JP2611959B2 - Optical disk recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus, and more particularly to a method for assigning a track number to an accurate position of a signal block.

[0002]

2. Description of the Related Art When recording on a recordable CD optical disc compatible with a read-only CD, the inner circumference of the optical disc is
An empty area is reserved for recording TOC (table of content) later, and the recording signal is recorded from the outside to the outer periphery. For example, in the case of recording a musical tone signal of music, while monitoring a music signal to be recorded by an operator, when an operator tries to change a track number during a song (mute state) or a track number, By pressing the operation key to increment
At the time of pressing, recording was being performed with a new track number.

[0003] In this way, each track is recorded,
When recording reaches a predetermined outer peripheral position of the optical disc,
Alternatively, when it is determined that no more music signals are to be transmitted to the optical disc, the optical pickup is moved to the TOC area on the inner circumference of the optical disc, and the table of contents information of the music recorded so far is recorded in this TOC area. A recordable CD has been completed as a recordable disc.

[0004]

However, if the interval between songs (mute state) is sufficiently long, there is no problem if the timing of pressing the operation key for incrementing the track number is slightly shifted, but it is not a problem. Is very short, there is a disadvantage that the switching position of the track number is temporally shifted at the timing of pressing the operation key, and the switching is not performed at the operator's intention. for that reason,
When a search is made to the start position of a track and reproduced later, there is a serious problem that the sound at the beginning of the song is lost.

According to the present invention, in a device for recording a signal having a table of contents on an optical disk, a memory for temporarily storing an input signal and a predetermined input signal level indicating that the input signal has been completed are obtained. First detecting means for detecting time and obtaining time information, and second detecting means for detecting that a predetermined input signal level indicating that signal input has been started and obtaining time information, When a signal stored in the memory is read out and recorded on an optical disk, a time interval between the end position of the previously input signal and the start position of the next input signal based on the time information detected by the first and second detecting means. An optical disk recording apparatus comprising means for changing the track number for recording on the optical disk, and means for recording the track number on the optical disk as table of contents information.

[0006]

Therefore, during the recording of the recording signal on the optical disk, especially when the track number is incremented when the interval between the recording signals (mute section) is short, the first means for detecting a predetermined output level of the input signal to be recorded is muted. The end of mute is detected by the second means for detecting the start and then detecting a predetermined output level from this detection, and recording is performed at the time position between the first and second output level detections. Track number is incremented and recorded.
Even when the interval between recording signals is short, the track number can be changed at a time position intended by the operator.

[0007]

FIG. 1 is a block diagram showing an embodiment of an optical disk recording / reproducing apparatus capable of additionally recording according to the present invention. In the figure, an optical disk 1 is CLV driven by a spindle motor 2.
It is controlled to provide the required speed. Information recorded on the optical disk 1 is read by the optical pickup 3,
EFM via the head amplifier 4 and the HF signal detection circuit 5
The signal is applied to the demodulation circuit 6. The output of the EFM demodulation circuit 6 is
The music signal is applied to the system control unit 8 via the subcode extraction circuit 7 and demodulated via the demodulation circuit 9, and is output to the output terminal 10.

The EFM modulation circuit 11 converts a subcode signal from the system control unit 8 into a subcode insertion circuit 12.
And a recording signal from a recording information input terminal 13 is applied via an A / D converter 14 and a modulation signal processing circuit 15. The output of the EFM modulation circuit 11 is applied to a laser modulation circuit 16, and the output of the laser modulation circuit 16 is applied to the optical pickup 3. The slide control signal from the system control unit 8 is a slide drive 17
Is applied to the slide device 18 via the. The optical pickup position detection output from the slide device 18 and the detection output of the loading of the optical disk 1 from the optical disk sensor 19 are applied to the system control unit 8, respectively.

In addition to the above-described conventional configuration, a read address counter 21 for writing or reading from a memory circuit 20 for storing recording data between a modulation signal processing circuit 15 and an A / D converter 14 is provided. An address counter 22 is provided. In addition, a first level detection circuit 23 for detecting a predetermined level of the recording data, and a second level detection circuit 24 are also provided.

FIG. 2 is a timing chart at the time of recording according to the present invention. The horizontal axis is time, and the vertical axis of the waveform is
The output level is shown and the center is the mute level. The timing TM1 is the input signal waveform to be recorded in FIG. The timing TM2 is a signal waveform immediately before recording on the optical disk in FIG. At the timing TM1, it is assumed that the section A is in a state where almost no signal is input (mute state).

The operator of the device is recording the Nth,
Next, the operation in the case where the section after the section A is switched to the (N + 1) th will be described. Returning to FIG. 1, when recording the N-th data, the recording signal is temporarily stored in the write address counter 2.
After the data is stored in the above-mentioned memory circuit 20 by using the read address counter 2 and read out from the memory circuit 20 by using the read address counter 21 when actually recording the data on the optical disk 1, the modulation signal processing circuit 15 and the EFM modulation 11 , Laser modulation circuit 16
From the optical pickup 3 to the optical pickup 3.

At this time, the subcode is stored in the system control circuit 8
, A sub-code indicating the N-th is encoded and recorded together with the recording signal. The important point of the signal flow here is that the actually recorded signal is at the maximum and the recording on the optical disc 1 is delayed by the capacity of the memory circuit 20. Therefore, in FIG. 2, while monitoring the signal near the point P1 and approaching the end of the signal, when the operator issues an information increment command 25, the system control unit 8 executes the first level detection circuit. 23
The operation is performed.

That is, at the timing TM1, the recording on the optical disk 1 is delayed from the input signal. Therefore, it is possible to monitor the level of the input signal from this timing and determine the switching position of the track. The first level detection circuit 23 is an operation for detecting an N-th end, in other words, for detecting a mute start time. Then, the second level detection circuit 24 detects the end of the mute and the start of the signal.

Therefore, in the timing chart of FIG. 2, at the point P1, the first level detection circuit 23 knows the start of the mute, and at the point P2, detects the end of the mute (start of the next signal). Things. However, if the track is switched as the (N + 1) -th track at the point P2, the head of the music may be truncated. In the present invention, the above problem is solved by switching tracks between the timing of the point P1 and the point P2.

This track switching operation is performed by the system control unit 8. That is, the times of the points P1 and P2 are monitored by means such as a timer, and the point P3 at which the track is switched is calculated from the points P1 and P2. In the simplest method, a point P3 can be set at an intermediate position between the elapsed times of the points P1 and P2. If the point P3 can be selected in accordance with the mode of the apparatus or the like, the degree of freedom is further increased and the point P3 becomes better.

After the point P3 is calculated by the system controller 8, the recording signal is read out from the memory circuit 20 and the time at the point b, which is an input signal for recording on the optical disk 1, is set to the time of the point P3. N + 1
Switch to the third track. Therefore, even if the timing at which the operator presses the operation key is slightly shifted, since the input signal is monitored internally, the track shift due to the key input timing shift of the operator does not occur. Further, it is also possible to perform the operation of switching the track as it is when the increment key of the track is input without performing these internal operations.

As a matter of course, there is no time difference between the two waveforms at the entrance and the exit of the memory circuit 20 as shown in FIG. The point P3 calculated earlier is set as P3 'at the timing TM2, the track becomes N + 1 from this time position, and the subcode is encoded with the track incremented.

If the levels of the first level detection circuit 23 and the second level detection circuit 24 can be selected at several levels, track switching can be performed by monitoring the input with higher accuracy.

[0019]

According to the present invention, the input signal level is detected, the end point of the input signal and the start point of the next input signal are obtained, and during that time, the track is switched and the signal is recorded on the optical disk. Even when an input signal having a short silent section is recorded, the silent section can be recorded in a track-by-track manner, and the table of contents information that does not cause head loss when reproduced can be recorded on the optical disc.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an optical disk recording / reproducing apparatus capable of additionally recording according to the present invention.

FIG. 2 shows a timing chart during recording in the present invention.

[Explanation of symbols]

Reference Signs List 1 optical disk 2 spindle motor 3 optical pickup 4 head amplifier 5 HF signal detection circuit 6 EFM demodulation circuit 7 subcode extraction circuit 8 system control unit 9 demodulation circuit 10 output terminal 11 EFM modulation circuit 12 subcode insertion circuit 13 recording information input terminal 14 A / D converter 15 Modulation signal processing circuit 16 Laser modulation circuit 17 Slide drive 18 Slide device 19 Optical disk sensor 20 Memory circuit 21 Read address counter 22 Write address counter 23 First level detection circuit 24 Second level detection circuit 25 Increment Command

Claims (1)

(57) [Claims] 1. An apparatus for recording a signal having table of contents information on an optical disk, comprising: a memory for temporarily storing an input signal; and a memory for storing a predetermined input signal level indicating that the input signal has ended. First to detect and obtain time information
Detection means, second detection means for detecting that the input signal level has reached a predetermined level indicating that the next signal input has started, and obtaining time information, and reading out the signal stored in the memory. When recording on an optical disk, recording is performed by changing the track number between the end position of the previously input signal and the start position of the next input signal according to the time information detected by the first and second detection means. Means for recording the track number as table of contents information on the optical disc.