JPH01102774A - Double recording device - Google Patents

Abstract

PURPOSE:To realize accurate double recording by introducing a disk reproducing signal processed at reference speed to a recording part after applying a noise reduction processing and introducing the disk reproducing signal processed at speed higher than the reference speed to the recording part without applying the noise reduction processing. CONSTITUTION:An analog reproduced signal outputted in a reproducing state at the reference speed from a disk reproducing part 11 is introduced to the recording part 46 after applying the noise reduction processing, and also, the analog reproduced signal outputted in the reproducing state at the speed higher than the reference speed from the disk reproducing part 11 is introduced to the recording part 46 without applying the noise reduction processing. In such a way, it is possible to prevent an adverse effect due to the characteristic of a noise reduction circuit from being given in a state of double recording operated at the speed higher than the reference speed, and to perform the accurate double recording.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a double recording device for recording a playback signal from a disc playback section whose playback speed can be switched onto a recording medium such as a tape. Regarding the improvement of

(Prior Art) As is well known, in the field of audio equipment, for example, a cassette tape recorder records an analog audio signal output from a compact disc player onto a cassette tape, in order to shorten the time required for so-called double recording. In recent years, double recording devices have appeared that are capable of performing disk playback and tape recording at twice the standard speed.

However, this kind of double recording device
Madamamat! This is still in the development stage, and we are currently working on configuration and performance aspects to ensure optimal recording and playback operations for double recording at standard speed and double recording at twice the standard speed. This leaves much room for improvement.

(Problem to be solved by the invention) As described above, by playing a disc at twice the standard speed,
Conventional double recording devices, which have the function of recording the reproduced signal on a recording medium, have the problem that they have not yet been able to fully meet the needs of users.

Therefore, the present invention was made in consideration of the above circumstances, and in addition to subjecting the disc playback signal at a standard speed to noise reduction processing and guiding it to the recording section, the disc playback signal at a speed faster than the standard is subjected to noise reduction processing. By guiding the noise reduction circuit to the recording section without applying noise reduction, the noise reduction circuit is not adversely affected by the characteristics of the noise reduction circuit during double recording at a speed higher than the standard speed, allowing for extremely good double recording that allows accurate double recording. The purpose is to provide recording equipment.

[Configuration of the Invention (Means for Solving Problems) That is, the double recording device according to the present invention can switch the playback speed from the standard speed to a faster speed by switching the rotational speed of the disk. The object of the present invention is to include a disk reproducing section and a recording section for recording an analog playback signal outputted from the disk reproducing section onto a recording medium.

Then, the analog playback signal that is output by the disc playback unit in a playback state at a standard speed is subjected to noise reduction processing and guided to the recording unit, and the analog playback signal that is output by the disc playback unit in a playback state at a speed faster than the standard is output. The structure is such that the signal is guided to the recording section without undergoing noise reduction processing.

(Function) According to the above configuration, since noise reduction processing is not performed on the disc playback signal at a speed faster than the standard, noise reduction processing is not performed on the disc playback signal at a speed faster than the standard. Accurate double recording can be performed without being adversely affected by the characteristics of the reduction circuit.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In FIG. 2, reference numeral 11 denotes a disc playback mechanism section, which includes a disc table 14 on which a disc 12 is placed and is rotated by the action of a disc motor 13, and a disc table 14 on which a disc 12 is placed.
an optical pickup 15 that reads digital data recorded on the disk 2; and a pickup feed motor 1 that moves the optical pickup 15 in the radial direction of the disk 12.
It consists of 6.

Then, the reproduction R output from the optical pickup 15
The F signal is transmitted to an analog amplifier circuit 21 consisting of a current-voltage conversion amplifier circuit 17, 18, a wideband RF amplifier circuit 19, and a feedback circuit 20 that determines the characteristics of the wideband RF amplifier circuit 19.
After being amplified, the signal is supplied to the servo control circuit 22.

This servo control circuit 22 receives input reproduction R.
The F signal is level-sliced at a predetermined slice level and converted into digital data, and a disk motor control signal and a pickup feed motor control signal are generated based on this digital data.

Of these, the disk motor control signal is supplied to the disk motor 13 via a drive circuit 25 consisting of an amplifier circuit 23 and a feedback circuit 24, and its rotational speed is controlled. Further, the pickup feed motor control signal is supplied to the pickup feed motor IB via the drive circuit 2B, and the optical pickup 1
The moving speed of 5 is controlled.

Note that within the analog amplifier circuit 21, a tracking error signal and a focus error signal are generated. Of these, the -tracking error signal is supplied to the optical pickup 15 via a drive circuit 29 consisting of an amplifier circuit 27 and a feedback circuit 28, and tracking servo is performed for an objective lens (not shown). Further, the focus error signal is supplied to the optical pickup 15 via a drive circuit 32 consisting of an amplifier circuit 30 and a feedback circuit 31, and focus servo for the objective lens is performed.

Here, the servo control circuit 22 uses a phase locked loop circuit (PLL) based on the generated digital data.
) 33 to generate a bit synchronization clock.

Then, the servo control circuit 22 generates a data extraction clock based on the bit synchronization clock and outputs it to the digital signal processing circuit 34 together with the digital data.

This digital signal processing circuit 34 synchronizes with a system clock outputted from a clock generation circuit 3B including a crystal oscillator 35, and a RAM (read only memory) 3.
7 is used to perform jitter component absorption, error correction, and correction processing on digital data. The digital data output from this digital signal processing circuit 34 is then transferred to a D/A (digital/analog) conversion circuit 38.
The R-channel analog signals are converted into R-channel analog signals and supplied to a sound reproduction system (not shown) via amplifier circuits 39 and 40 and output terminals 41 and 42, respectively.

Here, this compact disc player has:
A reproduction speed control circuit 43 is provided.

When the disc 12 is required to be played back at twice the standard playback speed, the playback speed control circuit 43 controls the crystal oscillator 35 and the phase-locked loop' circuit 33 to operate at twice the standard frequency. A wideband RF amplifier circuit 1 is connected to each feedback circuit 20, 24, 28, and 31 to generate a clock and a bit synchronized clock.
9. This functions to switch the characteristics of the drive circuits 25, 29, and 32 so that they are optimal for reproduction at twice the standard speed.

The playback speed control circuit 43 also has the function of causing the display circuit 44 to display the operating status, time, etc. of the compact disc player.

Here, the system clock output from the clock generation circuit 36 is supplied to the cassette tape recorder 4B via the digital signal processing circuit 34 and the synchronization control circuit 45. This cassette tape recorder 46 is of a type in which the tape running speed during recording and reproduction changes in synchronization with the system clock, that is, the recording and reproduction speed changes.

Therefore, when the disc 12 is being played back at the standard speed, the system clock 4 is also at the standard frequency, so when the cassette tape recorder 4G is put into the recording state, its recording speed is also standard, and the output terminal 41. The acoustic signal output from 42 is recorded on the tape at standard speed. In addition, when the disc 12 is being played back at twice the standard speed, the system clock is also at twice the standard frequency, so if the cassette tape recorder 4B is set to recording mode, the recording speed will also be twice the standard speed. Therefore, the acoustic signal output from the output terminals 41° and 42 is recorded on the tape as standard 2.
Records will be recorded at twice the speed.

In the above structure, the characteristic features of the present invention will be explained below with reference to FIG. That is,
The disc reproduction signal outputted from the output terminals 41 and 42 is supplied to a cassette tape recorder 46 via a noise reduction circuit 47 and an output terminal 48.

The noise reduction circuit 47 performs noise reduction processing on the input signal and outputs the input signal with an L (low) level signal supplied to its control terminal C, and outputs an H (high) level signal to its control terminal C. It operates to output the input signal as it is without performing noise reduction processing when the signal is supplied.

Here, the control end C of the noise reduction circuit 47 is connected to the movable piece 49a of the noise reduction switch 49 via a diode Di with the illustrated polarity. The first fixed contact 49b of this noise reduction switch 49 is grounded, and the second fixed contact 49c is connected to a power supply terminal 50 to which DC voltage +VDD is applied. - For this reason, the movable piece 4 of the noise reduction switch 49
By switching and connecting 9a to the first fixed contact 49b side, the control terminal C of the noise reduction circuit 47 is brought to the L level, so that the noise reduction circuit 47 is controlled to perform noise reduction processing. Further, by switching and connecting the movable piece 49a of the noise reduction switch 49 to the second fixed contact 49e side, the noise reduction circuit 4
Since the control terminal C of 7 is set to H level, it is controlled not to perform noise reduction processing.

Here, the control terminal C of the noise reduction circuit 47 is connected to an input terminal 51 to which a control signal output from the reproduction speed control circuit 43 is supplied via a diode D2 of the polarity shown. The control signal supplied to this input terminal 51 is at the L level when the disc is reproduced at the standard speed, and becomes the H level when the disc is reproduced at twice the standard speed (hereinafter referred to as double speed reproduction).

Therefore, when playing a disc at standard speed, an L level control signal is supplied to the input terminal 51, so by switching the noise reduction switch 49, the noise reduction circuit 47 can be configured to perform noise reduction processing or It can be controlled so that it does not occur. In addition, when playing a disc at double speed, the input terminal 51
Since the H level control signal is supplied to the control terminal C of the noise reduction circuit 47, the control terminal C of the noise reduction circuit 47 is set to the H level regardless of the switching position of the noise reduction switch 49, so that no noise reduction processing is performed. be done.

According to the configuration of the above embodiment, since noise reduction processing is not forcibly performed during disc playback at double speed, there is no possibility that the noise reduction process will be adversely affected by the characteristics of the noise reduction circuit 47 in a double recording state at double speed. This makes it possible to perform accurate double recording.

That is, when playing a disc at double speed, the output terminal 41
．． Since the frequency of the disc playback signal output from 42 also doubles, if the noise reduction circuit 47 performs noise reduction processing as it is, the characteristics of the noise reduction circuit 47 will not follow suit and will instead have an adverse effect on the disc playback signal. A problem arises.

Therefore, the present invention makes it possible to perform good double recording without adversely affecting the disc playback signal by forcibly not performing noise reduction processing in the double-speed double recording state. be.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the scope of the invention.

[Effects of the Invention] Therefore, as detailed above, according to the present invention, a disc playback signal at a standard speed is subjected to noise reduction processing and guided to the recording section, and a disc playback signal at a speed higher than the standard speed is guided. Since the signal is led to the recording section without undergoing noise reduction processing, it is possible to perform accurate double recording without being adversely affected by the characteristics of the noise reduction circuit during double recording at speeds faster than standard. An extremely good double recording device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing an embodiment of a double recording device according to the present invention, and FIG. 2 is a block diagram showing the overall configuration of the embodiment. 11... Disk playback mechanism section, 12... Disk,
13... Disc motor, 14... Disc table, 15... Optical pickup, 1B... Pickup feed motor, 17.18... Current-voltage conversion amplifier circuit, 19... Broadband RF amplification Circuit, 20... Feedback circuit, 21... Analog amplifier circuit, 22... Servo control circuit, 23... Amplifier circuit, 24...
Feedback circuit, 25.26 drive circuit, 27... amplifier circuit,
28...Feedback circuit, 29...Drive circuit, 30...
Amplifying circuit, 31... Feedback circuit, 32... Drive circuit,
33... Phase locked loop circuit, 34... Digital signal processing circuit, 35... Crystal oscillator, 3B... Clock generation circuit, 37... RAM, 38... D/A conversion circuit, 39 .40...Amplification circuit, 41, 42...Output terminal, 43...Playback speed control circuit, 44...Display circuit, 45...Synchronization control circuit, 46...Cassette tape recorder, 47 Noise reduction circuit, 48...
・Output terminal, 49... noise reduction switch,
50...Power terminal, 51...Input terminal. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A disc playback unit capable of switching the playback speed between a standard speed and a speed faster than the standard by switching the rotational speed of the disc, and a recording unit that records an analog playback signal output from the disc playback unit on a recording medium. In the double recording device, the disc playback unit performs noise reduction processing on an analog playback signal outputted in a standard speed playback state and guides it to the recording unit,
A double recording device characterized in that the disc playback section is configured to guide an analog playback signal outputted in a playback state at a speed faster than a standard to the recording section without subjecting it to the noise reduction processing.