JPS62189629A - Dubbing device - Google Patents

Abstract

PURPOSE:To evade deterioration in dubbing quality by using a reproducer which reads out the signals out of the 1st recording medium, a signal regeneration circuit which shapes those read-out signals into digital signals, and a recorder which supplies the output signal of the signal regeneration circuit and records the shaped signal to the 2nd recording medium. CONSTITUTION:Such a dubbing device is provided with a regenerator 10 which reads signals out of a recording medium 1, a signal regeneration circuit 30 which shapes the read-out RF signal into digital signals, and a recorder 20 which supplies the output signal of the circuit 30 and records the shaped signals to a recording medium 2. Thus the distortion of amplification of the regenerated RF signal and the jitter of the signal are removed by the circuit 30. Then the RF signal is shaped into an original digital waveform and recorded to the medium 2. Thus the copied signal can secure the quality approximately equal to that of the original signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording and reproducing apparatus for recording and reproducing digital signals on a recording medium such as a tape, a disk, and a card.
In particular, the present invention relates to a dubbing device that reads signals from a first recording medium and copies them to a second recording medium.

2. Description of the Related Art In recent years, with the spread of cassette tape recorders, the number of dubbing devices for copying original tapes or records has increased.

An example of the conventional dubbing device mentioned above will be described below with reference to the drawings.

Figure 4 shows the configuration of a conventional dubbing device.
2 is a recording medium, 10 is a playback machine, and 20 is a recorder, and the RF multiplied signal output from the playback machine is input to the recorder.

The operation of the dubbing device configured as described above will be explained below.

First, the reproducing device 10 reads out a signal recorded on the recording medium 1, converts it into an RF multiplied signal, and outputs the signal. The recorder 20 records this RF multiplied signal as it is on the recording medium 2, and dubbing is performed.

Problems to be Solved by the Invention However, with the above configuration, the frequency characteristics of the reproducing machine are not ideal, the expansion and contraction of the recording medium 1, and
Because the wow and fluff of the motor that rotates the recording medium 1 is not zero, along with the reproduced RF signal waveform distortion,
Its quality has deteriorated due to the influence of the shifter, so
If this signal was recorded on the recording medium 2 as it was, the signal recorded on the recording medium 2 would be thicker (degraded) than the original signal recorded on the recording medium 1.

Means for Solving the Problems In order to solve the above problems, the dubbing device of the present invention has the following features:
A playback device that reads a signal from a recording medium 1, a signal playback circuit that shapes the readout RF multiplied signal digital signal, and inputs the output signal of the signal playback circuit, and records the shaped signal on a recording medium 2. It consists of a recorder and a recorder.

According to the above-described configuration, the present invention removes amplitude distortion and jitter of the reproduced RF multiplied signal in the reproduction circuit, shapes it to the original digital waveform, and then records it on the recording medium 2, so that the copied signal is , it will maintain almost the same quality as the original signal.

Embodiment Hereinafter, a dubbing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a dubbing device according to an embodiment of the present invention. In FIG. 1, 1 and 2 are recording media, and 10
is a playback device, 20 is a recorder, 30 is a signal playback circuit,
It is installed between the player 10 and the recorder 20.

The operation of the dubbing apparatus configured as described above will be explained below with reference to FIGS. 1 to 3.

First, FIG. 3 shows an example of a specific circuit configuration of the signal reproducing circuit 30, and FIG. 2 shows waveforms of each part. 31 is a waveform shaping circuit, 32 is a clock reproducing circuit, and 33 is a flip-flop, which generates an RF multiplied signal read out from the recording medium 1 by the reproducing device 10, and the waveform is distorted as shown in FIG. 2 due to the above-mentioned reasons. It becomes. The RF multiplied signal waveform shaping circuit 31 converts the signal into a pulse signal having a waveform as shown in FIG. As the waveform shaping circuit, for example, a limiter amplifier, a comparator, etc. can be used. If the RF multiplied signal has a property of zero DC component, a feedback type shaping circuit may be used that integrates the shaped pulse signal and controls the threshold voltage of the limiter using its average voltage.

The waveform-shaped pulse signal is input to a clock regeneration circuit 32, which outputs a clock whose phase is synchronized with the rising or falling edge of the pulse signal. As the clock recovery circuit, a tank circuit, a phase-locked loop circuit (abbreviated as a PLL circuit), etc. can be used. P
By appropriately setting the response speed of the LL circuit, it is possible to synchronize it with the average frequency of the input pulse signal, and it is possible to generate a clock from which jitter contained in the input pulse signal has been removed. If the above-mentioned pulse signal is punched out using the flip-flop 33 that operates with this clock, the output becomes a digital signal that is synchronized with the clock and has no jitter. This signal has almost the same quality as the signal recorded on the recording medium 1.

Dubbing is performed by inputting this clock and digital signal into the recording device 20, rotating the recording medium 2 in synchronization with the clock, and recording the digital signal.

As described above, according to this embodiment, there is a reproducing device that reads out a signal from the recording medium 1, a signal reproducing circuit that formats the read out RF multiplied signal digitally, and an output signal of the signal reproducing circuit that is inputted and recorded. The medium 2 is provided with a recorder that records the shaped signal, and the signal reproducing circuit further includes a waveform shaping circuit that shapes the input RF multiplied signal amplitude, converts it into a pulse signal, and outputs it, and a waveform shaping circuit that shapes the input RF multiplied signal amplitude and converts it into a pulse signal. By comprising a clock regeneration circuit that outputs a synchronized clock and a flip-flop that synchronizes the phase of the pulse signal with the clock and outputs it as a digital signal, the quality of the copied signal is almost the same as the original. can be kept.

A second embodiment of the present invention will be described below with reference to the drawings. 5 and 6 are block diagrams of a signal reproducing circuit of a dubbing device showing a second embodiment of the present invention.

In FIG. 5, numeral 31 denotes a waveform shaping circuit having the same configuration as that in FIG. 1. The difference from the configuration shown in FIG. 1 is that a timing circuit 34 and a switching circuit 35 are provided. FIG. 6 is a detailed diagram of the timing circuit, where 32 is a clock recovery circuit and 36 is a timing generation circuit.

The operation of the dubbing device configured as described above will be explained below.

The waveform-shaped pulse signal is input to a timing circuit 34, where a clock and control signal synchronized with the pulse signal are generated. The timing circuit 34 is composed of the clock regeneration circuit 32 and the timing generation circuit 36 in the first embodiment, and the timing generation circuit 36 outputs a control signal having a constant time width in synchronization with the pulse signal. This control signal is input to the switching circuit 35, and the switching circuit 35 replaces a predetermined period of the pulse signal with other digital data and outputs it. Furthermore, the switching circuit 35 includes a flip-flop that operates with the clock generated by the timing circuit, and punches out the switched signal and outputs it as a digital signal.

As other digital data to be replaced, for example, when the pulse signal is a reproduction signal of a compact disc, a subcode etc. can be cited as a candidate. That is, when dubbing while editing signals played from several compact discs, it is necessary to add a new subcode containing the track number, etc., and this new subcode is transferred to the switching circuit 35. used as digital data input. As a result, the edited music signal and new subcode are recorded on the dubbed disc.

As described above, by providing a switching circuit in the signal reproducing circuit and switching a certain period of the waveform-shaped pulse signal to other digital data at a timing synchronized with this and outputting it as a digital signal, dubbing can be performed. Even if dubbing is performed while editing, it is possible to create a disc with correct track numbers, time codes, etc. recorded.

Effects of the Invention As described above, the present invention includes a reproducing device that reads a signal from a recording medium 1, a signal reproducing circuit that formats the read out RF multiplied signal digital signal, and an output signal of the signal reproducing circuit that inputs the output signal of the signal reproducing circuit. By providing the recording medium 2 with a recording device that records the shaped signal, dubbing can be performed while maintaining substantially the same quality as the original signal.

Furthermore, in order to maintain the dubbing quality of digital signals,
This method is very simple compared to the method in which the RF signal is demodulated inside the playback device, processing such as error correction is performed, and then an error correction code is added again inside the recorder, and the modulation is performed and recorded on the recording medium 2. You can perform high-quality dubbing with a playback or recording device.

In addition, by providing a switching circuit in the signal reproducing circuit and dubbing by replacing a certain period of the reproduced pulse signal with other digital data, even if dubbing is performed while editing, the correct sub It becomes possible to create a disc with a code, etc.

Furthermore, it is also possible to perform dubbing while adding still image data as a subcode.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a dubbing device according to a first embodiment of the present invention, FIG. 2 is a timing diagram showing the operation of FIG. 1, and FIG. 3 is a configuration diagram of a signal reproducing circuit shown in FIG. 1. FIG. 4 is a block diagram of a conventional dubbing device, and FIGS. 5 and 6 are block diagrams of a signal reproducing circuit of a dubbing device according to a second embodiment of the present invention. 1.2...recording medium, 10...player, 2o...recorder, 30...waveform playback circuit, 31... Waveform shaping circuit, 32...
- Clock regeneration circuit, 33...Flip-flop, 34...Timing circuit, 35-Old...Switching circuit, 36...Timing generation circuit. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) A playback device that reads a signal from a first recording medium, a signal playback circuit that formats the read signal into a digital signal, and an output signal of the signal playback circuit that is input to the playback device that reads the signal from the second recording medium. A dubbing device comprising: a recorder that records a shaped signal; (2) The signal regeneration circuit includes a waveform shaping circuit that shapes the amplitude of an input signal, converts it into a pulse signal, and outputs it, a clock regeneration circuit that outputs a clock that is phase-synchronized with the pulse signal, and a clock regeneration circuit that outputs a clock that is phase-synchronized with the pulse signal, and a clock regeneration circuit that outputs a clock that is phase-synchronized with the pulse signal. The dubbing device according to claim 1, further comprising a flip-flop that outputs a digital signal in phase synchronization with the dubbing device. (3) The signal regeneration circuit includes a waveform shaping circuit that shapes the amplitude of the input signal, converts it into a pulse signal, and outputs it, a timing circuit that outputs a clock and control signal that are phase-synchronized with the pulse signal, and a timing circuit that outputs the control signal that is phase-synchronized with the pulse signal. The dubbing device according to claim 1, further comprising a switching circuit that selectively outputs other digital data instead of the pulse signal for a certain period of time.