JP2001043668A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize a simultaneous sound recording monitor function by forming a WAVE file without overwriting of sample data already checked to be normally recorded. SOLUTION: The file for recording recorded speeches of the optical disk device having the simultaneous sound recording monitor function which reproduces the recorded speeches right after recording and records the reproduced sounds while monitoring these sounds is the WAVE file of an RIFF (release interchange file format) file type consisting of an RIFF header 101 having file size data indicating the size over the entire part of the file, a format chunk 102 having the data indicating the format of the stored data, a WAVE data chunk 103 consisting of a chunk header having the file size data indicating the size over the entire part of the stored speech data and the speech data and a chuck 104 for size regulation. The file size of the size regulation described above is so set that the sum of the file size for size regulation, the file sizes of the RIFF header, the format chunk and the chunk header attains integer times the sector size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus, and more particularly to an optical disk apparatus having a simultaneous recording function capable of continuing recording while reproducing and monitoring audio recorded on the optical disk immediately after recording.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei 5-234252 discloses an optical disk apparatus having a simultaneous recording monitor function capable of continuing recording while reproducing and monitoring audio recorded on the optical disk immediately after recording. ing. This optical disk apparatus uses a single recording / reproducing head, compresses the time axis of audio data input at a constant rate, records the data on the optical disk in a shorter time than the input time of the audio data, and inputs the audio data. The time during which no audio data is recorded during the period is obtained. During the time when the audio data is not recorded, the data recorded before that is reproduced from the optical disk, and the reproduced data is expanded at the time axis and reproduced at a constant rate. The operator can continue recording while monitoring the reproduced sound.

FIG. 3 shows a conventional optical disk. As shown in the figure, the optical disc has a plurality of physical sectors (sector 1, sector 2,...) Obtained by dividing a recording track into a plurality.
(Sector N ...). Note that the minimum unit of data to be recorded on the optical disc is a sector unit, and it is not possible to record in a smaller unit.

FIG. 4 is a diagram showing a recording format when audio data is recorded as a WAVE file in a sector of an optical disk.

A WAVE file is a RIFF (Resource
Interchange File Format), which has the characteristic that various data can be stored as blocks in one file. The WAVE file is formed of a RIFF header, a format chunk ("chunk" means a block), and a WAVE data chunk including a chunk header and audio data. The RIFF header, format chunk, and WAVE data chunk are , Are sequentially recorded in a plurality of sectors as shown in FIG.

[0006] The RIFF header contains an R
A portion indicating the size of the entire WAVE file after the “WAVE” portion of the IFF header;
The data chunk has a portion indicating the sampling data size of the WAVE data chunk (the size of the entire audio data).

FIG. 5 is a diagram showing a basic structure of the WAVE file (in the case of PCM data). In the figure,
Reference numeral 101 denotes a RIFF header, a “RIFF” portion indicating that the file is a RIFF file, and “W” of the RIFF header.
The “WAVE” portion indicates the size of the entire WAVE file after the “AVE” portion, and the “WAVE” portion indicates that the file is a WAVE file. The size of each of these parts is 4 bytes. Therefore, the "subsequent size" portion indicates the size obtained by subtracting 8 bytes from the size of the entire WAVE file.

Reference numeral 102 denotes a format chunk indicating the format of the stored data. The format chunk is “fm” indicating that the format chunk is a format chunk.
t "part," chunk size after "part indicating the size after format chunk" type "part, and format type, number of channels, sampling rate, average transfer byte count, sample size, quantization bit number. The "type", "number of channels",
It consists of "sampling rate", "average number of transfer bytes", "sample size", and "quantization bit number". Each of these parts is 4 bytes in size.

Reference numeral 103 denotes a WAVE data chunk.
The WAVE data chunk is a chunk header 103A including a “data” portion indicating a WAVE data chunk, a “sampling data” portion indicating the size of the “sampling data” portion of the WAVE data chunk, and sampling of audio data. It consists of a "sampling data" part which is sampling data obtained by the above. The size of each of the “data” portion and the “size after chunk” portion is 4 bytes.

The RIFF header 101, format chunk 102, WAVE data chunk 103
As shown in FIGS. 4 and 5, the data size of the data composed of the chunk header 103A included in the data is generally not an integral multiple of the data size of the unit sector, but is usually smaller than the sector size.

In the optical disk device, when the start of recording is instructed, the control unit of the optical disk device stores the RIFF header 101, format chunk 102, and WAVE data chunk 10 in a recording buffer built in the device.
3 after writing the chunk header 103A included in
The sampling data of the input audio is written sequentially. At this time, the “after size” portion indicating the size of the whole WAVE file after the “WAVE” portion of the RIFF header and the “size after chunk” indicating the size of the “sampling data” portion of the WAVE data chunk are For example, “0” is written as temporary data.

When data for a unit sector, which is the minimum unit of recording, is written to the recording buffer, the data is recorded on an optical disk. Thereafter, the recording of the sampling data is continuously performed in sector units until the stop of the recording is instructed.

When the stop of recording is instructed, the data of the sector where the recording was first performed, that is, the data of the first sector is read, and the "WAVE" portion of the RIFF header in which the temporary data is recorded is read out of the data. Subsequent WAVE
A "subsequent size" portion indicating the size of the entire file and a "subsequent size" portion indicating the size of the "sampling data" portion of the WAVE data chunk,
The data is replaced with the actual data determined after the recording is stopped, and the sector is overwritten again, thereby completing the recording.

The optical disk apparatus uses a single recording / reproducing head, compresses the audio data input at a constant rate on the time axis, and records the data on the optical disk in a shorter time than the input time of the audio data. Obtaining a time during which the recording of the audio data is not performed during the input period of the audio data, and reproducing the data recorded during the time during which the recording of the audio data is not performed from the optical disk, and expanding the reproduced data on the time axis. The reproduction at a constant rate and monitoring are as described above.

[0015]

As described above, when the stop of the recording is instructed, the control device of the optical disk apparatus determines the temporary data portion in the data of the sector where the recording was performed first after the recording is stopped. The sector is replaced with actual data, and the sector is overwritten again.

By the way, the data recorded in the first sector on which the recording was first performed usually includes the head of the audio data as described above. This part is controlled by the simultaneous monitoring function of the optical disk device.
This is confirmed audio data that has been confirmed by the operator to be recorded normally.

Therefore, if the first recorded sector is overwritten, the head portion of the audio data is also overwritten, so that it is necessary to monitor and confirm again.

The present invention has been made in view of the above-mentioned problems, and the data size from the RIFF header of the WAVE file to the chunk header portion of the WAVE data chunk is set to an integral multiple of the sector size of the optical disc, and the data size has been confirmed. Provided is an optical disk device that does not overwrite audio data.

[0019]

The present invention employs the following means in order to solve the above-mentioned problems.

In an optical disc apparatus having a simultaneous recording monitoring function of reproducing the sound recorded on the optical disc immediately after recording from the optical disc and recording the reproduced sound while monitoring the sound, the file for recording the sound has a size of the entire file. A RIFF header including file size data indicating the size obtained by subtracting 8 bytes from the data, a format chunk including data indicating the format of the stored data, and file size data indicating the entire size of the stored audio data. A WAVE data chunk comprising a chunk header and audio data provided therein and a WAVE file in a RIFF file format comprising a chunk for size adjustment, wherein the file size of the chunk for size adjustment is the file size of the chunk for size adjustment, the RIFF header , Wherein the sum of the sizes of the serial format chunk and the chunk header is set to be an integer multiple of the sector size.

Further, in the optical disc device, the file size adjusting chunk is a dummy chunk.

Further, in the above optical disk device, the file size adjusting chunk is an existing chunk.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing an optical disk device according to an embodiment of the present invention. In the figure, 1
Is an optical disk device, 2 is an optical disk drive that performs recording and reproduction on the optical disk, 3 is an operation unit having operation buttons for instructing recording and reproduction, and a jog dial for performing operations such as cueing, 4 is an operation state of the optical disk device and A display section 5 for displaying various information such as a recording / reproducing time is an audio output section, and a demodulation circuit for demodulating audio data reproduced from the optical disc and a predetermined amount of the demodulated audio data are accumulated and output, for example, in sector units. It comprises a reproduction buffer and a D / A (Digital / Analog) converter for converting digital audio data output from the buffer into analog audio data. Reference numeral 6 denotes an audio input unit, which converts A / D (Analog / Di) to convert analog audio data into digital audio data.
gital) converter, a recording buffer for accumulating a predetermined amount of digital audio data and outputting the data in, for example, a sector unit, and a modulation circuit for modulating the digital audio data output from the buffer into a recording format. A control unit 7 controls the optical disk drive 2, the operation unit 3, the display unit 4, the audio output unit 5, and the audio input unit 6 to control operations such as recording, reproduction, and editing.

FIG. 2 is a diagram showing a basic structure (in the case of PCM data) of a WAVE file according to the present embodiment. In the figure, reference numeral 104 denotes a dummy chunk, which includes a “dummy” portion indicating the dummy chunk, a “size after the chunk” indicating the size of the dummy chunk, and a “000. In the figure, the same portions as those shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

Next, the operation of the optical disk device will be described. First, the control unit 7 of the optical disk device reads and records the physical sector size, disk capacity, disk management data, and the like of the optical disk inserted into the optical disk drive via the optical disk drive 2.
Next, when an instruction to start recording is input from the operation unit 3, the control unit samples the audio input to the audio input unit 6, captures the sampling data, and writes the captured sampling data to the recording buffer. . At the same time, data such as the sampling rate, the number of quantization bits, and the number of channels are obtained.

Next, the controller 7 controls the optical disk drive 2
, The head address of the empty sector of the optical disk is obtained, the RIFF header 101 and the format chunk 102 of the WAVE file are generated from the information of the optical disk and the input audio data, and the total size is calculated. At this time, the size portion of the RIFF header is set to 0 as temporary data. Next, the controller 7 compares the sum of the total size and the size of the chunk header 103A of the WAVE data chunk with the sector size. At this time, the size of the chunk header is set to 0 as temporary data. Next, a dummy chunk 104 having a size such that when added to the sum of the sizes becomes an integral multiple of the sector size is generated. Next, the control unit compares the generated dummy chunk with the format chunk 102 and the WA.
Inserted between the VE data chunks 103, and the beginning of the WAVE file (RIF
(From the F header to the chunk header portion of the WAVE data chunk) is recorded at the head address of a free sector on the optical disc.

Next, when sampling data for the sector size is accumulated in the recording buffer, the sampling data is recorded in the next empty sector, and sampling data obtained by sampling the next audio data is accumulated in the recording buffer. I do. Similarly, every time sampling data of a sector size is accumulated in the recording buffer, the operation of recording the data in a free sector of the optical disk is continued.

When simultaneous recording monitoring is performed, the sampling data recorded immediately before on the optical disk is read out using the idle time formed during the recording in units of sectors as described above, and reproduced through the audio output unit. Then, confirm whether the recording was performed normally by monitoring.

When a stop of recording is instructed by the operation unit 3, the control unit 7 records the sampling data stored in the recording buffer on the optical disk, and also transfers the sampling data from the audio input unit to the recording buffer. Stop accumulation. Next, the control unit reads the head portion of the WAVE file again and reads the RI in which the temporary data is recorded.
A “following size” portion indicating the size of the entire WAVE file after the “WAVE” portion of the FF header and WAV
The "data size after chunk" indicating the size of the "sampling data" of the E data chunk is replaced with the actual data determined after the recording is stopped, and the sector is overwritten again to terminate the recording.

In the present embodiment, an example in which recording on the optical disk is performed in sector units has been described. However, a file allocation table (file) such as that performed by FAT16 which is a file management system such as Windows 95 is used.
Using an Allocation Table, it is also possible to perform recording on the optical disc in units called clusters in which one or more physical sectors are collected.

In this embodiment, in order to adjust the size of the head part (from the RIFF header to the chunk header part of the WAVE data chunk) of the WAVE file to an integral multiple of the sector size, the dummy chunk is divided into the format chunk and the WAVE data chunk. However, the insertion position of the dummy chunk may be between the RIFF header and the format chunk, or may be inserted in both.

In the present embodiment, in order to adjust the size of the head portion of the WAVE file to an integral multiple of the sector size, dummy chunks having no new meaning except for size adjustment are used as size adjustment chunks. Is inserted, but other existing chunks can be used instead of the dummy chunks if the chunk sizes match. Also, both the dummy chunk and another existing chunk may be inserted.

Although the present embodiment has been described as a WAVE file in which the sampling data is PCM data, the sampling data may be sampling data in another format, for example, a compressed data format.

The present invention can be applied to all optical disk devices using an optical disk having a physical sector structure.

[0035]

As described above, according to the present invention, it has been confirmed by the simultaneous recording monitor function that the recorded sound is reproduced and monitored immediately after recording, and the recording is continued, and that the recording has been normally performed. A WAVE file can be formed without overwriting the sample data, and the simultaneous recording monitoring function can be effectively used.

[Brief description of the drawings]

FIG. 1 is a diagram showing an optical disc device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a basic structure of a WAVE file according to the embodiment.

FIG. 3 is a diagram showing a conventional optical disc.

FIG. 4 is a diagram showing a conventional recording format.

FIG. 5 is a diagram showing a basic structure of a conventional WAVE file.

[Explanation of symbols]

 Reference Signs List 1 optical disk apparatus 2 optical disk drive 3 operation unit 4 display unit 5 audio output unit 6 audio input unit 7 control unit 101 RIFF header 102 format chunk 103 WAVE data chunk 103A chunk header 104 dummy chunk

Claims (3)

[Claims] 1. An optical disk apparatus having a simultaneous recording monitoring function of reproducing audio recorded on an optical disk from an optical disk immediately after recording and recording the reproduced sound while monitoring the reproduced sound, the file for recording the audio is an entire file RIFF header with file size data indicating the size of the stored data, format chunk with data indicating the format of the stored data, and chunk header with file size data indicating the total size of the stored audio data And a WAVE data chunk comprising audio data and a WAVE file in a RIFF file format comprising a chunk for size adjustment. The file size of the chunk for size adjustment is the file size of the chunk for size adjustment, the RIFF header, the format chunk. And an optical disk apparatus characterized by the sum of the file size of the chunk header is set to be an integer multiple of the sector size. 2. The optical disk device according to claim 1, wherein the file size adjusting chunk is a dummy chunk. 3. The optical disk device according to claim 1, wherein the file size adjusting chunk is an existing chunk.