JPH02158984A - Method and device for editing digital signal - Google Patents

Abstract

PURPOSE:To efficiently edit digital signals by incorporating a fixed length editing memory in a VTR. CONSTITUTION:A tape reproduced digital audio signal and an input digital audio signal from terminals 23 and 24 are written in a tape memory 61 and a source memory 62 until an entry key (EK) of an operation switch 19 is depressed, and signals for a certain time before the present input signal are always stored there. When the EK is depressed, a stop command is inputted to a W address counter (AC) 29 by a system controller (SC) 18 after the holding state, and an address just preceding the stop address is transferred to a RAC 31 to output a start signal. A memory address switching multiplexer 25 supplies the output of the counter 31 to the memory 61 to read out contents by a request after the stop command is outputted from the SC 18. Consequently, when the EK is depressed in the editing mode, audio information for several tens seconds before and after this depression is stored in the memory 61 and can be reproduced and monitored any number of times by a rehearsal request. Thus, signals are efficiently edited.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for editing digital signals in a VTR capable of recording digital audio.

2. Description of the Related Art In recent years, in the commercial field used in broadcasting stations, studios, etc., the development of digital VTRs that record video and audio in digital signal format and VTRs that only digitize audio have been actively promoted.

In this case, it is a prerequisite that the editing controller of the conventional analog VTR can be used as is in the video and audio editing work. In this case, the plurality of VTRs exchange control signals such as timing signals and mode signals via the editing controller, and the video and audio signals themselves are not processed by the controller, but by connecting the VTRs together.

In general, when comparing video and audio editing, video requires only frame-by-frame editing (NTSC: 33m5ec), but in the case of audio, this level may not be sufficient depending on the purpose. If audio is digitized and the quality is significantly higher than before, it would theoretically be possible to edit it down to the sample level.

Therefore, the unit of audio editing has been improved compared to the past, for example, l
The demand for achieving high-precision editing comparable to that of m5ec continues to increase.

Problems to be Solved by the Invention However, as shown in FIG. When editing with an editing controller, editing can only be done in units of audio recording areas separated by the editing gaps shown in the figure, making it difficult to edit with high precision. Required a dedicated editing controller.

Additionally, as an editing function necessary for audio, there is a spot erase function that performs extremely short-term erasure. For example, this is a function to erase unnecessary noise mixed in during recording, but when using the previously mentioned tape format in units of fields or units of segments, it can only be erased in units of fields, and in this case too, it is possible to erase unnecessary noise etc. in units of fields or segments. A spot erase function in units was desired.

Furthermore, when editing inserts or assembling, if the number of parts to be inserted or added is short and large, it is necessary to perform editing from rehearsal, check the results, and repeat between two VTRs. Driving the tape, determining the edit point in playback mode, pre-rolling (rewinding), rehearsing in synchronous playback mode, rewinding, and executing editing by switching from synchronous playback mode to recording mode.
It was extremely troublesome to repeat the operations.

In view of the above points, the present invention provides a method for converting conventional digital audio
The purpose of the present invention is to provide a digital signal editing method and an editing device that can improve the accuracy of editable units and spot erase sections in TR audio editing, and efficiently perform repeated editing of short sections.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method for editing digital audio in TR, in which a digital audio input signal and a reproduced digital audio signal are written into a memory by an external operating means. By constantly updating and storing the memory contents until a stop signal is received, and when determining an edit point in the edit mode, by repeatedly executing a reproducing step of reading and reproducing the stored contents from the memory,
determining an editing switching point in the digital audio input signal and the reproduced digital audio signal, and when performing in-point editing, switching the editing recording side VTR from playback mode to recording mode at a point upstream from the editing point where recording can be switched; Thereafter, the stored contents of the memory are recorded, and when editing is executed at the out point, the editing recording side VTR that is recording the stored contents of the memory is changed from the recording mode to the playback mode at a point downstream from the editing point where recording can be switched. This is to switch to .

Effects of the present invention By using the method described above, the input and playback tape signals during editing are always stored in the memory, detailed editing points can be quickly set by repeatedly reading them from the memory, and the audio recording area is divided into fields or segments. Even when using a general tape format divided into units, editing can be performed by selecting editing units in detail.

Embodiments Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a digital signal editing device according to an embodiment of the present invention. In the figure, 1 is an analog audio signal input terminal, 2 is a digital audio signal input terminal, 3 is an A/D converter, and 4 is a digital input interface circuit (DIF
), 5 is an analog/digital input changeover switch, 6 is an editing memory that can store digital audio signals for a certain period of time from several seconds to several tens of seconds, 7 is a memory controller that controls the address of the editing memory 6, etc. 9 is a recording circuit (RFC), 10 is a recording head, 11 is a playback head, 12 is a playback circuit (PB), 13 is a playback monitor changeover switch, 14 is a D/A. Converter, 15 is a digital output interface (DIF), IEi is an analog audio output terminal, 17 is a digital audio output terminal, 18
19 is a system controller that controls the mode and timing of the VTR; 19 is a VTR (7) operation switch; 20
C) A display is attached to the front panel of the VTR and is capable of displaying various types of information in graphics; 21 is a display controller; 22 is a pointing device such as a mouse;

FIG. 2 is a detailed configuration diagram of the editing memory 6 and the memory controller 7 shown in FIG. 1. In the figure, 23 is a tape playback digital audio signal input terminal, 24 is an input digital audio signal input terminal, and 61 is a tape memo 1 in the editing memory 6 that stores the tape playback digital audio signal 62
is the source memo 1c which also stores the input digital audio signal; 25.26 is the memory at/no switch multiplexer (MUX); and 27 is the tape memory 61 at the editing point.
, a multiplexer (MUX) for switching the readout output of the source memory 62; 28 is a playback signal output terminal from the tape memory 61 and the source memory 62; 29 and 30 are W for supplying write addresses to the tape memory 61 and the source memory 62, respectively. Address counters 31 and 32 are R address counters that supply read addresses to the tape memory 61 and the source memory 62, respectively, and the same numbers as those in FIG. 1 are assigned the same numbers.

FIG. 3 is a diagram showing the timing of editing in the editing memory 6 and the processing flow of each step, taking the case of the in-point of editing as an example.

FIG. 4 is a diagram showing the timing at the time of editing in the editing memory and the processing flow of each step, similar to FIG. 3, and shows the case of the out point of editing as an example.

In FIGS. 3 and 4, the marks indicate editing points (entry points), and the points marked with a scale on the tape indicate the points of editing gaps divided into fields or segments.

FIG. 5 is a diagram of the internal state of the editing memory 6 during spot erase editing, FIG. 6 is a plan view of the display screen of the display 20, and FIG. 7 is a commonly used digitized audio VT.
It is a tape format diagram of R.

Next, the operation will be explained according to the drawings. -In the case of VTR editing, first, input sources are inserted or assembled onto a tape that has already been recorded using a single VTR, and when only audio is recorded, it is called dubbing. ing.

In addition, there is a form of using an editing controller and two or more VTRs, especially multiple VTRs on the source side, and recording on one VTR while selecting the source VTR, but in the present invention, the editing controller does not perform signal processing. Therefore, no distinction will be made in this regard, and since the description will be based on the case of one VTR shown in FIG. 1, a description of editing of multiple VTRs using an editing controller will be omitted. Furthermore, in order to facilitate understanding of the drawings, VTRs not directly related to the present invention are shown.
The video signal processing part was omitted, and the audio channel was also omitted to one system.

An analog audio signal input from terminal 1 is converted into a digital signal by A/D converter 3.

The digital audio signal inputted from the terminal 2 is separated into digital audio data from the AES/EBUJj format by the digital input interface circuit 4, and the switch 5 selects one of the inputs. Furthermore, the input signal is once input to the editing memory 6, and the writing operation is always performed, but in order to send the signal to the recording circuit 9 without any time delay except when used in the editing mode, the input signal is once input to the editing memory 6. Provide a path for the signal to pass through. In a mode other than the editing mode, the signal passed through the editing memory 6 is inputted to the recording circuit 9 via the crossfader 8.

In the editing mode, the crossfader 8 has a function of fade-in/out processing the levels of the sounds before and after the editing point in order to smooth the connection between the sounds before and after the editing point, and allows the input signal to pass through as is except when editing. The recording signal output from the recording circuit 9 drives the recording head 10 to record on the tape.

In the playback operation, the signal detected from the tape by the playback head 11 is subjected to processing such as error correction in the playback circuit 12, and then
When not editing, the data is input to the D/A converter 14 and the digital output interface circuit 15 via the switch 13,
Analog audio signals, AES/E from terminals 16 and 17 respectively
Outputs BU standard digital signals.

Next, the operation during editing will be described in detail. In response to a signal from the operation switch 19, the system controller 18 sets the memory controller 7 and crossfader 8 to the editing mode. The operations of the editing memory 6 and the memory controller 7 will be described in detail based on the drawing of FIG.

The tape playback digital audio signal input from the terminals 23 and 24 and the input digital audio signal are transmitted through the operation switch 1.
The data is written to the tape memory 61 and the source memory 62 until the entry key 9 is pressed. That is, the W address counters 29 and 30 continue to generate addresses at a cycle corresponding to the memory capacity (storage time), the MUX 25 and 26 select the write address, and the tape memory 61 and source memory 62 always generate addresses that are currently input. The audio signal up to the point in time when the signal exceeds the current signal for a certain period of time is stored.

Next, when the input key of the operation switch 19 is pressed to enter an edit point on the tape side, for example, a stop command is input to the W address counter 29 from the system controller 18 after a standby state for a certain period of time. The address one address ahead of the stop address of the W address counter 29 is passed to the R address counter 31 and becomes a start signal for the R address counter 31. After the stop command is issued from the system controller 18, the MUX 25 supplies the output of the R address counter 31 to the tape memory 61.
When a request for memory playback is received, the contents of the tape memory 61 are read out.

Therefore, when IJ- is pressed in the edit mode, the audio information for several tens of seconds before and after that point is stored in the tape memory 61, and can be reproduced and monitored as many times as there is a rehearsal request. Although not shown in detail in the drawing, the editing point, that is, the read start address of the memory 61, can be finely tuned by, for example, operating the jog dial on the front of the VTR and shifting the preset value of the R address counter 31 via the system controller 18. You can decide.

Exactly the same operation is repeated for the source memory 62 to determine the edit point on the source side.

The reproduction outputs of the tape memory 61 and source memory 62 can be continuously monitored by switching the MUX 27 at each editing point, and are output to the terminal 28.

FIGS. 3 and 4 are diagrams illustrating the above-mentioned editing point entry and rehearsal on the memory in an easy-to-understand manner, showing the case of editing in-point and out-point, respectively.

In either case, (A) shows the entry state of the edit point, and shows the situation in which the audio information after the entry point up to the stop point is stored in memory, and is indicated by a scale where restrictions are imposed by the tape format. This indicates that the edit point is selected regardless of the edited edit gap. (B) shows the flow of playback during memory rehearsal. (C) shows the timing of switching from playback to recording or from recording to playback during editing, and shows that the editing point can be determined at a point different from the editing gap, as mentioned earlier. There is.

In addition, in the case of a two-editing system, for example, if the period of insert editing is short and is within the capacity of memory 6, it is efficient to record the memory contents as they are on the recording VTR without moving the source VTR. be. Therefore, even when editing short phrases repeatedly, it is more effective to edit them in memory instead of using a tape system.

This concept can also be applied to the spot erase operation shown in FIG. In other words, conventionally, due to tape format restrictions, spot erasing could only be done in field units or segment units, but while repeating memory rehearsal, the erase gate shown in Figure (B) can be adjusted using the jog dial mentioned earlier. You can easily clear the data in any section by generating the data while determining the points.

If the memory data in (A) is written, only the cleared data portion will be erased.

Furthermore, the present invention realizes an editing function using a display. That is, the output of the editing memory 6 shown in FIG. 1 can be sent to the display 20, and the reproduced output waveform at the time of memory reversal can be displayed.

By selecting with the operation switch 19, the display controller 21 can be controlled and displayed on an easy-to-read time axis.

Furthermore, the pointing device 22 can be used to further enhance the spot erase function described above. As shown on the display screen in Figure 6, point A-
In this case, high-level noise is mixed in between points A and B, as shown by the wavy line, but the conventional spot erase function only inserts zero data between points A and B, so it is difficult to reproduce the sound. That was not enough. In the present invention, it is possible to perform interpolation editing between points A and B using a curve while looking at the display 20 using the pointing device 22, and write the edited data into the editing memory 6 again, which has a great effect on improving the reproduced sound quality.

Further, C in FIG. 6 indicates points corresponding to the reproduced waveform during memory rehearsal in the form of markers, and may also be indicated as bright spots on the waveform. By combining this waveform display function, detailed editing points can be determined effectively both visually and audibly, which is a great advantage as a high-precision editing method.

Effects of the Invention In the present invention, when performing digital audio editing using a conventional editing controller, the VTR has a built-in editing memory of a certain length, and detailed editing point determination and editing rehearsal are repeatedly performed on that memory at high speed. It is much more efficient than traditional tape editing. Furthermore, when performing a spot erase operation, it is possible to reproduce the waveform of the erased part, which is very effective.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a digital signal recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a detailed configuration diagram of the vicinity of the editing memory shown in FIG. 1, and FIG. FIG. 4 is an explanatory diagram showing editing steps at an out point, similar to FIG. 3. FIG. 5 is a state diagram of the editing memory 6 during spot erase editing, and FIG. 6 is a display diagram. 7 is a plan view of the display screen of FIG. 7, which is a diagram of the tape format of the audio digitizing VTR. 6...Editing memory, 7...Memory controller, 18...System controller, 19...t
fi-made switch, 20...display, 2
1... Display controller, 22... Pointing device, 29.30... W address counter, 31.32... R address counter,
61...Tape memory, 62...Source memo 'J. Name of agent: Patent attorney Shigetaka Awano, 1 person, 24-m
-Human power Tiji 91L, Jin Sei 4 words 5 3rd encyclopedia Niu Mo Y---qi turtle t-￥ --------No. 4
Figure (c) 1st entry of the thread-biased headlight.
Figure (3) Issu Gate ￥6 Figure Man 7 Figure

Claims (1)

[Scope of Claims] (1) A method of editing the digital audio using a VTR that forms a digitized audio signal into a video and an inclined track for the audio signal using a rotary head, and performs recording and playback. , the digital audio input signal and the reproduced digital audio signal are written into the memory from an external operating means, and the stored contents are constantly updated and stored until a stop signal is received, and when the editing point is determined in the editing mode, the data is stored from the memory. By repeatedly executing the playback step of reading and playing back the contents, the editing switching point in the digital audio input signal and the reproduced digital audio signal is determined, and when performing in-point editing, the editing recording side VTR is moved upstream from the editing point Switch from playback mode to recording mode at a point where recording can be switched, and thereafter record the memory contents of the memory, and when editing at an out point, change the memory contents of the memory at a point downstream from the editing point where recording can be switched. Edit recording side VT while recording
A digital signal editing method characterized by switching R from recording mode to playback mode. (2) The digital signal editing method according to claim 1, wherein during a spot erase operation, data in an arbitrary section of memory contents is erased. (3) An apparatus for recording and reproducing at least digitizing audio signals and forming inclined tracks for video and audio signals using a rotary head, comprising memory means for storing a predetermined length of time of the digital audio input and the reproduced digital audio. The memory contents of the memory means are constantly updated until a write stop signal is received from the external operation means, and the stored contents of the memory means are continuously updated until a write stop signal is received from the external operation means, and the stored contents are continuously updated by digital audio input signals and reproduced digital audio signals of a certain length of time before and after receiving the stop signal. and, when determining an edit point in an edit mode, repeatedly reads and reproduces the stored contents of the memory means to determine an edit switching point in the digital audio input signal and the reproduced digital audio signal. When performing in-point editing, the editing/recording side VTR is switched from playback mode to recording mode at a point upstream from the editing point where recording can be switched, and thereafter the stored contents of the memory are recorded, and editing is performed at the out-point. A digital signal editing device comprising means for switching an editing/recording side VTR, which is currently recording the contents of the memory, from a recording mode to a playback mode at a recording switching point downstream of an editing point at the time of execution. (4) means for displaying the stored contents of the memory means in a waveform on an arbitrary time axis on a display device attached to the VTR, and when reproducing the stored contents of the memory means, a reproduction point corresponding to the displayed waveform on the time axis; 4. The digital signal editing apparatus according to claim 3, further comprising means for displaying a waveform on the display using a pointing device such as a cursor or a mouse.