JP2553516B2 - Information recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording / reproducing apparatus for recording / reproducing information, particularly music signals.

2. Description of the Related Art In recent years, optical discs that record and reproduce information digitally by using light have attracted attention. Some optical discs use various principles, and one of rewritable ones uses a magneto-optical effect. This utilizes the property that the coercive force becomes almost zero when the recording medium is heated above the Curie temperature by a laser beam or the like, and the magnetization is reversed by a small external magnetic field for recording. It uses the Kerr effect that the plane of polarization rotates.

By the way, when recording and reproducing information on a magneto-optical disk, if the recorded position of the information to be reproduced is unknown, it takes a lot of time to reproduce, which is very inconvenient. Such a problem is not limited to the magneto-optical disk but generally exists in an apparatus for recording / reproducing information. In order to solve this, it is sufficient to prepare a table indicating the position of information recorded in advance, the amount of information, and the like, and refer to this to reproduce the information. Such a table is used in a magnetic disk device or the like.

Problems to be Solved by the Invention However, when a music signal is handled as information, special handling is required. That is, for information handled by a magnetic disk or the like, a table may be created with one unit of information to be recorded at the same time, whereas the information recorded at the same time is not necessarily one unit because there is a unit of music signal. There are cases. In other words, when several songs are recorded at one time, there is a problem that it is not possible to reproduce each song unless a table is created for each song.

In view of the above problems, when recording a music signal, the present invention automatically creates a table indicating the position of the song on the disc, the length of the song, etc. at the time of recording, and refers to this table for each song. An information recording / reproducing apparatus capable of reproducing is provided.

Means for Solving the Problems To achieve this object, an information recording / reproducing apparatus of the present invention is a recording medium for recording a music signal forming a music piece, and recording, reproducing, and erasing the music signal on the recording medium. Recording / reproducing means for performing the above, a music interval detecting means for detecting a music interval of a music signal, and a table creating means for creating a table indicating a recording position and a recording time of the music on the recording medium from the output of the music interval detecting means. A recording means for recording the created table on a recording medium; and a special reproduction means for controlling the recording / reproduction means by referring to the contents of the table, and a control means for controlling the device by the output of the inter-track detection means. It is equipped with it.

According to the present invention having the above-described configuration, the input music signal is recorded on the recording medium by the recording / reproducing means at the time of recording, and the music interval is detected by the music interval detecting means and transmitted to the control means, and detected at the time of reproduction. The control means controls the recording / reproducing means in accordance with the tunes and reproduces from the recording medium in a predetermined tune order so that the tunes can be reproduced in any case, which is suitable for recording / reproducing a music signal. It becomes an information recording / reproducing device.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, 1 is a magneto-optical disk for recording information by changing the magnetization direction, and 2 is a magneto-optical disk 1.
Optical head for recording, reproducing, and erasing information for 3
Is an optical head control circuit for controlling the optical head 2, 4 is a bias coil for applying a bias magnetic field to the magneto-optical disk 1 at the time of recording and erasing, and 5 is an input audio signal.
An analog / digital converter for converting bit-parallel digital signals, 6 records the digital signal from the analog / digital converter 5 on the magneto-optical disk 1 as a signal equivalent to an optical read-only audio disk (hereinafter abbreviated as CD). A CD encoder for performing conversion for inputting to the optical head control circuit 3, 7 is a CD decoder for converting the signal from the optical head control circuit 3 into a 16-bit parallel digital signal, and 8 is a digital signal from the CD decoder 7. A digital / analog converter for converting into a signal, 9 is a keyboard for inputting a control signal for operating the information recording / reproducing apparatus having the above-mentioned configuration, and 10 is a music by the output of the analog / digital converter 5 and the output of the keyboard 9. An inter-track detector for detecting the interval, 11 is an optical head control circuit 3, a CD encoder 6, a CD Coder 7, keyboard 9, a control circuit for controlling the device by the output of the music between the detector 10. In this embodiment, the optical head 2 and the bias coil 4 are not shown as a head block in the figure, but are fixed on a base that can be moved in the radial direction of the magneto-optical disk 1. Further, it is provided with a rotating mechanism for the magneto-optical disk 1 and a control circuit therefor.

FIG. 2 is a block diagram showing the structure of the inter-track detector of this embodiment. In FIG. 2, 12 is a 16-bit parallel digital signal from the analog / digital converter 5 and a predetermined signal.
A digital comparator for comparing with 16-bit digital data, 13 is a counter for clearing, starting and stopping the count by the output of the digital comparator 12 and measuring a predetermined time, 14 is an operation for interrupting the recording by the output of the keyboard 9. An operation detector 15 for detecting the signal, and a logical sum circuit 15 for outputting an inter-track signal by the outputs of the counter 13 and the operation detector 14.

The operation of recording / reproducing a music signal in the information recording / reproducing apparatus configured as described above will be described with reference to FIG.

First, in the recording operation, the head block is moved to a predetermined position by the control circuit 11, the magneto-optical disk 1 is rotated at a predetermined speed, a current is passed through the bias coil 4, and a bias magnetic field is applied to the magneto-optical disk 1. Here, when a signal according to the inputted music signal is inputted to the optical head control circuit 3 through the analog / digital converter 5 and the CD encoder 6, the laser light focused on the recording surface of the magneto-optical disc 1 is generated. A music signal is modulated and recorded on the magneto-optical disk 1 by reversing the magnetization.

Next, in the reproducing operation, the position of the head block and the rotation speed of the magneto-optical disk 1 are controlled in the same manner as in the recording operation. When the recording surface of the magneto-optical disk 1 is irradiated with laser light with a constant intensity, recording is performed. The polarization plane of the laser light reflected by the magnetization reversal rotates. The rotation of the polarization plane is converted into a voltage change by the optical head control circuit 3 and output as a music signal through the CD decoder 7 and the digital / analog converter 8.

Next, the operation of detecting the music interval will be described with reference to FIGS. 1 and 2. During the recording operation, the music signal is output from the analog / digital converter 5 as 16-bit digital data.
This 16-bit digital data is designated as A. A is input to the digital comparator 12 of the inter-track detector 10 and compared with a predetermined reference value R of 16-bit digital data. Here, the digital comparator 12 outputs a logic "0" to the counter 13 when A is larger than R and a logic "1" when A is smaller than R.

The counter 13 is reset when the output of the digital comparator 12 is logic "0", but starts counting when the output becomes logic "1". When this count exceeds a predetermined value, a logical "1" is output to the OR circuit 15. That is, when the silent portion of the recorded music signal continues for a certain time or longer, a logical "1" is output.

Further, the operation detector 14 outputs a logical "1" to the logical sum circuit 15 when an operation for temporarily suspending recording is performed. Ie stop,
When a pause or other operation is performed, a logic "1" is output. The logical sum circuit 15 outputs a logical "1" to the control circuit 11 as the inter-track detection signal when at least one of the inputs becomes a logical "1".

The control circuit 11 automatically creates a table indicating the recording position and recording time of the music by using the inter-track detection signal by the table creation function. At the time of reproduction, the control circuit 11 refers to this table by the special reproduction function, and enables special reproduction such as changing the reproduction order in song units and repeating. Further, the magneto-optical recording / reproducing apparatus of this embodiment has a table recording / reproducing function for the magneto-optical disk 1 of the table. This is for recording and reproducing the contents of the table as 16-bit digital data instead of the music signal. The CD encoder 6 of FIG.
It is realized by giving and recording the contents of the table as the input of, and reproducing the contents of the table as the output of the CD decoder 7.

As described above, according to the present embodiment, by detecting the silent portion of the recorded music signal and temporarily suspending the recording, a table automatically indicating the recording position and the storage time of the music is created,
Since recording / reproduction of this table is performed, reproduction can be performed in song units in any case.

In this embodiment, the structure of the signal recorded on the magneto-optical disk is the same as that of the CD, but other structures may be used. In this case, the CD encoder 6 and the CD decoder 7 in FIG. 1 vary depending on the signal structure. Further, the inter-track detector 10 may be any one that correctly detects the inter-track regardless of the configuration of this embodiment. The medium for recording / reproducing a music signal is not limited to this as long as it can record / reproduce information as well as a magneto-optical disc.

As described above, according to the present invention, a recording medium for recording a music signal forming a song, a recording / reproducing means for recording, reproducing, and erasing the music signal on the recording medium, and a space between the songs of the music signal are provided. A music piece detecting means for detecting, a table creating means for creating a table indicating a recording position and a recording time of the music piece on a recording medium, and a table recording for recording the created table on a recording medium. Means and special reproduction means for controlling the recording / reproduction means by referring to the contents of the table,
A control means for controlling the device by the output of the inter-track detection means is provided, and at the time of recording, the input music signal is stored in the recording medium by the recording / reproducing means, and the inter-track detection means
The control means controls the recording / reproducing means according to the detected music interval and reproduces in a predetermined music order in accordance with the detected music interval. This makes it possible to reproduce, and realizes an information recording / reproducing apparatus suitable for recording / reproducing a music signal.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an information recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of the inter-track detector. 1 ... Magneto-optical disk, 2 ... Optical head, 3 ... Optical head control circuit, 4 ... Bias coil, 5 ... Analog / digital converter, 6 ... CD encoder, 7 ... CD
Decoder, 8 ... Digital / analog converter, 9 ...
Keyboard, 10 ... Song detector, 11 ... Control circuit, 12 ...
… Digital comparator, 13 …… Counter, 14 …… Operation detector, 15 …… OR circuit.

Claims (4)

(57) [Claims] 1. A recording medium for recording a music signal forming a music piece, and recording, reproducing, of the music signal on the recording medium.
Recording / reproducing means for erasing, music interval detecting means for detecting the music interval of the music signal, and table creation for creating a table indicating the recording position and recording time of the music on the recording medium from the output of the music interval detecting means. An information recording / reproducing apparatus comprising means, table recording means for recording the created table on the recording medium, and special reproduction means for controlling the recording / reproducing means by referring to the contents of the table. 2. The inter-track detection means outputs a logic 1 when the music signal is below a predetermined level, and a logic 1 when the output of the level comparison means is a logic 1 for a predetermined time or longer. Counter means for outputting, operation detecting means for outputting logic 1 when an operation key having a function of temporarily suspending recording is operated, and logic for outputting a logical sum of the output of the counter means and the output of the operation detecting means. The information recording / reproducing apparatus according to claim 1, wherein the information recording / reproducing apparatus is constituted by summing means. 3. A recording / reproducing means for recording, reproducing and erasing digital information on a recording medium, and an analog / analog converting means for converting an analog music signal into a digital signal.
The digital converting means, the encoding means for converting the digital signal from the analog / digital converting means into a predetermined data format to be recorded on the recording medium, and outputting to the recording / reproducing means, and the recording / reproducing means for the recording medium. A decoding means for converting a predetermined data format reproduced from a digital signal into a digital signal, and a digital / analog converting means for converting the digital signal output by the decoding means into an analog music signal. An information recording / reproducing apparatus as set forth in claim 1. 4. The recording medium is a magneto-optical disk, and the recording / reproducing means includes an optical head for recording, reproducing, and erasing information on the magneto-optical disk, and an optical head control means for controlling the optical head. 4. The information recording / reproducing apparatus according to claim 3, comprising a bias coil for applying a bias magnetic field to the magneto-optical disk.