JPH0397165A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To precisely detect a peak value by comparing the maximum value at the finishing time of high-speed searching action with a reference value which is previously set and setting a level when a music signal is recorded. CONSTITUTION:The music signal recorded on a disk 1 is sampled and reproduced by a searching action control means 4 and the peak value thereof is detected by a signal processing means 3. Besides, the maximum value of the peak value of every sampling is stored in the first and second peak value storage means 5 and 6 and the average value thereof is calculated by a peak average value calculation means 8. Then, the peak level for setting a recording level is detected. Therefore, the optimum peak level for setting the recording level can be detected. Besides, a peak value storage control means 7 is provided. Then, when a signal read error occurs, the peak value which is not affected by the signal of a large level generated when the error occurs is detected by compensating a peak data value. Thus, the recording level is set by precisely detecting the peak value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disk reproducing apparatus having a dubbing function for recording onto a magnetic recording means such as a tape recorder.

2. Description of the Related Art In recent years, a function has been invented for disc playback devices such as CD players, CD radio cassette tape recorders, etc. to automatically set an optimum recording level when recording onto a tape recorder.

An example of a conventional disc playback device will be described below with reference to the drawings.

FIG. 3 is a block diagram showing the configuration of an example of a conventional disc playback device. 1 is a disk-shaped recording medium (hereinafter referred to as a disk) such as a CD, and 2 is an optical pickup for reading the signals recorded on the disk 1. Signal reading means 9 consisting of an optical pickup drive unit, a servo circuit for drive control, etc.; 3 is a signal processing means for receiving the signal from the signal reading means 2 and converting it into an audio signal; 4 is constant for the signal reading means 2; Search operation control means for controlling a high-speed search operation by alternately repeating a playback operation and a track young operation for each time; 11;
41 is a level meter, 42 is a peak signal hold means, and 10 is a peak signal hold means 4.
12 is a magnetic recording means such as a tape recorder, and 13 is a switch for starting the peak level N search operation. This is the peak search start switch.

The operation will be explained below. First, when the beak search start switch 13 is turned on, the search operation control means 4 controls the signal reading means 2 to perform a high-speed search operation by repeatedly performing a reproduction operation and a track jump operation for a fixed period of time. At this time, in the reproduction operation, the audio signal passes through the signal processing means 3, reaches the D▲ conversion means 11, and is converted into an analog signal. The signal level of the converted analog signal is displayed by a level meter 41 and peak signal hold means 42
detects and holds the peak value, and the recording level setting means 10 sets the recording level so that no distorted sound occurs when the signal level is recorded, and the magnetic recording means 1
2 will be recorded.

Problems to be Solved by the Invention However, in the above prior art, even if the signal reading operation by the signal reading means 2 becomes unstable and noise is generated after the completion of the track jump operation, the peak signal holding means 42 operates to treat the noise as a peak signal. This method has the disadvantage that accurate peak detection cannot be performed because the peak is detected.

Means for Solving the Problems In order to solve the above problems, the present invention provides a signal that detects the peak value of a music signal recorded on a disk at regular intervals and outputs the value as a digital signal. processing means;
a search operation control means for controlling a high-speed search operation by alternately repeating a reproduction operation and a track young operation at fixed time intervals; and a peak output from the signal processing means at the Nth reproduction operation of the high-speed search operation. a first peak value storage means for storing a value; a second peak value storage means for storing a peak value in the H-1st reproduction operation; a peak value storage control means for controlling storage processing of the peak value storage means; and calculating an average value of the numerical values stored in the first peak value storage means and the second peak value storage means each time during playback operation. a peak average value calculation means for performing comparison and updating every time a playback operation is performed, and a maximum value storage means for storing the maximum value of the average value obtained by the peak average value calculation means; and a maximum value storage means for storing the maximum value at the end of the high speed search operation. The recording level setting means sets the level when recording the music signal to the magnetic recording means or the like by comparing the maximum value stored in the means with a preset reference value.

Effects of the present invention'd With the above-described structure, when dubbing from a disc playback device such as a C or D player to a magnetic recording means such as a tape recorder, the music signal recorded on the disc is sampled by the search operation control means. The peak value is detected by the signal processing means, and the maximum value of the peak value for each sampling is determined as the first. The second peak value storage means stores the peak value, and the peak average value calculation means calculates the average value to detect the peak level for setting the recording level N, so that the average peak level N for each sampling period can be calculated. Since it is possible to generate a single pulsed signal 1, d
Since continuous pulse signals can be detected as peaks without being detected as peaks, peak level detection can be performed that is optimal for recording level setting. By supplementing the peak data value at this time, peak value detection can be performed that is not affected by a large level signal when an error occurs.

Embodiment Hereinafter, a disc playback device according to an embodiment of the present invention will be described.
This will be explained with reference to the drawings. FIG. 1 is a block diagram showing the structure of a disc playback device according to the present invention. 1st
In the figure, 1 is a disc-shaped recording medium such as a CD (hereinafter referred to as
Expressed as a disk. ), 2 is a signal reading means consisting of an optical pickup, an optical pickup drive unit, a drive control servo circuit, etc. for reading the signal recorded on the disc 1, and 3 is an audio signal receiving signal from the signal reading means 2. 4 is a signal processing means for converting the peak value into an 8-bit digital signal at regular time intervals, and outputs the value as an 8-bit digital signal. Search operation control means for controlling the high-speed search operation by repeating alternately, and 6 a first peak value for storing the peak value from the signal processing means 3 in the Nth reproduction operation of the high-speed search operation. The storage means 6 is a second peak value storage means that similarly stores the peak value in the N-1st reproduction operation, and in this embodiment, both peak value records are the first largest peak value and the second largest peak value. 2 with a large peak value
It was designed to memorize two values. 7 detects a signal reading error during the reproduction operation, and the first peak value storage means 6
8 is a peak value storage control means for controlling the storage processing by the peak value storage means 8, and a peak value storage control means 8 for calculating the average value of the numerical values stored in the first peak value storage means 6 and the second peak value storage means 6 for each reproduction operation. Mean value calculation means; 9 is a maximum value storage means for comparing and updating the layers at the time of playback operation and storing the maximum value of the average value obtained by the peak average value calculation step 7; 10 is a maximum value storage means at the end of the above-mentioned high-speed search operation; A recording level setting device for setting the level when recording the music signal to a magnetic recording device etc. by comparing the maximum value stored in the means 9 with a preset reference value; 11 is a signal processing stage; 2 is a D▲ conversion means for converting the audio signal into an analog signal, 12 is a magnetic recording means such as a tag recorder, and 13 is a switch for starting the peak repeat ν search operation (hereinafter referred to as a peak search start switch). be.

FIG. 2 is a flowchart showing the processing contents of each section shown in FIG.

The specific operation will be explained below using FIGS. 1 and 2.

1. When the severe level search operation is started by turning on the peak search start switch 13, the maximum value storage means 8 and the first
, the second peak value storage means 5 and 6 are initially reset, and the search operation control stage 4 controls the signal reading means 2 to perform a search operation by alternately performing a reproduction operation and a track jump operation for a certain period of time. . In this embodiment, as shown in step 30 in FIG. 2, the tracking is performed once every four times the peak value is read.

Regarding the playback operation, the signal recorded on the disk 1 is read by the signal reading stage 2, and as shown in step 23, the signal processing stage 3 converts it into an audio signal, and at the same time detects the peak value at fixed time intervals and outputs it. do. The first peak value storage means 6 stores the first largest value and second largest value, so if these are designated as MX1 and MX2, in steps 26 to 29 in FIG. If it is larger, it is updated and stored in the first peak value storage means 6 in step 27.29. If there is an error in the search operation at this time, step 24.
25, the peak value storage control means 7 detects the occurrence of an error based on the state of the search operation control means 4, and the first
The minimum value among reference values to be described later is stored in the peak value storage means 6. Next, in step 30, the number of readings of the peak data value is checked, and if 1 reads 4 times, the process returns to step 23 and repeats the above process, and after reading 4 times, the process moves to step 31 and subsequent steps. The second peak value storage means 6 stores values corresponding to MX1 and MX2 at the time of the previous reproduction operation, and when the button is pressed, the values corresponding to MX3 and MX4 are stored.
Then, in step 31 of FIG. 2, the peak average value calculation means 8 calculates the CD'F average values for MX1, MX2, MX3, and MX4, and in step 32, the MX1 and MX2 of the first peak value storage means 6 are calculated. The data are transferred to and stored in MXs and MX4 of the second peak value storage means 6, respectively. Next, the step 33 compares the value calculated by the peak average value calculation means 8 with the value stored in the maximum value storage means 9, and if it is larger, the step 34 updates the value. In step 35, the search operation control means 4 performs a track jump operation to move to the next reproduction portion, and the process returns to step 22 to repeat the process for calculating the maximum peak value.

When the search operation ends, it is determined in step 36, and the process moves from step 37 to step 40.

That is, the recording level p setting means 10 compares the value stored in the maximum value storage means 9 with a preset reference value to set the recording level.

For example, set the reference value to X'▲O'. If x'DO', then
′▲O′ or above ゛The recording level is normal and also SDB attenuation,
Settings such as cslb attenuation are made for x/D O / or more. As described above, the recording level N setting means 10
At the set recording level, the audio signal of the signal processing means 3 is converted into an analog signal by the D▲ conversion means 11, and the recording operation is performed by the magnetic recording means 12.

A specific calculation example is shown below. The peak value detected by the signal processing means 3 is (X'30',
x'8D', x'lco', 3C'DB'), 2nd time (x'▲o' (=:r-ra-), x'Do'X
'IE8',X'Go'), 3rd time (X'
F O'x'Ba', x'▲8', X'▲0/
), then in the first reproducing operation, MX1=X'KQ',MX2=X' D are stored in the first peak value storage means 6.
8' is stored, and further MX is stored in the second peak value storage means 6.
3 and MX4, respectively. Next, in the second playback operation after the track young, it is detected that there was an error in signal reading, and the data of D x/▲O' is supplemented and the first peak value storage means 6 is stored as MX
1=x'1B' and MX2=x'Do' are stored. At this time, MX3=X'IQ', MX4=x'D8
′, so by the peak average value calculation means 8? The average value resulting from the calculation is x'DC', and the value is stored in the maximum value storage means 9. Also, in the third playback operation, MX1
=x'F■', MX2=:E'B1B', MX3=
x'1B',MX4=x'DO'. The average is X'
Even though there is a maximum value x'Fo' which becomes D B', the average value becomes smaller during the second reproduction operation, so the value in the maximum value storage means 9 is not updated. If the value stored in the maximum value storage means 9 at the time of completion of the high-speed search operation is x'D C', then with respect to the reference value x'Do',
x'Do'(x'Dc', so recording level setting means 1
The peclb attenuation is set to 0 and the magnetic recording means 12
The recording operation is performed.

As described above, according to this embodiment, the first and second peak value storage means 6.6 are provided to store a total of four peak data values, calculate the average value thereof, and set the recording repeat μ. Therefore, a single pulsed signal is not detected as a peak, and by providing the peak value storage control means 7, when a signal reading error occurs, the data of the value of I'▲0' is compensated, so the error is eliminated. It achieves an excellent peak level detection operation that is unaffected by large level signals when they occur, making it possible to set the optimal recording level.

Effects of the Invention As described above, the disc playback device of the present invention includes a signal processing means for detecting the peak value of a music signal recorded on a disc at regular time intervals and outputting the peak value as a digital signal; a search operation control means for controlling a high-speed search operation by alternately repeating a reproduction operation and a track jump operation; and a search operation control means for controlling a high-speed search operation by alternately repeating a reproduction operation and a track jump operation; a first peak value storage means for storing a value, a second peak value storage means for storing a peak value in the N-1st reproduction operation, and a first peak value storage means for each reproduction operation. By providing a peak average value calculation means for calculating the average value of the numerical values stored in the second peak value storage means, a single pulsed signal is not detected as a peak value, and a continuous pulsed signal is detected. can be detected as a peak value, so an average peak value can be detected.Furthermore, a peak value storage device detects a signal reading D error during a reproduction operation and controls storage processing by the first peak value storage means. By providing the control means, even if a signal reading error occurs in the signal reading means, it can be compensated for with an appropriate data value, so peak value detection can be performed while reducing the influence of the error signal. Further, a maximum value storage means is provided which performs comparison and updating every time the reproduction operation is performed, and stores the maximum value of the average value obtained by the peak average value calculation means, and stores the maximum value in the maximum value storage means when the high speed search operation is completed. Since the recording level is set by providing a recording level setting means that compares the maximum value with a preset reference value, C.
To realize a disc playback device capable of accurately detecting peaks and setting a recording level μ when recording from a D (section) to a tape recorder (section) and recording without distortion. I can do it.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the disc reproducing apparatus of the present invention, FIG. 2 is a flowchart of the same, and FIG. 3 is a block diagram showing the groove structure of a conventional example. DESCRIPTION OF SYMBOLS 1...Disk, 2...Signal reading means, 3...Signal processing means, 4...Search operation control means, 5...No. 1 peak value storage means, 6... second peak value storage means, 7...
・Peak value storage control means, 8...Peak average value calculation means, 9...Maximum value storage means, 10...
. . . Recording level p setting means, 11. Old . . . D▲ conversion means, 12. . . Magnetic recording means, 13. . .
Beak search start switch, 41... Level p meter, 42... Peak signal hold means.

Claims (1)

[Claims] A signal processing means detects the peak value of the music signal recorded on the disc at fixed time intervals and outputs the value as a digital signal, and high-speed search operation is performed by alternately repeating the playback operation and track jump operation at fixed time intervals. a first peak value storage means for storing a peak value from the signal processing means in the N-th reproduction operation of the high-speed search operation; a second peak value storage means for storing a peak value during an operation; a peak value storage control means for detecting a signal reading error during a reproduction operation and controlling storage processing of the first peak value storage means; peak average value calculation means for calculating the average value of the numerical values stored in the first peak value storage means and the second peak value storage means at each time; A maximum value storage means stores the maximum value of the average value obtained by the calculation means, and the music signal is magnetically generated by comparing the maximum value stored in the maximum value storage means with a preset reference value at the end of the high speed search operation. 1. A disc playback device comprising a recording level setting means for setting a level when recording to a recording means or the like.