JPH0785639A - Disk device - Google Patents

Abstract

PURPOSE:To specifically reproduce an arbitrary information and to reproduce information in the order of the program which is beforehand set by detecting division between information when inputting plural analog audio signals such as music. CONSTITUTION:When the recording, that is, sound recording of an analog sound music inputted from a terminal 9 is started, the leading address of an empty area, in which a recording is possible on a disk 1 is defined as a playing start address and a music start/stop address information from a memory 7 is registered to an address information storage area 71. Then, analog music data are converted into digital audio signals using an A/D converter 10 and the fetching of the music data is started. When a specified amount of data is stored in the area 71, the music data are successively written into the empty area of the disk 1 in the order of first-in music data. During the writing, the signals from an intermusic detecting circuit 13 are monitored to discriminate whether it is an intermusic or not and when the recording is completed, a completion address is registered in the area 71.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an MD (mini disc).
Etc. to a disc device for writing information on the disc and playing the disc on which the information is written to reproduce the information.

[0002]

2. Description of the Related Art A disk device for recording information such as music on an MD capable of recording information and reproducing the information by playing the recorded MD is capable of recording as well as reproduction. , Is becoming popular as a next-generation disc device that replaces a CD player that plays a reproduction-only CD (compact disc).

Such a disk device is supplied with a digital audio signal carrying information such as a music piece, and is subjected to band compression and E
In the case of a music piece, a predetermined signal processing such as FM modulation is applied.
Normally, multiple songs are written on the MD and recorded. A groove called a pre-groove is provided on the disc in the recording area of the MD, and the writing position, that is, the address on the disc can be identified by the pre-groove. On the other hand, the information of the digital audio signal supplied is EIAJ.
Since the address is already managed by the serial data specified by the digital audio interface specification of, the recording start address and the recording end address of each of a plurality of songs are registered in the memory in the device and the address management is performed by the microcomputer. It can be performed.

Therefore, after recording these plural songs,
It is possible to specify and play a song of any song number,
It is also possible to perform the program performance in a predetermined order. Further, in the case of MD, a TO for recording control information
User TOC (UTOC) that users can use for C
Is provided, and address information of a plurality of recorded songs is recorded.

[0005]

Some of the above-mentioned conventional disk devices are equipped with an A / D converter so that information of an analog audio signal can be recorded. However, the song of the analog audio signal supplied is
Even in the case of a plurality of songs, it is regarded as one song in address management, and there is a problem that it is not possible to perform a designated performance or a program performance of an arbitrary music such as a music of a digital voice signal.
There is also a problem that the area of the user TOC released to the user cannot be effectively used.

The present invention solves the above-mentioned conventional problems, and even when a plurality of pieces of information of an analog audio signal are converted into information of a digital audio signal and recorded on a disc,
It is an object of the present invention to provide an excellent disk device which enables designated reproduction of arbitrary information and can effectively use a user TOC area.

[0007]

In order to achieve the above object, a disk device according to the present invention has a signal conversion means for converting an analog voice signal carrying information into a digital voice signal, and the converted digital voice signal. A signal processing means for performing a predetermined signal processing, an information writing means for writing information of a digital audio signal obtained from the signal processing means on a disc, and a write start address and a write end address of the information written on the disc. Means for registering the information, a no-signal detection means for transmitting a no-signal detection signal when the level of the analog audio signal is equal to or lower than a predetermined value, and a write start address and a write for the information according to the no-signal detection signal. And a control means for determining an end address.

[0008]

Therefore, according to the disk device of the present invention, when inputting a plurality of pieces of information of an analog audio signal such as a music piece, by detecting a boundary between the pieces of information,
Even when these pieces of information are recorded on the disc, the start address and end address of each piece of information can be managed, so it is possible to specify any information and play it back, or play back in a sequence according to a predetermined program. And
The user TOC area can be effectively used.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a schematic block diagram of an embodiment of a disk device according to the present invention. The disc played by this disc device may be a CD or an MD, but here, the disc device playing the MD will be described. In such a disc device, a signal processing technique unique to the MD system is used. This is ATRAC (Adaptive TRansform A
With a signal processing technique called coustic coding, digital information can be band-compressed to about one-fifth, recorded, and expanded at the time of reproduction to obtain characteristics comparable to a CD.

In order to perform this band compression and expansion, an encoder and a decoder are used, as well as a memory for storing the compressed data read from the MD and a memory controller for controlling the writing and reading of this memory. However, such components are omitted in FIG. 1 since they are not directly involved in the present invention except for the memory. Further, for the same reason, the EFM encoder / decoder that demodulates 14-bit data into 8-bit data is not shown in FIG.

In FIG. 1, reference numeral 1 denotes a disc (MD) capable of compressing and recording information (the information in this case is a plurality of music pieces). Reference numeral 2 is a spindle motor (SM) that rotationally drives the disk 1. Reference numeral 3 denotes a pickup (PU) as an information writing means for writing information by irradiating the disk 1 which is driven to rotate by the spindle motor 2 with a light beam modulated by writing information. The pickup 3 also has a function as a reading unit that irradiates a disc on which information is recorded with a light beam, receives the light beam reflected by the disc, and outputs a read signal.

Reference numeral 4 is a control circuit for driving the spindle motor 2 and the pickup 3. Reference numeral 5 denotes a signal processing unit as a signal processing unit that performs a predetermined signal processing on a signal carrying write information or a read signal from the pickup 3.
The signal processing unit 5 compresses data to be recorded on the disc 1, writes / reads to / from a memory, performs signal processing such as EFM modulation, and outputs a write signal to the pickup 3, and the recording circuit 51. It has a reproducing circuit 52 that performs signal shaping such as waveform shaping of the obtained read signal, EFM demodulation, writing to and reading from the memory, and data expansion.

Reference numeral 6 denotes a microcomputer as a control means for controlling the entire disk device, which is not shown in the figure, but is provided with a register for temporarily storing an address relating to a music piece to be recorded. Reference numeral 7 is a memory capable of writing and reading data, and this memory 7 is provided with a music data storage area for storing band-compressed music data. This memory 7 is usually a signal processing unit 5.
Although a memory controller (not shown) controls writing and reading of music data, the memory is a memory controlled by the microcomputer 6 for convenience of explanation. Further, the memory 7 is provided with a music start / end address information area 71, and stores a music start address and a music end address which are position information on the disc for each recorded music. However, the memory provided with the music start / end address information area may be provided separately from the memory provided with the music data storage area so that the microcomputer 6 can directly control the memory.

Reference numeral 8 is a terminal for inputting a digital audio signal,
Reference numeral 9 is a terminal for inputting an analog audio signal. Reference numeral 10 is an A / D converter as a signal converting means for converting an analog voice signal from the terminal 9 into a digital voice signal. 11
Is a digital voice input signal from terminal 8 or A / D
It is a switch for selecting one of the analog audio input signals from the terminal 9 converted by the converter 10. 1
Reference numeral 2 denotes a D / A converter that converts a digital reproduction signal from the reproduction circuit 52 of the signal processing unit 5 into an analog reproduction signal and supplies the analog reproduction signal to a main amplifier (not shown).

Reference numeral 13 denotes a music interval detection circuit having a characteristic configuration of the present invention, which is a no-signal detection signal when the level of the analog audio signal A from the terminal 9 is below a predetermined value (threshold level; TH). A no-signal detecting means for transmitting the inter-track detection signal B to the microcomputer 6 is configured. FIG. 2 is a diagram showing a signal waveform in the inter-track detection circuit 13.

In FIG. 2, (a) shows the waveform of the analog audio signal A of a plurality of continuous songs (m, m + 1, ...) And the threshold level (TH). In the inter-track detection circuit 13, when the level of the analog audio signal A is higher than the threshold level TH, a high level signal indicating that there is a signal is sent out, and when the level of the analog audio signal A is below the threshold level TH. , Send out a low level signal. FIG. 2B shows the waveform of the inter-track detection signal B sent from the inter-track detection circuit 13 to the microcomputer 6. As shown in (b), the m-th song started at time t0 ends at time t1, and the period T until the start time t3 of the next m + 1-th song is detected as a song interval. 2 (c) shows the performance start address and the performance end address of the music recorded on the disc 1, which will be described later.

FIG. 3 is a flow chart executed by the microcomputer 6 in FIG. The operation of the disk device according to the present invention shown in FIG. 1 will be described with reference to this flow chart.

When recording of an analog voice type music inputted from the terminal 9 is started, that is, recording is started, first, the head address of the recordable empty area on the disk 1 (this address is designated as "d0") is the mth address. The song start / end address information storage area (hereinafter, simply referred to as "address information storage area") of the memory 7 as a performance start address of the tune (m = n + 1; n = 0, 1, 2, ... When n songs have been recorded). (Referred to as) 71 (step S1). FIG. 4 shows the memory 7
It is a figure which shows the address information storage area 71 in. Figure 4
As shown in FIG. 3, the address information storage area 71 stores the song number, and the play start address and play end address of the recorded song on the disc 1.

Next, the music data storage area of the memory 7 starts to take in the music data converted into a digital audio signal by the A / D converter 10 and subjected to a predetermined signal processing (step S2). When a certain amount of music data is stored in this music data storage area, writing is started from the head address "d0" of the recordable free area of the disc 1 in order from the music data stored first (step S
3).

During this writing, the inter-track detection signal B from the inter-track detection circuit 13 is monitored to determine whether or not it is the inter-track (step S4). If it is not the inter-track, it is not shown. The recording end command from the operation unit is monitored to determine whether or not the recording has ended (step S5). If the recording is not finished, the process proceeds to step S4. If the recording is finished, the address recorded on the disk 1 is recorded in the address information storage area 71 of the memory 7 as the performance end address of the final song (m-th song). Register (step S6).

In step S4, if there is a music piece, whether or not the music piece detection signal B indicates a music piece interval for continuous T1 seconds, that is, the music piece time length in FIG. 2B continues from t1 to t2. It is determined whether or not (step S7). This is because the audio signal level may temporarily fall below the threshold depending on the content of the piece of music, so that it is possible to reliably detect the interval between pieces of music. When the music interval detection signal B indicates a music interval between continuous T1 seconds, the address "d1" on the disk 1 which is currently being written is set as the performance end address of the m-th music, and the memory 7 as shown in FIG. It is registered in the address information storage area 71 (step S8). Further, as shown in FIG. 2C, the address "d1 +" next to the performance end address "d1" of the m-th song on the disk 1
1 "as the performance start address of the (m + 1) th song.
It is temporarily stored in the register 61 of the microcomputer 6 shown in (step S9), and the writing of music data to the disk 1 is temporarily suspended to put it in a recording standby state (pause state) (step S10). However, in this case, the music data input from the terminal 9 through the A / D converter 10 is continuously taken into the music data storage area of the memory 7. If the music data storage area is full, the old music data, that is, the music data written first is overwritten (rewritten) in order. Then, it is monitored whether or not it is between songs (step S11), and if it is between songs, it is judged whether or not recording is finished (step S12). If it is not finished, the process proceeds to step S11.

If there is a music piece in step S11, it is determined whether the music piece detection signal B is at a high level for continuous T2 seconds. This is because the voice signal at the start of the song has a transient characteristic, so that a period of T2 seconds is provided in order to reliably detect the start of the voice signal. That is, in step S13, it is determined in the period T2 whether or not the (m + 1) th song has started. If the m + 1st song has not started, the process proceeds to step S11. If the m + 1th song has started, the address "d1" temporarily stored in the register 61 of the microcomputer 6 is shown in FIG.
+1 "is registered in the address information storage area 71 of the memory 7, and the pickup 3 is made to access the address" d1 + 1 "on the disc 1 (step S14). Therefore, the time length between songs on the disc 1 is always constant. Time (T
It becomes 1).

In FIG. 2, assuming that the time at which the m + 1th song starts is t3, the music data written in the music data storage area of the memory 7 is sequentially written to the disc 1 in order from the music data written a predetermined time before the time t3. Writing is restarted in the area after the address "d1 + 1" (step S15). This is because it takes some time from when the beginning of the song of the music data is detected to when the recording is actually started, and if the song is recorded as it is, the beginning of the song will be cut off. Even in the recording standby state, the music data is sequentially written in the memory 7,
At the start of recording, the music data written in the memory 7 a certain time ago is written to the disc 1 to prevent the occurrence of headache.

Next, a counter (not shown) of the microcomputer 6
The value of the song number of is updated from m to m + 1 (step S1
6) Then, the process goes to step S4 to further monitor the next song. In this way, unless recording is completed, the processing from step S4 to step S16 is repeatedly executed to record the songs to be input in the order of input.

After the performance end address of the final song is registered in step S6, or when the recording ends in step S12, the address information storage area 7 of the memory 7 is displayed.
User TOC of disk 1 with the address registered in 1
Write to (UTOC) (step S17). Therefore,
When the disc 1 is reproduced after recording music data, the address written in the user TOC is referred to, the number of an arbitrary song is designated and the disc is reproduced, or an order according to a predetermined program is set. The user TOC area can be effectively used.

In the above-described embodiment, the recording is automatically restarted from the recording standby state at the beginning of the next tune, but the recording is restarted from the recording standby state by the recording command from the operation unit. Is also good.

Further, in the above embodiment, the disk 1
Although the information to be written in is music data, it may be human conversation or various sound effects. Further, it is needless to say that the present invention can be applied to the case of recording not only audio information but also image information on a disc.

[0028]

According to the disk device of the present invention, by providing the no-signal detecting means for detecting the delimiter which is a period in which there is no signal between information of a plurality of information of the input analog audio signal, Even when the information of the analog audio signal is recorded on the disc, the start address and end address of each information can be managed, so it is possible to specify any information and play it back, or play it in the order according to a predetermined program. And the effect that the user TOC area can be effectively used.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an embodiment of a disk device according to the present invention.

FIG. 2 is a diagram showing a signal waveform in the inter-track detection circuit in FIG.

FIG. 3 is a flow chart executed by a microcomputer in FIG.

FIG. 4 is a diagram showing an address information storage area in the memory in FIG.

[Explanation of symbols]

 1 Disc 3 Pickup (Writing Means) 5 Signal Processing Unit (Signal Processing Means) 6 Microcomputer (Control Means) 7 Memory (Storage Means) 10 A / D Converter (Signal Converting Means) 13 Inter-Song Detection Circuit (No Signal Detection) means)

Claims (2)

[Claims] 1. A signal converting means for converting an analog voice signal carrying information into a digital voice signal, a signal processing means for subjecting the converted digital voice signal to a predetermined signal processing, and a digital signal obtained from the signal processing means. Information writing means for writing the information of the audio signal on the disc, storage means for registering the write start address and the write end address of the information written on the disc, and the level of the analog audio signal is below a predetermined value. A disk device, comprising: a no-signal detection means for transmitting a no-signal detection signal to the first and a control means for determining a write start address and a write end address of the information according to the no-signal detection signal. . 2. The signal processing means comprises storage means for storing the data of the digital audio signal, and the control means, when receiving the no-signal detection signal, causes the information writing means to enter a recording standby state, 2. The data of the digital audio signal is stored in the storage means during the recording standby state, and the data stored during the recording standby state is read out when the recording is resumed and written to the disc. The disk device described.