JP2877981B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus such as a digital audio tape recorder (DAT) having a function of changing a part of information once recorded and re-recording the information. .

[0002]

2. Description of the Related Art As one conventional recording / reproducing apparatus, an audio signal is converted into a digital signal and recorded on a magnetic tape, and a digital signal recorded on a magnetic tape is converted into an audio signal and reproduced. DATs are well known.

In the case of this DAT, when an audio signal is converted into a digital signal and recorded on a magnetic tape, information for error correction such as parity can be recorded at the same time. Can be repaired even if it occurs, so that not only the original sound can be faithfully reproduced, but also a sound with very little noise can be reproduced.

Some of the above-mentioned conventional DATs include two-channel mode in which two channels for individually recording two types of audio signals are set on a magnetic tape, and four types of audio signals. Record 4 individually
In some cases, a 4-channel mode in which a channel is set to a magnetic tape can be selected.

[0005] In the two-channel mode, two types of audio signals corresponding to the two speakers arranged on the front left side and the front right side of the listener are recorded on the magnetic tape. 4 arranged on the front left side, front right side, rear left side and rear right side
Four types of audio signals corresponding to one speaker are recorded.

In the four-channel mode, an audio signal is recorded on two of the channels, and a still picture signal is recorded on the remaining two channels, and the audio signal and the video signal are recorded from one magnetic tape. Conventionally, a system in which reproduction is performed simultaneously is also known.

In this method, a recording area for four channels is set on the magnetic tape, and a still picture signal is recorded on two channels and an audio signal is recorded on the remaining two channels simultaneously.

However, in such a method of simultaneously recording a video signal and an audio signal, an after record (hereinafter, referred to as "recording") in which only a part of the video signal is re-recorded or only a part of the audio signal is re-recorded, for example. After-recording).

Therefore, as an alternative, a recording area for two channels is set on the magnetic tape, and a still picture video signal for one screen and a corresponding audio signal such as narration are recorded on the magnetic tape. There has been proposed a DAT capable of after-recording, in which a still image video signal and an audio signal are recorded and reproduced in pairs at the time of reproduction before and after a section.

FIG. 4 is a block diagram schematically showing a configuration of a DAT of the system. In this DAT, for example, two memories 24 and 25 for storing a still image video signal for one screen are prepared. During recording, input terminal TVI
Is converted into a digital signal by an analog-to-digital conversion (hereinafter, referred to as A / D conversion) circuit 28, and the digital video signal for one screen is transferred to a data bus before being recorded on the magnetic tape 32. 27, the data is temporarily written to one of the two memories 24 and 25 sequentially over a certain time (hereinafter, referred to as a first time).

Next, the video signal is read from the memory over a certain time (hereinafter, referred to as a second time) which is sufficiently longer than the first time, and the recording signal processing circuit 23 performs modulation and error processing through the data bus 27. After undergoing processing such as addition of a correction code, the data is recorded on a magnetic tape 32 by a magnetic head (not shown) of the rotating drum 21 via a head amplifier circuit 22.

At this time, in parallel with the video signal, the input terminal T
The audio signal input to the AI is converted into a digital signal by an A / D conversion circuit 29, and the digital audio signal is once used for writing a video signal via a data bus 27 before being recorded on a magnetic tape 32. The remaining memory is sequentially written into the remaining memory over a second time, and after completion of the writing, is read from the memory over the same second time as the video signal, and is processed via the data bus 27 for recording signal processing. After undergoing processing such as modulation and addition of an error correction code in the circuit 23, the data is recorded on the magnetic tape 32 by the magnetic head of the rotating drum 21 via the head amplifier circuit 22.

As a result, the still picture video signal for one screen and the corresponding audio signal such as narration are paired and recorded in one section on the magnetic tape 32. That is, a still image video signal is recorded in the first half recording area of the one section, and an audio signal is recorded in the second half recording area.

On the other hand, at the time of reproduction, a video signal for one screen read from the magnetic tape 32 by the magnetic head of the rotating drum 21 is amplified by the head amplifier circuit 22 and subjected to processing such as demodulation and error correction by the reproduction signal processing circuit 26. After receiving the data, the data is temporarily written to one of the memories over a second time via the data bus 27, and after the writing is completed, the image for one screen is taken from the memory for the first time. The signal is read out, converted to an analog signal by a digital-analog conversion (hereinafter, referred to as D / A conversion) circuit 30 via a data bus 27, and led to an output terminal TVO.

At this time, following the video signal, the magnetic tape 3
The audio signal read from 2 is amplified by the head amplifier circuit 22 and subjected to processing such as demodulation and error correction by the reproduction signal processing circuit 26, and is converted to an analog signal by the D / A conversion circuit 31 over a second time. It is led to the output terminal TAO.

As a result, the still picture video signal for one screen and the corresponding audio signal are reproduced simultaneously.

[0017]

However, in the above-mentioned conventional DAT, if it is intended to provide a copying function for recording a recorded video signal or audio signal in another recording area of the magnetic tape 32, an audio signal may be generated. There is a problem that signals cannot be easily copied.

That is, when copying a recorded video signal to another video signal recording area, the video signal read from the magnetic tape 32 by the reproducing operation is transmitted from the reproduced signal processing circuit 26 to the data bus 27 via the data bus 27. Once in memory 2
4, 25, and then read a video signal from the memory by a recording operation, and record a desired video signal on the magnetic tape 32 via the data bus 27, the recording signal processing circuit 23, the head amplifier circuit 22, and the rotating drum 21. Although the audio signal can be recorded in the area, the audio signal is not once written in the memories 24 and 25 in the reproducing operation, so that the reproduced audio signal cannot be directly recorded in the desired audio signal recording area of the magnetic tape 32. .

Accordingly, an object of the present invention is to provide a recording / reproducing apparatus capable of easily copying a video signal and an audio signal recorded on a recording medium such as a magnetic tape to another recording area of the same recording medium. .

[0020]

According to the present invention, a video signal for one screen and an audio signal corresponding thereto are recorded before and after one section of a recording medium, and a video signal reproduced from the recording medium is recorded. In a recording / reproducing apparatus for storing a video signal and a corresponding audio signal as a pair by storing the video signal in a memory and reading the video signal from the memory when the corresponding audio signal is reproduced from the recording medium, A search means for searching for a head position of another section to be re-recorded on the recording medium at the time of copying;
When the video signal reproduced from the section is stored in the memory, the audio signal corresponding to the video signal is also stored in the memory, and thereafter, the video signal to be re-recorded on the recording medium detected by the search unit is stored. When the head position of another section is detected, the video signal is read from the memory and recorded on the recording medium, and after the recording of the video signal is completed, the audio signal is read from the memory and recorded continuously on the recording medium. A recording / reproducing apparatus comprising:

[0021]

According to the present invention, a video signal for one screen recorded before and after one section of a recording medium and a corresponding audio signal are recorded on another recording medium on another recording medium. In copying data to a section, a video signal and an audio signal are reproduced from the one section and stored in a memory sequentially and successively. Thereafter, when the search means searches and detects the head position of another section to be re-recorded on the recording medium, the video signal and the audio signal are read out from the memory in this order and recorded. In this way, by a single dubbing operation, the video signal and the audio signal recorded in one section of the recording medium are re-recorded in another arbitrary section on the same recording medium by one dubbing operation, and the data is copied. can do.

[0022]

FIG. 1 is a block diagram showing a schematic configuration of a recording / reproducing apparatus according to an embodiment of the present invention. This recording / reproducing apparatus sets a recording area for two channels on a magnetic tape 12, and transmits a still image video signal for one screen and a corresponding audio signal such as narration to one section of the magnetic tape. This DAT is a DAT of a system capable of after-recording, in which the still image video signal and the audio signal are reproduced in pairs at the time of reproduction. The recording / reproduction function is the conventional DAT shown in FIG. Is the same as

The input terminal TVi is a terminal for inputting a still image video signal, and the input terminal TAi is a terminal for inputting an audio signal such as narration corresponding to the still image video signal. These input terminals TVi,
TAi is connected to corresponding A / D conversion circuits 8 and 9, respectively.

The A / D conversion circuit 8 has a function of converting a video signal input from the input terminal TVi into a digital video signal, and the converted digital video signal is led out to the data bus 7.

The A / D conversion circuit 9 has an input terminal TA
i has a function of converting an audio signal input from i into a digital audio signal, and the converted digital audio signal is led to the data bus 7.

The data bus 7 has two memories 4, 5
Is connected. These memories 4 and 5 have a capacity enough to store data for one screen, that is, one field of the video signal output from the A / D conversion circuit 8. During the recording operation, one of the memories 4 and 5 contains A
The digital video signal for one screen output from the / D conversion circuit 8 is written over a first time. In this case, the writing time of the digital video signal for one screen, that is, the first time is 1 / the required time for inputting the video signal for one screen.
It is set to 60 seconds.

In another memory which is not used for storing the video signal, the digital audio signal output from the A / D conversion circuit 9 is stored in the second memory which is sufficiently longer than the first time.
Is written over time.

The recording signal processing circuit 3 is connected to the data bus 7 separately. The recording signal processing circuit 3 modulates digital video signals and digital audio signals read from the memories 4 and 5 and input via the data bus 7, and performs error correction and the like on the input digital signals. And has a sub-information addition function for adding sub-information. It takes a second time to read a video signal for one screen from one of the memories 4 and 5, and a second time when reading a corresponding audio signal from the other one of the memories 4 and 5. Takes time.

The head amplifier circuit 2 supplies a recording current to a magnetic head (not shown) of the rotary drum 1 at the next stage according to a signal output from the recording signal processing circuit 3,
A signal read from the magnetic tape 12 by the magnetic head of the rotating drum 1 is amplified to reproduce a reproduction signal processing circuit 6 described later.
With the function to give to.

The reproduction signal processing circuit 6 includes the magnetic tape 1
2 has a demodulating function of demodulating the signal read from the sub-information 2 and a processing function of performing processing such as error correction from the read sub-information, and its output terminal is connected to the data bus 7.

In the reproduction operation, the digital video signal output from the reproduction signal processing circuit 6 is written to one of the memories 4 and 5 via the data bus 7. At this time, it takes a second time to write the video signal for one screen to the memory.

Also, in the reproducing operation, in the case of merely reproducing the recorded signal on the magnetic tape 12, the audio signal output from the reproduced signal processing circuit 6 is transmitted through the data bus 7 to the D bus.
/ A conversion circuit 11.

On the other hand, in a reproduction operation for post-recording in which a signal recorded on the magnetic tape 12 is recorded in another recording area of the same magnetic tape 12, a digital audio signal output from the reproduction signal processing circuit 6 is used. Is the data bus 7 through which the video signal is not written in one of the memories 4 and 5.
Written in one. It takes a second time to reproduce the audio signal corresponding to the video signal for one screen.

The video signal for one screen written in one of the memories 4 and 5 is read out in a normal reproduction operation over a first time, and sent to the D / A conversion circuit 10 via the data bus 7. Given. On the other hand, in the case of the after-recording operation, the data is read out over a second time as in the case of the recording operation, and is applied to the recording signal processing circuit 3 via the data bus 7.

The D / A conversion circuit 10 has a function of converting an input digital video signal into an analog video signal and outputting the analog video signal to an output terminal TVo. D / A conversion circuit 1
1 has a function of converting an input digital audio signal into an analog audio signal and outputting the analog audio signal to an output terminal TAo.

FIG. 2 shows a magnetic tape 1 according to the DAT.
FIG. 3 is a conceptual diagram showing an operation when the signal recorded on the recording tape 2 is dubbed to another recording area of the same magnetic tape 12;
Is a flowchart showing the post-recording operation.

Next, the recording and reproducing operations of the DAT will be described.

The still image video signal input to the recording input terminal TVi is converted into a digital video signal by the A / D conversion circuit 8, and
The digital video signals for the screen are sequentially written to one of the two memories 4 and 5 sequentially via the data bus 7 over a first time.

Next, the digital video signal is read out of the memory over a second time which is sufficiently longer than the first time, and the recording signal processing circuit 3 transmits the digital video signal via the data bus 7 to perform modulation or addition of an error correction code. After the processing, the data is recorded on the magnetic tape 12 by the magnetic head (not shown) of the rotating drum 1 via the head amplifier circuit 2.

At this time, an audio signal such as a narration corresponding to the still image is input to the input terminal TAi in parallel with the still image video signal. The audio signal is converted into a digital audio signal by the A / D conversion circuit 9, and the digital audio signal also passes through the data bus 7 and temporarily takes a second time to the remaining memory not used for writing the video signal. After the writing is completed, the data is read from the memory for the same second time as the video signal.

The read digital audio signal passes through a data bus 7, undergoes processing such as modulation and addition of an error correction code in a recording signal processing circuit 3, passes through a head amplifier circuit 2, and then passes through a magnetic head of the rotating drum 1. Is recorded on the magnetic tape 12.

As a result, the magnetic tape 12 has the structure shown in FIG.
As shown in the figure, for example, a still image video signal V1 for one screen
And a corresponding audio signal A1 such as a narration are recorded as a pair in one section R1. That is, the still image video signal V1 is recorded in the first half recording area of the one section R1, and the audio signal A1 is recorded in the second half recording area.

The playback Meanwhile, at the time of reproduction, the digital video signal for one screen from the magnetic tape 12 is read by the rotary drum 1 of the magnetic head is amplified by the head amplifier 2 reproduction signal processing circuit 6 by a demodulation and error correction, etc. , And once over the data bus 7 for a second time,
Are written sequentially. After the writing is completed, a digital video signal for one screen is read from the memory over a first time. The read digital video signal is converted into an analog video signal by a D / A conversion circuit 10 via a data bus 7 and is led to an output terminal TVo.

At this time, the digital audio signal read from the magnetic tape 12 subsequent to the digital video signal is amplified by the head amplifier circuit 2, subjected to processing such as demodulation and error correction by the reproduction signal processing circuit 6, and passed through the data bus 7. Over a second time, the signal is converted into an analog signal by the D / A conversion circuit 31, and is output to the output terminal TAo.

As a result, a still picture video signal for one screen and an audio signal corresponding to the still picture video signal are simultaneously reproduced, and the display of a still picture that changes every predetermined time is displayed on a display device such as a CRT (cathode ray tube). And a voice such as a narration corresponding to each still image is reproduced by a speaker.

Next, with reference to FIGS. 2 and 3, the first still picture video signal V1 recorded in the recording area of the section R1 of the magnetic tape 12 and the first audio signal A corresponding thereto.
1 is the same magnetic tape 1 on which the second still picture video signal V2 and the corresponding second audio signal A2 are recorded.
A post-recording operation when re-recording in the recording area of another section R2 (hereinafter, a copying operation when no signal is recorded in the section R2) will be described.

First, after the start of the after-recording operation in step s1, in step s2, the head position of the section R1 on the magnetic tape 12 is searched. This search is
This is performed by detecting sub-information recorded in the sub-code recording area of the magnetic tape 12 in a normal recording operation in association with each section.

When the head position of the target section R1 is detected, the first still picture video signal V1 for one screen recorded in the first half of the section R1 is read out by the reproducing operation in the next step s3. And read out video signal V1
Is written to one of the memories 4 and 5 in step s4.

Next, in step s5, the section R1
Is read out by the reproducing operation, and the read out audio signal A1 is written to the other one of the memories 4 and 5 in step s6.

Next, the head position of another section R2 on the magnetic tape 12 on which the signal reproduced as described above is to be re-recorded is searched in step s7.

When the head position of the target section R2 is detected, at step s8, one of the memories 4 and 5 is set to 1
The video signal V1 for the screen is read, and the video signal V1 is re-recorded on the recording area of the second video signal V2 in the first half of the section R2 by the recording operation in step s9.

Then, in step s10, the audio signal A1 is read from the other one of the memories 4 and 5, and the audio signal A1 is recorded in step s11 by the recording operation in the recording area of the second audio signal A2 in the latter half of the section R2. Will be re-recorded.

Next, in step s12, it is determined whether or not the post-recording operation should be terminated. If it is determined that the post-recording operation should be continued, the process returns to step s2, and the post-recording of another recording signal is similarly repeated. If it is determined in step s12 that the post-recording operation is to be ended, the process proceeds to step s13, where all post-recording operations are completed.

[0054]

As described above, according to the recording / reproducing apparatus of the present invention, the video signal and the audio signal recorded in one section of the recording medium can be converted by one dubbing operation by a single recording / reproducing apparatus. It becomes possible to copy the data by re-recording it in any other section on the same recording medium. Therefore, the operability is excellent, and data duplication is realized by one dubbing operation as described above, so that data deterioration such as increase in noise does not occur. Further, since data can be copied by a single recording / reproducing device, a plurality of recording / reproducing devices are not required, the configuration can be downsized, and the cost is excellent.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating an after-recording operation by the recording / reproducing apparatus of the embodiment.

FIG. 3 is a flowchart illustrating an after-recording operation performed by the recording / reproducing apparatus of the embodiment.

FIG. 4 is a block diagram showing a schematic configuration of a conventional recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary drum 2 Head amplifier circuit 3 Recording signal processing circuit 4, 5 Memory 6 Reproduction signal processing circuit 7 Data bus 8, 9 A / D conversion circuit 10, 11 D / A conversion circuit 12 Magnetic tape

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 27/00 G11B 20/10

Claims (1)

(57) [Claims] 1. A video signal for one screen and an audio signal corresponding thereto are recorded on one section of a recording medium before and after, while
The video signal reproduced from the recording medium is stored in a memory, and the video signal and the corresponding audio signal are paired by reading the video signal from the memory when the corresponding audio signal is reproduced from the recording medium. Means for searching for a head position of another section to be re-recorded on a recording medium at the time of data copying, and a video signal reproduced from said one section of said recording medium at the time of data copying. Is stored in the memory, a corresponding audio signal is also stored in the memory, and thereafter,
When a head position of the another section to be re-recorded on the recording medium detected by the search means is detected, a video signal is read from the memory and recorded on the recording medium, and after the recording of the video signal is completed, Control means for reading out the audio signal from the memory and continuously recording the audio signal on the recording medium.