JPH0591456A - Recording / playback device - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a video recording device capable of detecting whether or not a storage medium for an audio signal accompanying a video signal is attached to the device. A means for recording image information on a recording medium, a storage address generating means for storing voice information accompanying the image information in a semiconductor memory, and the voice information in the semiconductor memory based on the storage address. Image information, comprising: a storage unit that stores the address, an address recording unit that records the storage address in association with a recording position of the image information, and a unit that detects a mounting state of the semiconductor memory.
A recording / reproducing apparatus characterized by recording and reproducing audio information.

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 for recording / reproducing a video signal and an audio signal accompanying it.

[0002]

2. Description of the Related Art A device for recording and reproducing a video signal and an audio signal accompanying it using the same recording medium has been put to practical use as a VTR (video tape recorder), a video disk device and the like. The former uses a magnetic tape as a recording medium, and the latter uses a disk of an optical system or an electrostatic capacity system as a recording medium. In both cases, recording and reproduction are performed by relative movement between a recording medium and a converter (head) for converting between an electric signal and a magnetic signal or an optical signal. In a recording / reproducing apparatus using such a so-called dynamic recording medium, it is desired to digitally record (PCM record) an audio signal in order to improve the quality of sound quality in response to the remarkable image quality improvement in recent years. Actually, digital recording of audio has been put into practical use in some models of VTRs and video disc devices.

However, in the case of digitally recording an audio signal, in order to avoid the influence of defects on the recording medium,
Since the error correction circuit and the error correction circuit are required, the circuit scale increases, the cost increases, and the miniaturization is hindered.
Further, if the recording medium has a significant defect, it becomes difficult to maintain the quality of reproduced sound high.

In order to solve the above problems, the applicant of the present application has proposed the following device in Japanese Patent Application No. 1-192692. That is, the video signal is recorded on the dynamic recording medium, and the digital audio signal accompanying the video signal is stored in the semiconductor memory device. A storage address 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. At the time of reproduction, the address signal is reproduced from the recording medium, the digital audio signal is read from the semiconductor memory by the address signal, and the original digital audio signal is obtained.

In the above apparatus, since the video signal and the audio signal are recorded or stored in different media, the semiconductor memory has a magnetic tape in which a magnetic tape as a recording medium is incorporated in order to facilitate the handling of these media. It is desirable to be integrated with a tape cassette or the like. However, depending on this integration method, there is a risk that the recording of the program may be performed due to careless handling, without the semiconductor memory being attached to the recording / reproducing apparatus. In this case, the video signal is recorded in the dynamic recording medium, but the audio signal is lost without being stored, which may cause failure in saving the program.

[0006]

As described above, in the recording / reproducing apparatus of the present application, the video signal and the audio signal are recorded or stored in different recording media or storage media, so careless handling is required. There was a risk that the program would be recorded without the semiconductor memory attached. As a result, the audio signal may be lost, and the program may fail to be saved. It is an object of the present invention to provide a recording / reproducing apparatus that enables reliable recording of an audio signal accompanying a video signal.

[0007]

In the present invention, means for recording image information on a recording medium, storage address generating means for storing voice information accompanying the image information in a semiconductor memory, and the voice information Storage means for storing the storage address in the semiconductor memory based on the storage address, address recording means for recording the storage address in the recording medium in association with the image information, and means for detecting a mounting state of the semiconductor memory. And recording and reproducing image information and audio information.

[0008]

In the present invention, the recording means for recording the video signal on the recording medium, the storage means for storing the audio signal in the semiconductor memory, and the detecting means for detecting whether or not the semiconductor memory is mounted in the apparatus are provided. Each of them is provided, and it is possible to surely detect whether or not the semiconductor memory is attached to the device at the time of recording the program. As a result, the operator does not have to worry about recording a program when the semiconductor memory is not mounted in the apparatus. Therefore, the audio signal accompanying the video signal will not be lost, and the program can be surely recorded.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the first information is a video signal, the second information accompanying the first information is an audio signal, and the dynamic recording medium is a magnetic tape.

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing a recording pattern on a magnetic tape in this apparatus, and FIG. 3 is a circuit diagram of a semiconductor memory detecting circuit. Is.

The recording / reproducing apparatus shown in FIG.
The rotary heads 2 and 3, the video recording circuit 5, the switch 6, the A / D converter 8, the semiconductor memory 9, the memory address generation circuit 11, the multiplexer 12, the address recording circuit 14,
Switch 15, video reproduction circuit 16, address reproduction circuit 18, D
The A / A converter 19, the semiconductor memory storage device 23, and the semiconductor memory detection circuit 29 are included.

The rotary heads 2 and 3 are magnetic heads provided on a rotary drum (not shown), and the first rotary head 2 is inclined with respect to the longitudinal direction on the magnetic tape 1 as shown in FIG. The inclined tracks 21 and 22 are formed to record the video signal and the address signal as described later, and the second rotary head 3 is used for the video and address inclined tracks 21 and 22.
It is used to reproduce the video signal and the address signal recorded in the. The semiconductor memory 9 is for storing the digital audio signal accompanying the video signal recorded on the tape 1, and is provided so as to be attachable to and detachable from the recording / reproducing apparatus. That is, the semiconductor memory 9 is mounted in the semiconductor memory storage device 23,
23 is, for example, in the form of a card provided with contacts on its surface. The tape 1 is stored in a tape cassette like a conventional VTR, and the semiconductor memory storage device 23 is integrally attached to the tape cassette, and the semiconductor memory 9 and the recording / reproducing device are attached together with the tape cassette attaching / detaching operation. It is configured to be electrically connected / separated. Alternatively, the semiconductor memory 9 can be directly incorporated in the tape cassette. That is, it is possible to form a wiring pattern on the inner wall or the outer wall of the tape cassette and mount the semiconductor memory chip thereon. As the semiconductor memory 9, a NAND type EEPROM suitable for large capacity
M is particularly preferred. Next, the operation of this embodiment will be described.

First, at the time of recording the video and audio signals, the video signal to be recorded is input to the video recording circuit 5 from the terminal 4. The video recording circuit 5 is a circuit that processes an input video signal and outputs a video recording signal suitable for recording on the tape 1. For example, an A / D converter, an error correction coding circuit, a shuffling circuit, and an interleave circuit. And a memory circuit, a modulation circuit, a recording amplifier, etc. This video recording signal is recorded on the video tilt track (first tilt track) 21 on the tape 1 via the switch 6 and the rotary head 2.

On the other hand, the audio signal accompanying the video signal input to the terminal 4, that is, the audio signal temporally corresponding to the video signal is input to the A / D converter 8 from the terminal 7. A
In the / D converter 8, the audio signal is quantized after being sampled at an appropriate sampling frequency. This digital audio signal is a terminal on the semiconductor memory storage device 23.
It is written in the semiconductor memory 9 via 25. At this time,
The storage address indicating the storage position of each data of the digital audio signal on the semiconductor memory 9 is the storage address generation circuit 11
And is supplied to the semiconductor memory 9 as a storage address signal via the multiplexer 12 and the terminal 24 on the semiconductor memory storage device 23.

The multiplexer 12 uses the address switching signal input from the terminal 13 to generate a storage address generation circuit.
The address signal from 11 and the address signal from the address reproducing circuit 18 are switched so as to be selectively supplied to the semiconductor memory 9. The storage address generated by the storage address generation circuit 11 is also input to the address recording circuit 14 and becomes a signal suitable for recording on the tape 1, and the inclined track for address on the tape 1 is passed through the switch 6 and the rotary head 2. Recorded in 22. Inclined track for this address 22
Are formed on the extension line of the inclined video track 21 as shown in FIG. Here, the inclined track for address 22
The recording address recorded in is, for example, a storage position in the semiconductor memory 9 in which a digital audio signal temporally corresponding to the video signal recorded in the video inclination track 21 on the same straight line as this is written. There is. That is, the storage address indicating the storage position of the digital audio signal on the semiconductor memory 9 is recorded on the tape 1 in association with the video signal.

The storage address capacity recorded here can be made extremely small. For example, when considering a set of bits representing a digital audio signal temporally corresponding to one field of a video signal, only the address of the bit most temporally preceding can be recorded. For this,
It suffices if the address is regularly associated with each bit of the digital audio signal sequentially input from the A / D converter 8. As a result, the same storage address can be recorded a number of times on the address tilt track 22 and, as a result, the influence of an error due to a medium defect or the like can be eliminated.

Next, during reproduction, a video signal is detected from the video tilt track 21 by the rotary head 3 and input to the video reproduction circuit 16 via the switch 15. The video reproduction circuit 16 is a circuit for performing processing reverse to that of the video recording circuit 5, and is composed of, for example, a reproduction amplifier, a demodulation circuit, a memory circuit for deinterleaving and deshuffling, an error correction decoding circuit, a D / A converter and the like. To be done. The video signal reproduced by the video reproduction circuit 16 is output from the terminal 17 and supplied to, for example, a display device.

When a video signal is detected and played back from the video tilt track 21, almost simultaneously with this, an address signal is read from the address tilt track 22 which is on the same straight line as the video tilt track 21 from which the video signal is played. The address reproducing circuit 18 is detected by the rotary head 3 and via the switch 15.
Entered in. The address reproducing circuit 18 reproduces the read address signal on the semiconductor memory 9 from the detected address signal. This read address signal is given to the semiconductor memory 9 via the multiplexer 12 and the terminal 24 on the semiconductor memory housing device 23. From the semiconductor memory 9, the data of the digital audio signal written at the address designated by the read address signal is read. This digital audio signal is input to the D / A converter 19 via the terminal 26 on the semiconductor memory housing device 23. After being converted into an analog signal by the D / A converter 19 to be an original audio signal, it is output from the terminal 20 and supplied to, for example, an audio monitor.

The delay amount from video input to video output and the delay amount from audio input to audio output must be the same throughout the recording and reproducing processes. For this purpose, the video recording circuit 5, the address recording circuit 14, the video reproducing circuit 16 and the address reproducing circuit 18 may be provided with appropriate delay elements in consideration of the track pattern on the tape 1.

The recording and reproducing processes do not necessarily have to be performed independently. For example, it is possible to record the video signal by the rotary head 2 and simultaneously reproduce the video signal by the rotary head 3. In this case, the address switching signal 13 may be applied to the audio signal so that the writing and reading operations to and from the semiconductor memory 9 are performed during the time slot defined by one digital audio signal data.

Next, a means for detecting whether the semiconductor memory 9 is attached to the recording / reproducing apparatus will be described. When the semiconductor memory 9 mounted on the semiconductor memory storage device 23 is mounted on the recording / reproducing device, the terminal 27 on the semiconductor memory storage device 23 is connected to the ground of the recording / reproducing device. On the other hand, the terminal 28 on the semiconductor memory storage device 23 is connected to the semiconductor memory detection circuit 29. Moreover, in the semiconductor memory storage device 23, the terminals 28 and 27 are always connected. Therefore, in this case, the input line 33 of the semiconductor memory detection circuit 29 is connected to the ground of the recording / reproducing device. When the semiconductor memory 9 mounted on the semiconductor memory storage device 23 is not mounted on the recording / reproducing device, as is clear from the above discussion and FIG.
The input line 33 of 29 is open.

Next, the circuit configuration of the semiconductor memory detection circuit 29 will be described with reference to FIG. The input line 33 is connected to one end of a pull-up resistor 32 to the power source Vcc and the inverter 30.
The output of the inverter 30 is the output of the semiconductor memory detection circuit 29 and is output via the terminal 31. Therefore, the output becomes high level when the semiconductor memory 9 is mounted and low level when the semiconductor memory 9 is not mounted, and it is possible to easily identify whether the semiconductor memory 9 is mounted or not mounted.

In order to guarantee that the output of the semiconductor memory detection circuit 29 is always at the low level in the non-attached state, it is sufficient that the input line 33 does not touch the ground through the conductive material in that state. .. For example, the part of the magnetic tape cassette to which the semiconductor memory storage device 23 is attached may be made of a non-conductive material, and the conventional cassette itself may be used.

When the semiconductor memory storage device 23 is mounted on the magnetic tape cassette, if the input line 33 is not connected to the ground in the reverse orientation or inside out, these erroneous mountings can be detected.

The connection between the semiconductor memory storage device 23 mounted on the magnetic tape cassette and the recording / reproducing device (terminals 24, 25,
26, 27, 28, a power supply not shown, etc.) are performed as follows, for example. That is, the method of connecting / disconnecting by moving the cassette in the vertical direction after inserting the cassette into the device, and connecting / disconnecting by inserting / closing the cassette into the device and then opening / closing the lid for storing the tape. There is.

When the non-mounted state of the semiconductor memory is detected by the above detection means, the following means can be used. When the magnetic tape cassette is mounted in the recording / reproducing apparatus and the semiconductor memory housing device is not mounted, an alarm can be issued by an electronic buzzer or the like to call the operator's attention. Further, it is possible to visually display the non-mounted state of the semiconductor memory by combining the LED, the liquid crystal display device, the light emitting element and the like.

On the other hand, when it is necessary to record the audio signal, the operator mounts the semiconductor memory housing device on the recording / reproducing device to record / reproduce information. In this case, it is convenient to operate the recording / reproducing apparatus so that the semiconductor memory accommodating device can be independently mounted.

Further, when the recording of the audio signal is not required, if the recording mode capable of recording only the information of the video is provided without mounting the semiconductor memory accommodating device on the recording / reproducing device, it is as it is. It is also possible to choose to record video information. When the semiconductor memory is not attached, in order to prevent the audio signal from being lost, the audio may be recorded on the magnetic tape in the audio recording mode that does not require complicated signal processing.

In addition, by providing a spare semiconductor memory in the recording / reproducing apparatus in advance, or by providing a spare slot into which a semiconductor memory accommodating device can be installed and providing the semiconductor memory here, the semiconductor memory is Even when the audio signal has to be recorded when the audio signal is not attached to the insertion slot 52, it is possible to record the information necessary for the audio signal processing in the semiconductor memory provided as a spare. After the information is recorded, it is possible to mount the semiconductor memory storage device in the second insertion slot and transfer the information recorded in the spare semiconductor memory.

FIG. 4 is a schematic diagram of a method of using the recording / reproducing apparatus, which includes a recording / reproducing apparatus 50, a first insertion opening 51, a second insertion opening 52,
It comprises a magnetic tape cassette 53 and a semiconductor memory storage device 23. From the first insertion opening 51, the magnetic tape cassette 53 and the semiconductor memory storage device 23 mounted on the magnetic tape cassette 53 are inserted.
Is inserted. The semiconductor memory storage device 23 is independently inserted from the second insertion opening 52. If you forget to install the semiconductor memory storage device 23 in the cassette 53 and receive an alarm,
The semiconductor memory storage device 23 may be inserted into the second insertion opening. This will complete the preparation without any hassle. Further, when reproducing, only the semiconductor memory storage device 23 may be intentionally inserted from the second insertion opening. By doing so, the audio signal accompanying the video signal can be easily exchanged without taking out the cassette. Further, the semiconductor memory storage device 23 to be inserted from either the first or the second insertion port
It may be possible to use or switch.

In this embodiment, an example of electrical means has been described as the semiconductor memory detecting means, but mechanical means can also be used. That is, the dimensions that change as a result of mounting the semiconductor memory storage device 23 in the cassette 53 may be investigated. To this end, when the cassette 53 is inserted into the recording / reproducing apparatus 50, the state of the probe whose position changes depending on, for example, the thickness of the insert may be detected.

In this embodiment, the video signal and the audio signal are used as the first and second information, respectively, but other cases are also possible. For example, there are an information-compressed video signal and parameters relating to the compression, a video signal and an information-compressed audio signal, a video signal and a video signal for its index.

[0033]

According to the present invention, it is possible to detect whether or not a semiconductor memory, which is a storage medium, is mounted in a recording / reproducing apparatus, so that it is possible to prevent audio signals from being lost during recording of a program. Therefore, it is possible to reliably record the program.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a recording / reproducing apparatus that is an embodiment of the present invention.

FIG. 2 is a diagram showing a recording pattern on a magnetic tape in the example.

FIG. 3 is a circuit diagram of a semiconductor memory detection circuit according to the same embodiment.

FIG. 4 is a schematic view of a method of using the recording / reproducing apparatus in the example.

[Explanation of symbols]

 1 ... Magnetic tape 2, 3 ... Rotating head 5 ... Video recording circuit 6 ... Switch 8 ... A / D conversion circuit 9 ... Semiconductor memory 11 ... Storage address generation circuit 12 ... Multiplexer 14 ... Address recording circuit 15 ... Switch 16 ... Video reproduction Circuit 18 ... Address reproduction circuit 19 ... D / A conversion circuit

Claims (1)

[Claims] 1. A means for recording image information on a recording medium,
Storage address generation means for storing voice information accompanying the image information in a semiconductor memory, storage means for storing the voice information in the semiconductor memory based on the storage address, and the storage address with the image information A recording / reproducing apparatus, comprising: an address recording unit that correlatively records on the recording medium; and a unit that detects a mounting state of the semiconductor memory, and records and reproduces image information and audio information.