JPH076508A - Information recording and reproducing system - Google Patents

Abstract

PURPOSE:To use a shockproof memory for recording a memorandom at the time of a sound recording mode by specifying which is written/read in a magneto-optical disk or the shockproof memory through a key input. CONSTITUTION:When the write destination or the read origin is specified to the magneto-optical disk 17 by a specifying key 19a of a key input part 19 by normal operation, a sound input is written on the magneto-optical disk 17 under recording operation, and under reproducing operation, the recorded signal of the disk 17 is read out and is stored in turn in a semiconductor memory 3 via a memory control part 4, and shockproof control is performed. On the other hand, when the write destination or the read origin is specified to the memory 3, the sound input is compressed by a sound compression encoder/ decoder part 2, and is stored in the memory 3 via the control part 4, and the compressed signal can be reproduced. The memory 3 is capable of storing information, normally, for a few seconds. Consequently, recording a memorandom for about a few seconds can be performed by the memory 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing system, for example, an information recording / reproducing system such as a mini disk (MD) capable of recording / reproducing using a writable / readable magneto-optical disc. It is a thing.

[0002]

2. Description of the Related Art In recent years, a mini disk (MD) device has appeared as a recording / reproducing device in the field of audio devices.
Unlike conventional CD (Compact Disc) devices for playback only, recording / playback with digital information is possible using a magneto-optical disc, and new audio compression technology ATRAC (Adaptive Transform Acoustic C).
oding) has made it possible to highly compress information.

An information recording / reproducing system of the above mini disk device will be described below. When recording audio on a magneto-optical disk: First, the audio analog signal is A /
D exchange is performed to obtain a digital signal, and the signal is encoded by the method of ATRAC which is a voice compression technology. Next, the encoded digital signal is converted into an EFM (Eight to Fou).
A frame for error code correction is added to the format of rteen modulation) and modulation is performed. After such EFM modulation, writing is performed on the magneto-optical disk via the recording head.

When reproducing sound from a magneto-optical disk, it is as follows. First, an EFM-modulated digital signal is read from the magneto-optical disk via a pickup head formed of an optical lens, an error code is corrected and demodulated. Next, in order to prevent the pickup head from tracking jumps due to vibrations and the like, so that the voice is not interrupted, the compressed voice data is decompressed via the shock pluke control means that has a memory that always records the voice compressed data for the latest several seconds. D / A conversion is performed and a voice analog signal is output.

[0005]

By the way, the above-mentioned mini disk device realizes compact portability, and further, in order to improve portability, that is, its seismic resistance, several M bits for performing shock proof control. A semiconductor memory of a certain degree is held, the information read from the disk is temporarily stored in this memory, and the information is read out and reproduced with a delay of several seconds.
That is, even if the tracking of the disk is lost due to a temporary external vibration, the reproduced sound is not affected because the previously compressed information of several M bits is stored in the memory. However, the memory is used only when reproducing or recording information, and is not used for any other purpose. The present invention has been made in view of the above circumstances, and an object thereof is to provide an information recording / reproducing system in which a memory for performing shock proof control can be used as a storage medium for another purpose.

[0006]

As means for solving the above problems, the present invention provides a voice compression means for A / D converting a voice signal and compressing the digital signal, and voice data by the voice compression means. Recording means for EFM-modulating and writing to a recording medium, and data of the recording medium written by the recording means is read by a pickup head E
A reproducing means for FM demodulation, a memory controlling means for controlling a memory for supplementing a missing portion in the case where the pickup head makes a trunking jump, and a compressed voice of the reproducing means via the memory controlling means for restoring D / A. In an information recording / reproducing system including at least audio restoring means for converting, key input means for designating writing / reading on the recording medium or writing / reading on the memory,
Recording destination switching means for switching the recording destination between writing the compressed data by the audio compressing means to the recording medium and writing to the memory; and reading from the recording medium and reading from the memory. In either case, the recording source switching means can switch the recording source, and the recording destination is controlled by the recording destination switching means in the audio signal input mode according to the designation by the key input means, and the recording source is controlled by the recording source switching means in the audio signal output mode. It is characterized by comprising a control means for controlling.

[0007]

When writing / reading to / from the recording medium is selected by the key input means, in the audio signal input mode, the EFM-modulated data of the audio-compressed digital signal by ATRAC is written in the magneto-optical disk recording medium. In the audio signal output mode, the data is read from the magneto-optical disk recording medium, EFM demodulated, and shock-proof control is performed to restore compressed data via the semiconductor memory and output the audio.

On the other hand, when the writing / reading to / from the memory is selected by the key input means, in the audio signal input mode, the audio is A / D exchanged and written as compressed digital audio data in the semiconductor memory. In the audio signal output mode, the audio compressed data in the semiconductor memory is read and restored,
D / A conversion and audio output. That is, it is possible to record a voice of several seconds in a memo.

[0009]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an information recording / reproducing system according to an embodiment of the present invention. Here, 1 is an A / D converter, 2
Is a voice compression encoder / decoder unit, 3 is a semiconductor memory, 4 is a memory control unit for controlling the semiconductor memory 3, 5 is a D / A conversion unit, 6 is a system control unit, 7 is an EFM encoder / decoder unit. Decoder part, 8 is a recording head drive part, and 10 is RF
Amplifier / address decoder section, 11 is servo control section, 1
2 is an optical pickup section, 14 is a spindle motor section, 1
Reference numeral 5 is a recording head, 16 is a reproducing head, 17 is a magneto-optical disk, 18 is a display section, and 19 is a designation for designating whether writing / reading is performed on the magneto-optical disk 17 or writing / reading on the semiconductor memory 3. A key input unit having a key 19a.

In this embodiment, the operation of the information recording / reproducing system will be described only by describing the characteristic portion of the present invention. First, writing or reading is designated by the designation key 19a of the key input unit 19. Here, when the writing destination or the reading source is designated to the magneto-optical disk 17, it is the same as the conventional information recording / reproducing system, and therefore it will be briefly described below. That is, in the recording operation, the data is converted by the A / D converter 1, compressed by the audio compression encoder / decoder 2, audio-compressed by the EFM encoder / decoder 7, and written on the magneto-optical disk 17. During the playback operation, the optical pickup unit 1
2, the EFM encoder / decoder unit 7 performs EFM demodulation, and the output data is sequentially stored in the semiconductor memory 3 by the memory control unit 4. After delaying for several M bits, the audio compression encoder / decoder unit 2 outputs the audio sequentially and outputs the audio via the D / A converter 5. If the reproducing head 16 has a tracking jump or the like, the system control unit 6 detects this and instructs the memory control unit 4 to perform shock proof control.

On the other hand, when the writing destination or the reading source is designated in the semiconductor memory 3 by the designation key 19a of the key input unit 19, the following is done. Voice recording is started by the recording start key to the key input unit 19. After the operation of the device is started, an audio signal from the outside is input to the A / D converter 1 and
The converter 1 converts an analog signal into a digital signal. The amount of information of this digital signal is compressed to about 1/5 in the next voice compression encoder / decoder unit 2. This information compression technique is performed by the ATRAC method.

The compressed digital signal is controlled by the following memory control unit 4 and stored in the memory 3 having a 1 Mbit capacity. The amount of information (speed) is about 0.3 Mbit /
Since it is about a second, information of several seconds can be stored in the semiconductor memory 3 of several M bits. When a few seconds have passed and the semiconductor memory 3 becomes full of information, the system control unit 6 may detect this state and stop the recording operation, and at the same time, display that fact on the display unit 18.

Next, the reproducing operation will be described. The reproduction is started by the reproduction start key to the key input unit 19. First, the memory control unit 4 reads the compressed digital signal stored in the semiconductor memory 3 from the semiconductor memory 3. Next, this compressed digital signal is restored by the audio compression encoder / decoder unit 2. Decompression is the reverse of compression.
The restored digital signal is converted into an analog signal by the D / A conversion unit 5, which is reproduced as an audio signal and output to the outside.

Since the audio information is recorded and reproduced without using the magneto-optical disk storage medium as described above, it can be used for recording for several seconds. Note that all the above operations are controlled by the system control unit 6 equipped with a microcomputer.

In another voice recording / reproducing apparatus using digital recording and having a large-capacity semiconductor memory like a digital micro recorder, the same function can be realized by applying the present invention.

[0016]

The present invention has the following effects. You can record a little conversation or something you want to remember like a memo for a short time without using a mini disk, and the sound quality is very good. In addition, this recording / playback method does not require a new circuit and can be handled only by changing the built-in software. Further, it is natural that the disk does not need to be rotated by the motor during the recording / playback of the present invention, so the power consumption of the device is small.
In the present invention, the recording time can be easily extended by increasing the capacity of the memory used for shock proof.

[Brief description of drawings]

FIG. 1 is a block diagram of an information recording / reproducing system to which an embodiment of the present invention is applied.

[Explanation of symbols]

 1 A / D conversion unit 2 Audio compression encoder / decoder unit 3 Semiconductor memory 4 Memory control unit 5 D / A conversion unit 6 System control unit 7 FEM encoder / decoder unit 8 Recording head drive unit 10 RF amplifier / address decoder unit 11 Support Control unit 12 Optical pickup unit 14 Spindle motor unit 15 Recording head 16 Reproducing head 17 Magneto-optical disk 18 Display unit 19 Key input unit 19a Designated key

Claims (1)

[Claims] 1. A voice compression means for A / D converting a voice signal and compressing the digital signal, a recording means for EFM-modulating the voice data by the voice compression means and writing the same on a recording medium, and a writing means written by the recording means. Reproduction means for reading data on the recording medium with a pickup head for EFM demodulation, memory control means for controlling a memory for supplementing missing data when the pickup head makes a trunking jump, and the reproduction through the memory control means. In the information recording / reproducing system having at least a voice decompressing means for decompressing the compressed voice of the means and performing D / A conversion, a key input means for designating writing / reading on the recording medium or writing / reading on the memory. And writing compressed data by the audio compression means to the recording medium and to the memory And recording destination switching means for switching the recording destination, recording source switching means for switching the recording source for both reading from the recording medium and reading from the memory, and designation by the key input means. According to the information recording / reproducing system, the recording destination is controlled by the recording destination switching means in the audio signal input mode, and the recording source is controlled by the recording source switching means in the audio signal output mode.