JPH0771248B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording and reproducing a video signal and an audio signal on a magnetic tape by a rotary magnetic head, and more particularly, on a magnetic tape by a rotary magnetic head. A magnetic recording / reproducing apparatus in which a tilted recording track formed in the recording medium is divided and a multiplexed signal of a video signal and an audio signal is recorded in one recording area and still image data is recorded in the other recording area. It is about.

[Outline of Invention]

The present invention relates to a magnetic recording / reproducing apparatus for recording and reproducing a video signal and an audio signal on a magnetic tape by a rotary magnetic head, and dividing a tilted recording track formed on the magnetic tape by the rotary magnetic head into one recording area. In addition to recording a multiplexed signal of a video signal and an audio signal, and recording still image data in the other recording area, recording and reproduction of a still image with good image quality can be performed.

[Conventional technology]

Conventionally, a so-called helical scan type video tape recorder (VTR) is generally used, which records and reproduces a video signal by tracing an inclined recording track on a magnetic tape by a rotary magnetic head. There is. For example, a so-called 8 mm video tape recorder is used which records a video signal in one recording area into which a tilted recording track formed on a magnetic tape is divided by a rotary magnetic head and records a PCM signal in the other recording area ( VTR) has been known for some time.

When recording and reproducing a still image with a video tape recorder, the magnetic tape is stopped and a specific track is repeatedly traced by a rotary magnetic head to perform still reproduction or to move a stationary object. I was shooting, recording and playing.

[Problems to be solved by the invention]

By the way, if a still image is obtained by still playback as described above, the running of the magnetic tape is stopped, so that the audio signal cannot be played back. There is a problem that only a still image can be obtained by playing and a moving image cannot be enjoyed.

Therefore, in view of the above-mentioned conventional problems, it is an object of the present invention to provide a magnetic recording / reproducing apparatus having a novel structure capable of simultaneously reproducing a moving image or a still image in combination with sound. .

[Means for solving problems]

In order to achieve the above-mentioned object, a magnetic recording / reproducing apparatus according to the present invention includes a multiplexing processing unit that multiplexes a video signal and an audio signal, and a still image processing unit that digitizes the video signal to form still image data. And a switching means for selectively supplying the multiplexed signal obtained by the multiplexing processing unit and the still image data obtained by the still image processing unit to the rotary magnetic head, and the rotary magnetic head, A recording system that divides the inclined recording track on the magnetic tape to record a video signal and an audio signal in one recording area and records still image data in the other recording area, and an inclined recording track on the magnetic tape. A reproduction signal obtained by tracing the magnetic field with a rotary magnetic head is reproduced from one recording area of the inclined recording track and a reproduction signal from the other recording area. A switching means for separating, a reproduction signal processing section for reproducing a video signal and an audio signal from a reproduction signal of one recording area of the inclined recording track supplied through the switching means, and a switching signal supplied through the switching means. A still image reproduction processing section for reproducing still image data from the reproduction signal of the other recording area of the tilted recording track to be analogized, a video signal reproduced by the reproduction signal processing section and the still image reproduction processing section. Video output switching means for selectively outputting the reproduced still image signal, a delay circuit to which the audio signal reproduced by the reproduced signal processing section is supplied, an audio signal reproduced by the reproduced signal processing section, and the above And an audio output switching means for selectively outputting the audio signal delayed by the delay circuit. Outputting video signal and audio signal reproduced by the reproduction signal processing section,
The still image reproduction mode includes a reproduction system that outputs a still image signal reproduced by the still image reproduction processing unit and an audio signal delayed by the delay circuit. The still image processing unit of the recording system and the reproduction system The present invention is characterized in that the time delay between the still image reproduction processing section and the audio signal is adjusted by compensating for the time delay by the delay circuit.

[Action]

In the magnetic recording / reproducing apparatus according to the present invention, in the recording system,
A rotary magnetic head divides an inclined recording track on a magnetic tape to record a video signal and an audio signal in one recording area and also records still image data in the other recording area. A reproduction signal obtained by tracing the upper tilted recording track with a rotary magnetic head is separated by a switching means into a reproduction signal from one recording area and a reproduction signal from the other recording area of the tilted recording track, and reproduction signal processing is performed. Section reproduces a video signal and an audio signal from a reproduction signal of one recording area of the inclined recording track, and a still image reproduction processing section reproduces still image data from a reproduction signal of the other recording area of the inclined recording track. By converting to analog, a still image signal and an audio signal are simultaneously recorded and reproduced. Moreover, the delay circuit compensates for the time delay due to the still image processing unit of the recording system and the still image reproduction processing unit of the reproducing system, and the still image signal and the audio signal are time-aligned to output a still image. And ensure correspondence with audio output.

〔Example〕

An embodiment of a magnetic recording / reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

The embodiment shown in FIG. 1 and FIG.
It is applied to TR.

In the block diagram of FIG. 1 showing the configuration of this embodiment,
The video signal is supplied from the first signal input terminal 1 to the video signal processing unit 2 and the analog / digital (A / D) converter 12. The video signal processing section 2 performs signal processing such as forming a low frequency conversion chroma signal and an FM luminance signal on the input video signal. Then, the video signal is supplied to the signal mixing circuit 5 of the recording system via the video signal processing section 2. The audio signal is supplied to the 8 mm AFM signal processing unit 4 from the terminal 3 as the second signal. The 8 mm AFM signal processing unit 4 performs signal processing on the input audio signal to form an FM audio signal having a carrier frequency between the carrier frequency of the low frequency conversion chroma signal and the carrier frequency of the FM luminance signal. The audio signal is supplied to the signal mixing circuit 5 via the AFM signal processing section 4.

The signal mixing circuit 5 mixes the video recording signal supplied from the video signal processing unit 2 and the audio recording signal supplied from the AFM signal processing unit 4, thereby frequency-converting the video recording signal and the audio recording signal. A multiplexed recording signal is formed. Then, this signal mixing circuit 5
The recording signal obtained in step 2 is supplied from the signal switching circuit 6 to the rotary magnetic head 8 via the head amplifier 7,
As shown in the figure, the rotary magnetic head 8 records on the video area (VA) of the inclined recording track TR on the magnetic tape 9.

Further, the A / D converter 12 has the first signal input terminal 1
The input video signal supplied from the device is digitized and the digital video data is supplied to the memory 13. The memory 13 is composed of two field memories 13A and 13B whose data writing / reading is controlled by the system controller 15. The digital video data is written to each of the field memories 13A and 13B for one field. It is supposed to be. Here, for writing data to the memory 13, for example, a write clock having a frequency of 3fsc or 4fsc (fsc = 3.5795 MHz in the case of NTSC method) is used. Then, to read data from the memory 13, a read clock of 4fh (fh = 15.734 KHz) is used.

Then, the video data read from the memory 13 is subjected to signal processing conforming to the PCM format of 8 mm VTR via the 8 mm PCM processing unit 14. The PCM data obtained by the 8 mm PCM processing unit 14 is supplied from the signal switching circuit 6 to the rotary magnetic head 8 through the head amplifier 7, and as shown in FIG. PC of the above inclined recording track TR on the magnetic tape 9
The data is recorded in the M area (P).

Here, the PCM area (P) of the inclined recording track TR
Is recorded for 1H for each track, and 1 for 263 tracks
Field PCM data, that is, digital video data is recorded. It should be noted that the above-mentioned 2 constituting the memory 13
For each of the field memories 13A and 13B, while the data is being read from one of the field memories, the data is written to the other field memory, and the data writing / reading is alternately performed. Digital video data written in memories 13A and 13B, that is, still image data, is recorded on the inclined recording track.
Data can be continuously recorded in the PCM area (P) of the TR. The timing of recording still image data in the PCM area (P) of the inclined recording track TR can be arbitrarily designated by the user of the VTR of this embodiment by operating the system controller 15. I am doing it.

In this way, the rotary magnetic head 8 records the multiplexed signal of the video signal and the audio signal in the video area (VA) of the tilted recording track TR, and the stationary of one arbitrary field of the moving image by the video signal. From the magnetic tape 9 in which the image data is recorded in the PCM area (P) of the inclined recording track TR, a video signal and an audio signal are recorded from the multiplexed signal recorded in the video area (VA) as follows. And separate and play back the above PCM
A still image can be reproduced from the still image data recorded in the area (P).

That is, in contrast to the above-described recording system, the reproducing system in this embodiment is such that the reproduction output signal obtained by the rotary magnetic head 8 by tracing the inclined recording track TR on the magnetic tape 9 is the head amplifier 7. From the signal switching circuit 6 to the video signal processing unit 2 and the 8 mm PCM processing unit 14 and from the signal switching circuit 6 to the 8 mm AFM signal processing unit 4 via the band pass filter (BPF) 21. It has become.

Then, the video signal processing unit 2 performs video signal reproduction processing on the multiplexed signal reproduced from the video area (VA) of the inclined recording track on the magnetic tape 9, and the band pass filter (BPF). ) 21 by FM
The audio signal is separated, and the 8 mm AFM signal processing section 4 performs the reproduction processing of the audio signal. The reproduced video signal obtained by the video signal processing unit 2 is supplied to the monitor receiver 31 via the switch circuit 31. In addition, the above
The reproduced audio signal obtained by the 8 mm AFM signal processing unit 4 is output to the output amplifier via the delay circuit 22 or the switch 23.
24 to the speaker 25 from the output amplifier 24. Since a reproduced still image signal, which will be described later, causes a time delay due to PCM processing in the recording system and the reproducing system,
The delay circuit 22 adjusts the time between the reproduced audio signal and the reproduced still image signal.

In addition, the PC of the inclined recording track on the magnetic tape 9
Regarding the still image data reproduced from the M area (P),
Reproduction processing is performed by the 8 mm PCM processing unit 14. The reproduced still image data obtained by the 8 mm PCM processing unit 14 is written in the memory 13 and sequentially read out from the respective field memories 13A and 13B one by one to obtain digital / analog (D / D).
A) It is converted into an analog signal by the converter 30 and is reproduced as a still image signal through the switch circuit 31 and the monitor receiver 31.
Is supplied to.

Therefore, in this embodiment, the switch circuit 31 switches between the reproduced video signal output from the video signal processing unit 2 and the reproduced still image signal output from the D / A converter 30, It is possible to reproduce the image and the sound by selecting the combination of the sound of the reproduced audio signal and the moving image of the reproduced video signal or the combination of the sound of the reproduced audio signal and the still image of the reproduced still image signal. . Moreover, since the still image based on the reproduced still image signal is obtained by digitally recording still image data in the recording system, an extremely high resolution can be obtained, and the image quality is less deteriorated by the tabbing.

Although the present invention is applied to a so-called 8 mm VTR in the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment,
It can be generally applied to a helical scan type VTR in which an inclined recording track on a magnetic tape is traced by a rotating magnetic head.

〔The invention's effect〕

As is apparent from the above description of the embodiments, in the magnetic recording / reproducing apparatus according to the present invention, the video signal and the audio signal are multiplexed in one recording area obtained by dividing the inclined recording track on the magnetic tape traced by the rotary magnetic head. The recorded signal is recorded and still image data is recorded in the other recording area. Therefore, at the time of reproduction, the audio signal and the video signal are separated from the multiplexed signal and reproduced, so that the moving image and the sound are simultaneously reproduced, Further, it is possible to reproduce a still image from the still image data while reproducing the audio signal. Moreover, by compensating the time delay between the still image processing unit of the recording system and the still image reproduction processing unit of the reproducing system with the delay circuit, the still image signal and the audio output can be output by adjusting the time between the still image signal and the audio signal. It is possible to secure correspondence with. Furthermore, since the still image is digitally recorded as still image data, an extremely high resolution can be obtained, and the image quality is less deteriorated by dubbing.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to an 8 mm VTR, and FIG. 2 is a schematic diagram showing a recording track pattern on a magnetic tape in the above embodiment. 1 …… Video signal input terminal 2 …… Video signal processing section 3 …… Audio signal input terminal 4 …… 8mm AFM signal processing section 5 …… Signal mixing circuit 8 …… Rotating magnetic head, 9 …… Magnetic tape 12 …… A / D converter, 13 …… Memory 14 …… 8mm PCM signal processing unit 30 …… D / A converter

Claims (1)

[Claims] 1. A multiplexing processing unit for multiplexing a video signal and an audio signal, a still image processing unit for digitizing a video signal to form still image data, and a multiplexed signal obtained by the multiplexing processing unit. And a switching means for selectively supplying the still image data obtained by the still image processing section to the rotating magnetic head, and the inclined recording track on the magnetic tape is divided by the rotating magnetic head. The recording system that records video and audio signals in the recording area and the still image data in the other recording area, and the reproduction signal obtained by tracing the inclined recording track on the magnetic tape with the rotating magnetic head. Switching means for separating a reproduction signal from one recording area of the inclined recording track and a reproduction signal from the other recording area, and the switching means are supplied through the switching means. From a reproduction signal processing section for reproducing a video signal and an audio signal from a reproduction signal of one recording area of the inclined recording track, and from a reproduction signal of the other recording area of the inclined recording track supplied via the switching means. Still image reproduction processing unit for reproducing still image data and converting it to analog, and video output for selectively outputting the video signal reproduced by the reproduction signal processing unit and the still image signal reproduced by the still image reproduction processing unit. Switching means, a delay circuit to which the audio signal reproduced by the reproduction signal processing unit is supplied, an audio signal reproduced by the reproduction signal processing unit and an audio signal delayed by the delay circuit are selectively output. In the normal reproduction mode, the audio output switching means for switching between the video signal reproduced by the reproduction signal processing section and the audio signal is reproduced. In the still image reproduction mode, the still image reproduction processing section outputs a still image signal reproduced by the still image reproduction processing section and an audio signal delayed by the delay circuit. Compensating the time delay due to the processing unit and the still image reproduction processing unit of the reproduction system by the delay circuit,
A magnetic recording / reproducing apparatus characterized in that a still image signal and an audio signal are time-aligned.