JP2002025233A - Device and method for editing information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an edition function that mixes a signal that is previously recorded on a magnetic tape with another signal and records the signals on the original place without providing a precedent reproducing head. SOLUTION: A reproducing operation fast and also intermittently reproduces data from the magnetic tape, stores the data in a memory 101 for reproduction and continuously reads the data from the memory 101 for reproduction at a normal speed. A recording operation continuously stores recording data in a memory 100 for recording, fast and also intermittently reads the stored data and records the data on the magnetic tape. An intermittent reproducing operation and an intermittent recording operation are alternately repeated, and the magnetic tape is also subjected to fast rewinding running between the reproducing operation and the recording operation. Thus, the signals obtained by mixing the signal reproduced from the magnetic tape with the other signal with a mixing circuit 16 can be recorded again on the original place on the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information editing apparatus for recording digital data on a magnetic tape and reproducing the data from the magnetic tape, and more particularly to recording and editing of a digitized video signal or audio signal.

[0002]

2. Description of the Related Art A digital video tape recorder for a broadcasting station (hereinafter referred to as a broadcast D-VTR) uses a magnetic tape on which a video signal and an audio signal are recorded, and separates the audio signal from an already recorded audio signal. And a pre-read editing function of recording the audio again while watching the reproduced video while mixing the audio signal with the original audio signal.

[0003] A conventional broadcasting D-VTR having such an editing function will be described below with reference to the drawings. FIG. 16 is a schematic diagram showing a head arrangement on a rotating cylinder of a conventional broadcast D-VTR. FIG. 16 is a view of the rotary cylinder 1 as viewed from above. In FIG. 16, the rotary cylinder 1 rotates counterclockwise. The rotary cylinder 1 is equipped with recording heads 3 and 4 and heads 5 and 6 for preceding reproduction or simultaneous reproduction mounted on the electro-mechanical conversion elements 7 and 8. The magnetic tape 2 runs obliquely around the rotary cylinder 1 over a section of approximately half a circumference (180 degrees).

FIG. 17 is a diagram showing a positional relationship between a recording track pattern on a magnetic tape 2 and a head. In FIG. 17, a video signal and an audio signal are already recorded on the magnetic tape 2, and the tracks 9a, 9b, 9c, 9
d, 9e, 9f, 9g, 9h, 9i, etc. are formed. Here, the magnetic tape 2 is always reproduced at a constant speed from right to left in the drawing. For this reason, 9a, 9b, 9c,
Are recorded in the order of... When performing the advance reproduction, the electro-mechanical transducer 7 is driven to the advance reproduction position, and the advance reproduction head 5 is ahead of the recording head 3 by four tracks (a signal earlier in time is recorded). )
Play a track. That is, the recording head 3 is moved to the track 9b.
When it is above, the preceding reproduction head 5 is on the track 9f which is four tracks ahead. Also, although not shown, when the recording head 4 is positioned on the tape, the electro-mechanical transducer 8 is driven to the preceding reproducing position, and the preceding reproducing head 6 moves the track which is four tracks ahead of the recording head 4. To play.

Next, the configuration of the conventional broadcasting D-VTR and the operation in the case where an already recorded audio signal is mixed with another audio signal and recorded again at the original location will be described. FIG. 18 shows a configuration for editing an audio signal already recorded by a conventional broadcast D-VTR. FIG.
, The electro-mechanical conversion elements 7 and 8 are connected to the preceding reproduction heads 5 and 6 mounted by the element driving circuit 14.
Is driven to a position four tracks ahead of the recording heads 3 to 4, and the magnetic tape 2 is driven by the tape drive circuit 15 and the capstan motor 17. Advance playback head 5
The signals reproduced in (6) to (6) are supplied to a reproduction processing circuit 13 via a head switch 12. Head switch 12
Is controlled by a control signal (not shown) synchronized with the rotation of the rotary cylinder 1, and selects the preceding reproduction head located on the magnetic tape. The reproduction processing circuit 13 includes the head switch 12
The demodulation, error correction and deshuffling processes are performed on the reproduction signal 22 selected in step (1), and the signal 18 is returned to the original digitized video signal and audio signal form.

[0006] The signal 18 is input to the mixing circuit 16. Further, another audio signal 19 to be mixed with the recorded audio signal is also input to the mixing circuit 16. The mixing circuit 16 mixes the reproduced audio signal and the audio signal 19 to obtain a new audio signal, and outputs a signal 20 as a new digital recording signal obtained by combining the reproduced audio signal with the reproduced video signal.

[0007] The signal 20 thus obtained is input to the recording processing circuit 11. The recording processing circuit 11 performs shuffling processing, error correction coding, modulation, and the like on the signal 20 and outputs a signal 21. The signal 21 is supplied to the recording heads 3 and 4 via the head switch 10 and overwritten on all or a part of the track on the magnetic tape. The head switch 10 is controlled by a control signal (not shown) synchronized with the rotation of the rotary cylinder 1, and selects a recording head located on the tape.

FIG. 19 is a time chart showing a time relationship between the signal 22 and the signal 21. FIG. 19A shows a signal 22, and G, H, I, etc. are signals reproduced from the tracks 7g, 7h, 7i in FIG. 19, respectively. Here, the signal 22 passes through the reproduction processing circuit 13, the mixing circuit 16, and the recording processing circuit 11 before reaching the signal 21.
Due to the processing time required in the process, the time required for the magnetic tape 2 to travel about four tracks is delayed. For example, a signal 22 reproduced from the track 7g by the preceding reproduction head 5
Is mixed with the audio signal 19 in the mixing circuit 16 through the reproduction processing circuit 13 and further mixed with the recording processing circuit 11.
To G1 of the signal 21. The state of the signal 21 at this time is shown in FIG. Thus, the signal 21 is delayed from the signal 22 by about four tracks.

As described above, the preceding reproducing heads 5 and 6 reproduce the track ahead of the recording heads 3 and 4 by four tracks, respectively (in which a signal earlier in time is recorded). It is configured as follows. Thereby, the signal 21
When G1 is supplied to the recording head, the recording head is located on the track 7g where G of the original signal 22 was recorded, and can be recorded at the original position on the magnetic tape. Also, in broadcast D-VTRs, it is required to check the recorded contents. In order to realize the function, the electromechanical transducers 7 to 8 are driven to the position of the subsequent reproducing head to reproduce the position following the recording heads 3 to 4, and the subsequent reproducing heads 5 to 6 are reproduced. Reproduces the track with respect to the recording heads 3 and 4 with a delay of the head allocation. That is, when the recording head 3 is on the track 7b, the following reproducing head 5 is also
b. Although not shown, when the recording head 4 is positioned on the tape, the trailing reproducing head 6 reproduces a track with a delay of the head allocation with respect to the recording head 4. By outputting the signal reproduced from the succeeding reproducing head through the reproduction processing circuit 13, the recorded signal can be checked almost simultaneously.

As described above, in the conventional broadcasting D-VTR, the electro-mechanical conversion element is set at the preceding reproduction position or the subsequent reproduction position so that the track temporally preceding or succeeding the recording head can be reproduced. By driving, it absorbs the delay time required from playback to recording, mixes the already recorded audio signal with another audio signal and records it again at the original location and confirms the recorded content immediately after recording Simultaneous playback function is realized. In addition, the track pitch becomes narrower due to long-time recording, and a non-tracking reproducing method using a plurality of heads has been proposed in order to guarantee compatible reproduction in a narrow track format.

A conventional broadcast D-VTR having such a reproducing function will be described below with reference to the drawings. FIG. 20 is a schematic diagram showing a head arrangement on a rotating cylinder of a conventional broadcast D-VTR. FIG. 20 is a view of the rotary cylinder 1 as viewed from above. In FIG. 20, the rotary cylinder 1 rotates counterclockwise. In the rotary cylinder 1, the recording heads 3 and 4, the reproducing heads 5 and 6 arranged at the simultaneous reproducing position, and the reproducing heads 5 and 6 are interpolated to a position where all data on the recording track can be reproduced even in a narrow track. Non-tracking reproducing head 3 arranged
5, 36 are mounted. The rotary cylinder 1 has
The magnetic tape 2 runs while being wound diagonally over a section of about a half circumference (180 degrees).

FIG. 21 is a diagram showing the positional relationship between the recording track pattern on the magnetic tape 2 and the head. In FIG. 21, a video signal and an audio signal are already recorded on the magnetic tape 2, and the tracks 9a, 9b, 9c, 9
d and the like are formed. Here, the magnetic tape 2 is always reproduced at a constant speed from right to left in the drawing. Therefore, signals are recorded in the order of 9a, 9b, 9c,.... In the case of performing normal reproduction, the reproduction head 5 and the non-tracking reproduction head 35 arranged at positions that can be interpolated with each other reproduce a track. During simultaneous playback,
The reproducing head 5 reproduces a position delayed from the recording head 3 by an amount assigned to the head. That is, the recording head 3 is moved to the track 9
When the reproduction head 5 is on the track 9b, the reproduction head 5 is on the track 9b delayed by the head allocation from the recording head 3, and the non-tracking reproduction head 35 is on the track 9c one track ahead. Although not shown, when the recording head 4 is similarly positioned on the tape, the reproducing head 6
, And the non-tracking reproducing head 36 reproduces the position where the reproducing head 6 is interpolated.

Next, the configuration of the conventional broadcast D-VTR, the operation for non-tracking reproduction using a 2-channel reproduction head, and the operation for simultaneous reproduction during recording will be described. FIG. 22 shows a configuration of a conventional broadcast D-VTR in which non-tracking reproduction and simultaneous reproduction during recording are performed.

First, the case of non-tracking reproduction will be described. In FIG. 22, the magnetic tape 2 is driven by a tape drive circuit 15 and a capstan motor 17. The signals reproduced by the reproduction heads 5 and 6 are supplied to the reproduction processing circuit 33 via the head switch 12. The signals reproduced by the non-tracking reproduction heads 35 to 36 are supplied to a reproduction processing circuit 33 via a head switch 32. The head switches 12 to 32 are controlled by a control signal (not shown) synchronized with the rotation of the rotary cylinder 1, and a reproducing head or a non-tracking reproducing head located on the magnetic tape 2 is selected. Head switch 1
The reproduction signals 37 to 38 selected in 2 to 32 are demodulated by the reproduction processing circuit 33, subjected to interpolation processing, error correction processing, and deshuffling processing of data reproduced from the two channels, and converted to the original digitized video signal and The signal 39 returned to the form of the audio signal is output. The signal 39 thus obtained is converted into an analog signal and output.

Next, simultaneous reproduction during recording will be described. The digitized recording signal 40 is transmitted to the recording processing circuit 11
Is input to The recording processing circuit 11 performs shuffling processing, error correction coding, modulation, and the like on the signal 40, and outputs a signal 41. The signal 41 is supplied to the recording heads 3 and 4 via the head switch 10 and recorded on the magnetic tape. The head switch 10 is controlled by a control signal (not shown) synchronized with the rotation of the rotary cylinder 1, and a recording head located on the tape is selected. The recorded signal is reproduced by the reproducing heads 5 and 6 arranged at positions delayed by the head allocation. The signals reproduced by the reproduction heads 5 and 6 are supplied to the reproduction processing circuit 33 via the head switch 12. The head switch 12 is a control signal (not shown) synchronized with the rotation of the rotary cylinder 1.
And the reproduction head located on the magnetic tape is selected. Reproduction signal 37 selected by head switch 12
Performs demodulation, error correction processing and deshuffling processing in the reproduction processing circuit 33, and outputs a signal 39 returned to the original digitized video signal and audio signal form. The signal 39 thus obtained is converted into an analog signal and output.

As described above, in the conventional broadcasting D-VTR, the electro-mechanical conversion element is moved to the preceding reproduction position or the subsequent reproduction position so that the track temporally preceding or following the recording head can be reproduced. By driving, the delay time required from reproduction to recording is absorbed, for example, a pre-read editing function that mixes an already recorded audio signal with another audio signal and records it again at the original location, or recording immediately after recording A simultaneous playback function for confirming the contents is realized. However, at the time of pre-read editing, the simultaneous playback function could not be realized because the playback head was at the preceding playback position.

In the non-tracking reproduction method in the narrow track format, in normal reproduction, the reproduction head has two channels, and the heads are interpolated with each other, so that compatible reproduction is possible. Further, the simultaneous reproduction function at the time of recording is also realized by only a one-channel reproduction head.
However, the simultaneous playback function in insert editing requires reading the underlying track other than the rewritten portion, and also requires the use of a non-tracking playback head. But,
Crosstalk from the recording head to the non-tracking reproducing head was large, and it was difficult to obtain sufficient reproducing quality.

[0018]

As described above, in the conventional broadcasting D-VTR, an editing function for mixing an already-recorded audio signal with another audio signal and recording the mixed audio signal again at the original location or a recorded audio signal. In order to realize a simultaneous playback function for confirming the contents, it was necessary to provide a preceding playback head and a simultaneous playback head. However, when the size of the rotary cylinder is reduced to reduce the size and weight of the device, there is a problem that it is difficult to provide a leading head. If the time required for processing the reproduced data and recording it again is long, it is necessary to make the track reproduced by the preceding reproducing head significantly precede the recording head. There is also a problem that it may not be mechanically possible to provide a preceding reproduction head. If the track pitch becomes narrow due to long-time recording, it is possible to increase the number of rotations of the cylinder or to perform non-tracking reproduction using a plurality of heads. The former has the point that the recording / reproducing frequency increases, and the latter cannot be mounted separately on the cylinder, increasing the crosstalk from the recording head to the non-tracking reproducing head during simultaneous reproduction. Was difficult to achieve.

In the case of a cylinder using an electro-mechanical conversion element at the time of pre-read editing, there is a drawback that simultaneous reproduction output cannot be obtained because the reproduction head is located at the preceding reproduction position.
Further, in the case of a cylinder having a non-tracking configuration, there is another problem that when insert recording is performed in which a part of a track is partially rewritten, reproduction output of a base track other than the rewritten part cannot be read by crosstalk.

Therefore, an object of the present invention is to provide a pre-read editing function of processing an already-recorded signal and recording it again at an original place without providing a preceding reproduction head, or recording audio in synchronization with a video. To provide an information editing device.

[0021]

SUMMARY OF THE INVENTION An information editing apparatus according to the present invention performs a process of reproducing reproduced data from a magnetic tape at a high speed, rewinding the magnetic tape only in the reproduced section, and recording edited data at a high speed in the reproduced section. It has a configuration to repeat sequentially.

According to the present invention, a preread editing function of processing an already recorded signal and recording it again at an original place or recording audio along with a video without providing a preceding reproducing head is provided by the present invention. An information editing apparatus provided with the information processing apparatus can be provided.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention is a tape driving means for driving a magnetic tape, and a reproducing means for intermittently reproducing reproduction data at a high speed from the magnetic tape driven by the tape driving means. A second memory for writing and continuously reading the reproduced data reproduced by the reproducing means, a first memory for continuously writing and reading edited data, and rewinding the magnetic tape by the tape driving means. Recording means for intermittently high-speed recording the edited data read from the first memory onto a magnetic tape driven by the tape driving means, and control means for controlling the operation of each means. , The control means comprises:
An information editing apparatus characterized by controlling all or a part of each means so as to sequentially repeat the high-speed reproduction, the rewind, and the high-speed recording operation. It is possible to perform pre-read editing, such as processing an already-recorded signal and recording it again at the original location, or recording audio along with a video without providing a preceding playback head. According to a second aspect of the present invention, in the first aspect, a compression unit for compressing the edit data and a decompression unit for expanding the edit data are provided, and the first memory receives the edit data compressed by the compression unit as an input. , The output of the second memory is input to the expansion means,
An information editing device characterized by being decompressed,
The edited data compressed by the compression means is input to the first memory, and the output of the second memory is expanded by the expansion means, so that the amount of memory can be significantly reduced.

According to a third aspect of the present invention, in the first aspect, the read speed of the first memory is set to N1 times speed (N1> 1) in normal recording, and the write speed of the second memory is set to normal speed in normal reproduction. When N2 speed (N2> 1), 1 / N1 + 1
/ N2 <1. With this configuration, the information editing apparatus of the present invention can continuously perform preread editing work.

A fourth invention of the present invention is the information editing apparatus according to the third invention, wherein N2> N1. With this configuration, the information editing apparatus of the present invention reduces the amount of memory. It becomes possible to do.

According to a fifth aspect of the present invention, in the first aspect, the first memory and the second memory comprise a single storage device for writing and reading edited data and writing and reading reproduced data. With this configuration, the information editing apparatus of the present invention can
And the memory of the second memory can be shared.

According to a sixth aspect of the present invention, in the first aspect, the comparing means for comparing the edited data read from the first memory with the reproduced data reproduced by the reproducing means during recording and outputting a comparison result is provided. The information editing apparatus according to the present invention can detect clogging during pre-read editing.

According to a seventh aspect of the present invention, there is provided the information editing apparatus according to the first aspect, further comprising a third memory for writing an output of the reproducing means during reproduction and recording and reading the output as a simultaneous reproduction output. With this configuration, the information editing apparatus of the present invention can obtain a simultaneous reproduction output during pre-read editing.

According to an eighth aspect of the present invention, there is provided a tape driving means for driving a magnetic tape, a memory for continuously writing and reading edit data, and a method for rewinding the magnetic tape by the tape driving means. Recording means for intermittently recording the edited data read from the memory on the magnetic tape driven by the driving means at high speed; and reproducing reproduction data at high speed intermittently from the magnetic tape driven by the tape driving means. And a control unit for controlling the operation of each unit, wherein the control unit controls all or a part of each unit so as to sequentially repeat the high-speed reproduction, the rewinding, and the high-speed recording operation. With this configuration, the information editing apparatus of the present invention can perform pre-read editing with a simple circuit configuration.

A tape driving means for driving the magnetic tape; and a recording for intermittently recording edit data at high speed on the magnetic tape driven by the tape driving means after rewinding the magnetic tape by the tape driving means. Means,
Reproducing means for intermittently reproducing reproduced data from the magnetic tape driven by the tape driving means at a high speed; a memory for writing and continuously reading the reproduced data reproduced from the reproducing means; Controlling means for controlling all or part of each means so as to sequentially repeat the high-speed reproduction, the rewinding, and the high-speed recording operation. Also, with this configuration, the information editing apparatus of the present invention can perform pre-read editing with a simple circuit configuration.

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment has a function of mixing a signal already recorded on a magnetic tape with another signal and recording the original signal again at the original location, similarly to the conventional example, and a pre-read editing function without providing a preceding reproduction head. Will be described.

FIG. 1 shows a broadcast D-VTR according to the present embodiment.
FIG. 3 is a block diagram showing a configuration of an information editing device for editing an audio signal already recorded in FIG. In FIG. 1, blocks and signals having the same functions as those in the conventional example are given the same numbers.

In FIG. 1, 2 is a magnetic tape, 3 and 4 are recording heads for recording signals on the magnetic tape 2 at a second data rate, and 5 and 6 are data recorded on the magnetic tape 2 in the second data rate. Playback heads for playback at the data rate, 10,
A head switch 12 is controlled by a control signal (not shown) synchronized with the rotation of the rotary cylinder, and selects one of the recording heads 3 and 4 and the reproducing heads 5 and 6 which are in contact with the magnetic tape 2, respectively. Input data signal 10
9 performs a shuffling process, error correction encoding, modulation, etc., and outputs an output data signal 21 at a second data rate to the head switch 10. A recording processing circuit 13 demodulates, corrects, and deshuffles the input signal 22. A reproduction processing circuit that performs processing and outputs the data signal 108;
5 is a tape drive circuit for driving the capstan motor 17, 16 is a mixing circuit for mixing the input reproduction signal 18 and signal 110 and outputting it as a recording signal 20, 17 is a capstan motor for driving the magnetic tape 2, 100 Stores the recording signal 20 output from the mixing circuit 16 continuously at a first data rate, and intermittently reads out the stored data at a second data rate faster than the first data rate in the recording order. A recording memory, which is a first memory that outputs the data signal 109 to the recording processing circuit 11,
1 is data 1 intermittently reproduced by the reproduction processing circuit 13
08 is sequentially stored at the second data rate, and is read out continuously at the first data rate in the stored order and is output to the mixing circuit 16 as the reproduction signal 18. Remaining data amount of recording memory 100 and reproduction memory 101 and reproduction processing circuit 13
The recording memory 100, the reproducing memory 101, the recording processing circuit 11,
It is a control circuit for controlling the operations of the reproduction processing circuit 13 and the tape drive circuit 15.

Here, the mixing circuit 16 has processing means for processing the read signal. The recording processing circuit 11, the head switch 10, and the heads 3 and 4
A recording means for intermittently recording data read from the recording memory 100 as the memory on the magnetic tape 2 is constituted. Also, the reproduction processing circuit 13, the head switch 12,
The heads 5 and 6 constitute reproducing means for intermittently reproducing data from the magnetic tape 2 at the second data rate.

FIG. 2 is a diagram showing the arrangement of the heads on the rotary cylinder, and FIG. 3 is a diagram showing the positional relationship between the recording track patterns on the magnetic tape 2 and the heads. In FIG. 2, the rotary cylinder 1 rotates counterclockwise. The rotary cylinder 1 has recording heads 3 and 4 and reproducing heads 5 and 6 mounted thereon.
In addition, this rotary cylinder 1 has approximately half a circumference (180 degrees).
The magnetic tape 2 runs while being wound diagonally over the section of. A video signal and an audio signal are already recorded on the magnetic tape 2, and as shown in FIG.
a, 9b, 9c, etc. are formed. Here, the magnetic tape 2 is always reproduced at a constant speed from right to left in the drawing. Therefore, signals are recorded in the order of 9a, 9b, 9c,.... The reproducing head 5 reproduces a position delayed by a head allocation angle with respect to the recording head 3 (where a later signal is recorded). That is, when the recording head 3 is on the track 9a, the reproducing head 5 is on the track 9a delayed by the head allocation angle. Although not shown,
Similarly, when the recording head 4 is positioned on the tape, the reproducing head 6 reproduces a position delayed from the recording head 4 by the assigned angle. In this embodiment, the recording heads 3, 4 and the reproducing heads 5, 6 are arranged at symmetric positions of the rotary cylinder 1, and these are alternately switched by the head switches 10, 12.

Hereinafter, the operation of the information editing apparatus according to the present embodiment will be described.

First, the recording operation will be described. The signal 20, which is a digitized video and audio signal, is stored in the recording memory 10 at a first data rate (for example, 15 Mbps).
The data is recorded intermittently and read out intermittently in the order of storage at a second data rate (for example, 60 Mbps) higher than the first data rate and output as a signal 109. As in the conventional example, the signal 109 is subjected to shuffling processing, error correction coding, modulation, and the like in the recording processing circuit 11, and the signal 2
Output as 1. The signal 21 indicates that the head switch 10
After that, the data is intermittently recorded on the magnetic tape at a data rate of 60 Mbps by the recording heads 3 and 4. That is, 15M
The signal 20 which is a continuous signal of bps is stored in the memory 100 for recording.
The signal is converted into a signal 21 having a data rate of 60 Mbps, which is four times (N1 = 4> 1) higher than 15 Mbps, and is recorded on the magnetic tape 2 intermittently.

Next, the reproducing operation will be described. At the time of reproduction, the reproducing head 5 or 6 at a data rate of 60 Mbps
, An intermittent signal 22 is obtained via the head switch 12. The signal 22 is subjected to demodulation, error correction and deshuffling by the reproduction processing circuit 13 in the same manner as in the conventional example, and is sequentially stored in the reproduction memory 101 at a data rate of 60 Mbps. The signal 18 is read out to obtain the signal 18. That is, four times (N2
= 4> 1) Intermittently reproduce from a magnetic tape at a high data rate of 60 Mbps, and
A signal 18 which is a continuous signal of 5 Mbps is obtained. Also, N
Since 1 = N2 = 4, 1 / N1 + 1 / N2 <1
Becomes

When the signal already recorded on the magnetic tape and another signal are mixed and recorded again at the original location, the above-described intermittent recording operation and intermittent reproducing operation are alternately performed. At the same time, the magnetic tape runs at a high speed between the recording operation and the reproducing operation. At this time, the control circuit 102
Controls the operation of each unit. That is, the recording memory 100 and the recording processing circuit 11 transmit the control signal 10 from the control circuit 102.
By 3 and 104, an intermittent read operation and an intermittent recording processing operation are performed, respectively. The reproduction processing circuit 13 and the reproduction memory 101 are provided with a control signal 105 from the control circuit 102.
And 106, an intermittent demodulation operation and an intermittent write operation are respectively performed. Further, the tape drive circuit 15 for controlling the running of the magnetic tape 2 is controlled by a control signal 107 from the control circuit 102. The control circuit 10
2, a signal 108 reproduced from the magnetic tape 2 and control lines from the reproducing memory 101 and the recording memory 100 are input, whereby the running position of the tape and the remaining amount of each memory are grasped and each control is performed. Reflect on the signal.

Hereinafter, a more specific operation of each block under the control of the control circuit 102 will be described with reference to FIGS. FIG. 4 is a diagram showing a recording state on the magnetic tape 2. In FIG. 4, reference numerals 110 to 116 denote data blocks formed by collectively 2,000 tracks formed on the magnetic tape 2, each of which is block A, block B, block C, block D, block E, block F, and block F. Called block G. In one block, 15 Mbps video and audio data are recorded for about 30 seconds. In addition, BG described in the lower part of FIG.
Is an index indicating the playback start position of each of the blocks B to G in the tape longitudinal direction.

Now, in FIG. 4, it is assumed that the video and audio signals already recorded from block C to block E are mixed with another audio signal and recorded again at the original location. The operation in this case will be specifically described.

FIG. 5 is a timing chart for explaining the operation at this time. In FIG. 5, (a) shows the position in the longitudinal direction of the tape at each time by using an index indicating the reproduction start position shown at the bottom of FIG. FIG. 5B shows the running state of the magnetic tape 2, wherein "4x speed reproduction" is a state in which edited data is reproduced from the magnetic tape 2 at 4x speed, and "REW" is an average speed of about 6.5 times. Is a high-speed rewinding state in which the tape is rewound, and "quadruple speed recording" is a state in which edit data is recorded on the magnetic tape 2 at quadruple speed. FIGS. 5C and 5D respectively show the reproduction memory 101,
5 is a graph showing the amount of residual data stored in the recording memory 100 and not yet read. 5E and 5F respectively show the contents of the signal 108 to be written to the reproduction memory 101 and the signal 18 to be read out, and c, d, and e shown in FIG. , Block D, and block E. 5 (g) and 5 (h) show the contents of the signal 20 to be written to the recording memory 100 and the signal 109 to be read out, respectively, and c1, d1 and e1 are the blocks C, D and D in FIG. The signal c reproduced from block E,
A signal obtained by mixing d and e with another signal, and represents a signal to be recorded again at the positions of block C, block D and block E. FIG. 5 (i) shows the time when the time when the operation starts is set to 0.

First, it is assumed that the tape position is at the tape position C at time 0 as shown in FIG. The control circuit 102 instructs the tape drive circuit 15 to perform “4 × speed reproduction”.
And a control signal 106 for instructing the reproduction processing circuit 13 to perform the reproduction process. From the tape position C to the tape position D, the tape runs in the “4 × speed reproduction” state as shown in FIG. Blocks C and D are recorded from the tape position C to the tape position D. Blocks C and D record video and audio data of 15 Mbps as described above.
Is time T2 as shown in FIG. 5 (i). During this time, the device is in the playback state. At this time, as shown in FIG. 5E, the signal 108 demodulated by the reproduction processing circuit 13 becomes data c and d of the block C and the block D reproduced at 60 Mbps. Reproduction memory 10
1 sequentially stores the signals 108 during this time. As a result, as shown in FIG. 5C, the amount of residual data stored in the reproduction memory 101 and not read out increases. During this time, the reading of the data stored at 15 Mbps from the reproduction memory 101 is performed in the stored order.
As shown in FIG. 5F, the signal 18 outputs the data contents c and d of the blocks C and D at 15 Mbps.

The control circuit 102 detects from the data (for example, time code) at the output 108 of the reproduction processing circuit 13 that the reproduction of the block D from the block C has started, or the residual data in the reproduction memory 101 is reduced to a certain amount. When the control signal 10 is detected, the control signal 10 is sent to the tape drive circuit 15, the reproduction processing circuit 13, and the reproduction memory 101, respectively.
7, 106 and 105 are sent to stop the tape, and the reproduction processing and the memory writing operation are interrupted.

The signal 18 is mixed with another audio signal 110 by the mixing circuit 16 to form a signal 20. In this example, FIG.
As shown in (i), it is assumed that the processing during this time requires time T1. Therefore, the signal c of the block C obtained by mixing the reproduced data c of the block C with the audio signal 110
1 is the mixing circuit 1 from time T1 as shown in FIG.
6 is output. The signal 20 is always stored in the recording memory 100 sequentially at 15 Mbps. For this reason, the amount of residual data stored in the recording memory 100 and not read out becomes “4 × speed recording” from time T1 as shown in FIG. 5D.
Gradually increase until time T3 at which the start of.

Next, at time T2, the control circuit 102
Is the tape position D from the output signal 108 of the reproduction processing circuit 13.
Is reached, a control signal 107 for instructing a rewind command to the tape drive circuit 15 is sent, and the tape running is set to the “REW” state. Here, in FIG. 5B, the time T2 does not coincide with the start time of the “REW” state. This is because the control circuit 102 detects that the tape position D has been reached, and issues a rewind command. This is because quadruple-speed playback is performed until an instruction is issued and rewinding starts. When the control circuit 102 detects that the output signal 108 of the reproduction processing circuit 13 has returned to the tape position C, the control signal 107 causes the tape drive circuit 15 to stop rewinding. By this control, between time T2 and time T3, neither recording nor reproduction on the magnetic tape is performed, but data reading at 15 Mbps from the reproduction memory 101 is continuously performed, and the reproduction data of the signal 18 is There is no interruption. Also, a signal 20 at 15 Mbps to the recording memory 100 is output.
Is also performed without interruption. Reproduction memory 10
From 1, data is continuously read at 15 Mbps, and the signal 18 is applied to the block C as shown in FIG.
The data c continuously appears, and the residual data amount in the reproduction memory 101 decreases as shown in FIG. 3C, and the residual data amount becomes 0 at time T4. In the signal 20, data c1 obtained by mixing the signal 110 in the mixing circuit 16 appears continuously as shown in FIG. 5 (g), and is continuously stored at 15 Mbps in the recording memory 100 for recording. The amount of residual data in the memory for use 100 increases as shown in FIG.

Next, at time T3, the control circuit 102 detects that the remaining data in the recording memory 100 has reached a certain amount, or that the remaining data in the reproducing memory 101 has reached a certain amount or less. , The tape drive circuit 15, the recording processing circuit 11, and the recording memory 100 are controlled by control signals 107, 104, and 103, and the tape running is controlled as shown in FIG.
(B) as shown in (b), the tape is driven in this state until it reaches the tape position D at time T4 and the remaining amount of the recording memory becomes zero. During this time, the apparatus enters the recording state on the magnetic tape 2 and the recording memory 100
The reading of the data c1 at bps is performed in the order in which the data was stored. As shown in FIG. 5H, the block to be newly recorded at the tape position where the data c of the block C was recorded as the signal 109 The data c1 of C appears. The signal 109 is newly recorded from the beginning to the end where the block C is recorded, via the recording processing circuit 11. The data c1 is 60 Mbps, four times 15 Mbps.
Since the recording is performed in ps, the recording of the block c1 including the video and audio data of 15 Mbps is completed in 1/4 time. Further, since data is read at 60 Mbps in the recording memory 100, the amount of residual data in the recording memory 100 rapidly decreases as shown in FIG.

Next, the control circuit 102 sends a control signal 107 instructing the tape drive circuit 15 to perform “4 × speed reproduction” and a control signal 106 instructing the reproduction processing circuit 13 to perform a reproduction process. From time T4 to time T5, as shown in FIG. 5B, the magnetic tape 2 runs again in the “4 × speed reproduction” state, and reaches the tape position E at time T5 as shown in FIG. I do. During this time, the device is in the playback state, and FIG.
As shown in (e) of FIG.
Is output as a signal 108 of 60 Mbps and sequentially stored in the reproduction memory 101, and the amount of residual data in the reproduction memory 101 increases again as shown in FIG. During this time, reading from the reproduction memory 101 is continuously performed at 15 Mbps, and the signal d of the block D is output as the signal 18 without interruption.
During this period, as the signal 20, as shown in FIG. 5 (g), data d1 of the block D obtained by mixing the signal of the block D with the signal 110 from time T4 is continuously output from the mixing circuit 16 at 15 Mbps. Output and record memory 10
0 is sequentially stored at 15 Mbps.

Next, at time T5, the control circuit 102
Is the tape position E from the output signal 108 of the reproduction processing circuit 13.
Is detected, a control signal 107 for instructing a rewind command to the tape drive circuit 15 is sent, and the tape travels to the "REW" state as shown in FIG. Return to position D and stop. Here, in FIG. 5B, the time T5 and the start time of the “REW” state do not match, but this is because the control circuit 102 detects that the tape position E has been reached, and issues a rewind command. This is because quadruple-speed playback is performed until an instruction is issued and rewinding starts. From this time T5 to T6 when the tape starts next, neither recording nor reproduction on the magnetic tape 2 is performed.
However, during this time, as shown in FIG. 5F, the reading of data at 15 Mbps from the reproduction memory 101 is continuously performed, and the reproduction data of the signal 18 is not interrupted. As shown in FIG. 5D, the storage of the signal 20 at 15 Mbps in the recording memory 100 is also performed without interruption.

When the control circuit 102 detects at time T6 that the amount of residual data in the recording memory 100 has reached a certain amount, or detects that the amount of residual data in the reproduction memory 101 has reached a certain amount or less, the tape drive Circuit 1
5, the recording processing circuit 11 and the recording memory 100 are controlled by the control signals 107, 104 and 103, and the tape running is set to the "4x speed recording" state as shown in FIG.
In this state, the tape is run until the tape position E is reached.
During this time, the apparatus is in the recording state on the magnetic tape 2, and the data is read out from the recording memory 100 at 60 Mbps in the order in which the data was stored. As shown in FIG. The data d1 of the block D appears as a signal 109 to be newly recorded at the tape position where the data has been recorded. This signal 109 is transmitted to the recording processing circuit 11
, The block D is newly recorded from the beginning to the end where it was recorded. In addition, 6 times, four times of 15 Mbps
Since data is recorded at 0 Mbps, recording of data d1 of block D including video and audio data of 15 Mbps is 1/4.
It ends in time. Further, since data is read at 60 Mbps, the amount of residual data in the recording memory 100 rapidly decreases as shown in FIG.

By the operation up to this point, the signals c and d of the blocks C and D recorded on the magnetic tape
Was recorded again in its original location as signals c1 and d1 mixed with another audio signal. Thereafter, in a similar manner, the processes of reproduction, rewinding, and recording are repeated in a period from time T1 to T4.

In order to perform the above operations, the recording memory 100 and the recording processing circuit 11 perform intermittent reading operation and recording processing operation in accordance with control signals 103 and 104 from the control circuit 102, respectively. Also, the reproduction processing circuit 13,
The reproduction memory 101 performs intermittent reproduction processing operations and write operations in accordance with control signals 106 and 105 from the control circuit 102, respectively. Further, the tape drive circuit 15 controls the running of the magnetic tape according to a control signal 107 from the control circuit 102.

As a result of the operation described above, the video and audio signals already recorded in the blocks C to E can be mixed with another audio signal and recorded again at the original location.

As described above, in this embodiment, recording on the magnetic tape and reproduction from the magnetic tape are intermittently and alternately performed at a data rate higher than the data rates of the input and output video and audio. Thus, the signal already recorded on the magnetic tape and another signal can be mixed and recorded again at the original location without providing a preceding reproducing head.

An idle running period (not shown) is provided as a margin or a mode transition time between the recording operation and the reproducing operation.
May be provided.

The storage capacities of the recording memory 100 and the reproduction memory 101 can be easily constituted by semiconductor memories. However, when a signal having a higher data rate is handled, the required storage capacity becomes large, and if it is constituted by a semiconductor memory, it becomes expensive. In this case, a device provided with another storage medium such as a magnetic disk may be used. As a result, a large-capacity memory can be configured at low cost.

In the present embodiment, recording and reproduction of video and audio signals are performed intermittently every predetermined period of about 30 seconds. However, the present invention is not limited to this. It may be performed in a longer cycle.

In this embodiment, the video and audio signals are intermittently recorded or reproduced at four times the original data rate (N1 = N2 = 4). However, the present invention is not limited to this. On average 2 for the original data rate
The recording rate and the reproduction rate need not be the same as long as the rate exceeds twice. More specifically, if the reading speed of the first memory is set to N1 (N1> 1) and the writing speed of the second memory is set to N2, 1 / N1 + 1 / N2 <1 is set. By selecting the amount of memory, the write and read operations of the memory are not broken during the round operation from T1 to T4.

In general, the same number of reproducing heads as recording heads have the same recording speed and reproducing speed, and N1 =
N2, for example, in a cylinder of a non-tracking configuration in which the number of reproducing heads is greater than the number of recording heads as shown in FIG. N2> N1
It is possible to set FIG. 6 is a block diagram of a system when a cylinder having a non-tracking configuration is used. As in the conventional example, the reproduction signals from the non-tracking reproduction heads 35 and 36 are applied to the reproduction processing circuit 13 through the head switch 32, and the signals are reproduced from the tape by interpolating the original reproduction heads 5 and 6. By attaching an appropriate number of non-tracking reproducing heads in this way, it is possible to configure so that all data can be obtained even at a high reproducing speed at which data is lost only with the original reproducing head. For example,
The specification can be such that recording is 4 times speed and reproduction is 6 times speed. By using such a cylinder, the time required for reproduction is reduced, so the time required from T1 to T4 is also reduced, and the required memory amounts of the first memory and the second memory can be reduced. It is.

Further, the first memory and the second memory may be located anywhere in the recording process and the reproducing process, respectively. For example, in the case of a digital VTR for performing compression / expansion processing,
As shown in FIG. 7, the first memory (recording memory 100) inputs the edited data compressed by the compression means 112,
By inputting the output of the second memory (reproduction memory 101) to the decompression means 112 and performing decompression processing, it is possible to greatly reduce the amount of memory.

Further, the first memory, the second memory, the mixing circuit, etc. may be constituted by a memory on a computer using a personal computer or by software processing.

(Embodiment 2) Next, an information editing apparatus according to Embodiment 2 of the present invention will be described. The information editing apparatus of the present embodiment is configured such that the same pre-read editing function can be realized with about half the memory amount by using one common ring memory on the recording side and the reproducing side.

The arrangement of the heads on the rotary cylinder in this embodiment is exactly the same as that of the conventional cylinder shown in FIG. FIG. 8 shows the configuration of an information editing apparatus according to the present embodiment for editing an already recorded audio signal.
In FIG. 8, blocks and signals having the same functions as those of the conventional example and the information editing apparatus according to the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 8, reference numeral 203 denotes a ring memory which is a storage device in which addresses are connected like a ring.

In this embodiment, a signal to be recorded is continuously written to the ring memory 203 at the first data rate, and the second signal faster than the first data rate in the same order.
The data is read out intermittently at the data rate of The recording processing circuit 11 is subjected to shuffling processing, error correction coding, modulation and the like, and then given to the head switch 10 and recorded on the magnetic tape at the second data rate. The signals reproduced at the third data rate by the reproduction heads 5 and 6 and the non-tracking reproduction heads 35 and 36 are supplied to the reproduction processing circuit 13 as signals 22 and 38. The reproduction processing circuit 13 demodulates this signal, performs error correction, and performs deshuffling processing.
As the signal 108, the ring memory 203 and the control circuit 10
2 given. The ring memory 203 intermittently records the signal 108 reproduced at the third data rate, reads the signal 108 continuously at the first data rate in the recording order, and supplies the read signal to the mixing circuit 16. The mixing circuit 16 constitutes processing means for mixing the reproduced signal with other signals to generate the recording signal 20. The control circuit 102 includes a control signal 220,
The intermittent reproduction operation and the intermittent recording operation described above are alternately repeated in the ring memory 203, the reproduction processing circuit 13, and the recording processing circuit 11 by 104 and 106, and the tape drive circuit 15 is controlled by the control signal 107. The magnetic tape is rewinded at a high speed between the reproducing operation and the recording operation. The control circuit 102 receives the signal 108 reproduced from the magnetic tape and the address information 205 for each write / read operation of the ring memory, whereby the running position of the tape and the state of the memory are grasped to determine the timing of each control signal. Control. Here, the recording processing circuit 11,
The head switch 10 and the heads 3 and 4 constitute recording means for intermittently recording data read from the memory on the magnetic tape 2. Further, the reproduction processing circuit 13, the head switches 12, 32, and the heads 5, 6, 35, 36 constitute reproduction means for intermittently reproducing data from the magnetic tape 2 at the third data rate.

Next, a more specific operation will be described with reference to FIG. The first embodiment is now described on the magnetic tape 2.
4, each block is arranged, and another audio signal is mixed with the video and audio signals already recorded from the block C to the block E and recorded again at the original location. The operation in this case will be specifically described.

FIG. 9 is a timing chart for explaining the operation at this time. In FIG. 9, (a) shows the position of the tape in the longitudinal direction at each time by using an index shown in the lower part of FIG. FIG. 4B shows the running state of the magnetic tape 2, “6 × speed reproduction” (N 2 = 6) is a state in which the edited data is reproduced from the magnetic tape 2 at 6 × speed,
“REW” is a state in which the tape is rewound to the next recording start position and is waiting for recording timing, and “4 × speed recording” (N
1 = 4 <N2) is a state in which the edit data is recorded on the magnetic tape 2 at 4 × speed. FIG. 3C shows a write address R, a read address S, a write address P, and a read address Q at the time of recording and reproduction, respectively, on the ring memory.
The position of is shown. Further, FIG.
A signal 108 to be written to the block 03 and a signal (f) in FIG. 4 represent the contents of the signal 18 read from the ring memory 203 and subjected to data rate conversion, and c, d, and e described in FIG. This indicates that the signal is reproduced from blocks D and E. 4G shows the content of the signal 20 to be written to the ring memory 203, and FIG. 4H shows the content of the signal 109 read from the ring memory 203. c1 and d1 denote the blocks C and D in FIG.
A signal obtained by mixing another signal with a signal reproduced from, and represents a signal to be recorded again at the positions of blocks C and D. FIG. 3I shows the time from the start of the operation.

First, it is assumed that the tape position is at the tape position C at time 0 as shown in FIG. At time 0, the write address R and read address S during recording, the write address P and read address Q during reproduction are reset to 0 on the ring memory 203. The control circuit 102 sends a control signal 107 to the tape drive circuit 15 and a control signal 106 to the reproduction processing circuit 13, and the tape continues to move from the tape position C to the tape position D as shown in FIG. The vehicle runs in the "6x speed reproduction" state. Blocks C and D are recorded from the tape position C to the tape position D. Block C
As described above, the video and audio data of 15 Mbps are recorded in the block D, and the time to reach the tape position D in order to travel in the “6 × speed reproduction” state is as shown in FIG. It is time T2. During this time, the device is in the playback state.

During the period from time T1 to time T2, as shown in FIG.
The address P written at 03 is 6 times faster, the read address Q, and the write address R at the time of recording are on the ring at 1 time speed. At time T2 when the write address P catches up with the read address S To end. More specifically, the control circuit 102 detects that the difference between the address P and the address S has become equal to or smaller than a predetermined value, and outputs the tape drive circuit 15, the reproduction processing circuit 13, and the ring memory 203.
Control signals 107, 106 and 105 respectively to interrupt the reproducing operation. The signal 18 read from the ring memory 203 is converted into another audio signal 11 by the mixing circuit 16.
0 is mixed and becomes signal 20. As shown in FIG. 8, in the present embodiment, it is assumed that T1 is required for the process during this period. Therefore, the data c1 obtained by mixing the reproduced data of the block C with the signal 110 is output as the signal 20 from the mixing circuit 16 from time T1, as shown in FIG. 9 (g). The signal 20 is sequentially stored in the ring memory 203. Therefore, the write address R at the time of recording is sequentially increased from the time T1 with an address difference of only the read address Q on the reproduction side and T1.

Between time T2 and time T3, the control circuit 10
2 sends a rewind command to the tape drive circuit 15 by the control signal 107 to set the tape running to the "REW" state.
Here, in FIG. 9B, the time T2 and “REW”
The start times of the states do not match, but this
2 detects that the tape has reached the tape position D, instructs a rewind command, and performs 6 × speed reproduction until rewinding starts. The control circuit 102 is a reproduction processing circuit 13
When the tape position C is detected from the output signal 108, the tape driving circuit 15 stops the tape running by the control signal 107. During this time, neither recording nor reproduction on the magnetic tape 2 is performed. However, during this time, the signal 18 is output from the ring memory 203 at the first data rate (for example, 15 Mbps).
, And are not interrupted. The signal 20 is continuously stored in the ring memory 203.

The control circuit 102 determines whether the residual amount (address P-address Q) of the signal 18 read from the ring memory 203 is the time required to write the residual edit data to the tape at double speed, that is, the accumulated amount of edit data (address R
The control circuit 102 detects that it has approached one-third of the address S), and the tape drive circuit 15 and the recording processing circuit 1
1. By controlling the ring memory 203, at time T3, the tape running is set to the second data rate (for example, 60 Mbps in the case of quadruple speed recording) as shown in FIG. And the vehicle is driven in this state until there is no more data to be recorded. During this time, the apparatus enters the recording state on the magnetic tape 2 and the second
The data is read out at the data rate (60 Mbps) in the order in which the data was stored. As shown in FIG. 9 (h), the data is newly recorded at the tape position where the block C was recorded as the signal 109. Data c1 appears. The signal 109 is newly recorded from the beginning to the end where the block C is recorded, via the recording processing circuit 11.
In this example, since recording is performed at 60 Mbps, which is four times 15 Mbps, recording of data c1 including video and audio data of 15 Mbps is completed in 1/4 time.

From the time T3 to the time T4, as shown in FIG. 9C, the address S from which the signal to be recorded on the magnetic tape 2 is read is quadrupled, the read address Q and The write address R goes around the ring at one-time speed, and the recording operation ends at time T4 when the address S catches up with the write address R of the edited data. At time T4, the control circuit 102 controls the tape speed to be increased to 6 times the speed, and when the signal 108 output from the reproduction processing circuit 13 detects the next data after the reproduction data previously written in the memory, the tape starts from the reproduction timing T4. The state becomes the “6 × speed reproduction” again, and reaches the tape position E at the time T5 as shown in FIG. During this time, as shown in FIG.
Appears at 60 Mbps and is sequentially stored in the ring memory 203. During this period, reading from the ring memory 203 is continuously performed, and the signal d of the block D appears in the signal 18 without interruption. The signal d includes data d obtained by mixing the signal of the block D with the signal 110 from time T4 as shown in FIG.
1 continuously appear at 15 Mbps, and the ring memory 203
Are sequentially stored. Thereafter, in the same manner, the processes of reproduction, rewinding, and recording are repeated in a period from time T1 to T4.

In order to perform the above operation, the ring memory 203, the reproduction processing circuit 13, and the recording processing circuit 11
Control signals 205, 106, 104 from the control circuit 102
The operation is performed according to. Further, the tape drive circuit 15 controls the running of the magnetic tape according to a control signal 107 from the control circuit 102.

As a result of the operation described above, the video and audio signals already recorded in blocks C to E can be mixed with another audio signal and recorded again at the original location.

As described above, in this embodiment, recording on the magnetic tape and reproduction from the magnetic tape are intermittently and alternately performed at a data rate higher than the video and audio data rates, and a preceding reproduction head is provided. A digital VTR for broadcasting having a function of mixing a signal already recorded on a magnetic tape with another signal and recording the mixed signal again at the original location can be realized. By using a ring memory configuration for the memory for recording and the memory for reproduction, the memory can be realized with about half the memory amount as compared with the first embodiment.

The storage capacity of the ring memory 203 is as follows.
Although it can be easily constituted by a semiconductor memory, when a signal having a higher data rate is handled, the necessary storage capacity becomes large and it may be expensive. In this case, a device provided with another storage medium such as a magnetic disk may be used. As a result, a large-capacity memory can be configured at low cost.

In this embodiment, the video and audio signals are intermittently reproduced at six times (N2 = 6) the original data rate and recorded at four times (N1 = 4 <N2) the original data rate.
The present invention is not limited to this, but may be any rate that is substantially twice the average of the original data rate.

In the first and second embodiments, the already recorded signal and another signal are mixed and recorded again at the original location. However, the present invention is not limited to this.
The already recorded signal may be processed and recorded again at the original location, or only part of the track may be rewritten (for example, only the audio area is partially rewritten), and insert recording may be performed.

In the first and second embodiments, the timing for starting and ending the reproduction, rewinding, and recording is based on the state of each memory and the reproduction output from the tape. Absent. Also, a period of fantasy may occur between recording and reproduction. Further, the next recording may be started simultaneously with the end of the rewinding.

(Embodiment 3) The information editing apparatus according to the present embodiment performs high-speed reproduction and high-speed recording without providing a preceding reproduction head similarly to the first and second embodiments, and records information already recorded on a magnetic tape. The present invention relates to a broadcast digital VTR having a pre-read editing function of mixing a reproduced signal with another signal and recording the mixed signal again at an original location. In particular, to quickly detect when editing could not be performed normally due to clogging of the recording head, etc., a clogging detection function and a simultaneous playback function to check whether recording was possible by reproducing the location immediately after recording was realized Is what you do.

In the case of performing non-tracking reproduction using a plurality of heads, the simultaneous reproduction function cannot be realized due to crosstalk from the recording head to the non-tracking reproduction head, for example, when the track pitch becomes narrow due to long-time recording. Was. In the information editing apparatus of the present embodiment, the non-insert recording area uses reproduction data reproduced by non-tracking reproduction using a plurality of heads in advance, and the insert recording area uses simultaneous reproduction data from a one-channel head without crosstalk. To enable simultaneous reproduction. In addition, clogging of the head is detected by comparing the simultaneous reproduction output from the reproduction head during high-speed recording with the edit data.

The arrangement of the heads on the rotating cylinder of the broadcast D-VTR according to the present embodiment and the positional relationship between the recording track patterns on the magnetic tape 2 and the heads are shown in FIG.
0, exactly the same as FIG. FIG. 10 shows a configuration of an information editing apparatus that insert-edits another audio signal into a video and audio signal already recorded by the broadcast D-VTR according to the present embodiment. Note that blocks and signals having the same functions as those of the second embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 10, reference numeral 303 denotes a memory for simultaneous reproduction, and 304 denotes comparison means. In the recording / reproducing apparatus of the present embodiment, the input signal 109 of the recording processing circuit 11 is
The output signal 108 of the reproduction processing circuit 13 is connected to the comparison means 304. The simultaneous reproduction memory 303 is connected to the output signal 108 of the same reproduction processing circuit 13.
In the present embodiment, the operation of the simultaneous reproduction memory 303 and the comparing means 304 will be mainly described.

In this embodiment, as in the first and second embodiments, an operation of reproducing data written in an area to be edited by a high-speed reproduction operation and writing the data in a memory, a high-speed rewinding operation of a magnetic tape, and a read-ahead operation. Operation to return to the beginning of the area, read from memory, mix with other audio signals externally if necessary, or process and write it back to the memory as edit data, read the edit data from the memory, and quickly write to the tape By repeating the operation of writing back,
Pre-read editing operation is performed. Edit data is supplied from another external signal source, and may be a simple insert edit operation.

The comparing means 304 reads out the edited data from the ring memory 203, and during the operation of writing back to the tape at high speed, the data 109 to be recorded and the reproduction output 108 by the reproducing head immediately after recording are input. By comparing the differences, it is determined whether or not the recording was successful. If the recording head 3 or 4 is not properly recorded due to clogging, the previous data on the tape base is reproduced during that period, so that the comparison means 304 inputs data different from the edited data. , It can be detected that clogging has occurred. When such clogging is detected, a warning lamp can be turned on to notify the editing operator, so that a highly reliable editing VTR can be provided.

The simultaneous reproduction memory 303 synthesizes and records the data of the area recorded from the reproduction output during the high-speed recording operation and the base data put on the area to be edited during the high-speed reproduction operation, and outputs the data at 1 × speed. By doing so, it is possible to output simultaneously during editing. If this output is monitored, monitoring of head clogging, confirmation of video and audio timing, etc. can be performed at the same time, and further reliable editing can be performed.

As described above, in the present embodiment, the recording on the magnetic tape and the reproduction from the magnetic tape are intermittently and alternately performed at a data rate higher than the data rate of the video and audio data, so that the preceding reproduction head is used. Without providing a digital VTR, it is possible to realize a highly reliable broadcast digital VTR having a function of pre-reading a signal already recorded on a magnetic tape and performing simultaneous reproduction or clogging detection while performing insert recording.

(Embodiment 4) Embodiment 4 of the present invention
Is a broadcast provided with a pre-read editing function of mixing a signal already recorded on a magnetic tape with another signal without providing a preceding reproduction head and recording the original data again in the same manner as in the first to third embodiments. Digital VTR can be realized. The arrangement of the heads on the rotary cylinder of the broadcast D-VTR of this embodiment and the positional relationship between the recording track pattern and the heads on the magnetic tape 2 are exactly the same as those shown in FIGS. The recording / reproducing apparatus of this embodiment eliminates the memory on the reproducing side by performing the reproducing operation at 1 × speed.

FIG. 11 shows a broadcast D-VT according to the present embodiment.
FIG. 12 shows a configuration of an information editing apparatus for insert-editing another audio signal into a video and audio signal already recorded in R, and FIG. 12 shows a relationship between operation timings and signals of respective units. Note that blocks and signals having the same functions as those in the first to third embodiments are denoted by the same reference numerals, and detailed description is omitted. The edit data block on the tape is the same as in FIG. In this embodiment, the block C
To be edited.

First, as shown in FIG. 12B, under the control of the control circuit 102, from the tape positions C to D,
The read-ahead reproduction is performed at 1 × speed, and the reproduction output 18 is mixed with an external signal 110 by the mixing circuit 16 and then written into the recording memory 100 as edit data. As shown in FIG. 12 (f), the data c of the block C is used as the reproduction signal 18 at the time T from the time 0 to the tape position D.
Output up to 2. Also, as shown in FIG.
Since the processing time in the mixing circuit 16 requires the time T1, the data c1 in which the signal 110 is mixed with the data c from the time T1 is output as the signal 20 output from the mixing circuit 16.

At time T2, under the control of the control circuit 102, the magnetic tape 2 is rewound to the beginning of editing, and data is read from the recording memory at a quadruple speed from time T3 to time T4. Write back to tape. FIG. 12D shows a change in the amount of residual data in the recording memory 100. In general, if recording is performed at 4 × speed during recording and running at 1 × during reproduction, non-tracking reproduction is performed because the angle of the track and the angle operated by the head do not match.

The control circuit 102 controls the tape drive circuit 15, the reproduction processing circuit 13, the recording processing circuit 11, and the recording memory 100 according to each mode, as in the previous embodiments. Each transition timing may be managed based on the amount of remaining data in the memory, the output of reproduced data, or simply time, as in the previous embodiments.

In the present embodiment, since the reproduction is performed at 1 × speed, it is not possible to return and record before the next block is pre-read. That is, the editing time is stored in the recording memory 10.
Although it is limited by the time until 0 becomes full, writing can be performed at high speed, so that the time required for editing time does not increase so much. In addition, the memory amount can be reduced to half as in the second embodiment, and the circuit configuration can be simplified.

(Fifth Embodiment) An information editing apparatus according to a fifth embodiment of the present invention is different from the first to fourth embodiments in that a signal already recorded on a magnetic tape is provided without providing a preceding reproduction head. A broadcasting digital VTR having a pre-read editing function of mixing signals and recording the original data again can be realized. The arrangement of the heads on the rotating cylinder and the positional relationship between the recording track patterns and the heads on the magnetic tape 2 of the broadcasting D-VTR according to the present embodiment are exactly the same as those shown in FIGS. This embodiment eliminates the memory on the recording side by performing the recording operation at 1 × speed.

FIG. 13 shows a broadcast D-VT according to the present embodiment.
FIG. 14 shows the configuration of an information editing apparatus that insert-edits another audio signal into a video and audio signal already recorded in R, and FIG. 14 shows the relationship between operation timings and signals of each unit. Blocks and signals having the same functions as those of the first to fourth embodiments are denoted by the same reference numerals, and detailed description is omitted.

In this embodiment, first, as shown in FIGS. 14 (a) and (b), read-ahead reproduction is performed at 6 × speed from the tape position C to D under the control of the control circuit 102. The output 108 is the reproduction memory 101
Is written to. Next, as shown in FIGS. 14A and 14B, when the control circuit 120 detects that the magnetic tape 2 has been reproduced to the tape position D at the time T2, the control circuit 120 rewinds the magnetic tape 2 to the tape position C, and thereafter performs the recording operation. Is controlled. The control circuit 102 starts the reproduction memory 10 from time T3.
Control is performed such that reading is performed at 1 × speed from 1 before the delay time of the mixing circuit 16 from 1. The signal 10 read from the reproduction memory 102 is mixed with an external signal 110 in the mixing circuit 16 and then input to the recording processing circuit 11 as edit data and written back to the tape. FIG.
(C) shows a change in the address of the reproduction memory 101;
Residual data that has rapidly increased during 6-times speed reproduction gradually decreases during 1-times speed reproduction.

In general, in order to reproduce at 6 × speed during reproduction, non-tracking reproduction is often performed by increasing the number of heads or increasing the rotation speed of the cylinder. In this example, non-tracking reproducing heads 35 and 36 are added to increase the number of rotations. When recording, it is necessary to set the lead angle of the cylinder so that the number of rotations is returned or the number of cylinders is increased and the recording is performed in a thinned-out state, and a normal track can be recorded. The control circuit 102 controls the tape drive circuit 15, the reproduction processing circuit 13, the recording processing circuit 11, and the reproduction memory 101 according to each mode, as in the previous embodiments. Each transition timing may be managed based on the amount of remaining data in the memory, the output of reproduced data, or simply time, as in the previous embodiments.

In this embodiment, since the recording speed is 1 ×, the next block cannot be pre-read before the data in the reproduction memory runs out. That is,
The editing time is limited by the time until the reproduction memory becomes full, but the time required for the editing time does not increase so much. The memory amount can be halved as in the second embodiment, and the circuit configuration can be simplified.

(Embodiment 6) In Embodiment 6, a method of editing information in a cylinder on which a magnetic tape is wound obliquely and a rotary head is mounted will be described.

FIG. 15 is a flowchart showing the operation of the information editing method of the present invention.

In FIG. 15, reference numeral 1401 denotes a reproduction step for reading reproduction data from the cylinder rotating at N1 times (N1> 1) at the normal recording time at N2 times (N2>1);
02 is a rewind step of rewinding the magnetic tape to the head position read in the reproduction step, and 1403 is a recording step of recording edit data at N2 times speed using a cylinder.

First, in the reproducing step 1401, the cylinder is rotated at N1 (> 1) times the normal recording speed, and the reproduced data is read from the cylinder at N2 (> 1) times. Next, in a rewind step 1402, the magnetic tape is rewound to the read head position, and in a recording step 1403, edit data is recorded at N2 times speed from the read head position by the cylinder. Reproduction step 1401, rewind step 140
2. In the recording step 1403, the above operation is repeated in a predetermined section (step 1404).

Although the present invention has been described with reference to an example of a broadcast D-VTR, it goes without saying that the present invention is not limited to a digital VTR but is applicable to, for example, an optical disk or a hard disk.

[0103]

As is apparent from the above description, according to the present invention, a signal that has been recorded and another signal are mixed and recorded again at the original location without providing a preceding reproduction head. It is possible to provide an information editing apparatus having a pre-read editing function of processing a signal that has already been recorded and recording the signal again at the original location.

Further, the edited data compressed by the compression means is input to the first memory, and the output of the second memory is decompressed by the decompression means, so that the amount of memory can be significantly reduced. It becomes possible.

Further, by comparing the read output of the first memory with the output of the reproducing means during recording and providing a comparing means for outputting the comparison result, it is possible to detect clogging during pre-read editing.

Further, by providing a third memory for writing the output of the reproducing means during reproduction and recording and reading it out as a simultaneous reproduction output, a simultaneous reproduction output during pre-read editing can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an information editing device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a head arrangement on a rotary cylinder according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a positional relationship between a recording track pattern on a magnetic tape and a head according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a recording state on a magnetic tape.

FIG. 5 is a timing chart illustrating the operation of the first embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of an information editing device in a non-tracking configuration according to the first embodiment of the present invention;

FIG. 7 is a block diagram showing another configuration of the information editing device according to the first embodiment of the present invention;

FIG. 8 is a block diagram illustrating a configuration of an information editing device according to a second embodiment of the present invention.

FIG. 9 is a timing chart illustrating the operation of the second embodiment of the present invention.

FIG. 10 is a block diagram illustrating a configuration of an information editing device according to a third embodiment of the present invention.

FIG. 11 is a block diagram illustrating a configuration of an information editing device according to a fourth embodiment of the present invention.

FIG. 12 is a timing chart illustrating the operation of the fourth embodiment of the present invention.

FIG. 13 is a block diagram illustrating a configuration of an information editing device according to a fifth embodiment of the present invention.

FIG. 14 is a timing chart illustrating the operation of the fifth embodiment of the present invention.

FIG. 15 is a flowchart illustrating the operation of the sixth embodiment of the present invention.

FIG. 16 is a diagram showing a head arrangement on a rotary cylinder of a conventional information editing apparatus.

FIG. 17 is a diagram showing a positional relationship between a recording track on a magnetic tape and a head in a conventional information editing apparatus.

FIG. 18 is a block diagram showing a configuration of a conventional information editing device.

FIG. 19 is a timing chart illustrating the operation of a conventional information editing device.

FIG. 20 is a diagram showing a head arrangement on a rotating cylinder in a conventional information editing apparatus.

FIG. 21 is a diagram showing a positional relationship between a recording track pattern on a magnetic tape and a head in a conventional information editing apparatus.

FIG. 22 is a block diagram showing a configuration of a conventional information editing device that performs non-tracking reproduction and simultaneous reproduction.

[Explanation of symbols]

 Reference Signs List 1 rotating cylinder 2 magnetic tape 3, 4 recording head 5, 6 reproduction head 10, 12, 32 head switch 11 recording processing circuit 13 reproduction processing circuit 15 tape drive circuit 16 mixing circuit 35, 36 non-tracking reproduction head 100 recording medium Memory 101 reproduction memory 102 control circuit 203 ring memory 304 comparing means 307 simultaneous reproduction memory

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/783 H04N 5/782 A 5/91 5/91 N 5/93 5/93 Z (72) Invention Person Kenichi Honjo 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. HL14 5D110 AA04 AA29 CA05 CA18 CA19 CB06 CK02 CK30

Claims (22)

[Claims] 1. A tape driving means for driving a magnetic tape; a reproducing means for intermittently reproducing reproduction data from the magnetic tape driven by the tape driving means at a high speed; and the reproduction data reproduced by the reproducing means. A second memory for writing and reading continuously, a first memory for continuously writing and reading edited data, and a tape drive for driving the magnetic tape after rewinding the magnetic tape by the tape drive. Recording means for intermittently recording the edit data read from the first memory onto the magnetic tape at high speed; and control means for controlling the operation of each means. The rewinding, all of the respective means to sequentially repeat the high-speed recording operation, or
An information editing device characterized by partially controlling it. 2. A system according to claim 1, further comprising a compression unit for compressing the edited data and a decompression unit for decompressing the edited data. 2. The information editing apparatus according to claim 1, wherein the information is input to the means and decompressed. When the read speed of the first memory is N1 times speed (N1> 1) during normal recording and the write speed of the second memory is N2 times speed (N2> 1) during normal reproduction,
2. The method of claim 1, wherein / N1 + 1 / N2 <1.
Information editing device as described. 4. The information editing apparatus according to claim 4, wherein N2> N1. 5. A processing device comprising a processing means for subjecting reproduction data read from the second memory to predetermined processing and supplying the processed data to the first memory as edited data.
Information editing device as described. 6. An information editing apparatus according to claim 1, wherein said recording means performs insert recording for rewriting a part of data on the magnetic tape. 7. The information editing apparatus according to claim 1, wherein the first memory and / or the second memory includes a magnetic disk. 8. The first memory and the second memory write and read edit data, and write reproduction data,
2. The information editing apparatus according to claim 1, comprising one storage device for reading. 9. The information editing apparatus according to claim 8, wherein the storage device is a ring memory. 10. The information editing apparatus according to claim 8, wherein the storage device is a magnetic disk. 11. The information according to claim 1, further comprising comparison means for comparing the edited data read from the first memory with the reproduced data reproduced by the reproducing means during recording, and outputting a comparison result. Editing device. 12. The information editing apparatus according to claim 1, further comprising a third memory for writing the output of the reproducing means during reproduction and recording and reading the output as a simultaneous reproduction output. 13. A tape driving means for driving a magnetic tape, a memory for continuously writing and reading editing data, and a magnetic tape driven by the tape driving means after the magnetic tape is rewound by the tape driving means. Recording means for intermittently recording the edited data read from the memory on a tape at a high speed; reproducing means for intermittently reproducing reproduced data at a high speed from the magnetic tape driven by the tape driving means; Control means for controlling the operation of the above, the control means, all of the means to repeat the high-speed reproduction, the rewind, the high-speed recording operation sequentially, or,
An information editing device characterized by partially controlling it. 14. A tape driving means for driving a magnetic tape, and recording for intermittently recording edit data at high speed on a magnetic tape driven by the tape driving means after rewinding the magnetic tape by the tape driving means. Means, a reproducing means for intermittently reproducing reproduced data from the magnetic tape driven by the tape driving means, a memory for writing the reproduced data reproduced from the reproducing means and continuously reading the reproduced data, Control means for controlling the operation of the above, the control means, all of the means to repeat the high-speed reproduction, the rewind, the high-speed recording operation sequentially, or,
An information editing device characterized by partially controlling it. 15. A cylinder on which a magnetic tape is wound obliquely and on which a rotary head is mounted; tape driving means for driving the magnetic tape; and reproduction data with the rotary head from the magnetic tape driven by the tape driving means. A reproducing unit that intermittently reproduces the magnetic tape at high speed at N2 times speed (N2> 1) during normal reproduction, and after the magnetic tape is rewound by the tape driving unit, the rotation is performed to the magnetic tape driven by the tape driving unit. Recording means for recording the edited data at a high speed N2 times at the time of normal reproduction by a head; rotating the cylinder at N1 times speed (N1> 1) at the time of the normal recording; An information editing apparatus characterized by sequentially repeating a recording operation. 16. The relationship of 1 / N1 + 1 / N2 <1 is N
The information editing apparatus according to claim 15, wherein 1 and N2 are set. 17. The information editing apparatus according to claim 15, wherein N2> N1. 18. The information editing apparatus according to claim 15, wherein said recording means performs insert recording for rewriting a part of data on the tape. 19. A reproducing step in which a magnetic tape is wound obliquely, a rotating head is mounted, and reproduction data is reproduced at a high speed N2 times (N2> 1) from a cylinder rotating at N1 times (N1> 1) at the time of normal recording. A rewinding step of rewinding to the head position read in the reproduction step; and a recording step of recording edited data at N2 speed at a high speed by the cylinder. The high speed reproduction, the rewinding, and the high speed recording are sequentially repeated. An information editing method characterized in that: 20. The relationship of 1 / N1 + 1 / N2 <1 is N
20. The information editing method according to claim 19, wherein 1 and N2 are set. 21. The information editing method according to claim 19, wherein N2> N1. 22. The information editing method according to claim 19, wherein the recording step performs insert recording for rewriting a part of data on the magnetic tape.