FE whose signal level changes according to the signal TE and the defocus amount is generated.

The amplifier circuit 4 amplifies and outputs the reproduction signal RF, the tracking error signal TE and the focus error signal FE.

The servo / signal processing circuit 5 reproduces the reproduction signal RF.
Is binarized to generate a binarized signal, and a reproduction clock is generated from the binarized signal. The servo / signal processing circuit 5
The drive circuit 6 is arranged so that this reproduction clock has a predetermined frequency.
The spindle control signal is output to. Further, the servo / signal processing circuit 5 outputs a tracking control signal and a focus control signal to the drive circuit 6 so that the signal levels of the tracking error signal TE and the focus error signal FE become 0 level, respectively. Servo / signal processing circuit 5
Is controlled by the system control circuit 7 to output a seek control signal to the drive circuit 6. In this series of processes, the servo / signal processing circuit 5 detects detrack, defocus, and track jump by monitoring the signal levels of the tracking error signal TE and the focus error signal FE, and the detection result is system controlled. Notify the circuit 7.

Further, the servo / signal processing circuit 5 converts the reproduction signal RF into serial data by sequentially latching the binarized signal on the basis of the reproduction clock. The servo / signal processing circuit 5 converts this serial data into parallel data with reference to the sync data added to this serial data. Further, the servo / signal processing circuit 5 demodulates this parallel data, performs error correction processing, and then deinterleaves it, thereby reproducing and outputting the audio data recorded on the compact disc 2. In this error correction processing, the servo / signal processing circuit 5 notifies the system control circuit 7 of a bit error that is difficult to correct in the audio data.

The drive circuit 6 drives the spindle motor of the mechanical deck unit 3 in response to the spindle control signal, so that in this compact disc player 1, the mechanical deck unit 3, the amplifier circuit 4, the servo / signal processing circuit 5, the drive circuit. A spindle servo system is constituted by 6, and the compact disc 2 is rotationally driven at a rotational speed four times the standard rotational speed.

Further, the drive circuit 6 drives the optical pickup of the mechanical deck section 3 in response to the tracking control signal and the focus control signal, whereby the tracking servo is performed together with the mechanical deck section 3, the amplifier circuit 4, the servo / signal processing circuit 5. System and a focus servo system to perform tracking control and focus control. Similarly, the optical pickup of the mechanical deck unit 3 is moved in the radial direction of the compact disc 2 in response to the seek control signal, and the optical pickup is caused to seek.

Thus, in the compact disc player 1, the mechanical deck unit 3, the amplifier circuit 4, the servo / signal processing circuit 5, and the drive circuit 6 are used to reproduce the audio data recorded on the compact disc, which is a disc-shaped recording medium. It is designed to make up.

The memory control circuit 8 controls the operation of the memory 9 to sequentially and cyclically write the audio data output from the servo / signal processing circuit 5 into the memory 9 and read the audio data stored in the memory 9. Output. That is, the memory control circuit 8 has an address counter, and the write address and the read address of the memory 9 are issued from this address counter. At this time, the memory control circuit 8 reads the audio data from the memory 9 and outputs the audio data at a data transfer rate of 1/4 as compared with the time of writing. Further, the memory control circuit 8 monitors the free space of the memory 9 via the write address and the read address, and when the free space becomes equal to or less than a predetermined value, it notifies the system control circuit 7.

When the system control circuit 7 gives an instruction to stop writing in response to this notification, the memory control circuit 8
The writing of the audio data to the memory 9 is stopped, whereby the overflow of the memory 9 is effectively avoided.

The memory 9 is composed of a large-capacity dynamic random access memory, so that in the compact disc player 1, audio data is reproduced through the large-capacity memory so that the compact disc 2 can be reproduced with time. Is formed so that skipping of sound and deterioration of sound quality of audio data can be effectively avoided.

In addition to the processing in such a general compact disc player, the memory control circuit 8 is formed so that the system control circuit 7 can set the repeat reproduction mode. In this repeat reproduction mode, the memory 9 overflows. The writing of audio data to the memory 9 is stopped as in the case of the prevention processing. As a result, when the memory control circuit 8 is set to this repeat reproduction mode, the memory control circuit 8 repeatedly reads and outputs the audio data held in the memory 9.

Digital-analog conversion circuit (D / A) 1
0 performs digital-analog conversion processing on the audio data output from the memory control circuit 8 and outputs a 2-channel audio signal which is an analog signal. The amplifier circuit 11 amplifies this audio signal and outputs it from the speaker 12 which is an earphone. At this time, the amplifier circuit 11 amplifies the audio signal according to the frequency characteristic set by the acoustic correction circuit 13 and imparts various effects such as emphasizing the bass to the reproduced audio signal and outputs the audio signal.

Therefore, the acoustic correction circuit 13 switches and controls the frequency characteristic of the amplifier circuit 11 according to the control data output from the system control circuit 7.

The power supply circuit 14 is composed of a DC-DC converter, and supplies a power supply obtained from a rechargeable battery.
The power supplies are converted into driving power supplies of various voltages necessary for the operation of the compact disc player 1, and the respective power supplies are output to the corresponding circuits. At this time, the mechanical deck section 3, the amplifier circuit 4, the servo / signal processing circuit 5, and the drive circuit 6 which constitute the reproducing means.
Power is supplied via a switch circuit 15, which is on / off controlled by the system control circuit 7. As a result, the power supply circuit 14 can stop the supply of power to the reproduction system as needed.

The system control circuit 7 is formed by a microcomputer that controls the operation of the entire compact disc player 1. That is, the system control circuit 7
When the power is turned on with the compact disc 2 loaded, the whole operation is set to the reproduction mode, whereby the compact disc player 1 responds to the subsequent operation of the operating element 16 and the like. The audio data recorded in (1) is reproduced and output from the speaker 12.

In reproducing the audio data, the servo / signal processing circuit 5 detracks, defocuses,
When there is a notification of a track jump or a bit error for which error correction is difficult, the system control circuit 7 issues a seek command to the servo / signal processing circuit 5 to repeatedly reproduce the locations where these accidents have occurred. As a result, in the compact disc player 1, a portion that could not be correctly reproduced due to disturbance or the like while being carried while being carried is repeatedly reproduced by utilizing the time margin formed by the memory 9 to skip audio data. Effectively avoid sound quality deterioration.

Further, when the system control circuit 7 is notified by the memory control circuit 8 that the free space of the memory 9 has decreased,
The writing of audio data in the memory control circuit 8 is temporarily stopped, and at the same time, the reproduction of audio data in the reproducing system is temporarily stopped to prevent overflow of the memory 9.

During reproduction of this audio data, the system control circuit 7 executes the processing procedure shown in FIG. 2, whereby the user operates the operating element 16 to select the operation mode of repeat reproduction. Instead of the audio data sequentially reproduced from the compact disc 2, the audio data held in the memory 9 is repeatedly output.

That is, the system control circuit 7 proceeds from step SP1 to step SP2, determines whether or not the repeat key has been pressed, and if a negative result is obtained here, step SP2 is repeated. On the other hand, when the user presses the repeat operator, this step S
When a positive result is obtained in P2, the system control circuit 7 moves to step SP3.

The system control circuit 7 executes this step SP
In 3, the switch circuit 15 is set to the off state, whereby the supply of power to the reproduction system unnecessary for this repeat reproduction is stopped and controlled. As a result, the system control circuit 7
Is designed to reduce power consumption in the repeat reproduction mode. Actually, the power supply is controlled to be stopped in this way, and the power consumption is reduced to about 1 as compared with the normal reproduction.
Could be reduced to / 4.

Subsequently, the system control circuit 7 proceeds to step S
Moving to P4, a control signal is output to the memory control circuit 8 to set the memory control circuit 8 in the repeat reproduction mode. As a result, the system control circuit 7 proceeds to step SP5 to complete the setting of the repeat reproduction mode, and then proceeds to step SP6 to end this processing procedure.

As a result, in the compact disc player 1 as shown in FIG. 3, the configuration of the compact disc player 1 is effectively used to repeatedly output the audio data stored in the memory 9.
For that reason, the repeat reproduction can be performed with a simple structure as a whole. Actually, when adding the repeat function to the compact disc player in this way,
The repeat reproduction function can be easily added by changing the processing program of the system control circuit, adding the switch circuit 15, and the like, and thus the repeat reproduction can be performed with a simple configuration as a whole.

As a result, the compact disc player 1 can be repeatedly listened to, for example, English sentences, karaoke rust, etc., to improve the usability. If necessary, in the repeat reproduction, the operation of the sound correction circuit 13 can be switched to make a listening comparison.

In the above configuration, the reproduction signal RF obtained from the compact disc 2 is amplified by the amplifier circuit 4 and then input to the servo / signal processing circuit 5, where the audio data is reproduced. This audio data is
Are sequentially written in the memory 9 via the memory control circuit 8,
Further, it is read from the memory 9, converted into an audio signal by the digital-analog conversion circuit 10, and output from the speaker 12 via the amplifier circuit 11.

In this stream of audio data, the compact disc 2 is rotationally driven at a high speed, so that in the reproducing system, the audio data is reproduced at a data transfer rate four times as high as the standard, and this audio data is reproduced. It is written in the memory 9. On the other hand, the audio data is read from the memory 9 at a standard data transfer rate, whereby a time margin is formed in the reproduction of the audio data in the memory 9, and this time margin is used. In a track jump or the like, audio data is repeatedly reproduced, and skipping of audio data and sound quality deterioration are effectively avoided.

When the user presses the repeat operator 16 while the audio data is being reproduced in this way, the system control circuit 7 causes the switch circuit 15 to operate.
Is switched off. As a result, the supply of power to the reproduction system is controlled to be stopped, and the power consumption is reduced.
Further, the system control circuit 7 sets the operation mode of the memory control circuit 8 to the repeat reproduction mode, and the write operation to the memory 9 is stopped and controlled. As a result, the audio data held in the memory 9 is repeatedly read from the memory 9 and output from the speaker 12 for repeat reproduction.

According to the above configuration, by stopping the operation of writing the audio data into the memory 9,
The audio data held in the memory 9 can be repeatedly output, which allows repeat reproduction with a simple configuration. At this time, the power consumption can be reduced by controlling the stop of the power supply to the reproduction system at the same time.

In the above embodiment, the case where the present invention is applied to the compact disc player has been described, but the present invention is not limited to this, and audio data is transmitted via a large capacity memory such as a mini disc device. It can be widely applied to a reproducing disk device.

[0042]

As described above, according to the present invention, in a disk device which outputs audio data via a large capacity memory, the operation of writing the audio data to the large capacity memory is controlled to stop, and at the same time, By controlling the supply of power to the reproducing means, it is possible to add a repeat reproducing function to a disk device such as a compact disk player with a simple structure.

[Brief description of drawings]

FIG. 1 is a block diagram showing a compact disc player according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure in the system control circuit of FIG.

3 is a block diagram showing a flow of audio data in a repeat reproduction mode in the compact disc player of FIG.

[Explanation of symbols]

1 ... Compact disc player, 2 ... Compact disc, 3 ... Mechanical deck section, 4,11 ... Amplification circuit, 5 ... Servo / signal processing circuit, 6 ... Drive circuit, 7
...... System control circuit, 8 ...... Memory control circuit, 9 ......
memory

Claims (1)

[Claims] 1. A reproducing unit for reproducing audio data recorded on a disk-shaped recording medium, a memory for temporarily holding the audio data, audio data output from the reproducing unit, and the memory. Memory control means for reading and outputting the audio data written to the memory, power source for supplying power to the reproduction means, the memory, the memory control means, and control means for controlling the overall operation, wherein the control means A disk device, characterized in that, in response to an operation of an operator, the audio data writing operation in the memory control means is stopped and the supply of power from the power supply to the reproducing means is stopped.