JPH04254978A - Optical information recorder - Google Patents

Abstract

PURPOSE:To retrieve a music where a truck number exceeds a specified value in the case that a recording medium is reproduced even when the music where the recording track number exceeds the specified value is recorded on the recording medium. CONSTITUTION:This recorder is provided with means 9 and 11 by which the recording track number and a recording index number at every block are changed and set in order in accordance with the track number change requesting signal and the index number, a means 12 by which the track number change requesting signal for is outputted until the recording track number reaches the specified value and after it reaches the specified value the index number change requesting signal is outputted based on an intermusic signal and a means 13 by which a sub-code is generated based on the recording track number and the recording index number.

Description

[Detailed description of the invention]

0001

[Technical Field] The present invention is a method for storing a plurality of songs (a series of information data, not just a song, is referred to as a song), including song number data corresponding to each song, that is, a track number, and one song. The present invention relates to a recording device that records on a recording medium together with identification information including an index number for designating a portion.

0002

[Background technology] A predetermined format signal consisting of a main code that carries multiple songs and subcodes that carry various identification information corresponding to each song is recorded on a recording medium such as a CD or DAT, and then played back. Techniques for doing so are publicly known. This subcode has an 8-bit structure and is P, Q, R, S, T, U,
There are V and W channels. Among these, the P channel represents a break between songs, and is encoded as 1 between songs and 0 within a song. In addition, the Q channel contains song number data indicating the number of the song on the recording medium, that is, track number, and time data indicating the elapsed time for each song and from the beginning of the recording medium, and for one song. It is responsible for the index number to further divide this.

FIG. 1 shows a block diagram of a conventional example. In the figure, from terminal 1, for example, an analog audio signal to be recorded.
The audio signal is input and supplied to the conversion circuit 2. The conversion circuit 2 is composed of an A/D converter, converts the input analog signal into a digital signal (hereinafter simply referred to as an audio signal) to become the main code, and converts the input analog signal into a digital signal (hereinafter simply referred to as an audio signal), which is then sent to the format processing circuit 3.
supply to. The format processing circuit 3 processes the audio signal and subcodes to be described later into a predetermined format, and then supplies them to the EFM modulation circuit 4. The EFM modulation circuit 4 modulates the audio signal including the formatted subcode into an EFM digital signal and supplies this to the recording system 5. The recording system 5 includes a laser element, an optical unit, etc., and records the supplied EFM digital signal on a disk 6, which is an optical information recording medium.

The audio signal output by the conversion circuit 2 is also supplied to a volume detection circuit 7 at the same time, and the volume level of the audio signal is detected. The volume detection circuit 7 further determines whether the volume level of the audio signal has changed below a predetermined value,
When the level changes to a predetermined value or less, an effective level signal is output as an inter-music signal indicating a break between songs, and is supplied to the inter-music detecting circuit 8. When the song interval detection circuit 8 receives the valid level signal, it determines whether it is indeed the beginning of the next song and sends a track number change request signal for the song to be recorded, that is, a song number change request signal to the song number. The signal is supplied to the setting circuit 9, and a song number change command is issued.

The song number setting circuit 9 is configured to set and hold song number data to be recorded, and the song number can be switched by a song number change command from the song interval detection circuit 8. There is. The song number setting circuit 9 subcodes the set song number data.
is applied to the code generation circuit 10. The subcode generation circuit 10 corrects the song number data and generates a new subcode according to the order of the songs input based on the song number change command. The new subcode output from the subcode generation circuit 10 is
As described above, the signal is supplied to the format processing circuit 3, where it is formatted together with the audio signal, and then sent to the EFM modulation circuit 4.
After being subjected to EFM modulation, the signal is recorded on the disk 6. In this way, the recording signal recorded on the disc 6 has song number data according to the order of the songs to be recorded based on the input signal.

FIG. 2 is a flowchart showing the subcode generation procedure from the volume detection circuit 7 to the subcode generation circuit 10 in FIG. First, in step S1, the song interval detection circuit 8 determines whether the operation mode is the recording mode. If the operation mode is the recording mode, the volume detection circuit 6 detects the volume level of the audio signal, and then it is determined whether the volume level is equal to or higher than a predetermined level (step S2). Here, a value of -60 dB in volume is adopted as the value of the predetermined level in order to use the volume level of the silent signal as a criterion for discrimination.

[0007] When determining that the volume is below -60 dB, the volume detection circuit 7 supplies an effective level signal to the inter-song detection circuit 8, activates the inter-song timer in the inter-song detection circuit 8, and at the same time It is determined whether or not the inter-song timer has expired, that is, whether a predetermined time set in the inter-song timer has elapsed (step S3). If the predetermined time has not elapsed, the operation procedure moves to step S1 described above. If the predetermined time has elapsed, set the inter-song flag Fmb, that is, set F
After setting mb=1 (step S4), the process moves to step S1.

When it is determined in step S2 that the input signal is not below a predetermined level, the inter-song timer is cleared (step S5), and the inter-song flag Fmb is determined (
Step S6). As a result of the determination, the inter-song flag Fmb is Fm.
If b=1 or set, the inter-song detection circuit 8
clears the inter-music flag Fmb as Fmb=0 (step S7) and supplies a tune number change request signal to the tune number setting circuit 9. Upon receiving this, the song number setting circuit 9 increments the recording track number corresponding to the song number by 1 (step S
8) After outputting new song number data to the subcode generation circuit 9, the process moves to step S1. If the inter-song flag is Fmb=0 in step S6, that is, the inter-song flag is cleared, steps S7 and S8
The program immediately moves to step S1 without changing the song number.

If the recording mode is canceled and it is determined in step S1 that recording is not in progress, the inter-music timer and inter-musical flag Fmb are cleared (steps S9 and S10), and then this flow is ended. The above operation will be explained with reference to the timing chart of FIG. (a) of the figure is a waveform representing the volume level of the input signal, and (b) is a waveform representing the track number synchronized with this input signal. The figure (c) is the same as the inter-song flag Fmb shown in FIG. 2, and the high level of the waveform is represented as "1" and the low level is represented as "0". FIG. 4(d) shows the track number to be recorded, that is, the recording track number set in the song number setting circuit 8.

At time T1, when the volume level of the input signal falls below a predetermined value and a silent portion is detected, the inter-song timer in the inter-song detection circuit 8 starts operating, and at time T2 after a predetermined period of time, the inter-song timer starts operating. The interval flag Fmb becomes 1. Even after the inter-song flag Fmb is set, the volume is detected, and when the input signal reaches the predetermined volume level or higher at time T3, the beginning of the next song has been detected, and the inter-song detection circuit 8 sets the inter-song flag. At the same time as clearing, a song number change request signal is output to the song number setting circuit 9, and the recording track number is incremented.

[0011] The same processing as above should be performed at times T4, T5, and T6, but as shown at time T6, if the input signal to be recorded exceeds 99 songs, the standardized recordable The recording track number cannot be incremented because it would exceed the track number. In other words, even if the beginning of the next song is detected from the silent portion of the input signal, the song number setting circuit 9 no longer has a recordable track number, so the track number is set beyond 99. That is not possible. Therefore, when a recording medium on which 100 or more songs are recorded is played back using a conventional recording device, there is a problem in that it is not possible to identify each song after the 100th song and search between corresponding songs.

0012

[Object of the Invention] Therefore, an object of the present invention is to provide a system for recording songs whose track numbers exceed a predetermined value on a recording medium, but when the recording medium is played back. An object of the present invention is to provide an optical information recording device that enables searching.

[0013]

SUMMARY OF THE INVENTION An optical information recording apparatus according to the present invention includes an inter-song signal generating means for generating an inter-song signal indicating the inter-song interval of songs carried by an input digital signal, and a track number changer based on the inter-song signal. song interval detection means for outputting a request signal;
track number setting means for sequentially changing and setting a recording track number for each block in response to the track number change request signal; and subcode generation means for generating a subcode based on the recording track number. a formatting unit that generates a main code that carries the input digital signal and synthesizes the main code and the subcode to obtain a CD format signal; An optical information recording device comprising a recording means for modulating and recording on a recording medium, and having an index number setting means for sequentially changing and setting a recording index number for each block in response to an index number change request signal. The song interval detection means outputs the index number change request signal based on the song interval signal after the recording track number reaches a predetermined value, and the subcode generation means outputs the index number change request signal based on the song interval signal. and the recording index number.

[0014]

[Operation of the Invention] In the optical information recording device according to the present invention, when the number of songs in the input signal reaches a predetermined value, the recording track number is sequentially switched correspondingly, and when the recording track number exceeds the predetermined value. If so, the recording index number is switched and a subcode is generated based on these recording track numbers and index numbers.

[0015]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 4 is a block diagram of an embodiment of the present invention, in which parts equivalent to those in FIG. 1 are designated by the same reference numerals and perform the same operations. In this embodiment, in addition to the configuration shown in FIG. 1, a sub-track number setting circuit 11 is provided as an index number setting means, and an index number change request signal, that is, a sub-track number change request signal is generated from the song interval detection circuit 12. The sub-track number data can be switched and set in response to the change. Additionally, the song interval detection circuit 12 takes in the current recording track number set in the song number setting circuit 9, compares it with the recordable track number "99", and determines whether the recording track number is 98 or less. If the number exceeds 98, a song number change request signal is supplied to the song number setting circuit 8, and if the number exceeds 98, a sub song number change request signal is supplied to the sub song number setting circuit 11. The sub-code generation circuit 13 generates a sub-code based on the song number data and sub-music number data set in the song number setting circuit 9 and the sub-music number setting circuit 11. The track number and sub-track number data are the so-called track number and index number that carry the Q channel in the sub-code in the standardized CD format.

Similar to FIG. 2, FIG. 5 shows a subcode from the volume detection circuit 6 to the subcode generation circuit 13 in FIG.
3 is a flowchart showing a procedure for generating a code. In the flowchart of FIG. 5 as well, steps that perform the same processing as in FIG. 2 are given the same reference numerals, that is, step numbers, and detailed explanations will be omitted. In this flowchart, when incrementing the recording track number after the inter-song flag is set, the subcode to be recorded according to the currently set recording track number after clearing the inter-song flag is Increment the recording track number or index number inside.

That is, after clearing the inter-track flag in step S7 in FIG. It is determined whether or not it has been reached (step S11). If the recording track number is 98 or less, the recording track number is incremented by 1 in the song number setting circuit 9 in response to the song number change request signal from the song interval detection circuit 12 (step S8
). Then, the recording index number in the sub-track number setting circuit 11 is set to its initial value "01" (
After step S12), the process moves to step S1. Therefore, until the currently set track number is 98, the flow goes through steps S8 and S12.
The recording track number will be changed in accordance with the order of the songs input while the recording index number remains fixed.

On the other hand, if the recording track number has reached 99, the recording track number is not incremented as in step S8, but the sub-track number change signal from the inter-track detection circuit 12 is used in the sub-track number setting circuit. 11, the recording index number is incremented by 1 (step S13), and then the process moves to step S1. Therefore, after the recording track number reaches 99, step S13
The flow goes through , and the recording track number is 99.
The recording index number is incremented in accordance with the order of the songs input as they are.

FIG. 6 shows a timing chart of the subcode generation operation. Figure (a)~
(d) is similar to FIG. 3, respectively (a) input signal, (b
) a track number synchronized with the input signal, (c) an inter-song flag, and (d) a recording track number. In this embodiment, in addition to the recording track number, a recording index number is used as information representing the song interval in the recording information signal, and this is shown in FIG. 3(e).

As explained above with reference to FIG. 5, until time T3, that is, until the current recording track number set in the song number setting circuit 9 is 98, the recording track numbers are sequentially changed according to the song order of the input signal. - is incremented, and the recording index number is fixed at "01". Thereafter, even when the recording track number becomes 99, the inter-track flag is set at time T6, and the beginning of the 100th track is detected, the recording track number in the track number setting circuit 9 does not change. Instead, the song interval detection circuit 12 supplies a sub-track number change request signal to the sub-track number setting circuit 11, so the recording track number remains fixed at 99 and the recording index number changes from "01" to " Incremented to 02''.

In this way, recording track number 100
By incrementing the recording index number for subsequent songs, it is possible to record the song interval or song head information corresponding to the song on the disk 6. Therefore, when playing back a disc recorded in this way, even when playing back songs with track numbers 100 and onwards, each song can be searched by performing an index search.

FIG. 7 is a flowchart showing an example of an operation procedure for searching for a specific piece of music in a reproduced signal when reproducing a recording medium recorded in accordance with the above embodiment. This search routine is extracted from the main routine of an optical information reproducing device (not shown) and is expressed as a subroutine. In the figure, when the playback device moves to the search routine, it first imports the song number, that is, the designated track number TRN, which is set in the system by key input by the user or during normal play or program play (step S101). ), then the value of this designated track number TRN is determined (step S102).

In step S102, if the designated track number TRN is 99 or less, a search operation based on the normal designated track number is performed (step S102).
103), the process moves to the main routine. Specified track number - If TRN is greater than 99, subtract 99 from the track number - TRN and get the index number.
The IDN is determined and the designated track number TRN is set to 99 (step S104).

Then, by performing a search operation for the designated track number 99 (step S105), the position of a pickup such as a disc player is the position of track number 99, that is, the index number of the 100th track or later. The reference point will be reached. Next, a so-called index search is performed based on the index number IDN calculated in step S104 (step S106), and then the process moves to the main routine. Index search here track number
The index numbers after 99 are searched and the position of the information reading point is moved to the position of the index number IDN.

[0025] In this way, the information recording medium recorded according to the present invention can perform normal search by track number and index search by index number on the playback side.
By using this in combination with ``chi'', it is possible to search for the 100th and subsequent recorded songs. In the above embodiment, the recording medium is simply a disk, but the disk may be of any type that can be written (recorded), such as a WO type that can be written only once or an RW type that can be rewritten. Further, without being limited to disks, it is possible to use magnetic recording media such as DAT (digital audio tape).

Furthermore, the input signal to be recorded on the recording medium is
Although the explanation has been made using an analog audio signal, it is not limited to this, and it goes without saying that the same applies to digital input signals that carry other information signals, and in this case, the volume detection circuit 7 Instead of using such means, it is sufficient if there is a means for supplying information indicating the delimitation between each information signal data block in the input signal. For example, a recording device whose input signal is an EFM digital signal and which records it on a recording medium according to the order of the songs is based on Japanese Patent Application No. 2-27
No. 1998, according to which an inter-song signal, which is an inter-block signal of an information signal, is obtained by extracting and decoding a sub-code accompanying an input signal. Thus, it is clear that it is not necessarily necessary to obtain the inter-song signal of the input signal by detecting the volume as in the above embodiment.

[0027]

As explained above, in the optical information recording device according to the present invention, when the number of songs in the input signal reaches a predetermined value, the recording track number is sequentially switched correspondingly, and the recording track number is When the index number reaches a predetermined value that cannot be changed, the recording index number is switched, and these recording track numbers and index numbers are used as subcodes, so each song can be individually recorded on the recording medium. Corresponding respective identification information can be recorded. Therefore, with the recording medium recorded according to the present invention, each song can be searched by performing an index search when reproducing a predetermined number of songs or later.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of a conventional optical information recording device.

FIG. 2 is a flowchart showing the subcode generation operation procedure in FIG. 1;

[Figure 3] Time chart for explaining the recording operation in Figure 1
to.

FIG. 4 is a block diagram showing an example of the configuration of an optical information recording device according to the present invention.

FIG. 5 is a flowchart showing the subcode generation operation procedure in FIG. 4;

[Figure 6] Time chart for explaining the recording operation in Figure 4
to.

FIG. 7 is a flowchart showing a search procedure for a reproducing device that reproduces a recording medium recorded by the recording device according to the present invention.
to.

[Explanation of symbols]

7……Volume detection circuit 9...Track number setting circuit 11... Sub-track number setting circuit 12... Song interval detection circuit 13...Subcode generation circuit

Claims (3)

[Claims] 1. An inter-song signal generating means for generating an inter-song signal indicating the inter-song interval of a song carried by an input digital signal; and an inter-song detecting means for outputting a track number change request signal based on the inter-song signal. , a track number setting means for sequentially changing and setting a recording track number for each block in response to the track number change request signal, and a subcode generating means for generating a subcode based on the recording track number. and generates a main code that carries the input digital signal, and also generates the main code and the sub code.
an optical information recording device comprising: a formatting means for synthesizing a CD format signal to obtain a CD format signal; and a recording means for EFM modulating the CD format signal and recording it on a recording medium, index number setting means for sequentially changing and setting a recording index number for each block in response to an index number change request signal; The index number change request signal is output based on the inter-song signal, and the subcode generation means generates the subcode based on the recording track number and the recording index number. Optical information recording device. Claim 2: The information carried by the input digital signal is
is an audio signal, and the inter-song signal generating means is an audio signal.
2. The optical information recording apparatus according to claim 1, wherein the inter-song signal is output when the volume level of the audio signal is below a predetermined silence level. 3. The inter-music detecting means has a timer means that operates in response to generation of the inter-musical signal and stops in response to disappearance of the inter-musical signal, and the timer means operates in response to generation of the inter-musical signal and stops in response to extinction of the inter-musical signal, and 3. The optical information recording apparatus according to claim 2, wherein the track number change request signal or the index number change request signal is output when the inter-track signal disappears after a lapse of time.