JPH08237594A - Video and audio recording and reproducing device - Google Patents

Abstract

PURPOSE: To provide a video and audio recording and reproducing device which is capable of designating the storage location of the sound within the frame of video signal by storing the digital sound signal recorded in a recording frame in a storage means before an erasing processing is performed for the signal. CONSTITUTION: A digital video signal is recorded from the beginning of a frame 6 and a digital audio signal is recorded from the intermediate timing of the frame 6. When an actual recording is started, the recorded digital sound signal A6 is read from an advance reading part 4 by a control part 10 by the timing before two frames and is stored in an audio data recording part 6. Next, the stored digital video signal V6 and the digital audio signal A6 are erased from a recording medium by an erasing part 5 by the timing before one frame of the start of the recording. In this case, the recorded digital video signal V6 is completely erased and the recorded digital audio signal A6 is preserved in a the audio data recording part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio recording / reproducing apparatus, and more particularly to a video / audio recording / reproducing apparatus having an audio editing processing function.

[0002]

2. Description of the Related Art In a conventional video / audio recording / reproducing apparatus, for example, a video tape recorder (VTR) for broadcasting, recording / reproducing of a moving image is performed with reference to a time code. NTSC
In the case of the system, one second is composed of 30 frames, and recording / reproduction is performed in frame units by designating start / end frames with a time code.

FIG. 4 is a block diagram of a conventional video / audio recording / reproducing apparatus. A conventional video / audio recording / reproducing apparatus converts an analog video input signal into a digital video input signal by A /
D converter 1a, A / D converter 1b for converting an analog audio input signal into a digital audio input signal, and a recording unit for recording these digital video / audio input signals on a recording medium (magnetic tape or magneto-optical disk) 2, a reproducing unit 3 for reproducing the digital video / audio signals recorded on the recording medium, an erasing unit 5 for erasing the recorded frames prior to recording, and a digital video signal reproduced by the reproducing unit 3. D / A converter 7 for converting into an analog video signal
a, a D / A converter 7b for converting a digital audio signal reproduced by the reproducing unit 3 into an analog audio signal, and a control unit 2 for controlling the recording unit 2, the reproducing unit 3 and the erasing unit 5.
It consists of 0.

In the video / audio recording / reproducing apparatus having the above-described structure, the video / audio signal is converted into a digital signal by the A / D converters 1a and 1b, and then recorded in the recording medium by the recording unit 2 in frame units.

Next, the operation of this video / audio recording / reproducing apparatus will be described. FIG. 5 is a recording timing chart of the video / audio recording / reproducing apparatus, and FIG. 6 is a flowchart showing an audio recording procedure of the video / audio recording / reproducing apparatus.

In FIG. 5, V1 to V7 are video signals to be recorded (1 to 7 are frame numbers.
The same applies to A7 1-7. ), A1 to A7 are audio signals to be recorded, (V1) to (V7) are video signals recorded on the recording medium, and (A1) to (A7) are audio signals recorded on the recording medium.

The case of recording from the frame 6 of FIG. 5 (H) will be described. The recording position for both video and audio signals is 1
Video signal (V6) recorded at the timing before the frame,
The recorded audio signal (A6) is erased (see (G) in the figure), and the input video signal V6 and the input audio signal A6 are recorded in the erased frame at the timing of the next frame ((H) in the figure). reference).

That is, in the recording of the audio signal in FIG. 6, first, the recorded audio signal (A6) is erased at a timing one frame before the recording position at S20, and then at the timing of the frame at the recording position at S21. Record the audio signal A6. In this way, a series of audio recording processing is performed in synchronization with the frame of the video signal.

Further, as a prior art for recording an audio signal in synchronization with a video signal, (1) JP-A-60-212874.
Japanese Patent Laid-Open Publication No. 10-96952 discloses a digital signal recording / reproducing in which when the sampling frequency of the audio signal is not a positive multiple of the vertical synchronizing signal, dummy samples are added to the fields where the samples of the audio signal are insufficient and the number of samples in each field is recorded as the same number A device is disclosed, and (2) JP-A-62-23948
No. 7 discloses a digital audio signal for decoding the additional code in the PCM signal reproduced by the preceding reproducing head to detect the position of the head address of the AES block, and controlling the phase of the AES block of the input signal by the head position. Japanese Patent Laid-Open No. 63-164.
In Japanese Patent No. 683, the audio signal is time-axis-compressed and recorded as an audio track parallel to the video track, so that it is possible to record the audio signal accompanying the sampling recording of the video signal for a long time. A long-time magnetic recording / reproducing apparatus is disclosed.

[0010]

However, the conventional video / audio recording / reproducing apparatus can record the audio only in the frame unit of the video signal. Therefore, there is a drawback that the recording position of the audio cannot be specified within the frame of the video signal.

Further, the prior arts (1) to (3) do not disclose the technology for designating the recording position of the sound in the frame of the video signal.

Therefore, an object of the present invention is to provide a video / audio recording / reproducing apparatus capable of designating a recording position of audio within a frame of a video signal.

[0013]

In order to solve the above-mentioned problems, the present invention is a video / audio recording / reproducing apparatus for recording and reproducing a digital audio signal on a recording medium in synchronization with a video signal, the digital audio signal recording Prior to the previous erasing processing, a pre-reading means for reading the digital audio signal of one frame before being erased from the recording medium, and a storage means for storing the digital audio signal read by the pre-reading means, Selecting means for selecting either one of the digital audio signal read from the storage means or the digital audio signal inputted from the outside,
Recording means for recording the digital audio signal selected by the selecting means on the recording medium, and causing the selecting means to select the digital audio signal read from the storage means from the timing of the start of the recording start frame, and then And a control means for selecting the digital audio signal input from the outside from an intermediate timing within the frame.

[0014]

The digital audio signal recorded in the frame to be recorded is stored in the storage means before the erasing process. Next, the control means causes the selection means to select the digital audio signal read from the storage means from the start timing of the recording start frame, and then selects the digital audio signal input from the outside from the intermediate timing in the frame. Then, the selected digital audio signal is recorded in the recording means.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of an embodiment of a video / audio recording / reproducing apparatus according to the present invention. In the following drawings, the same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

The video / audio recording / reproducing apparatus according to the present invention is different from the conventional apparatus in that the pre-reading section 4 for reading out the digital audio signal already recorded in the frame from the recording medium before the erasing process and the pre-reading section 4 are provided. A voice data storage unit 6 for storing the digital voice signal read by the reading unit 4 and an input for selecting either the digital voice signal stored in the voice data storage unit 6 or the digital voice signal input from the outside. In addition to the switching unit 8, the output switching unit 9 for switching on / off the output of the digital audio signal, the recording unit 2, the reproducing unit 3, and the erasing unit 5, the pre-reading unit 4, the audio data storage unit 6, the input The control unit 10 for controlling the switching unit 8 and the output switching unit 9 is newly provided.

A magnetic tape or a magneto-optical disk can be used as the magnetic recording medium, but the magnetic recording medium is not limited to these and may be any other medium as long as it can record and reproduce video and audio.

Further, in the present embodiment, since analog signals are input for both video and audio, A / D converters 1a, 1b and D / D converters are used.
Although it is necessary to provide the A converters 7a and 7b and process them after converting them into digital signals, these are not necessary when both video and audio are digital signal inputs.

Next, the operation of this video / audio recording apparatus will be described. 2 is a recording timing chart of the video / audio recording / reproducing apparatus, and FIG. 3 is a flowchart showing a procedure of audio recording of the video / audio recording / reproducing apparatus.

In FIG. 2, V1 to V7 are video signals to be recorded (1 to 7 are frame numbers.
The same applies to A7 1-7. ), A1 to A7 are audio signals to be recorded, (V1) to (V7) are video signals recorded on the recording medium, and (A1) to (A7) are audio signals recorded on the recording medium.

In FIG. 2, (A) is the recording timing of the video / audio signal to be recorded, (B) is the recording timing of the recorded video / audio signal, (C) is the timing of pre-reading and erasing of the audio signal, ( D) shows the recording start position timing of the video / audio signal.

Although the video signal is not displayed in (C) for convenience, the timing is the same as that of the audio signal.

The case of recording from the frame 6 in FIG. 2D will be described below. In the present invention, the digital video signal is recorded from the timing of the beginning of the frame 6 as in the conventional case, but the digital audio signal is recorded in the frame 6
The recording is performed from the middle timing (see FIG. 2D).

First, at a timing two frames before the actual recording is started, the recorded digital audio signal (A6) is read from the pre-reading unit 4 under the control of the control unit 10, and this digital audio signal (A6) is obtained. It is stored in the voice data storage unit 6 (see FIG. 7C).

Next, at the timing one frame before the start of recording, the recorded digital video signal (V6) and digital audio signal (A6) are erased from the recording medium by the erasing section 5 (see FIG. 2C). ). In this case, the recorded digital video signal (V6) is completely erased,
The recorded digital audio signal (A6) is stored in the audio data recording unit 6.

Next, in the actual recording start frame, the digital input video signal V6 is recorded on the recording medium by the recording unit 2 from the timing of the start of the recording start frame (see (D) in the same figure).

On the other hand, regarding the digital audio signal, the control unit 10 switches the input switch 8 to the audio data storage unit 6 side from the timing of the start of the recording start frame, and the digital audio signal ( A6) is recorded on the recording medium. Then, the control unit 10 switches the input switch 8 to the digital input audio signal A6 side from an intermediate timing of the recording start frame to record the digital input audio signal A6 on the recording medium.

That is, in the recording of the digital audio signal in FIG. 3, first, the pre-reading unit 4 reads the recorded digital audio signal (A6) from the recording medium at the timing of two frames before the actual recording is started in S1. S2
Then, the read digital audio signal (A6) is stored in the audio data storage section 6. Next, in S3, the erasing unit 5 is executed at the timing one frame before the actual recording is started.
Erases the digital audio signal (A6) from the recording medium.

Next, in S4, the digital audio signal (A6) stored in the audio data storage unit 6 is recorded on the recording medium from the timing of the start of the recording start frame under the control of the control unit 10, and in S5, recording is performed. The control unit 10 checks whether or not the designated position in the frame (that is, the intermediate timing) has been reached. If the designated position in the frame has not been reached, S4 is continued and the designated position in the frame is reached. If so, the process proceeds to S6, and the digital input audio signal A6 is recorded on the recording medium from the designated position.

Thus, the digital input audio signal A6 is recorded on the recording medium from the middle of the frame 6, and the digital audio signal recorded from the beginning to the middle of the frame 6 is not lost.

Further, a switch 9 for turning on / off the output is provided on the output side of the reproducing section 3, and when the designated position in the frame is reached, the switch 9 is turned on to output a digital audio signal from the reproducing section 3. By outputting the output signal, and by controlling the control unit 10 not to output the digital audio signal from the reproduction unit 3 by turning off the switch 9 until the specified position in the frame is reached, the reproduction timing is also changed from the frame to the audio. The playback start / end position can be changed not only at the timing but also at any timing within the frame.

[0032]

According to the present invention, when the digital audio signal already recorded in the frame to be recorded is stored in the storage means in advance and the digital audio signal is recorded in the recording medium,
First, the digital voice signal stored in the storage means is recorded from the start timing of the frame, and then the digital input voice signal is recorded from the intermediate timing in the frame. The start timing can be designated and processed not only in the frame of the video signal but also in the frame.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a video / audio recording / reproducing apparatus according to the present invention.

FIG. 2 is a recording timing chart of the video / audio recording and reproducing apparatus.

FIG. 3 is a flowchart showing a procedure of audio recording of the video / audio recording / reproducing apparatus.

FIG. 4 is a configuration diagram of a conventional video / audio recording / reproducing apparatus.

FIG. 5 is a recording timing chart of the video / audio recording / reproducing apparatus.

FIG. 6 is a flowchart showing an audio recording procedure of the video / audio recording / reproducing apparatus.

[Explanation of symbols]

 1a, 1b A / D converter 2 recording unit 3 reproducing unit 4 pre-reading unit 5 erasing unit 6 audio data storage unit 8 input switching unit 10 control unit

Claims (3)

[Claims] 1. A video / audio recording / reproducing apparatus for recording and reproducing a digital audio signal on a recording medium in synchronism with a video signal, which is prior to the erasing process before recording the digital audio signal. Pre-reading means for reading the digital audio signal of the frame from the recording medium, storage means for storing the digital audio signal read by the pre-reading means, and digital audio signal read from the storage means or input from the outside Selecting means for selecting any one of the digital audio signals to be recorded, recording means for recording the digital audio signal selected by the selecting means on the recording medium, and the selecting means from the timing of the beginning of the recording start frame. Select the digital audio signal read from the storage means, and then select the intermediate audio signal in the frame. Video and audio recording and reproducing apparatus which comprises a control means for selecting a digital audio signal input from the external device from timing. 2. The digital audio signal input from the outside includes a signal obtained through an A / D converter for converting an analog audio signal into a digital audio signal. 1. A video / audio recording / reproducing apparatus according to 1. 3. The video / audio recording / reproducing apparatus according to claim 1, wherein the recording medium is a magnetic tape or a magneto-optical disk.