JPH04351748A - Intermittent recorder for compressed audio data - Google Patents

Abstract

PURPOSE:To intermittently record sounds at the time of recording operation or preceding sounds with a recording mechanism unoperated. CONSTITUTION:When a recording mode is set by a mode setting means 7 in the power deenergisation state, power is simultaneously supplied to a data compressing and storing means and the recording mechanism; and when the stored data volume of a memory 3 reaches a certain value, a recording preparation command is inputted to the recording mechanism side, and stored data is quickly read out from the storage start address of the memory 3 in accordance with a recording command on the recording mechanism side and is supplied to the recording mechanism. When the recording mode is set by the means 7 in the power-energisation state, power is supplied to the recording mechanism, and stored data at the time of setting the recording mode or stored data of a certain time before is read out from the memory 3 in accordance with the recording command on the recording mechanism side and is supplied to the recording mechanism.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent playback apparatus for compressed audio data which enables power saving.

0002

2. Description of the Related Art Magneto-optical recording disk recorders are capable of recording audio data in CD format, but the disk diameter is increased to ensure recording time.
The recorder itself is also large, making it difficult to carry. Therefore, recently a standard has been proposed to compress audio data and record it on a small disk.

0
003]

[Problems to be Solved by the Invention] However, when a magneto-optical recording device is used for magneto-optical recording using a battery, a considerable amount of power is consumed especially for the recording current, so that the battery consumption causes
It is also predicted that it will be difficult to continuously record audio over the entire area of a disc at once. Therefore, it is possible to reduce the recording time by compressing the compressed audio data on the time axis and recording it intermittently in blocks, but it is possible to reduce the recording time by leaving the disk motor and pickup in the driving state before recording or during the recording pause period. Although this does not consume as much power as recording, it also wastes power, which is not desirable.

0004

[Means for Solving the Problems] Accordingly, the present invention links the storage of compressed audio data in a storage means and the activation of a recording mechanism with the recording operation, and after the activation is completed, the stored data is read out at high speed and recorded intermittently. The first feature is that the compressed audio data is stored cyclically in the storage means, and in conjunction with the recording operation, when the recording mechanism starts recording, the stored data after the operation time is read out and recorded. The first feature is that the compressed audio data is stored cyclically in the storage means, and in conjunction with the recording operation, the stored data including the stored data before the operation is read out and recorded when the recording mechanism starts recording. 3 characteristics.

[0005]

[Operation] Therefore, according to the first invention, the storage means and the recording mechanism are operated in conjunction with the recording operation, and the stored data accumulated during the activation period of the recording mechanism is synchronized with the start of recording of the recording mechanism. Recorded intermittently at high speed. According to the second invention, the recording mechanism operates in conjunction with the recording operation, and the storage data accumulated after the recording operation of the recording mechanism is recorded intermittently at high speed in conjunction with the recording start of the recording mechanism. Furthermore, according to the third invention, the recording mechanism operates in conjunction with the recording operation, and the storage data accumulated before the recording operation of the recording mechanism is recorded intermittently at high speed in conjunction with the recording start of the recording mechanism.

[0006]

[Embodiment] An embodiment in which the present invention is applied to a magneto-optical disk recording system will be explained below.

First, in this embodiment, guide tracks are formed in advance on the recording surface of the disc record, as in the conventional case.
This guide track is made to meander with a signal FM modulated using an ATIP code, and is reproduced as a tracking error signal during recording or reproduction. Further, the center frequency of the carrier of the FM signal is set to 22.05 MHz, and is used as a pilot signal for the disk servo during recording and reproduction. Further, the ATIP code indicates an absolute address from the recording start end to the recording end of the guide track, and is composed of information on minutes, seconds, and 1/75 second subcode frame number, and is recorded on the guide track at the subcode frame period. ing. The configuration described above is a well-known configuration as a format for a rewritable disc record.

The signal processing principle of this embodiment will be explained below with reference to FIG. In this embodiment, 2-channel audio signals are AD converted to 16 bits at 44.1 KHz and 1.
4112 bits/second audio data is formed. This data is 2352 per subcode frame as shown in the figure.
Become a part-time worker. In this example, this AD conversion data is 1/
Data is compressed to 5. With this data compression, 1/1
As shown in the figure, 5 seconds worth of audio data is compressed to 2325 bytes, which is exactly one subcode frame. This compressed data is sequentially stored in memory at low speed. The stored data is read out at high speed with 3 seconds worth of stored data as one block data. As shown in the figure, this data block is recorded with start and end identification data called link blocks for one subcode frame each added at the front and rear, and the recording period of the intermittent recording data is 47 (=1+45+1) subcode frames. Become.

The magneto-optical recording principle is also the same in this embodiment, and as shown in FIG. 1, two channels of analog audio are first supplied to the AD conversion means 1 as recording signals. This AD conversion means 1 converts each sample into one signal using a 44.1 KHz conversion clock similar to the CD format.
Converted to 6 bits. This AD converted data or digital audio input separately is supplied to the data compression means 2 at the next stage and compressed to 1/5. This compressed audio data is sequentially stored in the memory 3. This memory 3 is
During recording, the stored data is read out at high speed in units of 3 seconds, and the read data is processed by block encoding means 8.
CD-DA
The data is inputted to the encoding means 9 and then inputted to the head drive means 10 as intermittent recording data in CD format. As a result, the portion that is intensively heated by the high-power beam generated by the pickup 16 during the recording period is subjected to magnetic field modulation, and an intermittent recording track is formed.

The address generating means 4 in FIG. 1 generates a write address and a read address for the memory 3 to specify a write position and a read position. Further, the data amount detection means 5 subtracts the read address from the write address and if the difference is greater than one data block length,
It generates a recording preparation command. Further, the access control means 15 inputs a tracking error signal from the output of the reproduction amplifier 14 and also inputs a track jump pulse from the system control means 11 to move the pickup 8 and the objective lens in the pickup to move the pickup to a predetermined position. is moving to the scanning position. Further, the disk servo means 18 separates a tracking error signal in a higher frequency range than the reproduction amplifier output, and the average frequency thereof is 22.
The rotation of the disk motor 17 is controlled to keep the linear velocity constant so that the linear velocity becomes 0.05 KHz. Further, the ATIP decoding means 13 FM demodulates the high-frequency tracking error signal output from the reproduction amplifier, decodes the ATIP code, and supplies the decoded ATIP code to the system control means 11. The system control means 11 generates a track jump pulse for causing the pickup 8 to access a predetermined address in accordance with the recording preparation command, and receives a decoded ATI that indicates that the pickup 16 has accessed the predetermined address.
The P code is detected by referring to it, and a recording command is supplied to the address generating means 4, the block encoding means 8, the CD-DA encoding means 9, and the head drive means 10, respectively, and one data block of stored data is read out at high speed. Long minutes are recorded intermittently. Further, the mode setting means 7 is provided with at least an OFF button to turn off the power, an ON/STOP operation button that also functions to turn on and stop the power, and a REC button to set recording. The operation output is transmitted to the system control means 11 and the power supply control means 6.
This is what you input.

In this embodiment, when a recording operation is performed from a power-off state, the compressed audio data during the startup period of the recording mechanism is stored in the memory, the compressed audio data is recorded immediately after the recording operation, and the compressed audio data is recorded immediately after the power is turned on. With the compressed audio data stored, the recording mechanism is activated in conjunction with the recording operation to record the compressed audio data after the recording operation or from a certain period of time before the recording operation.

Therefore, the power supply control means 6 is configured as shown in FIG.
As shown in the table below, when the OFF button is operated, the power supply is stopped, when the ON/STOP button is operated, power is supplied only to the data compression storage means, and when the REC button is operated, the data is compressed. Power is supplied to both the storage means and the recording mechanism.

Further, the address generating means 4 is constituted by microcomputer software, and as shown in the functional block diagram of FIG. The generating means 4A and the read address generating means 4C are reset and initialized.

The initialized write address generating means 4A counts the low-speed clock generated by the clock generating means 4B immediately after power is turned on, updates the write address in order from the initial address, and stores the compressed audio data in the memory 3. be memorized sequentially.

On the other hand, when the REC button is pressed and the recording mechanism is powered on at the same time when the power is turned off, the initialized read address generation means 4C is activated when the recording mechanism reaches a recordable state. In synchronization with the recording command issued to
The clock generating means 4B counts the high speed clocks generated and generates a read address for reading out stored data in units of data blocks at high speed from the initial address. As a result, it becomes possible to record audio from the time of the recording operation.

Next, when the REC button is pressed while the ON/STOP button is pressed and the data compression storage means is in the driving state, the latch pulse generation means 4H activates the data latch means in conjunction with the recording mode setting output. A first latch pulse is supplied to 4E to latch the write address. The latch data is supplied to constant subtraction means 4G and subtracted by a constant number. The data selection means 4F inputs latch data and subtraction data, and according to the setting output from the recording mode setting means 4I, which can be set to two positions, retroactive recording side and normal recording side.
The input data is selected and the selected data is supplied to the read address generation means 4C. The supplied data is latched by the read address generating means 4C by a second latch pulse generated by the latch pulse generating means 4H. When the read address generating means 4C receives a recording command from the recording mechanism, it generates a read address having the preset data as a starting address, and reads the stored data from the memory 3 at high speed according to the selected mode.

As a result, the read address generating means 4C:
When the recording mode is set to retroactive recording, specify an address to retroactively read the stored data for a certain period of time before the recording operation, and when the recording mode is set to normal recording, specify the address to read out the stored data for a certain period of time before the recording operation. Specifies an address to retroactively read out the stored data.

Further, the data amount detection means 5 issues a recording preparation command to the recording mechanism when the difference between the write address and the read address becomes one data block length or more.
The recording mechanism receives this recording preparation command, accesses the pickup to the writing start position, and records the ATIP at the target position.
At the time when a code is detected, a recording command is also supplied to this address generating means 4, so that a recording command will not be issued in a state where sufficient storage data is not stored.

Further, in this embodiment, the recording operation was performed with the recording mechanism in the deactivated state, and the compressed audio data was recorded backwards, but the activation period of the recording mechanism was long and the memory capacity was relatively small. In such cases, it is expected that sufficient retrospective time will not be secured. Therefore, if you want to ensure a sufficient look-back period even at the expense of battery consumption, you can set the recording mechanism in stop mode and enter the recording standby mode to quickly start writing in conjunction with the recording operation. It becomes possible to do so.

[0020]

Therefore, according to the present invention, even if the recording mechanism is started in a state where it is not in operation, the sound at or before the recording operation can be stored, and the effect is great.

[Brief explanation of drawings]

FIG. 1 is an overall circuit block diagram of this embodiment.

FIG. 2 is an explanatory diagram of the data processing principle of this embodiment.

FIG. 3 is a functional block diagram of main parts of this embodiment.

FIG. 4 is an explanatory diagram of mode switching in this embodiment.

[Explanation of symbols]

D Disc record 3. Memory 4 Address generation means 5 Data amount detection means 6 Power supply control means 7 Mode setting means

Claims (3)

[Claims] 1. A storage means for compressing audio data and sequentially updating and storing the data in accordance with a write address in conjunction with a recording operation, and reading out the stored data in a predetermined amount at a high speed in accordance with a read address; A recording mechanism that intermittently records read data from the storage means on a disk in blocks after being activated and becomes ready for recording, and a recording mechanism that generates a write address in accordance with the recording operation and starts recording of the recording mechanism. An intermittent recording device for compressed audio data, comprising address generating means for generating read addresses in accordance with timing. 2. A storage means for compressing audio data and sequentially updating and storing it according to a write address, and reading out a predetermined amount of stored data at high speed according to a read address, and a storage means that is activated in conjunction with a recording operation and becomes in a recordable state. a recording mechanism that intermittently records the read data from the storage means on the disk in block units; An intermittent recording device for compressed audio data, comprising address generating means for forming a read address based on the read start address in synchronization with recording start timing. 3. A storage means for compressing audio data and sequentially updating and storing it according to a write address, and reading out a predetermined amount of stored data at high speed according to a read address, and a storage means that is activated in conjunction with a recording operation and becomes in a recordable state. a recording mechanism that intermittently records the read data from the storage means on the disk in block units after the recording operation, and a recording mechanism that latches a write address corresponding to the operation timing in conjunction with the recording operation, and synchronizes it with the recording start timing of the recording mechanism. and address generating means for intermittently generating a high-speed read address using a latched write address as a read start address.