JPH0298887A - Sound recording level setting method - Google Patents

Abstract

PURPOSE:To excellently set a sound recording level in a short time by changing the number of jumping tracks in a jumping operation according to the playing time of each music, and obtaining the prescribed number of sampled values or more at every music. CONSTITUTION:RF (high frequency) signals supplies to an EMF demodulating circuit 9 after the amplification by means of an RF amplifier 8 form digital data and a sub-code including the audio information of both right and left channels by an EFM demodulating processing after slicing. The sub-code outputted from the EMF demodulating circuit 9 issues instruction signals such as playing, searching and jumping to a performance part control circuit 5 based on the arithmetic operation of a system controller 7, and supplies a control signal (b) and a peak value data (d) to be sent to a tape recorder B to a control output terminal. Thus, since the required prescribed number of sampled values or more can be obtained at every music, the sampling of the peak level is not excessively executed, and the excellent sound recording level can be set in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a recording level setting method, and in particular to a method for setting a recording level, in particular when a signal recorded on a digital audio disk (hereinafter referred to as a disk) called a CD is transferred to another medium such as a magnetic tape. This invention relates to a recording level setting method when re-recording on a recording medium.

BACKGROUND ART A conventional recording level setting method detects the peak level of an audio signal obtained by playing a disc at predetermined time intervals, for example, every few seconds, from the beginning to the end, and then detects the difference between the detected peak level and a predetermined reference level. A method of setting the amplification factor of a variable gain amplifier that amplifies the audio signal obtained from the disc was proposed in 1986-626.
It is disclosed in No. 82. In this conventional method,
A jump operation for a predetermined number of tracks and a play operation for several seconds are performed alternately, the peak level of the audio signal obtained during the play operation is sampled, and the recording level is set based on the obtained sample value. It is.

In such conventional methods, when multiple songs are recorded on a disc, if the number of jump tracks is large, it is not possible to sufficiently sample the peak level of songs with short playing times. Since it is not possible to set the recording level satisfactorily, there is a problem in that if the number of jump tracks is reduced, the time required to set the recording level becomes longer.

Summary of the Invention The present invention has been made in view of the above points, and includes:
To provide a recording level setting method capable of appropriately setting a recording level in a short time when re-recording a plurality of songs recorded on a disc.

In the recording level setting method according to the present invention, when obtaining a sample value by causing the disc performance device to alternately perform a play operation and a jump operation, and sampling the peak level of the audio signal obtained from the disc during each play operation, Increased number of jump tracks in jump action to 3
At least a predetermined number of sample values are obtained for each song by changing the sample values according to the playing time of the song.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In Figure 1, a disc 1 on which multiple songs are recorded
is rotationally driven by a spindle motor 2. As the disk 1 rotates, signals recorded on the disk 1 are read by a pickup 3. The pickup 3 is carried by a carriage (not shown) that moves in the radial direction of the disk 1 by a carriage motor 4, and the information reading point (information reading destination spot) of the pickup 3 is freely positioned in the radial direction of the disk 1. Ru. Further, various servo systems such as a spindle servo system, a focus servo system, a tracking servo system, and a carriage servo system are provided, but they are not shown because they are already well known.

The spindle motor 2 and the carriage motor 4 are connected to a spindle servo system, a carriage servo system, or a performance section control circuit 5.
driven by. The performance section control circuit 5 is configured to drive the spindle motor 2 and the carriage motor 4 and perform on/off control of the various servo systems (not shown) in response to commands from the system controller 7.

So-called RF (high frequency) output from pickup 3
The signal is amplified by an RF amplifier 8 and then supplied to an EFM demodulation circuit 9.The EFM demodulation circuit 9 performs EFM demodulation processing on the pulse signal obtained by slicing the RF multiplied signal to generate PCM data, that is, time division multiplexed. The configuration is such that digital data and subcodes including audio information for both left and right channels are formed. This EFMt
Digital data including audio information output from the 11 tone circuit 9 is supplied to a deinterleaving/interpolation circuit 10. The deinterleaving/interpolation circuit 10 includes RA,
In collaboration with Mll, the digital data whose order has been rearranged by interleaving performed during recording is restored to its original state and sent to the error correction circuit 12, and a signal indicating that correction is impossible is output from the error correction circuit 12. The error correction circuit 12 is configured to interpolate error data in the output data by an average value interpolation method or the like. Further, the error correction circuit 12 uses CI RC (Cross Ititer).
The circuit is configured to perform error correction according to the following code (leave Reed 5 oloson code) and supply digital data to the deinterleaving/error correction circuit 10, and to output a signal indicating that correction is not possible when correction is not possible.

The output data of the deinterleaving/interpolation circuit 10 is D/
A (digital/analog) conversion circuit 13 and peak value detection circuit 14 are supplied. The peak value detection circuit 14 detects the values of a plurality of data sequentially supplied over a period in which the detection command signal p is continuously present in response to the detection command signal p output from the system controller 7, for example. Configured to retain and output maximum data. The output data q of this peak value detection circuit 14 is supplied to the system controller 7. Further, the D/A conversion circuit 13 has a demultiplexer that separates digital data including time-division multiplexed left and right channel audio information for each channel, so that the left and right channel audio signals eL and eR are will be played. The reproduced audio signals el and eR of both left and right channels are LPF
After unnecessary components are removed by (low-pass filters) 15 and 16, the signal is supplied to the audio output terminal of the disc player A.

On the other hand, the subcode output from the EFM demodulation circuit 9 is
The signal is supplied to the system controller 7.

The system controller 7 includes, for example, a processor, a ROM
, , RAM, timer, etc., and the ROM, ROM, After performing arithmetic operations based on data or programs stored in a RAM or the like, it supplies command signals such as play, search, and jump to the performance section control circuit 5, and control signals that are sent to the tape recorder B. and peak value data d are supplied to the control output terminal.

The audio signal e L + e R supplied to the audio output terminal of the disc player A is supplied to the electronic or mechanical volume 21.22 via the audio input terminal of the tape recorder B.

Furthermore, the control signal and peak value data d supplied to the control output terminal of the disc player A are as follows:
The signals are supplied to a system controller 23 and a comparison circuit 24 in tape recorder B, respectively. The system controller 23 is configured to send out a recording level setting command signal a in response to data supplied in response to a key operation on an operation unit (not shown), and send out a comparison command signal C in response to a control signal. It is configured. The comparison command signal C output from the system controller 23 is transmitted to the comparison circuit 24.
supplied to

The comparison circuit 24 is supplied with reference level data f output from the reference level generation circuit 25.

The reference level generation circuit 25 is configured to generate digital or analog data corresponding to a reference level designated by manual operation. In the comparator circuit 24, an output g consisting of a digital or analog signal corresponding to the difference between the output f of the reference level generating circuit 25 and the peak value data d is generated, and is supplied to the volumes 21 and 22.

Volumes 21 and 22 are, for example, the output g of the comparator circuit 24.
The audio signals eL and eR are attenuated at an attenuation rate according to the level of the audio signals eL and eR. These volumes 21.
The output of 22 is applied to a recording head 28, 29 via a recording amplifier 26, 27, and an audio signal eL+eR is recorded on a tape (not shown).

The operation of the processor in the system controller 7 of the disc player A with the above configuration will be explained with reference to the flowchart shown in FIG.

Recording level setting command signal a during execution of main routine etc.
is output, the processor moves to step SO and reads the TOC (Table or Content) recorded as a subcode in the area located on the inner circumference of the disk 1.
nts) has already been read. When it is determined in step SO that the TOC data has not been read yet, the processor moves to step S1 and sends a play command signal to the performance section control circuit 5 to start reading information recorded on the disc 1, Import TOC data. Next, the processor detects the total performance time based on the captured TOC and calculates the total performance time.
Step S2) to calculate the number of tracks N, predict the number n of tracks of the famous song based on the calculated total number N and the performance time of the famous song Step S3), based on the predicted number n of tracks of the famous song and the predetermined number of detections. The number of jump tracks of famous songs is calculated and stored in a predetermined area of RAM (step S4
). If it is determined in step SO that the TOC data has already been read, the processor immediately proceeds to step S2 and calculates the total number of tracks N.

After executing step S4, the processor sets the count value i for detecting the number of songs to 1, and sets the "=1 value for detecting the same number of jumps" to 0, and stores it in a predetermined location of RAh 10. (Step S5).

Next, the processor searches for the number 1 song [step S6] and starts the timer (step S7).
), sends a play command to the performance section control circuit 5, and sends a detection command signal p to the peak detection Iff circuit 14 (
Step S8). Next, the processor uses a timer to determine whether a predetermined time has elapsed after the start of the performance (step S9).

If it is determined in step S9 that the predetermined time has not elapsed since the start of the performance, the processor returns to step S8.
to move to. When it is determined in step S9 that a predetermined time has elapsed after the start of the C performance, the processor stops sending out the detection command signal p, and converts the output of the peak value detection circuit 14 to the classified sample value ω. Then, a command to jump the number of jump tracks calculated in step S4 is sent to the performance section control circuit 5 (step 511). Next, the processor adds 1 to the count value j (step 512), and determines whether j is greater than or equal to j (step 813).

When it is determined in step S13 that j is not more than 10, the processor moves to step S7 again. When it is determined in step Sl' that the count value i has exceeded the total number of times M, the processor determines whether or not the count value i has reached the total number M or more (step 514). If it is determined in step S14 that the count value i is not greater than or equal to the total number of songs M, the processor adds 1 to i by m1.
．． ．． ．． ．． (Step $15), the process returns to step S6. In step 81'4, the count value i is the total number of songs N1.
If it is determined that the above is the case, the processor calculates the average value X of the sample values using the following formula (step 51).
6), send the data indicating the obtained value as sample value data d together with the control number i]7 (step 51
7) Resume execution of the routine that was being executed immediately before proceeding to step SO.

MA n”1 Here, Δn is the frequency of the sample value (class value) un.

In steps 87 to SIO in the above operation, a play operation is performed for a predetermined period of time, and the peak value of the reproduced audio signal is sampled, and the obtained peak value is classified into sample values ω. and [, are stored in a predetermined area of RAM in the system controller 7. Then, step S7 is performed by steps 311 to 813.
~ According to SIO →)'' Play operation for combining and jump operation for the number of jump tracks set according to the playing time of each song are performed once for each song, and in steps S14 and S15, the play operation for the The movement and the jump movement are repeated NIK times over the entire area where the audio signal is recorded on disk 1. Therefore, if the peak level of a song with a short playing time is sufficiently sampled, Sampling of the peak level of a song with a long playing time is not performed more than necessary.

In this way, through steps 57 to S15, peak values of hl are obtained and the sample values ω are classified into classes. The data will be stored in a predetermined area of RAM. This sample value ω. The average value X is calculated in step 51.6, and sample value data d indicating the average value X is supplied to the comparison circuit 24 in step S17.

Here, the data f output from the reference level generation circuit 25 is data indicating an optimal recording level that is artificially set in advance, and the signal g corresponding to the difference between this and the peak value data d is Since the signal levels of the audio signals eL and ep from the disc player side are controlled, the average value of the peak values of the audio signals obtained from disc 1 is artificially set to optimal recording. The signal level of the audio signal is automatically controlled to be equal to the level.

In the above embodiment, one novel to be recorded is set by controlling the gain on the tape recorder side, but one novel to be recorded may be set by controlling the gain on the disk player side. Furthermore, in the case of using a disc player, there are two methods: a method of changing digital data and a method of changing analog audio, and either method may be used.

Although the case where the disc playing device and the recording device are separated from each other has been described above, the present invention can also be applied to a case where the disc playing device and the recording device are integrated.

Effects of the Invention As detailed above, in the recording level setting method according to the present invention, the disc playing device alternately performs the play operation and the jump operation, and samples the peak level of the audio signal obtained from the disc during each play operation. When obtaining sample values, the number of jump tracks in the jump operation is varied according to the playing time of the six songs, so that at least a predetermined number of sample values are obtained for each song. The level is sufficiently sampled, and the peak level of a song with a long playing time is not sampled more than necessary.
This allows you to set a good recording level in a short time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of a processor in the device shown in FIG. Explanation of symbols of main parts 1...Disk 7...System controller 14...Peak value detection circuit 21.22...Volume 24...・Comparison circuit applicant Pioneer Corporation

Claims (1)

[Claims] When a plurality of songs recorded on the recording disk are played back and recorded on the recording medium by a disk playing device that plays the recording disk and a recording device that records signals on a predetermined recording medium, the disk playing device The gain of the amplification stage of the disk playing device or the recording device is determined according to the sample value obtained by sampling the peak level of the signal obtained from the disk during each play operation by alternately performing play operations and jump operations. A recording level setting method for setting a recording level by controlling the
A recording level setting method characterized in that the number of jump tracks in the jump operation is varied according to the performance time of each song to obtain at least a predetermined number or more sample values for each song.