JPH0358591A - Video and sound recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the necessity of a circuit for correcting data errors caused by the defect of a medium and to reduce circuit scale by digitally recording an audio signal onto a semiconductor memory. CONSTITUTION:An electrically reloadable non-volatile semiconductor memory (EEPROM) 9 stores the digital audio signal attached to a video signal to be recorded onto a tape 1 and is provided attachably and detachably to a recording and reproducing device. As the EEPROM 9, a NAND type EEPROM suitable for enlarging capacity is especially preferable. Thus, since the audio signal attached to the video signal Is stoRed as the digital audio signal into the EEPROM 9, error correction is not needed and the circuit scale is reduced. Thus, cost can be lowered and the device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a recording and reproducing apparatus, and particularly to a video and audio recording and reproducing apparatus that records and reproduces a video signal and an audio signal accompanying the same.

(Prior Art) Devices for recording and reproducing video signals and accompanying audio signals using the same recording medium have been put into practical use as VTRs (video tape recorders), video disc devices, and the like. The former uses magnetic tape, and the latter uses optical or capacitive disks as recording media, and both use a converter (head) to convert between electrical signals, magnetic signals, and optical signals. Recording and reproduction are performed by the relative movement between the recording medium and the recording medium.

In recording and reproducing devices using such so-called dynamic recording media, audio signals are digitally recorded (PCM Note 8) in order to improve audio quality in line with the recent remarkable improvement in image quality.
It is desired to do so. In fact, digital recording of audio signals has already been put into practical use in some VTRs and video disc devices.

However, when recording audio signals digitally,
In order to avoid the effects of defects on the recording medium, an error correction circuit or an error correction circuit is required, which increases the circuit scale, increases costs, and impedes miniaturization. Furthermore, if the recording medium has significant defects, it becomes a national crisis to maintain high quality of reproduced audio.

(Problems to be Solved by the Invention) As described above, in a device that records and reproduces video signals and audio signals using the same recording medium, when audio signals are digitally recorded, the circuit size increases and defects in the medium occur. There is a problem in that when this becomes significant, the quality of the reproduced audio deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video/audio recording and reproducing apparatus that enables high-quality digital audio recording and reproducing using a small-scale circuit configuration.

[9. In the present invention, a video signal is recorded on a dynamic recording medium, and a digital audio signal accompanying the video signal is stored in an electrically rewritable semiconductor memory. . Further, an address signal indicating the storage position of the digital audio signal on the semiconductor memory is recorded on the recording medium in correspondence with the recording position of the video signal.

During reproduction, a video signal is reproduced from the recording medium, and an address signal is also reproduced from the recording medium, and digital audio signals are successively output from the semiconductor memory based on the reproduced address signal.

Here, the dynamic recording medium is a medium such as a magnetic tape or an optical disk that performs recording and reproduction through relative movement with a transducer. Taking the case of a magnetic tape as an example, the video signal is recorded on a first inclined track on the magnetic tape that is inclined with respect to the longitudinal direction, and the address signal indicating the storage position of the digital audio signal on the semiconductor memory is as follows. 1st on magnetic tape
The information is recorded on at least one of the second inclined track on the extension of the inclined track of , and the longitudinal track along the longitudinal direction of the magnetic tape.

(Function) By digitally recording audio signals on semiconductor memory, unlike when digitally recording on magnetic tape or disk, there is no need for a circuit to correct data errors caused by defects on the medium. Therefore, the circuit scale is reduced. Furthermore, since the audio signal is not affected by defects in the medium, high-quality reproduced audio can always be obtained.

Furthermore, since the audio signal is read out from the semiconductor memory and played back according to the address signal recorded in association with the video signal on the medium on which the video signal is recorded, the temporal correspondence between the video signal and the audio signal is kept correctly.

(husband example) Hereinafter, length embodiments of the present invention will be described with reference to the drawings.

FIG.
1 is a block diagram showing the configuration of the device, and FIG. 2 is a diagram showing the recording pattern on the magnetic tape in this device.

The video-audio recording green re-seat device shown in FIG. It is composed of a semiconductor memory (hereinafter referred to as EEFROM) 9, a write address generation circuit 11, a multiplexer 12, an address recording circuit 14, a switch 15, a video reproduction circuit 16, an address reproduction circuit 18, and a D/A converter 19. .

The rotary head 2.3 is a magnetic head provided on a rotary drum (not shown), and the first rotary head 2 has an inclined track inclined with respect to the longitudinal direction on the magnetic tape 1, as shown in FIG. 21 and 22 to record video signals and address signals as described later, and the second rotary head 3 reproduces the video signals and address signals recorded on the video and address inclined tracks 22. used for

The EEPROM 9 is for storing digital audio signals accompanying the video signals recorded on the tape 1, and is provided so as to be detachable from the recording/reproducing apparatus. Also,
If the tape 1 is made into a cassette like in a conventional VTR, the EEPROM 9 is integrally attached to the tape cassette, and as the tape cassette is attached or removed, the EEPROM
The PROM 9 and the recording/reproducing device may be connected and separated in a similar manner. Also, EEFROM9
A NAND type EEFROM, which is suitable for increasing capacity, is particularly preferable.

Next, the operation of this embodiment will be explained.

First, when recording video and audio signals, the video signal to be recorded is manually inputted from the terminal 4 to the video recording circuit 5.

The video recording circuit 5 is a circuit that processes the input video signal and outputs a video recording signal suitable for recording on the tape 1, and is composed of, for example, a pre-emphasis circuit, an FM modulator, a recording amplifier, etc. . This video recording signal is recorded on the video inclined track (first inclined track) 21 on the tape 1 via the switch 6 and the rotary head 2.

On the other hand, the audio signal that accompanies the video signal input to the terminal 4, that is, the audio signal that temporally corresponds to the video signal, is input to the A/D converter 8 from the terminal 7, and is quantized at an appropriate sampling frequency and quantized. The number of bits is converted into a digital audio signal.

This digital voice signal is written into EEPROM9. At this time, the address signal indicating the storage position of each data of the digital audio signal on the EEPROM 9 is sent to the terminal 10.
The write address generation circuit 11 is configured to be resettable to a desired state by a control signal input manually, and the EEPROM is generated via a multiplexer 12.
It is given to M9 as a write address signal. The multiplexer 12 is switched to selectively supply the address signal from the write address generation circuit 11 and the address signal from the address reproduction circuit 18 to the EEFROM 9 by an address switching signal inputted from a terminal 13.

The address signal generated by the write address generation circuit 11 is also input to the address recording circuit 14 to become a signal suitable for recording on the tape 1, and is sent to the switch 6 and the rotary head 2.
The data is recorded on the address inclined track 22 on the tape 1 via the .

The addressing inclined track 22 is formed on an extension of the video inclined track 21, as shown in FIG.

Here, the address signal recorded on the address inclined track 22 is an EEPROM Q in which a digital audio signal temporally corresponding to the video signal recorded on the video inclined track 21 on the same straight line is written. The upper storage location is shown. That is, the address signal indicating the writing position of the digital audio signal on the EEPROMQ is recorded on the tape 1 in association with the video signal.

Next, during playback, a video signal is detected from the video tilt track 21 by the rotary head 3, and the switch 15
It is manually inputted to the video reproduction circuit 16 via. The video reproducing circuit 16 is a circuit that performs the opposite process to that of the video recording circuit 5, and is composed of, for example, a re-amplifier, an FM demodulator, a de-emphasis circuit, and the like. The video signal reproduced by this video reproduction circuit 16 is outputted from a terminal 17 and supplied to, for example, a display device.

When a video signal is detected and reproduced from the video tilt track 21, for example, prior to this, an address is detected from the address tilt track 22 which is on the same straight line as the video tilt track 21 where the video signal is reproduced. The signal is detected by the rotary head 3 and inputted via the switch 15 to the address regeneration circuit 18 . The address is 18,
A read address signal on EEPROMQ is reproduced from the detected address signal.

This read address signal is applied to the EEFROM 9 via the multiplexer 12.

The digital audio signal data written in the address designated by the read address signal is read from the EEPROM 9. This digital audio signal is converted into an analog signal by the D/A converter 19 to form the original audio signal, and then outputted from the terminal 20 and supplied to, for example, an audio monitor.

In this case, the read address signal is detected when the corresponding video signal is detected from the video tilt track 21 and the video playback circuit 16
The address reproducing circuit 18 based on the address signal detected from the address slope track 22 before being reproduced by the
is generated. Therefore, it is possible to reproduce the audio signal without being delayed in time from the corresponding video signal.

Note that accurate timing alignment between the reproduced video signal and audio signal may be performed by adjusting the read timing from the EEFROM 9, or by adjusting the read timing from the EEPROM 9.
and the D/A converter 19.

As described above, the audio signal accompanying the video signal is
Since it is stored in the PROM 9 as a digital audio signal, problems such as those encountered when recording audio signals on magnetic tape are solved.

In other words, in conventional technology, audio signals are recorded on dynamic recording media such as magnetic tape or optical disks, so analog recording methods such as direct recording on longitudinal tracks or FM recording on inclined tracks suffer from quality issues. is not necessarily sufficient.

Additionally, in the PCM recording method, which converts audio signals into digital signals and records them on a dynamic recording medium, an error correction circuit or an error correction circuit is essential to compensate for data errors or omissions due to defects on the medium. , the circuit scale is increasing.

On the other hand, if EEFROM is used to record digital audio signals as in the present invention, it is not only advantageous in terms of quality, but also eliminates the need for error correction and correction, which reduces the size of the circuit and reduces costs. It is possible to achieve miniaturization.

In the above embodiment, the address signal indicating the writing position of the digital audio signal data on the EEPROM is recorded on the inclined track on the tape, but it is also possible to record it on the track along the longitudinal direction (longitudinal track) on the tape. Alternatively, the information may be recorded separately on the inclined track and the longitudinal track. Further, the address signal may be recorded on the video inclined track by a frequency multiplexing method, a deep recording method, or a time division multiplexing method (for example, (1) use of blanking, (2) multiplexing with a digital video signal, etc.).

In addition, this specification can be modified and implemented in various ways without departing from the gist.

[Effects of the Invention] According to the present invention, it is possible to record and reproduce an audio signal accompanying a video signal in the form of a digital signal with extremely high quality using a small-scale circuit configuration, and moreover, it is possible to record and reproduce an audio signal accompanying a video signal with extremely high quality. It is possible to maintain it correctly.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a video/audio recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing a recording pattern on a tape in the same embodiment. 1... Magnetic tape, 2.3... Quadruple head, 5...
・Video recording circuit, 8...A/D converter, 9...EE
PROM (electrically rewritable non-volatile semiconductor memory), 11... write address generation circuit, 14... address recording circuit, 16... video playback circuit, 18...
Address regeneration circuit, 1...D/A exchanger, 21...
- First inclined track, 22... second inclined track.

Claims (2)

[Claims] (1) A video recording means for recording a video signal on a dynamic recording medium; an audio recording means for storing a digital audio signal accompanying the video signal in an electrically rewritable nonvolatile semiconductor memory; and the semiconductor memory. address recording means for recording an address signal indicating the storage position of the above digital audio signal on the recording medium in association with the recording position of the video signal; video reproduction means for reproducing the video signal from the recording medium; The present invention is characterized by comprising: address reproducing means for reproducing the address signal from a recording medium; and audio reproducing means for reading and reproducing the digital audio signal from the semiconductor memory using the address signal reproduced by the address reproducing means. A video and audio recording and reproducing device. (2) a video recording means for recording a video signal on a first inclined track inclined with respect to the longitudinal direction of the magnetic tape; and storing a digital audio signal accompanying the video signal in an electrically rewritable semiconductor memory. an address signal indicating a storage position of a digital audio signal on the semiconductor memory, and a second inclined track on an extension line of the first inclined track on the magnetic tape, and a second inclined track on the magnetic tape in the longitudinal direction. address recording means for recording the video signal in correspondence with the recording position of the video signal on at least one of the longitudinal tracks along the track; video playback means for reproducing the video signal from the magnetic tape; and video playback means for reproducing the address signal from the magnetic tape. A video/audio recording and reproducing apparatus comprising: address reproducing means; and audio reproducing means for reading and reproducing the digital audio signal from the semiconductor memory using the address signal reproduced by the address reproducing means.