JPH097302A - Digital audio reproducer - Google Patents

Abstract

PURPOSE: To obtain a voice output in an audible range stably by changing the level of the voice output according to the intensity of vibration generated outside a reproducer. CONSTITUTION: After reproduction information read from an optical disc 1 is stored into a memory 8, a reproduction digital audio signal is outputted. A vibration detecting circuit 13 detects vibration generated outside a reproducer and generates a signal quantized according to the intensity of the vibration. A signal is added to the reproduction digital audio signal amplified through a voice amplifying circuit 12 by a vibration detection information addition circuit 14. This enables heightening of the output level of a digital audio signal corresponding to the intensity of the vibration detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio reproducing apparatus capable of changing a reproduction volume when vibration is detected.

[0002]

2. Description of the Related Art In recent years, outdoor use of digital audio devices capable of recording and reproducing has become widespread. In such a digital audio device, a band of information such as conversation information and music information is compressed and recorded on a recording medium such as an optical disk, and at the time of reproduction, the information compressed at the time of recording read from a head channel such as a pickup is temporarily stored in a memory. After writing and decompressing, a digital audio reproducing device that performs a predetermined process such as A / D conversion is made to sound externally.

As such a digital audio reproducing apparatus, there is conventionally one as shown in FIG. FIG. 2 is a block diagram showing a configuration of a conventional digital audio reproducing apparatus, in which 1 is an optical disk on which voice or audio information is recorded, 2 is a spindle motor for rotating the optical disk 1, 3 is a light source and a track on the optical disk. Optical disk 1 and an objective lens actuator that drives the objective lens that focuses the light beam on
A pickup including a photoelectric conversion element that converts a light beam reflected from the optical signal into an electric signal, 4 is a pickup drive motor, and 5 is a reproduced audio information (also simply referred to as reproduction information) by binarizing the read signal by waveform shaping. Is an RF circuit for outputting a focus error signal and a tracking error signal from the read signal.

Reference numeral 7 denotes edge detection for reproduction information from the RF circuit 5, detection of a CLV (constant linear velocity) control signal,
EFM (eight to four modulation (8 bits = 1
4 bit modulation)) EFM demodulation and error correction circuit for performing signal processing such as demodulation and error correction, 6 is a servo control circuit for controlling the spindle motor 2 and the pickup drive motor 4, 10 is a CPU for controlling the entire device, Reference numeral 11 is a panel display section and panel key input section including a panel display section for displaying reproduction information and a panel key input section for operating or operating the apparatus, and 8 is a reproduction / index information storage memory for storing reproduction information and table of contents information and the like. , 9 are memory control circuits, 1
Reference numeral 2 is a voice decompression circuit that decompresses the read band-compressed reproduction information and outputs a reproduction digital audio signal, 15 is a D / A conversion circuit that converts the reproduction digital audio signal into an analog audio signal, and 16 is a speaker Is.

Next, the operation of the conventional digital audio reproducing apparatus will be described with reference to FIG. First, the read signal read from the optical disc 1 via the pickup 3 is amplified in the RF circuit 5, binarized by waveform shaping, and output to the EFM demodulation and error correction circuit 7 as reproduction information. On the other hand, the RF circuit 5
Processes the read signal and outputs a focus error signal and a tracking error signal to the servo control circuit 6.
The binarized reproduction information is subjected to edge detection, CLV control signal detection, and EF in the EFM demodulation and error correction circuit 7.
Signal processing such as M demodulation and error correction is performed.

The reproduction information output from the EFM demodulation and error correction circuit 7 is stored in the reproduction / index information storage memory 8 under the control of the memory control circuit 9. The reproduction information written in the reproduction / table of contents information storage memory 8 is
The data is sequentially read out under the control of the CPU 10 and the memory control circuit 9, expanded in the audio expansion circuit 12, restored to the original length, converted into an analog signal in the D / A conversion circuit 15, and converted from the speaker 16 into voice or music. Is output as.

As described above, the reproduction information read from the recording medium (optical disk) 1 is once written in the reproduction / index information storage memory 8 and is stored therein in a considerable amount. Then, even when a situation in which continuous reading of information from the pickup 3 fails, information is sequentially output from the reproduction / index information storage memory 8 to the D / A conversion circuit 15, and reproduction is performed. The information can be continuously output if the information can be read again from the pickup 3 before the index information storage memory 8 is out of information.

[0008]

However, in the above-mentioned conventional digital audio reproducing apparatus, the information is continuously output even when the situation in which the continuous reading of the information from the pickup is hindered occurs. Although it is possible, due to external noise generated by vibration, audio playback output (playback audio output)
There was a situation where it was difficult to hear.

The present invention has been made in view of the above problems, and by changing the audio output level according to the intensity of the vibration generated outside the digital audio reproducing apparatus, the sound output by the noise generated by the vibration is generated. The purpose is to provide a stable audio output in the audible range without being erased.

[0010]

In order to achieve the above object, a digital audio reproducing apparatus according to the present invention is a CPU which controls the digital audio reproducing apparatus as a whole.
An RF circuit for processing information read from the recording medium in the head section to extract reproduction information; an EFM demodulation and error correction circuit for performing signal processing such as EFM demodulation and error correction on the reproduction information; and EFM demodulation and A reproduction / content information storage memory for storing reproduction information from the error correction circuit and the table of contents information of the disc, and a memory control circuit for writing and reading the reproduction information to / from the reproduction / content information storage memory under the control of the CPU, A sound expansion circuit for expanding the band-compressed reproduction information read from the reproduction / table of contents information storage memory and outputting a reproduction digital audio signal is further detected, and further vibration generated outside the digital audio reproduction device is detected. Then, a vibration detection circuit that generates a quantized electric signal corresponding to the intensity of the vibration, and a quantized electric signal A vibration detection information addition circuit for adding the digital audio signal and a D / A conversion circuit for converting the reproduced digital audio signal whose output level has been changed by the addition to the analog audio signal are provided, which are adapted to the detected external vibration. It is characterized in that the reproduced audio output is changed.

Further, in order to achieve the above object, the digital audio reproducing apparatus according to the present invention has a vibration detecting element for detecting the vibration generated outside by the vibration detecting circuit and generating an output according to the intensity of the vibration. The output is amplified, quantized, and converted into an electric signal.

[0012]

The digital audio reproducing apparatus according to the present invention is configured as described above, so that the reproduction information read from the optical disk is temporarily stored in the storage memory and then the reproduced digital audio signal is output. Vibration generated outside the digital audio playback device is detected, and an electric signal quantized according to the strength of the vibration is generated, and in the vibration detection information adding circuit, the electric signal is expanded into a reproduced digital audio signal through the audio expansion circuit. In addition, by increasing the output level of the digital audio signal according to the strength of the detected vibration, the audio output signal will not be interrupted by the vibration generated outside, and the audio generated by the vibration The output is canceled and you listen Without becoming difficult Ri, it is possible to easily listen to the always audio output even if the noise becomes high.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings and FIG. FIG. 1 is a block diagram showing the configuration of a digital audio reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is an optical disc for recording information such as music, 2 is a spindle motor for rotating the optical disc 1 under the control of a servo control circuit 6,
Reference numeral 3 denotes a light source (not shown) that generates a light beam, an objective lens that converges the light beam emitted from the light source and focuses it on the track of the optical disc, and a focus servo and tracking to control the attitude of the objective lens. It is a pickup including an objective lens actuator that performs servo, and a photoelectric conversion element (not shown) that receives a light beam reflected from an optical disk and converts the light beam into an electric signal.

A pickup drive motor 4 constitutes a traverse mechanism as a conveying means for moving the pickup 3 in the radial direction of the optical disk 1 together with a position detector (not shown) and other mechanical parts. The optical disc 1, the spindle motor 2, the pickup 3, and the pickup driving motor 4 constitute a head portion of the digital audio reproducing apparatus.

Further, numeral 5 amplifies a read signal read from the optical disk 1 through the pickup 3 and binarizes it by waveform shaping to extract reproduced audio information (hereinafter, also referred to as reproduced information or reproduced data) and outputs it. An RF circuit for outputting a focus error signal and a tracking error signal from a read signal, 10 is a CPU for controlling the entire digital audio reproducing apparatus, and 6 is a CPU 1.
A servo control circuit for controlling the spindle motor 2 and the pickup drive motor 4 under the control of 0, 7 is an RF circuit 5
It is an EFM demodulation and error correction circuit that performs various signal processing such as EFM demodulation including error detection and CLV control signal detection and error correction on the reproduction information input from.

Further, 8 is a reproduction / index information storage memory for storing reproduction information and disc index information, and 9 is a CP.
Under the control of U10, a memory control circuit for writing / reading reproduction information to / from the reproduction / table of contents information storage memory 11, 11 controls a panel display section for displaying reproduction information and operation of a digital audio reproducing apparatus such as reproduction of information. A panel display unit and a panel key input unit including a panel input unit to be operated and decompresses the band-compressed reproduction information read from the reproduction / table of contents information storage memory 8 and restores it to output a digital audio signal. This is a voice expansion circuit.

Further, 13 has a vibration detecting element for detecting a vibration generated outside the digital audio reproducing apparatus and generating an output corresponding to the strength of the vibration, and amplifying and quantizing the output to obtain the strength of the external vibration. A vibration detection circuit for outputting an electric signal of an output level according to the reference numeral 14 is a vibration detection circuit 13
A vibration detection information addition circuit for adding the quantized electric signal from the audio expansion circuit 12 to the digital audio signal from the voice expansion circuit 12 to raise the output level of the digital audio signal according to the strength of the external vibration. 1
A D / A conversion circuit for converting the reproduced digital audio signal added in 4 into an analog audio signal, and 16 is a speaker.

In the configuration of the above digital audio reproducing apparatus, an EFM demodulation and error correction circuit 7 for performing various signal processing such as EFM demodulation and error correction, and a reproduction / content information storage memory for storing reproduction information and table contents information of the disc. 8 and a memory control circuit 9 for writing and reading reproduction information to / from the reproduction / table of contents information storage memory 8,
A signal processing circuit is formed by the audio expansion circuit 12 which expands the band-compressed reproduction information read from the reproduction / table of contents information storage memory 8 and outputs a decompressed digital audio signal.

Next, with reference to FIG. 1 as well, the operation of the digital audio reproducing apparatus according to the present embodiment configured as described above will be described. First, the panel display section and the panel input section 11 for controlling the operation of the digital audio reproducing apparatus are operated to start the information reproducing operation in the digital audio reproducing apparatus. The read signal read from the optical disc 1 through the pickup 3 by the information reading operation from the optical disc 1 is amplified in the RF circuit 5 and binarized by waveform shaping, and is reproduced by the EFM demodulation and error correction circuit 7 as reproduction information. Is output.

On the other hand, the RF circuit 5 processes the read signal and outputs a focus error signal and a tracking error signal to the servo control circuit 6. The servo control circuit 6 controls the drive of the spindle motor 2 and the pickup drive motor 4 under the control of the CPU based on the focus error signal and the tracking error signal. The reproduction information binarized in the RF circuit 5 is subjected to signal processing such as edge detection, CLV control signal detection, EFM demodulation and error correction in the EFM demodulation and error correction circuit 7. The reproduction information processed by the EFM demodulation and error correction circuit 7 is stored in the reproduction / index information storage memory 8 under the control of the memory control circuit 9. The reproduction information written in the reproduction / index information storage memory 8 is sequentially read out under the control of the CPU 10 and the memory control circuit 9 and expanded by the audio expansion circuit 12 to become a digital audio signal.

Now, suppose that the vibration detecting element in the vibration detecting circuit 13 detects a vibration generated outside the digital audio reproducing apparatus, a detection value corresponding to the strength of the vibration is generated. The detected value is amplified in the vibration detection circuit 13, converted into a quantized electric signal, and output to the vibration detection information addition circuit 14 as a vibration detection signal. The vibration detection information addition circuit 14 adds the vibration detection signal and the digital audio signal from the voice expansion circuit 12 and outputs the result to the D / A conversion circuit 15. The D / A conversion circuit 15 converts the digital audio signal into an analog audio signal (voice signal), and the speaker 16
Is output as voice or music. Also, play
The reproduction information read from the table of contents information storage memory 8 is C
Panel display unit and panel key input unit 1 via PU10
Displayed as 1.

The parameter added in the vibration detection information adding circuit 14 is the output level of the digital audio signal, and if the detected vibration intensity is high, the digital audio signal is added so that the audio output level also rises accordingly. After the actual vibration detection, the time required for the vibration detection circuit 13 to output the vibration detection signal is very short, and there is almost no delay of about several hundred microseconds. Therefore, the inconvenient phenomenon that the vibration is felt and the audio output becomes large after the vibration disappears and reaches the ear of the listener does not occur.

[0023]

The digital audio reproducing apparatus according to the present invention is configured as described above, and particularly, the reproduction information read from the optical disk is temporarily stored in the storage memory and then the reproduced digital audio signal is output.
The vibration detection circuit detects a vibration generated outside the digital audio playback device, generates a quantized electric signal according to the strength of the vibration, and a vibration detection information addition circuit reproduces the electric signal expanded through a voice expansion circuit. By adding the signal to the digital audio signal to increase the output level of the digital audio signal in response to the detected vibration intensity, the vibration generated outside will not interrupt the audio output signal and It is possible to make the audio output always easy to hear even if the noise is high, without the audio output being canceled by the noise caused by the noise and becoming difficult to hear.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a digital audio reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional digital audio reproducing device.

[Explanation of symbols]

 1 Optical Disc 2 Spindle Motor 3 Pickup 4 Pickup Drive Motor 5 RF Circuit 6 Servo Control Circuit 7 EFM Demodulation and Error Correction Circuit 8 Playback / Table of Contents Information Storage Memory 9 Memory Control Circuit 10 CPU 11 Panel Display and Panel Key Input 12 Audio Expansion Circuit 13 Vibration detection circuit 14 Vibration detection information addition circuit 15 D / A conversion circuit 16 Speaker

Claims (2)

[Claims] 1. A CPU for controlling a digital audio reproducing apparatus as a whole, and an RF circuit for processing information read from a recording medium in a head section to extract reproduction information.
An EFM demodulation and error correction circuit that performs signal processing such as EFM demodulation and error correction on the reproduction information; , Said C
A memory control circuit for writing / reading reproduction information to / from the reproduction / content information storage memory under the control of the PU, and expanding the band-compressed reproduction information read from the reproduction / content information storage memory. A sound decompression circuit for outputting a reproduced digital audio signal; and a vibration detection circuit for detecting a vibration generated outside the digital audio reproduction device and generating a quantized electric signal corresponding to the strength of the vibration. A vibration detection information adding circuit for adding the quantized electric signal and the reproduced digital audio signal, and a D / A conversion circuit for converting the reproduced digital audio signal whose output level is changed by the addition into an analog audio signal. , The playback audio output is changed according to the detected external vibration. Digital audio reproducing apparatus according to. 2. The vibration detecting circuit comprises a vibration detecting element for detecting the generated vibration and generating an output according to the intensity of the vibration, and amplifying the output, quantizing the output, and converting the output into an electric signal. The digital audio reproducing apparatus according to claim 1, wherein