KR100361440B1 - Method and apparatus for repeatedly playing optical magnetic recording and playing device - Google Patents

Abstract

PURPOSE: A method and an apparatus for repeatedly playing an optical magnetic recording and playing device are provided to repeatedly hear a section divided by a non-sound signal by detecting the non-sound signal according to input of a repetitive reproducing signal. CONSTITUTION: A non-sound detector(11) detects a non-sound part from a regenerative signal. A memory(4) memorizes an address corresponding to the non-sound part detected by the non-sound detector. In the case of receiving a repetitive reproducing command, a microcomputer(10) controls to repeatedly play data from non-sound information corresponding to an address most adjacent to the current position to the current position information.

Description

Repeated playback method and apparatus of magneto-optical recording / reproducing apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repetitive reproduction method of a magneto-optical recording and reproducing apparatus. In particular, in the mini-disc system (MDS), the address of the data currently being reproduced and the address for the silent portion are stored, and the data between the silent portions is repeatedly reproduced. The present invention relates to a method and an apparatus for repetitive playback of a mini disk system (MDS) capable of this.

In general, as shown in FIG. 1, a schematic configuration of a mini disc system (MDS) is an analog signal output from a tape when a data such as a normal cassette deck tape or a compact disc is copied to a mini disc during recording. An A / D converter 1 for converting a digital signal into a digital signal, a compression extension encoder 2 for compressing a bit rate of a data signal digitally converted by the A / D converter 1, When recording and recording, temporarily store the digital signal compressed by the compression extension encoder (2) in the memory (4), and during playback, temporarily store the data output from the recording and playback section (3) in the memory (4). The compressed signal, which is compressed by the compressed expandable encoder 2 and temporarily stored in the memory 4, is synchronized with the actual recording bit rate and compressed by the compressed extended decoder 8 at the time of reproduction. A memory controller 5 for synchronizing the compressed signal temporarily stored in (4) to the actual recording bit rate, and an error correction code or the like in a signal stored in the memory 4 by the memory controller 5; In the channel encoder 6 and the recording / reproducing section 3 for lowering an error rate and adding an address to be written in the recording / reproducing section 3 to the signal output from the memory 4 at the same time. The error collection code of the read signal is decoded and the channel decoder 7 for separating the address and the data, and the compressed signal read out from the memory 4 or the recording / reproducing section 3 at the time of reproduction are extended and stretched to the original signal. A decompression decoder 8 for outputting the number of bits to the following D / A converter 9 according to the output bit rate, and a digital signal converted to the original bit rate by the decompression decoder 8 D / A converter 9 for converting the signal into an analog signal, and a memory controller 5 for controlling a corresponding operation as a function key is input.

The operation of the conventional magneto-optical recording / reproducing apparatus thus constructed is as follows.

At the time of recording and recording, the reproduction signal digitally converted by the A / D converter 1 is input to the compression extension encoder 2.

The compression extension encoder 2 compresses the bit rate of the digital signal input from the A / D converter 1 by 0.25 times.

In a real mini disk system (MDS), audio compressed data in one cluster is treated as 424 bytes of compressed data as a unit.

This is called a "sound group", which allocates 212 bytes of left and right channels.

When the compressed data is extended, data corresponding to the left and right channel 512 samples is matched with the time base information.

One sample consists of two 8-bit words.

Thus, the number of bytes is 512 * 2 * 2 = 2048 and the compression ratio is 424/2048, which is about 1/5.

Since the time to play one sound group is 11.6 ms, the bit rate is 292.4 kbps.

The compressed data arranges 11 sound groups in units of 424 bytes in two sectors. In the first sector, five groups of left and right channels, one group of right channels and five groups of left and right channels are recorded.

In the second sector, the right channel of the 1 group and the left channel of the 5 group are recorded (212 * 1 + 424 * 5 = 2332 bytes).

This records compressed data of 11 * 32/2 = 176 sound groups in 32 sectors in a cluster.

When recording from a compact disc (CD) or a regular cassette deck tape, the bit rate is compressed to 1/5 to record on a mini disc.

Therefore, since the bit rate of the compressed signal at the time of recording is different from the bit rate of the signal recorded on the actual medium, it is first input to the memory controller 5 and stored in the memory 4 in order to synchronize it.

The signal stored in the memory 4 is input to the channel encoder 6 to lower the error rate, and then added to the medium by the recording and reproducing unit 3 with an ECC (Error Correction Code) or the like added thereto.

At the time of reproduction, the data read by the recording / reproducing section 3 is input to the channel decoder 7 so that an ECC (Error Correction Code) is decoded, the address and the data are separated, and then input to the memory controller 5.

The data of the reproduction signal input to the memory controller 5 temporarily stores the data in the memory 4 via the memory controller 5 so as to match the bit rate between the compression extension decoder 8 and the channel decoder 7. .

At this time, the address of the data is matched with the address of the memory 4 so as to be searchable.

The data is read back from the memory controller 5 to the memory 4 and transmitted to the compressed expansion decoder 8 and restored to the original data by the compressed expansion decoder 8, and the number of bits increased according to the output bits. Transfer to A converter (9).

When playing a mini disc for language training in a mini disc system (MDS) capable of copying and playing, when the user wants to repeatedly listen to an arbitrary section, the user has to inconvenience searching the disc by key input at once. Finding the exact beginning of a sentence was cumbersome.

Therefore, the present invention has been made to solve the above problems, and the data for the reproduction signal, which is an output signal from the disk, is assigned to an address and temporarily stored in the memory. If a repeat playback key is input during playback with a microcomputer that stores the address of the memory, the playback operation up to the present time is stopped and the address for the playback data at the moment the repeat playback key is input is stored; Its purpose is to repeat the output of the playback signal stored in the memory by serially outputting the memory information from the address of the silent part of the address to the address of the moment when the repeat playback key is input to the memory. have.

In order to achieve the above object, the repetitive reproducing method of the magneto-optical recording / reproducing apparatus of the present invention detects a silent signal from the reproduced signal, stores an address for the most recent silent portion, and repeats the reproducing key during reproduction. Storing an address for the playback data at the moment when the repeat playback key is input, and repeatedly outputting a playback signal from the address of the most recent silent portion to the address at the moment the repeat playback key is input; It is characterized by.

The repetitive reproducing apparatus of the magneto-optical recording / reproducing apparatus of the present invention includes detecting means for detecting a silent portion from a reproduced signal, memory means for storing an address corresponding to the silent portion detected by the silent portion detecting means, and repetitive reproduction. It is characterized in that it comprises a control means for controlling to repeat playback from the silent information corresponding to the address closest to the current position to the current position information when there is a command.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of the present invention, when copying a recording of a general cassette deck tape (hereinafter referred to as tape) or a compact disc (hereinafter referred to as tape) to a mini disk, the analog signal output from the tape is converted into a digital signal. An A / D converter 1 for conversion, a compression extension encoder 2 for compressing the bit rate of the data signal digitally converted by the A / D converter 1, and the compression extension encoder for recording and recording The digital signal compressed in (2) is temporarily stored in the memory 4, and during reproduction, the data output from the recording / reproducing section 3 below is temporarily stored in the memory 4, and the compression-extension encoder 2 is used for recording. The compressed signal, which has been compressed in the memory 4 and temporarily stored in the memory 4, is synchronized with the actual recording bit rate and is compressed in the compression decompression decoder 8 described below to temporarily store the compressed signal in the memory 4 during playback. A suppression signal that was the memory controller (5) for synchronizing the actual recording bit rate. A channel encoder 6 for adding an error collection code or the like to a signal stored in the memory 4 to lower the error rate and adding an address to be written in the recording / reproducing section 3 to a signal output from the memory 4; The error collection code of the signal read out from the recording / reproducing section 3 is decoded and the channel decoder 7 for separating the address and the data, and the compressed signal read out from the memory 4 or the recording / reproducing section 3 at the time of reproduction. A decompression decoder 8 for outputting the original signal to the D / A converter 9 below to increase and increase the number of bits in accordance with the output bit rate, and converts the decompressed decoder 8 into the original bit rate. A magneto-optical recording / reproducing apparatus, comprising: a D / A converter 9 for converting a digital signal into an analog signal; The microcomputer 10 receives the address of data input from the memory 4 and the channel decoder 7 from the memory controller 5 while controlling a corresponding operation as a function key is input, and the D / Silent part detecting means 11 for detecting the signal for the silent part from the reproduction signal converted into analog by the A converter 9 and outputting it to the microcomputer 10 so that the memory controller 5 is controlled by the microcomputer 10. ), Including.

Referring to the operation of the present invention configured as described above are as follows.

The data read out from the recording / playback section 3 is input to the channel decoder 6 so that an ECC (Error Correction Code) is decoded, the address and the data are separated, and then input to the memory controller 5.

The data input to the memory controller 5 is temporarily stored in the memory 4 via the memory controller 5 for adjusting the bit rate between the compression extension decoder 8 and the channel decoder 7.

At this time, the address of the data is matched with the address of the memory 4 so as to be searchable.

The data is read back from the memory 4 in the memory controller 5 and transferred to the compressed extension decoder 8 and restored to the original data in the compressed extension decoder 8, and the number of bits increased according to the output bits. Transfer to the converter (9).

At this time, the output of the D / A converter 9 is output to the silent portion detecting means 11 to detect the silent signal.

As the user key-on the repeat play key, the microcomputer 10 stores the address of the moment when it is raised, and at the same time through the memory controller 5 through the memory controller 5, the address from the latest silent portion to the moment the repeat play key is turned on. Will output

Therefore, the corresponding data of the memory 4 is output to the compressed expansion decoder 8 via the memory controller 5 to be restored (extended) to the original data, and the number of bits increased according to the output bit rate is applied to the D / A converter ( Will be printed as 9).

If there is no data to be read on the memory 4, the data is outputted to the channel decoder 7, and the data of the recording and reproducing unit 3 corresponding to the aforementioned address is read to the channel decoder 7 and the memory controller. Via (5), the signal is output to the compressed extension decoder 8 and input to the D / A converter 9.

3 is a circuit diagram of the silent portion detecting means of FIG. 2, wherein the signal converted to analog in the D / A converter 9 of FIG. 2 is a half-wave rectifying means, and the anode and cathode of the diodes 31 and 32 are half-wave rectifying means. Are entered respectively.

The cathode of the diode 31 is connected to the non-inverting terminal (+) of the comparator 33 and the anode of the diode 32 is connected to the inverting terminal (-) of the comparator 33.

The reference voltage ① is input to the inverting terminal (-) of the comparator 33 and the reference voltage ② is input to the non-inverting terminal (+) of the comparator 34.

In addition, the outputs of the comparators 33 and 34 are connected to the OR gate 35, and the output side thereof is connected to the capacitor 36 having the other side grounded. The output of the OR gate 35 is connected to the microcomputer 10 of FIG. Is entered.

Accordingly, the signal converted to analog in the D / A converter 9 is half-wave rectified through the diodes 31 and 32 and is converted to the non-inverting terminal (+) of the comparator 33 and the inverting terminal (-) of the comparator 34. Is entered. The comparator 33 outputs a high signal only when the half-wave rectified signal input to the non-inverting terminal (+) is greater than the reference voltage ① input to the inverting terminal (−).

The comparator 34 outputs a high signal only when the half-wave rectified signal input to the inverting terminal (-) is smaller than the reference voltage ② input to the non-inverting terminal (+).

At this time, the output waveform of the comparator 33 is as shown in (b) of FIG. 4 and the output waveform of the comparator 34 is as shown in (c) of FIG.

The outputs of the comparators 33 and 34 are input to the OR gate 35 and the output thereof is as shown in FIG.

That is, when a waveform such as ③ in FIG. 4A is output from the D / A converter 9, the comparators 33 and 34 slice the waveform according to the respective reference voltages ① and ②. The waveform is output as shown in (b) and (c) of FIG.

At this time, the output of the OR gate 35 becomes low level only when the outputs of the comparator 33 and the comparator 34 are both low level.

Therefore, in the case of FIG. 4 as an example, the silence detector 11 of the present invention detects the silence when the low signal is output from the OR gate 35.

In this case, the silence detection signal, that is, the output of the OR gate 35 goes low even in a portion where zero crossing occurs as shown in ④ and ⑤ of FIG. 4, and the capacitor connected to the output terminal of the OR gate 35 is low. Discharged by 36 to maintain high. That is, the silence detection signal for a predetermined period or less is kept high.

As described above, the capacitor 36 discharges at a portion where zero crossing of FIG. .

5 is a flowchart of the present invention, when a signal of a playback key is input to the microcomputer 10 from an external remote controller (not shown) or a key input terminal (step 501), the data read from the recording / playback section 3 is a channel recorder. In (7), the address and data are separated and input to the memory controller 5, and the bit rate is adjusted in the compressed expansion decoder 8 and the channel decoder 7 and stored in the memory 4 (step 502).

The data output again from the memory 4 is transmitted to the compression extension decoder 8 via the memory controller 5 and output to the outside through the D / A converter 9 as a reproduced signal and at the same time the address for the final silent signal. Is stored in the microcomputer 10 (step 503).

When the repeat play key is input, the microcomputer 10 storing the address of the last input silent signal stores the address of the data at the moment the repeat play key is input and inputs the repeat play key from the address for the last silent signal. The address up to the moment is output to the memory controller 5 (step 504).

The memory controller 5 judges whether or not data for the input address is stored in the memory 4 (step 505).

Data for an address input from the memory controller 5 onto the memory 4 is read into the memory controller 5.

The read data is output to the D / A converter 9 via the decompression decoder 8 (step 506).

If there is no data for the corresponding address on the memory 4, the memory controller 5 is controlled to output the address of the section to be repeatedly reproduced by the channel encoder 6 to channel the data of the recording / reproducing section 3 to the channel. The signal inputted to the decoder 7 (step 507) and input to the memory controller 5 proceeds from step 507 to step 506, is stored in the memory 4, and is then converted into original data by the decompressed decoder 8 and stretched. The number of bits is output to the D / A converter 9 in accordance with the output bit rate.

The present invention configured as described above has the advantage of repeatedly listening to the section divided by the silent signal by detecting the silent signal according to the input of the repeat playback key.

1 is a schematic schematic block diagram of a magneto-optical recording device.

2 is a schematic block diagram of the present invention

3 is a circuit diagram of the silent detection means of FIG.

4 is a waveform diagram of each part of FIG.

5 is a flow chart of the present invention

Explanation of symbols for the main parts of the drawings

10: microcomputer 11: silence detector

Claims (4)

Detecting a silent signal from the reproduction signal and storing an address for the most recent silent portion; Storing the address of the playback data at the moment the repeat playback key is input if the repeat playback key is input during playback; And repeatedly outputting a reproduction signal from an address of the most recent silent portion to an address at the moment when the repetitive reproduction key is input. Detecting means for detecting a silent portion from the reproduced signal; Memory means for storing an address corresponding to the silent portion detected by the silent portion detecting means; And control means for controlling to repeat playback from the silence information corresponding to the address closest to the current position to the current position information when there is a command of repeat playback. The method of claim 2, wherein the silent portion detecting means A first comparator configured to receive a reproduction signal from the non-inverting terminal and to receive and compare a first reference voltage to the non-inverting terminal; A second comparator configured to receive the reproduction signal through an inverting terminal and receive and compare a second reference voltage with a non-inverting terminal; And a logic unit for ORing the outputs of the first and second comparators. The method of claim 3, wherein And a capacitor configured to charge / discharge an output of the logic unit and grounded at one side thereof at an output end of the logic unit.