JP3459145B2 - Digital signal recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to a recording medium.
Digital signal recording / reproduction for recording / reproducing digital signals
It concerns the device. 2. Description of the Related Art In recent years, digital audio / video equipment
There has been remarkable progress in the use of
For commercial and broadcast stations that use magnetic tape
Digital video tape recorder (hereinafter, digital V
TR), but also for consumer use
You. Under these circumstances, for example, Japanese Patent Application Laid-Open No. Hei 5-234
No. 253, digital audio signal recording and reproduction
Method and recording / reproducing apparatus, a consumer digital V
Digital audio signal recording and playback method for TR was also announced.
I have. A conventional digital audio signal recording / reproduction will be described below.
Of digital audio signal recording and reproducing apparatus by method
The figure is shown in FIG. In FIG. 8, reference numeral 100 denotes a digital
Audio interface (DI / F) receiver, 10
1 is an AD converter (A / D), 102 is a digital audio
Output signal of the receiver 100 of the
First switch for switching between the output signal of converter 101 and
, 103 is an encoder for digital audio signal data,
104 samples the audio signal from the horizontal synchronization signal of the video signal
PLL to create a ring clock, 105 is a crystal oscillation
, The output clock of the PLL 104 and the crystal oscillator
105 and the output clock of the VCO 120
A second switch 107 for selecting one from among the
Receiver 100
Bi-phase demodulation clock and second switch 1
A third switch for switching the output clock 06, 10
Reference numeral 8 denotes a frequency divider for dividing the output clock of the third switch 107.
1 counter, 109 is a counter of the first counter 108
From the frame value of the video signal
Number of digital audio signal samples recorded in the frame cycle
, A sample number discriminator for discriminating the
Digital audio signal processed by 3 and number of samples
A multiplex that multiplexes the output signal of the discriminator 109
, 112 modulates the output signal of the multiplexer 111.
Modulator 113, demodulator 113, output of demodulator 113
Force signal into digital audio signal and sample number identification signal
The demultiplexer 116 is a digital audio signal.
Signal decoder 117 outputs the output clock of the VCO 120
The second counter for frequency division, 118 is the second counter 11
7 between the load pulse and the frame clock of the video signal
A phase comparator 119 for performing phase comparison has a phase comparator 118
A low-pass filter (LPF) for band-limiting the output signal,
120 is generated by the output signal of the low-pass filter 119
The VCO 121 whose frequency is controlled
DA converter (D / A) for DA conversion of the output signal, 122
Converts the output signal of the decoder 116 into a digital audio
Digital audio that is converted to an interface signal and transmitted
Transmitter of the radio interface (DI / F)
You. [0005] The conventional digital device configured as described above
The operation of the audio signal recording and playback device is described below.
I do. In the case of an analog input, the first switch 102
The output signal of the AD converter 101 is selected, and the second switch
Output clock of PLL 104 selected by 106
Alternatively, a sampler which is an output clock of the crystal oscillator 105
Clock that has a frequency equal to or
AD converter 101 digitizes the analog input signal.
Into a signal. The first switch 102 performs AD conversion
The output signal of the detector 101 is selected, and the third switch 107
The output clock of the crystal oscillator 105 is selected. In the case of digital input, digital
The receiver 100 of the DIO interface is bi-phase
Bi-phase demodulation of the signal transmitted after modulation
Digital audio signal, sampling frequency and its integral multiple
Generates a clock with a frequency of First switch 1
02 is a digital audio interface receiver
100 selects the digital audio signal to be output,
Switch 107 is a digital audio interface
The clock output by the receiver 100 is selected. The encoder 103 has a third switch 107
Of the first counter 108 that counts the output clock of
Upon receiving the count value, the output signal of the first switch 102
Interleaving of certain digital signals, with error correction code
Perform addition. The sample number discriminator 109 outputs the first count.
And the frame clock of the video signal
Audio recorded in one frame cycle of the video signal
The number of samples of the signal is determined, and the
Code (or clear) control and the number of samples
The identification signal is sent to the modulator 112 via the multiplexer 111.
Output. The multiplexer 111 includes an encoder 103
Audio signal data and sampler processed by
The output signal of the number discriminator 109 is multiplexed. Modulator 1
12 is suitable for recording the output signal of the multiplexer 111
After the modulation, the signal is output to the recording amplifier, for example, as shown in FIG.
L channel signal,
The R channel signal is recorded on another track on the tape
You. During normal reproduction, the input signal from the reproduction amplifier is
The signal is demodulated by the demodulator 113 and the demultiplexer
114, a digital voice signal and a sample number identification signal.
After the digital audio signal is divided into
16 undergoes error correction and deinterleaving, etc.
A converter 121, digital audio interface
Is output to the transmitter 122. On the other hand, the sample number identification signal is
To the data 117. In the second counter 117, the sun
Load control is performed by the pull number identification signal. That is,
Recorded in one frame period indicated by sample number identification signal
Up to the number of sampled digital audio signals
And then load 0. In the phase comparator 118,
The load pulse of the second counter 117 and the video signal
Phase comparison with the
Output to the filter 119. Bandwidth with low pass filter 119
The limited signal is input to the VCO 120 and the VCO 12
Control the transmission frequency of 0. [0011] Digital audio interface
Transmitter 122 uses the output clock of VCO 120
The digital audio signal output from the decoder 116.
Convert to digital audio interface signal and output
I do. In the DA converter 121, the output of the VCO 120 is output.
The clock output from the decoder 116
The audio signal data is DA-converted and output. [0012] However, the above-mentioned problem is not solved.
Using a conventional digital audio signal recording / reproducing device
Processing of digital audio signal in digital VTR
Method uses the clock of the crystal oscillator 105 during recording.
When recording, this clock should be synchronized with the video signal.
Of the digital audio signal processing based on this clock.
Since the clock is not synchronized with the video signal,
Digital audio signal by clock asynchronous to image signal
Is synchronized with the digital VTR that processes
Digital audio signal is processed by the clock
Digital sound reproduced between other digital VTRs
Voice signal using digital audio interface
Therefore, there has been a problem that mutual transmission is not possible. Also, by after recording,
Record the L channel or R channel separately later
The L channel and the R channel have different sample numbers.
Recording of digital interface input signals
There was also a problem that it was not possible. The present invention solves the above problems,
A digital audio signal is generated by a clock that is asynchronous to the video signal.
Digital video tape recorder that processes
A digital audio signal is generated by a clock synchronized with the signal.
Between the processing digital video tape recorder
Digital audio signals can be transmitted to each other
No matter how you edit, and how many times
Even if the number of samples per frame is always the same
Control to maintain frame continuity,
Even after recording one channel, always check
A channel that allows the number of samples to be the same between channels.
Provided is a digital signal recording / reproducing apparatus. [0015] To solve the above-mentioned problems,
Claims of the present invention 1 Digital signal recording and reproduction described in
The device is compatible with video and audio analog signals.
Digital signals on a recording medium,
Digital signal recording for reproducing recorded digital signals
In the recording / playback device, sampling synchronized with the video signal
Generates a clock or a clock with a frequency that is an integer multiple of that
Means and a sampling clock asynchronous to the video signal.
A clock with a frequency that is equal to or
Means and a digital signal synchronized with the video signal.
Sampling clock or a clock with a frequency that is an integer multiple of that
Lock or sampling clock asynchronous to the video signal
Clock or a clock with a frequency that is an integer multiple of
Digital voice signal obtained by quantizing and digitizing voice signal
Means for recording the digital audio signal,
In both cases, digital data recorded in each section
Records a sample number identification signal indicating the number of samples in the audio signal
And the number of samples of the recorded digital audio signal.
A counting section signal indicating a section for counting is added to the video signal.
Synchronized sampling clock or its integral multiple frequency
Means for generating based on a clock having a number;
Means for switching between the section signal and the video frame signal;
The number of samples reproduced together with the digital audio signal
The output of the frequency divider whose frequency division ratio changes according to the value of the identification signal
Phase the frame period of the video signal or its integer ratio period
Depending on the phase synchronization system used for comparison, the sampling clock
Clock with a frequency of
And a sampling clock synchronized with the video signal.
Or a clock having a frequency that is an integral multiple of that and the phase synchronization
Sampling clock obtained by system means or its integer
Switching between clock with double frequency and audio signal playback
Means used for processing and support for reproduced digital audio signals.
Sampling rate asynchronous to video signal
Clock-based and video synchronization
Between when it is based on the sampling clock and when
Means for converting the digital audio signal and the digital audio signal.
The predetermined number is determined according to the value of the generated sample number identification signal.
Of the digital audio signal recorded in each section
Means for generating a section identification signal indicating a difference in the number of samples
Generating the counting section signal based on the section identifying signal.
And means for controlling the composition. [0016] Claims 1 According to the configuration of
Processed by an asynchronous clock that is not synchronized to the
Clock that synchronized the digital audio signal
Resample. At the time of recording, a support synchronized with the video signal is provided.
Sampling clock or a clock with a frequency that is an integer multiple of that
It is recorded for each section of the counting section signal generated based on the lock.
Sample number identification signal indicating the number of samples of the audio signal to be recorded
The signal is recorded, and during playback, the digital
During the playback process of the audio signal, the sampling clock or
Before being reproduced using a clock having a frequency that is an integer multiple of
Recorded at predetermined intervals based on the value of the sample number identification signal
Identification signal indicating the difference in the number of samples of the extracted audio signal
Is generated, and the counting section signal is controlled based on the section identification signal.
I do. Embodiments of the present invention will be described below.
Refer to the drawings for the digital signal recording / reproducing device.
I will explain. Here, a magnetic tape is used as a recording medium.
The following describes the digital tape recorder used as an example.
You. A digitizer showing a first embodiment of the present invention.
A signal signal recording / reproducing apparatus will be described. FIG.
A digital signal recording / reproducing apparatus according to the first embodiment
It is a block diagram showing a structure. In FIG.
Digital audio interface (DI / F) receiver
2 is a digital audio interface receiver
And the output signal of the AD converter (A / D) 3
The first switch for switching between 3 and 3 is an AD converter, and 4 is
Encoder for digital audio signal data, 5 for video signal
Clock for sampling audio signal from horizontal sync signal
, 6 is a crystal oscillator, and 7 is the output clock of PLL5.
Lock, output clock of crystal oscillator 6 and output of VCO 22
A second switch for selecting one of the input clocks, 1
2 is a digital audio interface receiver
1 outputs the bi-phase demodulation clock and the second switch.
A third switch for switching the output clock of the switch 7,
Is the first to divide the output clock of the third switch 12
A counter 9 is provided for counting the count value of the first counter 8 and the video signal.
Signal frame clock to one frame period of video signal
A system for determining the number of samples of a digital audio signal to be recorded.
The sample number discriminator 13 is processed by the encoder 4.
Digital audio signal data and the output of the sample number discriminator 9
Multiplexer for multiplexing the input signal and
A modulator for modulating the output signal of the lexer 13, and 15 is a demodulator
, A demodulator 15 outputs a digital audio signal
A demultiplexer that separates the signal into a sample number identification signal and
18 is a digital audio signal data decoder, 17 is V
A second counter for dividing the output clock of CO22, 2
0 indicates the load pulse of the second counter 17 and the signal of the video signal.
The phase comparator for comparing the phase with the frame clock, 19 is
The sampling rate converter 21 is an output of the phase comparator 20.
A low-pass filter (LPF) for band limiting the force signal, 2
2 is the transmission frequency according to the output signal of the low-pass filter 21
Is controlled, 25 is a sampling rate converter
A DA converter (D / A) for DA-converting the 19 output signals,
Reference numeral 26 denotes the output signal of the sampling rate converter 19.
Digital audio interface signal and send it out
Digital audio interface (DI / F)
Transmitter. First embodiment configured as described above
Operation of a digital signal recording / reproducing device
Will be described below. In this case, recording on a magnetic tape
Video signals and non-video signals
This will be described using an audio signal as an example. At the time of recording, analog input is performed as in the conventional example.
In the case of force, the first switch 2 is connected to the output signal of the AD converter 3.
And the PL selected by the second switch 7
Output clock of L5 or output clock of crystal oscillator 6
At a sampling frequency or an integer multiple of
Using a certain clock, the AD converter 3 converts the analog input signal.
Signal to a digital signal. The first switch 2 is A
The output signal of the D converter 3 is selected, and the third switch 12
The output clock of the crystal oscillator 6 is selected. In the case of digital input, digital
Receiver 1 of DIO interface is bi-phase modulated
The received signal is bi-phase demodulated and digitized.
Audio signal and sampling frequency and its integral multiple
Generate a clock with a wave number. The first switch 2 is
Receiver 1 of digital audio interface outputs
To select the digital audio signal to be
Is the receiver 1 of the digital audio interface
Select the clock to output. Encoder 4 is a third switch
First counter for counting the output clock of switch 12
Output signal of the first switch 2 in response to the count value of the
Digital signal interleave and error correction code
Perform addition, etc. The sample number discriminator 9 includes a first counter 8
And the frame clock of the video signal.
Of the audio signal recorded in one frame cycle of the video signal
The number of samples is determined, and the first counter 8 is loaded (or
Clear) control and the sample number identification signal
The signal is output to the modulator 14 through the multiplexer 13. The multiplexer 13 is controlled by the encoder 4.
Digital audio signal processed and sample number discriminator 9
Is multiplexed with the output signal of The modulator 14 is a multiplex
After performing modulation suitable for recording on the output signal of the
Output to the amplifier, for example, the track format shown in FIG.
L channel signal and R channel signal
Recorded on a separate track on the loop. During normal reproduction, the input signal from the reproduction amplifier
The signal is demodulated by the demodulator 15 and the demultiplexer 1
6 and the digital voice signal and the sample number identification signal.
After being divided into digital audio signals,
Therefore, after receiving error correction and deinterleaving,
It is input to the rate converter 19. Sample rate converter
19 is a sampling clock generated by the VCO 22
From the decoder 18 controlled at the timing of
Digital audio signal output is sampled by PLL5
The timing is converted to the timing of the
And digital audio interface transmitter
Output to the printer 26. The sampling rate conversion method is as follows.
Using the sampling clock generated by the VCO 22
After DA conversion, the sampling clock generated by PLL5
A method of performing A / D conversion using a lock,
Once high frequency is obtained from the generated sampling clock rate
After being converted to the sampling rate of
To convert to the sampling clock rate
available. On the other hand, the sample number identification signal is
Is sent to the server 17. In the second counter 17, the sample
Load control is performed by the number identification signal. That is, sump
Recorded in one frame period indicated by the number identification signal.
Count up to the number of digital audio signal samples
After that, load 0. In the phase comparator 20, the second
Load pulse of counter 17 and frame clock of video signal
And compares the result with the low-pass filter 21.
Output to The signal band-limited by the low-pass filter 21
The signal is input to the VCO 22 and the transmission frequency of the VCO 22 is
Control. Digital audio interface
The transmitter 26 uses the output clock of the PLL 5,
The digital audio signal output by the sample rate converter 19
Signal data to digital audio interface signal
Convert and output. In the DA converter 25, PLL5
The sample rate converter 19 uses the output clock of
Digital audio signal data to be output
You. With the above operation, during recording, the crystal oscillator
Even when recording using the clock, the sample rate
The converter 19 samples the reproduced digital audio signal data.
Output clock synchronized with the PLL5 video.
Digital audio signals to other video
Digital audio signal by clock synchronized with image signal
Between a digital VTR that processes
It can be transmitted using a DIO interface. A digitizer showing a second embodiment of the present invention
A signal signal recording / reproducing apparatus will be described. FIG.
A digital signal recording / reproducing apparatus according to a second embodiment
It is a block diagram showing a structure. In FIG.
Digital audio interface (DI / F) receiver
2 is a digital audio interface receiver
And the output signal of the AD converter (A / D) 3
The first switch for switching between 3 and 3 is an AD converter, and 4 is
Encoder for digital audio signal data, 5 for video signal
Clock for sampling audio signal from horizontal sync signal
PLL, 8 divides the output clock of PLL5
The first counter 9 has a count value of the first counter 8 and
Recording is performed in one frame period by the counting section signal generator 10
A sample number discriminator for determining the number of samples of audio data,
10 is a counting interval signal generator, and 13 is an encoder 4.
Processed digital audio signal data and sample number
A multiplexer for multiplexing the output signal of the differentiator 9;
Are modulators for modulating the output signal of the multiplexer 13, 1
5 is a demodulator, 16 is digital output signal of demodulator 15
Hoaxes to separate audio signal data and sample number identification signals
Multiplexer, 18 is a digital audio signal data deco
, 17 is a second divider for dividing the output clock of PLL5.
The counter 25 converts the output signal of the decoder 18 from DA to DA.
DA converter (D / A) 26 is an output signal of decoder 18.
Signal to a digital audio interface signal
Digital audio interface (DI
/ F). Second embodiment configured as described above
Operation of a digital signal recording / reproducing device
Will be described below. When recording, use analog input
Means that the first switch 2 selects the output signal of the AD converter 3
And a sampling frequency which is an output clock of the PLL5.
Or by using a clock having a frequency that is an integral multiple of
D converter 3 converts analog input signal to digital audio signal
Convert. In the case of digital input, the first switch 2
Digital audio interface receiver 1
Select the digital audio signal to
Receiver 1 of the radio interface performs biphase modulation.
The received and transmitted signal is bi-phase demodulated and digitized.
Output audio signals. At this time, the input digital
The input signal is the same as the video signal as shown in this embodiment.
Processing digital audio signals with a synchronized clock
Input from the device and both are genlocked
And Digital audio interface
The digital audio signal output from the sheaver 1 is shown in FIG.
In synchronization with the phase of the sampling clock of this embodiment.
Is output in the form of Encoder 4 is the output clock of PLL5.
The count value of the first counter 8 that counts the lock
Digital sound which is an output signal of the first switch 2
It performs interleaving of voice signals and addition of error correction codes.
The sample number discriminator 9 calculates the count value of the first counter 8
And the output of the counting section signal generator 10 to compare the video signal
The number of audio signal samples recorded in one frame period of
Decision, load (or clear) system of first counter 8
Control, and multiplex the sample number identification signal.
The signal is output to the modulator 14 through the modulator 13. The counting section signal generator 10 is, for example, as shown in FIG.
As shown in the figure, in the case of the NTSC system,
For example, when sampling at 48Khz, the number of recorded samples
Is 8008 samples in 5 frames, so 5 frames
4 frames out of 1602 samples, 1 frame 1
The 600-sample counting interval signal is
Generated on the basis of the frame clock, and the sample number discriminator 9
Output to The multiplexer 13 is controlled by the encoder 4.
Digital audio signal processed and sample number discriminator 9
Is multiplexed with the output signal of The modulator 14 is a multiplex
After performing modulation suitable for recording on the output signal of the
Output to the amplifier, for example, the track format shown in FIG.
L channel signal and R channel signal
Recorded on a separate track on the loop. During normal reproduction, the input signal from the reproduction amplifier is
The signal is demodulated by the demodulator 15 and the demultiplexer 1
6 and the digital voice signal and the sample number identification signal.
After being divided into digital audio signals,
Therefore, it undergoes error correction and deinterleaving, etc.
25, digital audio interface transformer
It is output to the transmitter 26. On the other hand, the sample number identification signal is
Is sent to the server 17. In the second counter 17, the sample
Load control is performed by the number identification signal. That is, sump
Recorded in one frame period indicated by the number identification signal.
Count up to the number of digital audio signal samples
After that, load 0. The digital audio interface
The transmitter 26 uses the output clock of the PLL 5,
The digital audio signal output from the decoder 18 is converted into a digital signal.
It converts it to audio interface signal and outputs it.
In the DA converter 25, the output clock of the PLL 5 is used.
The digital audio signal data output from the decoder 18.
Is converted into a digital signal and output. By the above operation, the PLL 5 is generated at the time of recording.
Record every frame of video signal using generated clock
The number of digital audio signal data samples
Using a clock generated by the PLL 5 for several section signals
In this way, the reproduction signal processing can be performed by the PLL5.
This can be done using the clock that
Clock that synchronizes audio signal data with other video signals
Digital VT processing digital audio signal by
Use digital audio interface with R
Can be transmitted. Further, the clock generation time on the reproduction side is
No circuit is required, and the number of circuits can be reduced. The third of the present invention
Digital signal recording / reproducing apparatus showing embodiment
explain. FIG. 3 is a data diagram showing a third embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a digital signal recording / reproducing device.
You. As shown in FIG. 3, the configuration of the third embodiment is
A section identification signal generator 27 is added to the configuration of the second embodiment.
This is an added configuration. The third embodiment configured as described above
Operation of a digital signal recording / reproducing device
Will be described below. When recording, use analog input
Means that the first switch 2 selects the output signal of the AD converter 3
And a sampling frequency which is an output clock of the PLL5.
Or by using a clock having a frequency that is an integral multiple of
D converter 3 converts analog input signal to digital audio signal
Convert. In the case of digital input, the first switch
2 is a digital audio interface receiver 1
Select the digital audio signal output by
Audio interface receiver 1 changes bi-phase
The signal transmitted after the modulation is bi-phase demodulated and
Output digital audio signal. At this time,
The input signal is a video signal as shown in the present embodiment.
Digital audio signal is processed by clock synchronized with
And both are genlocked.
Shall be. Digital audio interface
The digital audio signal output from the sheaver 1 is shown in FIG.
In synchronization with the phase of the sampling clock of this embodiment.
Is output in the form of Encoder 4 is the output clock of PLL5.
The count value of the first counter 8 that counts the lock
Digital sound which is an output signal of the first switch 2
It performs interleaving of voice signals and addition of error correction codes.
The sample number discriminator 9 calculates the count value of the first counter 8
And the output of the counting section signal generator 10 to compare the video signal
The number of audio signal samples recorded in one frame period of
Decision, load (or clear) system of first counter 8
Control, and multiplex the sample number identification signal.
The signal is output to the modulator 14 through the modulator 13. The counting section signal generator 10 is, for example, as shown in FIG.
As shown in the figure, in the case of the NTSC system,
For example, when sampling at 48Khz, the number of recorded samples
Is 8008 samples in 5 frames, so 5 frames
4 frames out of 1602 samples, 1 frame 1
The 600-sample counting interval signal is
Generated on the basis of the frame clock, and the sample number discriminator 9
(Hereafter, the repetition of these 5 frames is repeated for 5 frames.)
This is called a frame sequence). The multiplexer 13 is an encoder
Digital audio signal data processed by the
The output signal of the sample number discriminator 9 is multiplexed. The modulator 14 outputs the output signal of the multiplexer 13.
After applying modulation suitable for recording to the signal, output to the recording amplifier
Then, for example, according to the track format shown in FIG.
The L channel signal and the R channel signal are
Recorded on the rack. During normal reproduction, the input signal from the reproduction amplifier is
The signal is demodulated by the demodulator 15 and the demultiplexer 1
6 and the digital voice signal and the sample number identification signal.
After being divided into digital audio signals,
Therefore, it undergoes error correction, deinterleaving, etc.
25, digital audio interface transformer
It is output to the transmitter 26. On the other hand, the sample number identification signal is
To the section 17 and the section identification signal generator 27. Second
In the counter 17, the load control is performed by the sample number identification signal.
I will do it. That is, as indicated by the sample number identification signal.
Of digital audio signals recorded in one frame cycle
After counting up to the number of samples, 0 is loaded. The section identification signal generator 27 receives the input
From the sample number identification signal,
Detected and shown in FIG. 6, a frame of 1600 samples
Generate a section identification signal in which the period is high level, and
Output to the inter-signal generator 10. Digital audio
The interface transmitter 26 outputs the output of the PLL5.
Digital sound output from decoder 18 using clock
Converts voice signal data to digital audio interface signal
And output it. In the DA converter 25, PL
Using the output clock of L5, the data output from the decoder 18 is output.
The digital audio signal is DA-converted and output. At the time of editing, the counting section signal generator 10
Generated from the reproduction signal input from the inter-identification signal generator 27
Using the section identification signal
Count interval signal so that the 5
Generate and output a signal. FIG. 7 shows a block diagram of the counting section signal generator 10.
The figure is shown. In FIG. 7, 50 is a sample number counter,
51 is a 5-frame sequence counter, 52 is 5 frames
The section identification signal is input to the system sequence counter 51.
And 53, a switch for selecting whether or not.
Operation of the counting section signal generator 10 configured as described above
Will be described. The sample number counter 50 has a PLL5 output.
Using the sample clock, the input video frame clock
16 with respect to one falling edge with lock
02 or 1600 clock intervals
The count value is output to the decoder 53. At this time, 1602 counts or 1600
It is a 5-frame sequence that determines whether to count
The 5-frame sequence signal input from the counter 51 is
Perform on the basis. The 5-frame sequence signal is shown in FIG.
As in the section identification signal, one frame is set at the low level for the four-frame section.
This is a high-level signal during the frame section,
The data 50 indicates that the 5-frame sequence signal has a low level.
Hour, count up to 1602
When the signal is high level, it counts up to 1600. The decoder 53 has a sample number counter 50.
The input count value is decoded and the count value shown in FIG.
Generate and output an interim signal. 5 frame sequence count
The monitor 51 uses the input video frame clock to
And generate and output the 5-frame sequence signal
I do. During normal recording, an input from the switch 52
The signal is fixed at a low level and a 5-frame sequence
The counter 51 performs the five-frame sequence in the free run.
Output the output signal. At the time of editing, reproduction signal processing and recording signal processing are performed.
Considering the amount of delay, even if editing is performed, the previous
Switch 52 is turned on so that the
At the timing of delaying the input section identification signal by a certain amount
A 5-frame sequence signal is output. By the above operation, the PLL 5 is generated at the time of recording.
Record every frame of video signal using generated clock
The number of digital audio signal data samples
Uses a signal generated by PLL5 for several sections
To generate the signal processing of the reproduction of the PLL5.
This can be done using the generated clock.
Digital audio signal data synchronized with other video signals.
Digital V that processes digital audio signals
Digital audio interface with TR
Can be used for transmission. Also, counting is performed using the section identification signal at the time of editing.
By generating section signals, text can be edited even if editing is repeated.
It is possible to maintain continuity of 5 frames on the loop.
A digital signal recording and reproducing apparatus according to a fourth embodiment of the present invention.
The raw device will be described. FIG. 4 shows a fourth embodiment of the present invention.
Block representing the configuration of the digital signal recording / reproducing apparatus
It is a lock figure. In FIG. 4, 1 is a digital audio
Receiver of the radio interface (DI / F), 2
Output signal of receiver 1 of digital audio interface
Signal and the output signal of the AD converter (A / D) 3
1st switch, 3 is AD converter, 4 is digital voice
Encoder for signal data, 5 is horizontal sync signal for video signal
To make a clock to sample the audio signal from
L and 12 are digital audio interface
Biphase demodulation clock and PL output from
The third switch for switching the output clock of L5, 8 is
A first clock for dividing the output clock of the third switch 12
Counter 10 is a counting section signal generator, 11 is a video signal generator.
A second switch for selecting a frame clock and a counting section signal;
Switches 9 and 9 are the count value of the first counter 8 and the switch.
11, the frame clock of the video signal selected by
Or, from the counting section signal to one frame cycle of the video signal
A system for determining the number of samples of a digital audio signal to be recorded.
The sample number discriminator 13 is processed by the encoder 4.
Digital audio signal data and the output of the sample number discriminator 9
Multiplexer for multiplexing the input signal and
A modulator for modulating the output signal of the lexer 13, and 15 is a demodulator
, A demodulator 15 outputs a digital audio signal
A demultiplexer that separates the signal into a sample number identification signal and
18 is a digital audio signal data decoder, 17 is V
Output clock of CO22 and clock output by PLL5
The frequency of the output clock of the fifth switch 24 is selected.
The second counter 20 is for loading the second counter 17
Compare the phase between the pulse and the frame clock of the video signal.
19, a sampling rate converter, 21
Is a low-pass filter for band-limiting the output signal of the phase comparator 20.
Filter (LPF), 22 is the output of the low-pass filter 21
VCO 23 whose transmission frequency is controlled by signal
The output of the sampler 18 and the output of the sample rate converter 19 are switched off.
A fourth switch 24 is used to switch the output clock of the VCO 22.
Clock and a fifth switch for selecting a clock output from PLL5.
The switch 25 converts the output signal of the switch 23 from DA to DA.
A DA converter (D / A) 26 is an output signal of the switch 23
Into a digital audio interface signal
Digital audio interface (DI /
F) is a transmitter. The fourth embodiment configured as described above
Operation of a digital signal recording / reproducing device
Will be described below. At the time of recording, another embodiment of the present invention is used.
In the case of the analog input, the first switch 2
Selects the output signal of the AD converter 3 and outputs the
The sampling frequency of a clock or its integral multiple
Using the clock that is the frequency, the AD converter 3
The input signal is converted into a digital signal. The first switch
Switch 2 selects the output signal of the AD converter 3 and outputs the third switch.
The switch 12 selects the output clock of the PLL 5. In the case of digital input, the digital
Receiver 1 of DIO interface is bi-phase modulated
The received signal is bi-phase demodulated and digitized.
Audio signal and sampling frequency and its integral multiple
Generate a clock with a wave number. At this time,
When the digital input signal is
The digital audio signal is processed by the clock synchronized with the signal.
Input from the device to be processed, and
When the genlock is applied to the recorder / reproducer
Indicates that the output digital audio signal is as shown in FIG.
In synchronization with the phase of the sampling clock of the present embodiment.
The first switch 2 outputs the digital
Digit output by receiver 1 of DIO interface
The third switch 12 selects the PLL5
Select the clock to output. The digital input signal to be input is
The digital signal recording / reproducing apparatus of this embodiment is independent of the digital signal recording / reproducing apparatus.
If sent by lock, the digital
The audio generated by receiver 1 of the audio interface
The digital audio signal is output in the original phase and the first switch
Switch 2 is a digital audio interface receiver.
The digital audio signal output from the bar 1 is selected, and the third switch is selected.
Switch 12 is a digital audio interface
The clock output from the sheaver 1 is selected. The encoder 4 outputs the output of the third switch 12
Count value of first counter 8 for counting clocks
Receiving the digital signal which is the output signal of the first switch 2.
Performs audio signal interleaving and error correction code addition.
U. The sample number discriminator 9 includes a first counter 8
Count value and the output of the second switch 11
Comparison with the frame signal of the video signal or video signal
The sample of the audio signal recorded in one frame cycle of the video signal
The number of pulls is determined, and the first counter 8 is loaded (or
Rear) control and the sample number identification signal
The signal is output to the modulator 14 via the multiplexer 13. The counting section signal generator 10 is, for example, shown in FIG.
As shown in the figure, in the case of the NTSC system,
For example, when sampling at 48Khz, the number of recorded samples
Is 8008 samples in 5 frames, so 5 frames
4 frames out of 1602 samples, 1 frame 1
The 600-sample counting interval signal is
The second switch 11
Output to The second switch 11 is connected to the third switch 1
2, the counting interval signal and the video signal
Select the frame clock. The third switch 12 is set to PL
When selecting the L5 output clock, select the counting section signal.
Select digital audio interface receiver
When selecting the clock to output, the video frame clock
Choose a lock. Multiplexer 13 is encoder 4
Digital audio signal processed by
The output signal of the separate device 9 is multiplexed. The modulator 14 outputs the output signal of the multiplexer 13.
After applying modulation suitable for recording to the signal, output to the recording amplifier
Then, for example, according to the track format shown in FIG.
The L channel signal and the R channel signal are
Recorded on the rack. During normal reproduction, the input signal from the reproduction amplifier is
The signal is demodulated by the demodulator 15 and the demultiplexer 1
6 and the digital voice signal and the sample number identification signal.
After being divided into digital audio signals,
Therefore, error correction, deinterleaving, etc.
It is input to the rate converter 19 and the fourth switch 23.
The sample rate converter 19 is generated by the VCO 22
Decoder 18 controlled by clock timing
These digital audio signal outputs are generated by PLL5.
The clock is converted to the timing of the fourth switch 23
Output to On the other hand, the sample number identification signal is
To the section 17 and the section identification signal generator 27. Second mosquito
In the counter 17, the load is controlled by the sample number identification signal
I do. That is, indicated by the sample number identification signal
Sample of digital audio signal recorded in one frame cycle
After counting up to the number of pulls, 0 is loaded. Rank
In the phase comparator 20, the load pulse of the second counter 17
And the frame clock of the video signal.
The result is output to the low-pass filter 21. Low pass fill
The band-limited signal is input to the VCO 22,
The transmission frequency of the VCO 22 is controlled. The section identification signal generator 27 receives the input
From the sample number identification signal,
1600 samples as shown in FIG.
Generates and counts a section identification signal with a high-level period
Output to the section signal generator 10. Fourth switch 23
Is connected to the input sampling rate converter 19 and
Out of the output of the converter 18, a PLL synchronized with the video signal at the time of recording
5 processed using the output clock of FIG.
When reproducing the signal, select the output of the decoder 18 and
Digital audio interface asynchronous to signal
Digit processed using output clock of receiver 1
When playing audio signals, use a sampling rate converter.
19 outputs are selected and output. The fifth switch 24 outputs from the PLL 5
Of the clock output by the VCO 22 and the clock output by the VCO 22
Sometimes uses the output clock of PLL5 that is synchronized with the video signal.
When reproducing the digital audio signal processed by
Select the output clock of L5, and select a clock asynchronous with the video signal.
Output of receiver 1 of digital audio interface
Reproduce digital audio signal processed using lock
The output of the VCO 22 is selected and output. The digital audio interface
The transmitter 26 uses the output clock of the PLL 5,
The digital audio signal data output from the fourth switch 23
Data to digital audio interface signals.
Output. In the DA converter 25, the output of the PLL5 is output.
The clock output from the fourth switch 23
The digital audio signal data is DA-converted and output. At the time of editing, the third embodiment of the present invention is described.
As described above, the counting interval signal generator 10 generates
Generated from the reproduction signal input from the separate signal generator 27
Even when editing using the section identification signal,
Count interval signal so that 5 frame sequence is continuous
Generate and output. With the above operation, the reproduction clock is reproduced at the time of reproduction.
Clock, the clock for recording is synchronized with the video signal.
Other digital audio signals, regardless of whether
Digital audio by a clock synchronized with the video signal
Digital VTR for processing signals
It can be transmitted using an audio interface. Also, when editing, the section identification signal is used to calculate
By generating several section signals, even if editing is repeated
It is possible to maintain continuity of 5 frames on tape
And after-recording one channel
Also, the number of samples does not differ between channels. The digital data indicating each of the above embodiments is
In the signal recording / reproducing device, the signal to be recorded on the magnetic tape
The video signal and the audio signal as a signal other than the video signal.
The explanation above is an example, but other signals other than video signals
Transmission of various types of information as characters, such as letters
Information signals for displaying information and recording on magnetic tape
Control signals for controlling the display of recorded information such as contents
Any of them can be used and can be similarly implemented. As described above, according to the present invention, the video signal
Processed by an asynchronous clock that is not synchronized to
Digital audio signal converted to clock synchronized with video signal
Therefore, resampling can be performed. Therefore, a clock asynchronous with the video signal is used.
Digital video processing digital audio signal
A tape recorder and a clock synchronized with the video signal
Digital video data processing digital audio signals
Digital audio signals are mutually transmitted to and from the precoder
can do. At the time of recording, a synchronizing signal
Sampling clock or a clock with a frequency that is an integer multiple of that
It is recorded for each section of the counting section signal generated based on the lock.
Sample number identification signal indicating the number of samples of the audio signal to be recorded
The signal is recorded, and during playback, the digital
During the playback process of the audio signal, the sampling clock or
Before being reproduced using a clock having a frequency that is an integer multiple of
Recorded at predetermined intervals based on the value of the sample number identification signal
Identification signal indicating the difference in the number of samples of the extracted audio signal
Is generated, and the counting section signal is controlled based on the section identification signal.
can do. Therefore, no matter how editing is performed,
No matter how many times the editing is repeated, the number of samples per frame
Continuity of frame by controlling to always be the same
Can keep a one-channel after-recording
During sampling, always keep the number of samples the same between channels.
Can be

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a digital signal recording / reproducing apparatus according to a first embodiment of the present invention. FIG. 2 is a block diagram of a digital signal recording / reproducing apparatus according to a second embodiment of the present invention. FIG. 3 is a block diagram of a digital signal recording and reproducing apparatus according to a third embodiment of the present invention. FIG. 4 is a block diagram of a digital signal recording and reproducing apparatus according to a fourth embodiment of the present invention. FIG. 6 is a time chart of digital audio signal input according to the second, third, and fourth embodiments of the invention. FIG. 6 is a time chart of a counting section signal and a section identification signal according to the embodiment. FIG. 8 is a block diagram of a counting section signal generator according to a third embodiment. FIG. 8 is a block diagram of a conventional digital audio signal recording / reproducing apparatus. FIG. 9 is a track pattern diagram on a magnetic tape used in a digital VTR. [Description of Signs] 3 AD converter (A / D) 5 PLL 6 Crystal oscillator 9 Sample number discriminator 10 Count section signal generator 11 Second switch 19 Sampling rate converter 20 Phase comparator 21 Low-pass filter (LPF) Reference Signs List 22 VCO 23 Fourth switch 24 Fifth switch 25 DA converter (D / A) 27 Section identification signal generator

Continuation of the front page (56) References JP-A-5-234253 (JP, A) JP-A-7-23341 (JP, A) JP-A-4-208782 (JP, A) JP-A-3-153138 (JP) , A) JP-A-1-189907 (JP, A) JP-A-1-119127 (JP, A) JP-A-6-302106 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB G11B 20/10-20/16 351 H04N 5/91-5/92

Claims (1)

(1) A digital signal recording / reproducing apparatus for recording a digital signal corresponding to a video and audio analog signal on a recording medium and reproducing the digital signal recorded on the recording medium. , A sampling clock synchronized with the video signal or a clock having a frequency that is an integer multiple thereof.
Means for generating the clock and sampling asynchronous to the video signal
Generates a clock or a clock with a frequency that is an integer multiple of that
Means for synchronizing with video signals as digital signals
Sampled clock or its integral multiple frequency
Clock or asynchronous sampling to video signal
Clock or a clock with a frequency that is an integral multiple of the clock.
Digital signal obtained by quantizing the audio signal and digitizing it .
And means for recording the audio signal, the digital audio signal
Along with recording, for each predetermined section,
Sample number identification signal indicating the number of samples of the digital audio signal
Means for recording the digital audio signal,
The counting section signal indicating the section for counting the number of pulls is output from the video
Sampling clock synchronized with the signal or its integer multiple
Means for generating based on a clock having a frequency of
Means for switching between a counting section signal and a video frame signal
And the sound reproduced with the digital audio signal.
The frequency divider whose frequency division ratio changes according to the value of the pull number identification signal
The frame period of the output and video signal or its integer ratio period
Sampling by the phase synchronization system means
Generates a clock or a clock with a frequency that is an integer multiple of the clock.
Means for generated a clock and the position with the sampling clock or the frequency of an integral multiple synchronized with the video signal
The sampling clock obtained by the phase synchronization
Switch to a clock with a frequency that is an integer multiple of
Means used for signal reproduction processing, and a case where the sampling rate of the reproduced digital audio signal is based on a sampling clock that is asynchronous with the video signal, and based on a sampling clock synchronized with the video signal. Means for rate conversion between the digital audio signal and
According to the value of the sample number identification signal reproduced together,
Digital sound recorded in each section for each of the predetermined sections
Generate an interval identification signal indicating the difference in the number of voice signal samples
Means for counting the interval signal based on the interval identification signal.
And a means for controlling generation of a signal.