JPH09182014A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the power that is required for reproduction of a tilted track in an insert recording mode by recording an ID that identifies the fields forming a 5-field sequence on a longitudinal track of a magnetic tape. SOLUTION: The sampling data on voices acquired by the sampling frequency Fs=48kHz are allocated to 5 fields where the video data consisting of the field frequency Fv=60×1000/1001Hz are continuous in the sequential 800, 801, 801, 801 and 801 samples. Thus the 5-field sequence recording is performed on a tilted track of a magnetic tape 121. A fixed head 5 records the ID data in a recording mode to identify every field of a 5-field sequence on a longitudinal track of the tape 121. In an insert recording mode, the head 5 reads out the sequence information on the fields recorded on the longitudinal track and sends the sequence information to an MPU 8 via an ID generation circuit 6 to select the 800 or 801 sample.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus suitable for application to, for example, a portable digital video tape recorder or a camera-integrated digital video tape recorder.

[0002]

2. Description of the Related Art Conventionally, as a digital video tape recorder, for example, one shown in FIG. 3 has been proposed.

FIG. 3A shows a digital video tape.
FIG. 3B is a configuration diagram showing a configuration example of the rotary drum scanner 100 of the recorder, and FIG. 3B is a rotary drum scanner 1 shown in FIG. 3A.
It is a block diagram which shows the structural example of the digital video tape recorder which mounts 00.

The rotary drum scanner 100 shown in FIG. 3A.
Is a rotary drum 100 including a lower drum and an upper drum.
And the reproduction confidence heads CHa, CHb, CHc and CH mounted on the rotary drum 100.
d, DT heads DTa and DTb, recording head RH
a, RHb, RHc and RHd, advanced for playback
It is composed of heads AHa, AHb, AHc and AHd.

Here, the DT heads DTa and DT
b, and advanced heads AHa to AHd for reproduction
Is a head for performing so-called dynamic tracking (DT) in which the recording tracks on the magnetic tape are accurately scanned by being moved up and down in the height direction of the rotary drum by piezoelectric elements.

The digital video tape recorder shown in FIG. 3B comprises a video recording processing system, an audio recording processing system, a recording system, a video reproduction processing system, an audio reproduction processing system and a reproduction system.

[Structure of Video Recording Processing System] The video recording processing system is an input circuit for digitizing an input analog video signal from the analog video input terminal 101 and taking in an input digital video signal from the digital video input terminal 102. 103, digital video data from the input circuit 103 is converted to DCT (Discrete Cosig).
n Transform) processing, for example, 8 × 8
A block formation circuit 104 for dividing into pixel-based blocks,
A field shuffling circuit 105 for shuffling the block unit data from the blocking circuit 104 in a field, and DCT processing, quantization processing, variable length coding processing for digital video data from the field shuffling circuit 105. The bit rate reduction circuit 106 that sequentially applies the compressed digital data from the bit rate reduction circuit 106 to the outer ECC (Erro
r ECC (Collection Code) and adds the outer ECC to the compressed digital data, and an outer ECC coder 107.

[Configuration of Audio Recording Processing System] The audio recording processing system converts an input analog audio signal from the analog audio input terminal 109 into digital data by sampling it with a clock signal having a sampling frequency of 48 KHz, for example. , Digital audio input terminal 11
An input circuit 111 for taking in 48 KHz input digital audio data from 0, a shuffling circuit 112 for shuffling the digital audio data from the input circuit 111, and an outer ECC for the digital audio data from the shuffling circuit 112,
The outer ECC coder 113 adds the outer ECC to the compressed digital data, and the field shuffling circuit 114 that shuffles the digital data from the outer ECC coder 113 in the field.

[Structure of Recording System] The recording system is an outer EC
Digital data including digital video data from the C coder 107 and the field shuffling circuit 11
A multiplexer 108 for selectively outputting the digital data including the digital audio data from 4 to convert the outputs of the two systems of the video recording processing system and the audio recording processing system into one system, and this multiplexer 10.
Of the digital data from 8, the video digital data is added with the video ID data, and the voice digital data is added with the voice ID data.
An inner ECC is generated for the D addition circuit 115 and the scramble circuit 116 that scrambles the digital data to which the ID data is added by the ID addition circuit 115, and the scrambled digital data from the scramble circuit 116. Then, the inner ECC coder 117 for adding the inner ECC to the digital data and the inner ECC coder 1
A sync addition circuit 118 for adding vertical and horizontal sync signals to the digital data from the digital data 17 and a partial signal for the digital data from the sync addition circuit 118.
It is composed of a coder 119 which performs a Viterbi coding process according to response and class 4, and a recording head 120 which records the output from the coder 119 on the magnetic tape 121 so as to form inclined tracks.

[Structure of Playback System] The video playback processing system is a playback head 1 for playing back a recording signal from the magnetic tape 21.
22, a decoder 123 for decoding the reproduction data reproduced by the reproduction head 122, and the decoder 1
23. A sync detection circuit 124 for extracting a sync signal from digital data from 23, and an inner error correction circuit for performing error detection and correction processing on the digital data from this sync detection circuit 124 by an inner ECC in the digital data. 125, an ID detection circuit 126 for extracting ID data from the digital data from the inner error correction circuit 125, and the ID detection circuit 12
Descramble circuit 127 for converting the digital data from 6 to the original data string by performing descramble processing, and this descramble circuit 1
It is composed of a de-multiplexer 128 which selectively outputs the digital data from 27 to the video system and the audio system.

[Structure of Audio Playback Processing System] The audio playback processing system is a field de shuffling circuit 129 for performing deshuffling processing for each field on the audio digital data from the demultiplexer 128.
And an outer error correction circuit 130 for extracting an outer ECC from the digital audio data from the field de shuffling circuit 129 and performing error detection and correction processing on the digital audio data by the outer ECC, and the outer error correction circuit 130. Deshuffling processing is performed on the digital audio data from the error correction circuit 130. Of the digital audio data from the deshuffling circuit 131 and the deshuffling circuit 131, data to which an error flag is added is added. ,
The error correction circuit 132 that performs error correction processing and the digital audio data from the error correction circuit 132 are
It is converted into an analog audio image signal and the analog audio signal is output from the analog audio output terminal 134.
The output circuit 133 is configured to output the digital audio data from the digital audio output terminal 135.

[Structure of Audio Reproduction Processing System] The audio reproduction processing system extracts an outer ECC from the audio digital data from the demultiplexer 128, and performs error detection and correction processing on the digital data by the outer ECC. The outer error correction circuit 136 for performing the decompression and the digital data from the outer error correction circuit 136 are subjected to decompression processing, that is, variable length code decoding processing, dequantization processing, and IDCT (Inverse Discr).
inverse bit rate reduction circuit 137 for sequentially performing ete Coordinate Transform) processing
And a field de shuffling circuit 138 for subjecting the digital data from the inverse bit rate reduction circuit 137 to deshuffling processing in the field, and digital video data from the field deshuffling circuit 138. Error correction circuit 139 that performs error correction processing on digital video data to which an error flag has been added, and digital video data from this error correction circuit 139 is converted into an analog video image signal, and the analog video image signal is converted. Video signal,
The digital video data is output from the analog video output terminal 141 and the digital video data is output from the digital video output terminal 14
2 and an output circuit 140 for outputting.

The recording head 120 shown in FIG.
Corresponding to the recording heads RHa to RHd shown in FIG. 3, the reproducing head 122 is the DT head DTa shown in FIG. 3A.
And DTb, playback advanced heads AHa to AH
d, corresponding to confidence heads CHa to CHd for reproduction.

During normal reproduction, the recording heads formed on the magnetic tape 21 are sequentially scanned by the reproduction confidence heads CHa to CHd. When so-called pre-reproduction is performed, for example, a recording signal is reproduced from the magnetic tape 21, and the reproduction signal is subjected to processing such as addition of character data and special effect processing, and the processed signal. However, in the case where the original recording track is overwritten, the following occurs. That is, the advance heads AHa to A
The recorded signal is reproduced by Hd, and with respect to the reproduced signal,
After the above-described processing is performed, the processed signal is recorded at the original recording position by the recording heads RHa to RHd.

[Operation During Recording] Digital video data from the input circuit 103 is divided into blocks of, for example, 8 × 8 pixels in the blocking circuit 104. The digital video data from the blocking circuit 104 is supplied to the field shuffling circuit 105, and the field shuffling circuit 105 performs shuffling processing within the field. This field shuffling circuit 10
The digital data from 5 is supplied to the bit rate reduction circuit 106, first subjected to DCT processing to be converted into coefficient data from a DC component to a high-order AC component, and then subjected to quantization processing, Finally, variable length coding processing is performed by the run length or Huffman method. The digital data from the bit rate reduction circuit 106 is supplied to the outer ECC coder 107, the outer ECC coder 107 adds the outer ECC generated based on the digital video data, and then supplied to the multiplexer 108. To be done.

On the other hand, the digital audio data from the input circuit 111 is supplied to the shuffling circuit 112 and shuffled. This shuffling circuit 11
The digital voice data from 2 is supplied to the outer ECC coder 113, and the outer ECC coder 113
At, the outer ECC generated based on the digital audio data is added. The digital data from the outer ECC coder 113 is supplied to the field shuffling circuit 114, and the field shuffling circuit 114 performs shuffling processing in the field and then the multiplexer 108.
Is supplied to.

The video system digital data and the audio system digital data supplied to the multiplexer 108 are subjected to selective output processing of the multiplexer 108.
Converted to digital data of one system. The digital data from the multiplexer 108 is supplied to the ID adding circuit 115, and the ID adding circuit 115 outputs I
D data is added. The digital data from the ID adding circuit 115 is scrambled by the scramble circuit 116. This scramble circuit 1
The digital data from 16 is supplied to the inner ECC coder 117, and the inner ECC generated based on the digital data is added. Digital data from the inner ECC coder 117 is transferred to the synchronization adding circuit 118.
At, horizontal and vertical sync signals are added. The digital data from the synchronization adding circuit 118 is supplied to the recording head 120 after being subjected to the partial response and the Viterbi encoding processing by the class 4 in the coder 119, and the recording head 120 causes the magnetic tape 121 to be supplied.
It is recorded to form a tilted track on top.

[Operation During Reproduction] The recording signal recorded so as to form an inclined track on the magnetic tape 121 is reproduced by the reproducing head 122. This reproduction signal is supplied to the decoder 123, and is decoded in this decoder 123. The decoded digital data is supplied to the sync detection circuit 124, and the horizontal and vertical sync signals are extracted. The digital data from the synchronization detection circuit 124 is supplied to the inner error correction circuit 125, and error detection and correction processing is performed by the added inner ECC. Inner error correction circuit 12
5 is supplied to the ID detection circuit 126, where the video ID data and the audio ID are supplied.
Data is extracted. The digital data from the ID detection circuit 126 is descrambled by the descramble circuit 127 and then supplied to the demultiplexer 128.

Of the digital data supplied to the demultiplexer 128, audio digital data is supplied to the field de shuffling circuit 129, and video digital data is supplied to the outer error correction circuit 136. In the field de shuffling circuit 129, audio system digital data is subjected to deshuffling processing in the field. The digital data from the field de shuffling circuit 129 is subjected to error detection and correction processing by the added outer ECC in the outer error correction circuit 130. The digital audio data from the outer error correction circuit 130 is sent to the de-shuffling circuit 13
In 1, the de-shuffling process is performed. Among the digital audio data from the de-shuffling circuit 131, the digital audio data to which the error flag is added is subjected to error correction processing in the error correction circuit 132. The digital audio data from the error correction circuit 132 is output from the digital audio output terminal 135 by the output circuit 133, converted into an analog audio signal, and output from the analog audio output terminal 134.

On the other hand, of the digital data supplied to the demultiplexer 128, the video system digital data is supplied to the outer error correction circuit 136. Then, in this outer error correction circuit 136, error detection and correction processing is performed by the added outer ECC. The digital video data from the outer error correction circuit 136 is supplied to the reverse bit rate reduction circuit 137. Then, in the inverse bit rate reduction circuit 137, variable length code decoding processing, inverse quantization processing, and IDCT processing are performed. The digital video data from the inverse bit rate reduction circuit 137 is supplied to the field deshuffling circuit 138 and subjected to deshuffling processing. Of the digital video data from the field de shuffling circuit 138, the digital video data to which the error flag is added is subjected to error correction processing in the error correction circuit 139.
The digital video data from the error correction circuit 139 is output to the digital video output terminal 1 by the output circuit 140.
Along with being output from 42, it is converted into an analog video signal and output from the analog video output terminal 141.

[Tape Format] Next, the tape format of the digital video tape recorder shown in FIG. 3 will be described with reference to FIG. FIG.
It is explanatory drawing which shows an example of the tape format of the digital video tape recorder shown in FIG.

As shown in FIG. 4, the magnetic tape 121 is
The recording head 120 and the reproducing head 122 shown in FIG. 3B are driven in the direction indicated by the arrow x, and scan the recording tracks Ta to Td in the direction indicated by the arrow y. The recording tracks Ta to Td correspond to the recording heads RHa to RH shown in FIG. 3A.
It is formed on the magnetic tape 121 by d. In the present embodiment, one field of video and audio data includes six recording tracks Ta to Td, Ta and T.
It is recorded on the magnetic tape 121 so as to form d. One recording track has two upper and lower video areas V1.
And V2, and four voice areas A1 to A4. Then, the recording heads RHa and RH shown in FIG. 3A
The timing signal is recorded between the video area V1 and the audio area A1 and the pilot signal is recorded between the audio area A4 and the video area V2 only on the recording track formed by c. In addition, a cue audio track Tca is formed on the upper part of the magnetic tape 121, and a cue sound track Tca is formed on the lower part.
Control track Tc and time code track T
tc is formed respectively.

[0023]

By the way, for example, NT
In the SC system, the audio sampling frequency is 48
In the case of KHz, the relationship between the number of audio data samples and the field frequency is as follows. here,
The field frequency is Fv, and the audio sampling frequency is Fs.

Fv = 60 × (1000/1001) (KHz) Fs = 48 (KHz) Therefore, 5 × (1 / Fv) = 4004 × (1 / Fs)

That is, the number of fields in which the number of samples of the audio data is exactly set is 5 fields. This is generally called a 5-field sequence or the like.

Next, referring to FIG. 5, when the video and audio data is recorded by, for example, an insert or the like on the magnetic tape 121 on which the audio data is recorded and the above-mentioned 5 field sequence is observed. Explain the problem.

As shown in FIG. 5A, 4004 samples of audio data are recorded in 5 fields. That is, in the first of the five fields, 800
Audio data of a sample is recorded, and audio data of 801 samples is recorded in each of the other four fields.

On the magnetic tape 121 in the recording state as shown in FIG. 5A, the IN point IP and the OUT point OP are designated, and from the outside between the IN point IP and the OUT point OP on the magnetic tape 121. It is assumed that video and audio data will be recorded. In the example shown in FIG. 5B, the number of samples of audio data in the video and audio data for 5 fields supplied from the outside is 4 from the first field.
In the fields up to the th, there are 801 samples each, and in the fifth field, there are 800 samples. This is because when audio data supplied from the outside is recorded by the audio recording processing system shown in FIG.
This is because the processing is performed separately from the 5-field sequence formed in 1 above.

Therefore, after insert recording, as shown in FIG. 5C, the corresponding portion of the magnetic tape 121 is only the portion corresponding to the insert period, and the number of samples of each audio data in the first to fourth fields is 801, The number of audio data samples in the fifth field is 800.

Here, the magnetic tape 121 shown in FIG. 5A.
5C, the number of audio data samples at the corresponding positions during the insert period before insert recording is compared with the number of audio data samples at the corresponding positions during the insert period after insert recording shown in FIG. 5C. As shown in FIG. 5A, the number of audio data samples is 800 at the corresponding position of the leading field of the insert period before insert recording on the magnetic tape 121.
On the other hand, as shown in FIG. 5C, the number of audio data samples is 801 at the corresponding position of the first field of the insert period after insert recording on the magnetic tape 121. In other words, the voice data is
The audio data corresponding to 801 samples is recorded in the portion where only 800 samples are recorded.

In the recording system shown in FIG. 3, in the first 1 field of the 5 field sequence,
Since the audio data is processed for 800 samples,
The 801st audio data is not processed and is not recorded on the magnetic tape 121. Therefore, at the time of reproduction, since the audio data that should originally exist is output in a state of being missing, as shown in FIG. 5D, the area before and after the audio data missing position becomes noise in terms of hearing.

As shown in FIG. 5A, the magnetic tape 1
At the position corresponding to the fifth field in the insert period before insert recording on No. 21, the number of audio data samples is 801. On the other hand, as shown in FIG. 5C, at the corresponding position of the fifth field of the insert period after insert recording on the magnetic tape 121, the number of samples of audio data is 80.
It is 0. That is, 800 samples of audio data are recorded in the area where 801 samples of audio data are recorded.

In the recording system shown in FIG. 3, in the fifth field of the 5-field sequence,
Although the 801st audio data is not supplied although the audio data is processed for 801 samples, the 801st audio data is the magnetic tape 121.
Not even recorded above. However, at the time of reproduction, the reproduction period of the 801st audio data in which the audio data does not exist becomes the actual reproduction period.
As shown in D, the noise before and after the reproduction period in which the audio data does not exist is audible.

Therefore, conventionally, the reproduction confidence heads CHa to CHd shown in FIG. 3A reproduce the ID data in the audio data recorded on the magnetic tape 121, and input the ID data. The ID data in the video and audio data is processed so as to be continuous. Specifically, confidence heads CHa to CHd
The value of the ID data of the video data recorded at the position of the IN point IP on the magnetic tape 121 is obtained from the value of the ID data of the audio data read by the. The ID data that is continuous with the value of the ID data of the audio data recorded at the position is generated, and the input audio data is processed so that the number of samples corresponds to the value of the ID data.

According to this method, for example, the magnetic tape 12
When the value of the ID data of the audio data recorded at the position corresponding to the in-point IP on 1 is, for example, "0" and the number of samples is "800", the audio recording processing system is configured as confidence heads CHa to CHd. From the playback ID data from
The ID data “0” of the audio data recorded at the corresponding position of the IN point IP is calculated, and then the value “1” of the ID data to be added to the input audio data is calculated. The processing is performed so that the calculated value becomes the number of samples (“801”) corresponding to the ID data of “1”. That is, the recording process is performed in synchronization with the confidence heads CHa to CHd. Therefore, the magnetic tape 121
From the position of the upper IN point IP, 800, 801, 801,
Input video data for 801 and 801 samples are sequentially recorded. Therefore, the input video and audio data is recorded in the state where the so-called 5-field sequence is maintained.

On the other hand, commercial portable video tape recorders, camera-integrated digital video tape recorders, and the like are often used outdoors, and therefore, most of them use a battery as a power source. There is. As a matter of course, when the battery is used, the usage time of the device is limited. Conventionally, in order to solve such a problem, a method called power control has been adopted. This power control controls power supply to the reproducing system at the time of recording, thereby suppressing power consumption and extending the operating time of the device.

In a video tape recorder equipped with this power control function, as described above,
It is not possible to perform the process for maintaining the 5-field sequence using the ID data of the audio data reproduced by the confidence heads CHa to CHd. This is because, as described above, in a video tape recorder equipped with a power control function, no power is supplied to the reproducing system during recording.

The present invention has been made in consideration of the above point, and a recording / reproducing apparatus capable of maintaining a 5-field sequence even in a video tape recorder having a power control function is provided. It is a proposal.

[0039]

DISCLOSURE OF THE INVENTION The present invention relates to a recording system for recording video and audio information so as to form a slanted track on a recording medium, and a recording system corresponding to the video and audio information. Identification information for recording reproduction identification information by recording free-running identification information having continuous and circulating values so as to form a longitudinal track, and reproducing the identification information recorded on the recording medium. Recording / reproducing means, when recording input video and audio information, the reproduction identification information is supplied to the recording system, and at the same time, identification information generating means for generating the free-running identification information, and the reproduction identification information, A table consisting of subtraction means for calculating the difference with the free-running identification information, and a plurality of difference values and information corresponding to the plurality of difference values and indicating the synchronization signals used in the recording system having different phases respectively; , Above Timing generating means for respectively generating different synchronizing signals and a synchronizing signal corresponding to the difference value from the subtracting means are recognized by referring to the table, and based on the recognition, the timing generating means And a control means for providing a control signal indicating one of the synchronization signals having different phases generated by the timing generation means.

According to the present invention described above, the reproduction identification information from the recording / reproduction system is delayed by the processing time and supplied to the recording system, and the difference between the reproduction identification information and the free-running identification information is dealt with. By applying the synchronization signal to the recording system,
As a result, the operation of the recording system is locked with respect to the identification information on the recording medium, and the input video and audio information is recorded while maintaining the continuity of the identification information recorded on the recording medium. .

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to FIG. 1 and FIG.

In the description of the embodiment of the recording / reproducing apparatus of the present invention, the following item explanation will be described at the head of each item, and each item will be explained in the following order.

A. Description of Configuration of Main Part of Recording / Reproducing Device (FIG. 1) B. Explanation of the timing of the main part of the recording / reproducing apparatus shown in FIG. 1 (FIG. 2)

A. Description of the configuration of the main part of the recording / reproducing apparatus (Fig. 1)

[Connection and Configuration] FIG. 1 is a configuration diagram and an explanatory diagram for explaining the configuration and operation of a main part of the recording / reproducing apparatus. 1A is a configuration diagram of a main part of the recording / reproducing apparatus, and FIG. 1B is an explanatory diagram for explaining a vertical synchronizing signal output from the timing generation circuit shown in FIG. 1A.
FIG. 1C is an explanatory diagram for explaining the contents of the table of the recording / reproducing apparatus shown in FIG. 1A.

The structure of the recording / reproducing apparatus shown in FIG. 1A is the same as that of the digital video tape recorder shown in FIG.

The main parts of the recording / reproducing apparatus shown in FIG. 1A are a servo circuit 1, amplification circuits 2 and 4, a capstan
Motor 3, CTL head 5, ID generation circuit 6, subtraction circuit 7, MPU 8, table 9, timing generation circuit 10,
It is composed of a crystal oscillator 11 and a switch 14.

During normal recording, the servo circuit 1 outputs a capstan drive signal for driving the capstan motor 3 and an image from the ID generation circuit 6 based on the color frame signal from the timing generation circuit 10. And the CTL signal including the voice ID data.

Then, the servo circuit 1 makes the CTL reproduced from the magnetic tape 121 during the insert recording.
The voice ID data (reproduction identification information) in the signal (this is referred to as first voice ID data ID1) is extracted, and the first voice ID data ID1 is output to the ID generation circuit 6
To supply. In this example, since the video tape recorder with the above-described power control function is premised, the confidence area is used at the time of insert recording or the like, and the audio area A1 already described is used.
The audio ID data cannot be reproduced from A4. Therefore, in this example, the audio ID data recorded on the control track Tc shown in FIG. 5 is reproduced by the CTL head. Audio ID data is recorded on the control track Tc, and its value is incremented for each field.

The amplifier circuit 2 amplifies the capstan drive signal from the servo circuit 1. Capstan motor 3
Is driven by a capstan drive signal from the amplifier circuit 2, and the magnetic tape 121 is run by a capstan and a pinch roller (not shown). The amplifier circuit 4 current-amplifies the CTL signal from the servo circuit 1 for recording and amplifies the reproduced CTL signal from the CTL head 5. The CTL head 5 records the CTL signal from the servo circuit 1 on the magnetic tape 121 during recording, and C recorded on the magnetic tape 121 during reproduction.
The TL signal is reproduced.

During normal recording, the ID generation circuit 6 generates ID data for video and audio by self-running,
ID data (self-propelled identification information) for the video and audio,
The ID data for audio is supplied to the servo circuit 1 while being supplied to the recording system shown in FIG. 4 via the output terminal 16. The ID data supplied to the servo circuit 1 is superposed on the CTL signal generated by the servo circuit 1 and then supplied to the fixed head 5 via the amplifier circuit 4, and the magnetic tape 1 is supplied.
21 is recorded in the longitudinal direction. The video and audio ID data is also data that is embedded in the video and audio data and is recorded together with the video and audio data so as to form an inclined track, and the ID adding circuit 115 shown in FIG. , Added to video and audio data.

The ID data for voice is a processing flag in the recording system, that is, 800 samples or 8
It is also control information for instructing whether to use 01 sample. The ID data for voice is used in a circuit for setting the number of samples of voice data in the recording system, for example, the input circuit 111 and the shuffling circuit 112. Input circuit 11
1 processes the input voice data in units of 800 or 801 samples based on the value of the ID data. The same applies to the shuffling circuit 112.

The voice ID data supplied to the servo circuit 1 is supplied to the fixed head 5 via the amplifier circuit 4,
Recording is performed by the fixed head 5 so as to form a longitudinal track on the magnetic tape 121. Hereinafter, the voice ID data generated by this self-propelling will be referred to as “third ID data”.

Further, the ID generating circuit 6 records the input video and audio data from an arbitrary position on the magnetic tape on which the video and audio data has already been recorded for a predetermined period. At the time of insert recording. , Magnetic tape 12
The audio ID data reproduced from 1 and supplied through the servo circuit 1 is delayed by the delay time based on the signal transmission time, and the ID data is supplied to the recording system shown in FIG. .

Hereinafter, the audio ID data reproduced from the magnetic tape 121 will be referred to as "first ID data", the first ID data.
ID data delayed from the ID data of
Data ".

Here, the second ID data ID2 is incorporated in the audio data. Then, the video data in which the video ID data is incorporated and the audio data in which the ID data ID2 is incorporated are recorded so as to form an inclined track. The ID data is added by the ID adding circuit 115 shown in FIG.

The ID data ID2 is a processing flag in the recording system, that is, 800 samples or 80
This is control information for instructing whether to make one sample, and is used in a circuit that sets the number of samples of audio data in the recording system, for example, the input circuit 111 and the shuffling circuit 112. The input circuit 111 processes the input voice data in units of 800 or 801 samples based on the value of the ID data ID2. Shuffling circuit 11
2 is the same. Further, the ID generation circuit 6 receives the first voice ID data ID1 from the servo circuit 1 and the third voice ID data ID3 from the timing generation circuit 10.
It is supplied to the subtraction circuit 7.

The subtracting circuit 7 obtains the difference between the first voice ID data ID1 and the third voice ID data ID3 supplied from the ID generating circuit 6, and supplies the difference data to the MPU 8. . The MPU 8 uses the difference data from the subtraction circuit 7 as an index from the table 9
Read the switching data indicating the connection contact of the switch 14,
A switching control signal is generated based on the switching data, and the switching control signal is supplied to the switch 14.

The timing generation circuit 10 includes a crystal oscillator 1
The oscillation signal obtained from 1 is used as a clock signal to generate a color frame signal and horizontal and vertical synchronizing signals serving as a reference, and the horizontal synchronizing signal is output via the output terminal 12.
The vertical synchronizing signal is output via the output terminal 13. Further, as shown in FIG. 1B, the timing generation circuit 10 is
At the time of insert recording, four vertical synchronizing signals delayed by 1/5, 2/5, 3/5 and 4/5 of one cycle of the sampling clock signal of audio data with respect to the reference vertical synchronizing signal VDa. VDb, VDc, VDd and VDe are generated respectively. Below, these vertical synchronizing signals are shifted by 0 (Fs) (reference), 1/5 (Fs),
It is called a vertical synchronization signal of 2/5 (Fs), 3/5 (Fs), and 4/5 (Fs). In addition, the timing generation circuit 10
Generates ID data ID3 for the third audio in addition to the ID data for the video, and outputs the third ID data ID for the audio.
3 is supplied to the ID generation circuit 6.

Then, the timing generating circuit 10 supplies the reference vertical synchronizing signal and the above four vertical synchronizing signals to the switch 14, respectively. That is, the first of the switch 14,
The second, third, fourth, and fifth fixed contacts a, b, c, d, and e have shift amounts of 0 (Fs) and 1/5 (F), respectively.
s), 2/5 (Fs), 3/5 (Fs) and 4/5 (F
The vertical synchronization signal of s) is supplied. These vertical synchronizing signals are selectively output from the output terminal 15 by the switching control signal supplied from the MPU 8 and are supplied as reference signals to the respective circuits of the recording system shown in FIG.

Now, the contents of the table 9 will be described with reference to FIG. 1C. The table 9 is composed of data stored in, for example, a ROM, and is referred to by the MPU 8 during insert recording operation. As shown in FIG. 1B, the contents of the table 9 are composed of a difference value and switching data indicating a contact of the switch 14 to be connected.
Incidentally, the "shift amount" shown in the center is shown for the sake of easy understanding of the explanation, and is not the content of the table 9. That is, the shift amount according to the difference value is shown.

The difference value is obtained by the subtraction circuit 7 shown in FIG. 1A.
It corresponds to the difference data obtained in. That is, MPU8
If the value of the difference data supplied from the subtraction circuit 7 is "0", the switching data indicating the fixed contact a corresponding to the difference value "0" in this table 9 is read, and switching is performed based on this switching data. A control signal is obtained, and this switching control signal is supplied to the switch 14 shown in FIG. 1A to connect the movable contact f of the switch 14 to the fixed contact a.
As a result, a vertical synchronizing signal with a shift amount of 0 (fs) from the timing generation circuit 10 is output from the output terminal 15. Others are the same, and the value of the difference data is "1",
If "2", "3", and "4", the movable contact f of the switch 14 is connected to the fixed contacts b, c, d, and e, and the shift amount is 1/5 (fs), 2/5 ( fs), 3/5 (f
s), the vertical synchronization signal of 4/5 (fs) is output terminal 15
Are output respectively.

B. Explanation of the timing of the main part of the recording / reproducing apparatus shown in FIG. 1 (FIG. 2)

FIG. 2 is a timing chart for explaining the operation of the main part of the recording / reproducing apparatus shown in FIG.
In the following explanation of the operation, it is a registered device of NTSC system, 5 field sequence, power control function, insert recording or new video and audio from any position on the magnetic tape where video and audio data is already recorded. It is assumed that data will be recorded.

By the CTL head 5, the magnetic tape 12
The value of the ID data ID1 for the first sound in the CTL signal reproduced from the control track Tc of No. 1 is shown in FIG.
, "0", "1", "2", "3",
In the case where the "4" and the 5-field sequence are maintained, as shown in FIG. 2B, the number of samples of the audio data is such that the value of the first audio ID data ID1 is "0". Only "800", other "1" ~
In the case of the value up to “4”, it becomes “801”. To put it the other way round, the timing generation circuit 10 is used during normal recording.
The number of samples of audio data that is processed and recorded when the audio ID data generated in step 1 is "0" is "80".
The number of samples of the audio data processed and recorded in the cases of 0 ”and“ 1 ”to“ 4 ”is“ 801 ”, respectively.

The relationship between the fall of the vertical sync signal as a reference and the fall of the sampling clock signal of the audio data is as shown in FIGS. 2C and 2D. That is, when the value of the voice ID data is “0”,
The falling edge of the vertical synchronizing signal and the falling edge of the sampling clock signal of the audio data coincide with each other. When the value of the audio ID data is "1", the falling edge of the sampling clock signal of the audio data is delayed by 1/5 (fs) with respect to the falling edge of the vertical synchronizing signal. This is clear from the next calculation.

The time for one field in the NTSC system is 1 / {60 × (1000/1001)} 0.01
668333333. The time of one cycle of the 48 KHz sampling clock is 1/48000.
It becomes 0.00002083333. Therefore, 1/5
(Fs) is 0.0000208333 / 5 0.00
000416666. On the other hand, 800 of audio data
The sample length is 0.00002083333 x 8
00 becomes 0.0166666664. Here, when the time for 800 samples is subtracted from the time for one field, 0.01668383333333-0.0166666.
64 = 0.00001666933. That is, 8
The time for 00 samples is longer than the time for 1 field.
Only 0.00001666693 is short. Here, if the difference between the above difference and the time of one cycle of the audio data is obtained, it is 0.
00002083333-0.00001666933
= 0.000004164. That is, the difference is 0.0000 times longer than the time for one cycle of the audio data.
It turns out that it is only 016464. Therefore, it can be seen that the fall of the vertical synchronization signal is before the fall of the 801st sample of the audio data. Here, the time for 801 samples of the audio data is obtained, and the time,
Find the time difference for one field. (0.0000208333 × 801) -0.01668333333 = 0.0166884733-0.01668333333 = 0.000004164 This value is substantially equal to 1/5 (fs). That is, ID
When the data value is "1", the sampling clock signal of the audio data falls with a delay of 1/5 (fs) from the fall of the vertical synchronizing signal.

Since the number of samples of the audio data processed from the ID data value of "1" to "4" is 801 samples respectively, the audio data of the falling edge of the vertical synchronizing signal for each ID is output. The trailing edge of the sampling clock signal is delayed by 1/5 (Fs). Therefore, as is apparent from FIGS. 2C and 2D, when the value of the ID data is “2”, “3”, and “4”, 2/5 (fs), respectively, from the fall of the vertical synchronization signal. 3/5
The sampling clock signal of the audio data falls with a delay of (Fs) and 4/5 (Fs). Then, at the beginning of the next 5 field sequence, that is, when the value of the ID data is "0", the falling edge of the vertical synchronizing signal and the falling edge of the sampling clock of the audio data coincide with each other.

As can be seen from the above description, the relationship between the falling edge of the vertical synchronizing signal and the falling edge of the sampling clock signal of the audio data is always one-to-one with respect to the value of the ID data. Therefore, a vertical synchronization signal having a phase corresponding to the difference between the value of the first ID data ID1 reproduced from the magnetic tape and the value of the third ID data ID3, which is the self-running ID, is selected, and the vertical sync signal is selected. If the synchronization signal is supplied to the recording system, the process locked to the first ID data ID1, that is, the process maintaining the 5-field sequence can be performed.

Recording is classified into insert recording and normal recording. There are two possible patterns for insert recording. One pattern is the video and audio IDs recorded in the video and audio data recorded so as to form a slanted track during the insert period.
It is natural that data is added to each, and the second audio
ID data ID2 is a pattern recorded in the longitudinal direction.

The other pattern is a pattern in which the second ID data ID2 is not recorded in the longitudinal direction. Since insert recording is to record new video and audio data in an arbitrary section on the magnetic tape where video and audio data has already been recorded, ID data already recorded in the longitudinal direction of the magnetic tape. This is because it is not necessary to delete ID1 and newly record ID data ID2.

In normal recording, when input video and audio data is recorded from an arbitrary position of the magnetic tape on which video and audio data has already been recorded, the ID value of the originally recorded audio data is recorded. Then, the ID values of the newly recorded audio data are recorded so as to be continuous. In other words, the connection recording, the ID value of the originally recorded audio data, and the ID of the newly recorded audio data are recorded. There is a mere record regardless of the continuity of values. In the case of continuous recording, the ID data ID2 is recorded so as to be added to the audio data so as to form an inclined track together with the video data, and also recorded in the longitudinal direction. In the case of simple recording, the ID data ID3 is added to the audio data so as to form an inclined track together with the video data, and is also recorded in the longitudinal direction. Incidentally, the designation of these modes at the time of recording can be designated by, for example, a key input from the user or a control signal from the editing machine.

In the following description, during the insert period, the video and audio ID data are added to the video and audio data recorded so as to form the inclined track, and the second ID data ID2 for audio is added. Is premised on insert recording of a pattern that is not recorded in the longitudinal direction.

At the time of insert recording, when the input video signal is recorded on the magnetic tape, the value of the first ID data ID1 originally recorded at the position immediately before the insert portion and the values after the insert portion are recorded. The value of the second ID data ID2 added to the audio data over the range must be continuous, for example, 0, 1, 2, ... The processing described above satisfies this condition.

That is, the first I reproduced from the magnetic tape
The D data ID1 is delayed by a time in consideration of the communication delay, and is supplied to the recording system as the second ID data ID2. The recording system processes the audio data based on the value of the second ID data ID2. That is, the second ID
If the value of the data ID2 is "0", the audio data for 800 samples obtained by sampling is processed so as to be recorded. If the value is "1" to "4", the audio data for 801 samples obtained by sampling is processed. Process the data to be recorded. Further, the recording system ID adding circuit 115
The second ID data ID2 is added to the voice data. Here, “processing for recording” means processing so that the number of audio data finally recorded on the magnetic tape is 800 or 801 samples per one field.

At this time, the vertical synchronizing signal having the phase corresponding to the difference between the first ID data ID1 and the third ID data ID3 is also selected, and the selected vertical synchronizing signal is selected. , Supplied to the recording system. This is because the vertical synchronization signal is currently locked to the first ID data ID3, which is a free-running ID. That is, if the value of the third ID data ID3 is "0", the falling edge of the vertical synchronizing signal and the falling edge of the sampling clock signal of the audio data match, and the value of the third ID data ID3 is "1". "," 2 "," 3 ",
Corresponding to the change of "4", the fall of the sampling clock signal of the audio data is 1/5 (Fs), 2/5 (Fs), sequentially from the fall of the vertical synchronizing signal.
3/5 (Fs), 4/5 (Fs) and later.

However, the above third ID data ID
3 is used for processing voice data to be recorded, and is not added to the voice data by the ID adding circuit 115. First reproduced from magnetic tape
Second ID data ID delayed by ID data ID1 of
2 is used for processing audio data to be recorded from now on, and is further added to the audio data by the ID adding circuit 115. This is because the 5-field sequence on the magnetic tape must be maintained even after new recording or insert recording.

As described above, if the recording is not carried out in this way, the 5 on the magnetic tape after the insert recording is recorded.
The field sequence is broken. That is, "800, 8
The cycle of "01, 801, 801, 801" is no longer available. Therefore, at the time of reproduction, although only 801 samples of audio data are recorded per field, only 800 samples of audio data are reproduced and audio data of 1 field with 800 samples are reproduced. 801 despite being recorded only
The reproduction process is performed assuming that there is audio data for the sample, and as a result, noise is generated.

Therefore, the first ID data ID1 reproduced from the magnetic tape is delayed to generate the second ID data ID2, and the second ID data ID2 is used as a flag for processing the audio data. Further, it supplies the recording system with an ID to be added to the audio data, and also supplies a vertical synchronization signal according to the difference between the values of the first ID data ID1 and the third ID data ID3 to the recording system. This is because the value of the first ID data ID1 reproduced from the magnetic tape and the value of the third ID data ID3 as the free-running ID do not always match. The first ID data ID1 and the third I
Taking the difference from the D data ID3 is the third ID data I, which is the standard of operation at the present time.
The period from the falling edge of the vertical synchronizing signal to the falling edge of the sampling clock signal corresponding to the value of D3 and the falling edge of the sampling clock signal from the falling edge of the vertical synchronizing signal corresponding to the first ID data ID1. It is to find out how much difference there is from the time until the point of fall.

At the present time, it is necessary to select the vertical synchronizing signals corresponding to the respective difference data and use the selected vertical synchronizing signals as the reference signal for the processing in the recording system.
From the state where the relationship between the phase of the vertical synchronizing signal and the phase of the sampling clock signal is established corresponding to the value of the third ID data ID3 obtained by free running, the first I
This is to select the vertical synchronizing signal for establishing the relationship between the phase of the vertical synchronizing signal and the phase of the sampling clock signal corresponding to the value of the D data ID1.

For example, consider a case where the value of the third ID data ID3 is "1" and the value of the first ID data ID1 is "2". When the value of the third ID data ID3 is "1", the trailing edge of the sampling clock signal is delayed by 1/5 (Fs) with respect to the trailing edge of the vertical synchronizing signal. The recorded ID data is the first I
The D data ID1 is the delayed second ID data ID2 and its value is "2". At this point in time, the value of the third ID data ID3 is "1", so that the trailing edge of the sampling clock signal is delayed by 1/5 (Fs) with respect to the trailing edge of the vertical synchronizing signal.

When the value of the third ID data ID3 is "2", the falling edge of the sampling clock signal is 2 /
It is delayed by 5 (Fs). Therefore, the current state,
That is, from the state where the falling edge of the sampling clock signal is delayed by 1/5 (Fs) with respect to the falling edge of the vertical synchronizing signal, the rising edge of the vertical synchronizing signal indicated by the value "2" of the second ID data ID2 is shown. In order to make the falling edge of the sampling clock signal delayed by 2/5 (Fs) with respect to the falling edge, the falling edge of the vertical synchronization signal is set to 1
It may be delayed by / 5 (Fs). That is, the first ID
When the value of the data ID1 is "2" and the value of the third ID data ID3 is "1", the value of the difference data is "1". Therefore, the vertical sync signal selected at this time is
As shown in FIGS. 1B and C, respectively, the vertical synchronization signal VDb is delayed by ⅕ (Fs) from the vertical synchronization signal VDa at the present time. Hereinafter, some other examples will be described.

A third ID supplied from the timing generating circuit 10 to the ID generating circuit 6 during insert recording.
The value of the data ID3 becomes "0" as shown in FIG. 2E, and the value of the first ID data ID1 supplied from the servo circuit 1 to the ID generating circuit 6 becomes "0" as shown in FIG. 2F. When it is "0", the subtraction result in the subtraction circuit 7 is "0", so that the vertical synchronization signal selected by the switch 14 at this time falls as shown in FIGS. 2C and 2D. Will coincide with the fall of the audio sampling clock signal. That is, MP
By U8, the vertical synchronizing signal having the shift amount of 0 (fs) is selected.

Further, at the time of insert recording, the third signal supplied from the timing generation circuit 10 to the ID generation circuit 6
The value of the ID data ID3 of is, as shown in FIG. 2E,
When the value of the first ID data ID1 supplied from the servo circuit 1 to the ID generation circuit 6 becomes "4" as shown in FIG. 2G, the subtraction circuit 7
Since the subtraction result in is "4", at this time,
The vertical synchronizing signal selected by the switch 14 has a trailing edge position of 4/5 (fs) as shown in FIG. 2D rather than the trailing edge of the reference vertical synchronizing signal indicated by the arrow in FIG. 2C. Only then will it fall.
That is, the MPU 8 selects the vertical synchronization signal with the shift amount of 4/5 (fs).

Further, at the time of insert recording, the third signal supplied from the timing generating circuit 10 to the ID generating circuit 6 is supplied.
The value of the ID data ID3 of is, as shown in FIG. 2E,
2H, the value of the first ID data ID1 supplied from the servo circuit 1 to the ID generating circuit 6 becomes "0".
As shown in I and J, when the values are “3”, “2”, and “1”, respectively, the subtraction results in the subtraction circuit 7 are “3”, “2”, and “1”, respectively. At this time, the vertical synchronizing signal selected by the switch 14 has a trailing edge position as shown in FIG. 2D rather than a trailing edge of the reference vertical synchronizing signal indicated by an arrow in FIG. 2C.
3/5 (fs), 2/5 (fs), 1/5 (fs) respectively
Only then will it fall. That is, the MPU 8 changes the shift amounts to 3/5 (fs) and 2/5 (f), respectively.
s) and 1/5 (fs) vertical synchronizing signals are selected, respectively.

[Effects Derived from the Embodiment] As described above, in the present embodiment, the fixed head 5 records the third ID data ID3 for audio in the longitudinal direction of the magnetic tape 121 by the fixed head 5. Incidentally, at the time of insert recording or connection recording, the difference between the first ID data ID1 reproduced from the magnetic tape 121 and the third ID data as the free-running ID is obtained, and the shift amount corresponding to this difference is obtained. The vertical synchronizing signal is supplied to the recording system, and the first ID data ID1 is delayed by the transmission time to generate the second ID data ID2. The data was supplied to a recording system and used as a reference for processing in the recording system and added to the audio data. Therefore, the 5-field sequence can be held on the magnetic tape 121 after the insert recording or the splice recording, so that at the time of reproduction, the 800-sample audio data is recorded in the 800 The audio data of the sample is surely reproduced, and the audio data of the 801 sample is surely reproduced in the portion where the audio data of the 801 sample is recorded. Therefore, the audio data of 801 samples is reproduced in the portion in which the audio data of 800 samples is recorded, or only the audio data of 800 samples is reproduced in the portion in which the audio data of 801 samples is recorded. , The continuously existing audio data is missing by one sample, or 1
A video tape that has a power control function to prevent the generation of noise that is caused by being separated from the sample
Also in the recorder, there is a remarkable effect that it can be surely prevented.

[0087]

According to the present invention described above, the reproduction identification information from the recording / reproduction system is supplied to the recording system after being delayed by the processing time, and the difference between the reproduction identification information and the free-running identification information is eliminated. By giving a corresponding synchronization signal to the recording system, as a result, the operation of the recording system is locked with respect to the identification information on the recording medium, and the continuity of the identification information recorded on the recording medium is maintained. However, since the input video and audio information is recorded, the relationship between the audio information and the audio information can be kept constant without using a playback system, and the video and audio information has already been recorded. Even when newly recording video and audio information on a recording medium, recording can be performed while maintaining the above relationship, and the above relationship on the recording medium can be maintained, and particularly good audio information reproduction. There is an effect that can be current.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a recording / reproducing apparatus of the present invention.

FIG. 2 is a timing chart for explaining an operation of a main part of the recording / reproducing apparatus shown in FIG.

FIG. 3 is a timing chart for explaining the operation of the recording / reproducing apparatus shown in FIG.

FIG. 4 is an explanatory diagram showing a tape format of the digital VTR shown in FIG.

FIG. 5 is an explanatory diagram for describing inconvenience during insert recording.

[Explanation of reference numerals] 1 servo circuit 2, 4 amplification circuit 3 capstan motor 5 fixed head 6 ID generation circuit 7 subtraction circuit 8 MPU 9 table 10 timing generation circuit 11 crystal oscillator 14 switch

Claims (1)

[Claims] 1. A recording system for recording video and audio information so as to form a slanted track on a recording medium, and a longitudinal track is formed on the recording medium corresponding to the video and audio information, respectively. , An identification information recording / reproducing unit for recording self-running identification information having continuous and circulating values, reproducing the identification information recorded on the recording medium to obtain reproduction identification information, an input video and When recording the audio information, the reproduction identification information is supplied to the recording system, and the difference between the identification information generating means for generating the free-running identification information, the reproduction identification information, and the free-running identification information. A table including a plurality of difference values and information indicating sync signals corresponding to the plurality of difference values and used in the recording system having different phases, and the sync signals having different phases. husband The timing generating means to be generated and the synchronizing signal corresponding to the difference value from the subtracting means are recognized by referring to the table, and the timing generating means generates the timing generating means based on the recognition. A recording / reproducing apparatus having a control means for providing a control signal indicating one of the synchronizing signals having different phases.