JPS6313168A - Sound recording level setting method for recording signal - Google Patents

Abstract

PURPOSE:To attain the rerecording of a reproduced sound without distortion by digitizing a level information signal in a specific level and setting a sound recording level with the peak level of the level information signal from a disk added to a sound signal. CONSTITUTION:The sound signal (a) and a level information signal (b) whose level is same to the maximum value of the signal level of the sound signal (a) generated by an oscillator 2 are digitized in A/D converters 4 and 5 and the signal (b) is added to the signal (a) in an encoder 7 so as to be recorded in the disk 14. In a disk player sound signal data is separated from level information data in a data separation circuit and they are analogized in D/A converters 33 and 36. In the peak holding circuit 46 of a tape recorder the peak level of the level information signal is held and corresponding voltage is outputted as the control signal of an attenuator 41, so that the signal attenuation amount which is equal to the saturation level of a tape 44 can be set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording signal recording level setting method, and particularly to a C recording level setting method.
This is a recording level setting method when rerecording recorded information on a small digital audio disk (hereinafter referred to as a disk) called a D (compact disk) onto another recording medium such as a magnetic tape.

1. As a recording level setting method, the peak level of the portion of the input signal supplied within a predetermined time from the beginning of the song is held, and the held peak level is the saturation level of the magnetic tape or the A/D in digital audio equipment. A method is known in which the signal level of an input signal is adjusted using an attenuator or the like so that it is equal to the maximum input level of the converter.

When a song recorded on a disk is re-recorded onto a tape using a tape recorder that employs such a conventional recording level setting method, the signal level of the input signal is adjusted after a predetermined period of time has elapsed from the beginning of the input signal. When the peak level of the input signal becomes greater than the peak level of the input signal supplied within a predetermined time after the input signal is input, the recording level exceeds the saturation level of the tape or the maximum input level of the A/D converter, and the recording level exceeds the saturation level of the tape or the maximum input level of the A/D converter. There was a problem that distortion occurred in the reproduced sound.

The present invention has been made to eliminate the drawbacks of the conventional methods as described above, and it is possible to perform good re-recording without causing distortion in the reproduced sound obtained from the tape. The purpose of the present invention is to provide a recording signal recording level setting method that is possible.

The recording signal recording level setting method according to the present invention digitizes a level information signal having the same signal level as the maximum value of the signal level of an audio signal, and adds the level information signal as a subcode to the beginning of the audio signal. Digital
The feature is that the peak level of the level information signal obtained from the digital audio disk is maintained during re-recording, and the recording level of the audio signal is set according to the maintained peak level. It is said that

! -1Jl Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, an audio signal a reproduced from a tape on which a plurality of songs are recorded is supplied to a sample and hold circuit 1. At the same time, the oscillation frequency and output level are adjusted in advance by manual operation or the like so as to generate a level information signal @b of, for example, lKH2, which has a signal level equal to the level when the signal level of the audio signal a reaches its maximum. The output of the oscillator 2 is sent to the sample hold circuit 3.
is supplied to. In the sample and hold circuits 1 and 3, the audio signal a and the level information signal S are each sampled by a sampling pulse of, for example, 44.1KH2, and the instantaneous values of the audio signal a and the level information signal S at the time of generation of the sampling pulse are The level is maintained and output. The outputs of these sample and hold circuits 1 and 3 are supplied to A/D (analog/digital) converters 4 and 5, respectively, and converted into digital data.

The digital data output from the A/D converter 5 is transferred to a CD via an error detection and correction code adding circuit 6 that interleaves the data and adds codes for error detection and correction.
is supplied to the system encoder 7. The CD encoder 7 is also supplied with digital data output from the A/D converter 4 and the output of the control signal generation circuit 8.

The control signal generation circuit 8 generates data indicating the elapsed time since the supply of the audio signal a to the sample hold circuit 1 was started, and data indicating the inter-song portion and mid-song portion of the audio signal being supplied to the terminal IN. etc. is configured to generate. Further, the CD system encoder 7 converts the output of the control signal generation circuit 8 into sub-code P and Q channel data based on the CD system, and converts the output of the error detection and correction circuit 6 into the sub-code, for example, R channel data. The recording signal is added to the digital data from 4 to form a recording signal. This CD
The recording signal output from the system encoder 7 is sent to the modulator 9
EFM (Eight to Fourte)
en Modulation) is converted into a modulation signal.

The output of the converter 39 is supplied to the optical modulator 1o to control the transmittance of the optical modulator 10. As a result, laser light source 1
The laser beam generated in 1 is intensity-modulated by an optical modulator 10, then expanded by a collimator lens 12, and then passed through a converging lens 13.
A light spot of approximately 0.5 μm in diameter is focused onto the recording surface of the master disk 14 to expose the photoresist and the like constituting the recording surface.

On the other hand, the master disk 14 is rotated by a motor 15 and a servo loop (not shown) at a speed that depends on the relative position of the light spot in the radial direction of the master disk 14, and is approximately 1.5 times per rotation in the radial direction. It is transferred at a rate of 6 μm. Further, the converging lens is controlled by a servo loop so as to always converge the laser beam onto the recording surface of the master disk 14. Since these are not particularly necessary for the explanation, they are omitted in this figure.

A disk player that plays back information from the master disc on which information is recorded in this way, or a Ml disk that is transferred to plastic using a mold that is manufactured, and a tape that plays the information played by this disk player. A re-recording device consisting of a tape recorder and a tape recorder for recording will be explained with reference to FIG.

Disk 2 rotationally driven by spindle motor 20
The recorded information of 1 is read by the optical pickup 22. The pickup 22 includes a laser diode, an objective lens, a focus actuator, a tracking actuator, a photodetector, and the like.

The output of the pickup 22 is sent to the focus servo circuit 23.
, a tracking servo circuit 24, and a reproduction clock generation circuit 25 including an RF amplifier.

In the focus servo circuit 23, a focus error signal is generated by, for example, an astigmatism method, and a focus actuator in the pickup 22 is driven in accordance with this error signal. As a result, the laser light emitted from the laser diode and passed through the objective lens is focused on the recording surface of the disk 21 to form a light spot with a diameter of about 1.6 μm. Further, in the tracking servo circuit 24, for example, 3
A tracking error signal is generated by the beam method,
This error signal is sent to the tracking actuator in the pickup 22 and the carriage servo circuit 26. The output of the carriage servo circuit 26 is supplied to a motor M that drives a carriage (not shown) carrying the pickup 22, so that the pickup 22 is sent in the radial direction of the disk 21.

In the reproduced clock generation circuit 25, a reproduced clock signal for demodulation is generated and supplied to the spindle servo circuit 27. In the spindle servo circuit 27, a drive signal corresponding to the phase difference between the reproduced clock and the reference clock from a clock generation circuit (not shown) is generated to drive the spindle motor 20, and the track linear velocity of the disk 21 is kept constant. controlled so that Further, the output of the RF amplifier of the reproduced clock generation circuit 25 is supplied together with the reproduced clock to an EFM demodulation circuit 28 including a frame synchronization circuit. EFM1! The demodulated output of the modulation circuit 28 is supplied to the data separation circuit 29. The data separation circuit 29 is configured to separate the output of the EFM demodulation circuit 28 into audio signal data corresponding to the audio signal a and level information data corresponding to the level information signal A.

The audio signal data and level information data outputted from the data separation circuit 29 are processed by data processing circuits 30 and 31 that perform data deinterleaving, error detection, correction, correction, etc.
Processed in each. After that, the audio signal data is temporarily stored in the data memory 32 and then sent to the clock generation circuit (
(not shown) and is read out by a clock signal from the D/
The A converter 33 converts the signal into an analog signal. This analog signal is supplied to the audio output terminal 0LJT1 of the disc player DP via an LPF (low pass filter) 34. In addition, the level information data is stored in the data memory 35.
The D/A converter 36
becomes an analog signal. This analog signal is LP
It is supplied to the level information output terminal 0UT2 via F37 as a level information signal for setting the recording level.

The audio signal supplied to the output terminal OUT+ of the disc player DP is supplied to the preamplifier 40 via the input terminal IN+ of the tape recorder TR and the resistor R1. The output of the preamplifier 40 is attenuated by an attenuator 41 and applied to a recording head 43 via a recording amplifier 42.
Audio signals are recorded on tape 44. The tape 44 is driven at a constant speed by a tape drive mechanism (not shown). Also, the output terminal 0L of the disc player DP
The level information signal supplied to JT2 is supplied to preamplifier 45 via input terminal IN2 of tape recorder TR and resistor R2. The output of the preamplifier 45 is peak 1
The signal is supplied to a hold circuit 46. Peak hold circuit 4
At 6, the peak level of the level information signal is held, and a voltage corresponding to the held peak level is output as a control signal for the attenuator 41.

In the above configuration, if the signal attenuation amount in the attenuator 41 is set so that the peak level corresponding to the output voltage of the peak hold circuit 46 is equal to the saturation level of the tape 44, the signal applied to the recording head 43 will be The recording Δ level can be increased within the range where the level does not exceed the saturation level, and there is no distortion and S/
This means that N can perform good recording.

FIG. 3 is a block diagram showing an example of a re-recording device, in which a disc player DP and a tape recorder TR are
Connected in the same way as the device shown in the figure.

However, in the tape recorder TR in this example, the audio signal output from the disk plate tl)P is supplied to the LPF 50 via the input terminal IN+ and the resistor R1. This LP "The audio signal that has passed through 50
0. The output of preamplifier 40 is attenuated by attenuator 41, similar to the device of FIG. The output of this attenuator 41 is supplied to an A/D converter 51 and converted into digital data. Digital data output from the A/D converter 51 is applied to the rotary head 54 via an encoder 52 and a recording amplifier 53, and a digital signal is recorded on a tape 55. The tape 55 is driven at a constant speed by a tape drive 8R structure (not shown).

Further, the level information signal output from the disc player DP is supplied to the preamplifier 45 via the input terminal IN2 and the resistor R2, amplified, and then supplied to the peak hold circuit 46, similarly to the device shown in FIG. In the peak hold circuit 46, the peak level of the level information signal is held, and a voltage corresponding to the held peak level is output as a control signal for the attenuator 41.

In the above configuration, if the signal attenuation amount in the attenuator 41 is set so that the peak level corresponding to the output voltage of the peak hold circuit 46 is equal to the maximum input level of the A/D converter 51, it is possible to avoid distortion. You can make recordings.

In the above embodiment, the output level of the oscillator 2 is
It is assumed that the output level of the oscillator 2 is set to be equal to the maximum level of multiple songs recorded on the same disc, but the output level of the oscillator 2 changes to be equal to the maximum level of the famous song at the beginning of the famous song. You can do it like this.

As detailed above, the recording signal recording level setting method according to the present invention digitizes the level information signal having the same signal level as the maximum signal level of the audio signal, and also digitizes the level information signal at the beginning of the audio signal as a subcode. The peak level of the level information signal is retained during re-recording, and the recording level of the audio signal is set according to the retained peak level.
The maximum level of the audio signal is the saturation level of the tape or the
The recording level can be increased within a range that does not exceed the maximum input level of the D converter, and re-recording with a good S/N without distortion in the playback sound can be performed accurately and quickly with simple operations. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a recording device according to the present invention, FIG. 2 is a block diagram showing a re-recording device according to the present invention, and FIG. 3 is a block diagram showing another example of a re-recording device according to the present invention. It is a block diagram.

Claims (1)

[Claims] An audio signal and a level information signal having the same signal level as the maximum signal level of the audio signal are digitized, and the level information signal is added as a subcode to the starting end of the audio signal to generate digital audio. The audio signal is recorded on a disk, and the audio signal is reproduced to generate the digital audio signal.
Maintaining the peak level of the level information signal obtained from the digital audio disc when recording it again on a recording medium other than an audio disc;
A recording signal recording level setting method comprising: setting the recording level of the audio signal according to a maintained peak level.