JP3199220B2 - Magnetic recording / reproducing 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 magnetic recording / reproducing apparatus connectable to digital information equipment such as a personal computer.

[0002]

2. Description of the Related Art Conventionally, some magnetic recording / reproducing apparatuses use a field memory or a frame memory for performing special reproduction such as slow or stationary, and special effects such as mosaic and solarization. FIG. 3 is a block diagram showing a magnetic recording / reproducing apparatus capable of performing special reproduction and special effects. An analog signal read from a predetermined magnetic recording medium by the magnetic head 1 is converted into a digital signal by the A / D conversion circuit 3 through the analog signal recording / reproducing circuit 2, the changeover switch 19, and the image memory 4. After special reproduction and special effects are applied, the D / A conversion circuit 7
Is converted to an analog signal, and is output from the analog output 12 via the changeover switch 10. Changeover switch 10
Is for switching between a normal video signal and a video signal to which special reproduction or special effects have been applied. At the time of recording, an analog signal input from the analog input 11 is recorded on a predetermined magnetic recording medium by the magnetic head 1 via the analog signal recording / reproducing circuit 2.

Further, in recent years, as shown in FIG. 4, a magnetic recording / reproducing apparatus capable of directly recording digital signals has been commercialized. These devices, which are generally called digital VTRs, have two systems of digital input / output 13 and analog input / outputs 11 and 12 as input / output means during recording. The digital signal is converted into a digital signal by the A / D conversion circuit 3 and is recorded on a predetermined magnetic recording medium by the magnetic head 1 via the digital signal recording / reproducing circuit 14. The changeover switch 17 is for switching between the digital input 13 and the analog input 11. At the time of reproduction, a digital signal is read out by the magnetic head 1, and a selection switch 18 is used to switch between a digital output 13 and an analog output 12 via the digital signal recording / reproduction circuit 14. When an analog output is used, it is converted into an analog signal by a D / A conversion circuit 7.

[0004]

By the way, in recent years, VT
2. Description of the Related Art Video such as R is taken into an information device such as a personal computer, and video from an information device such as a personal computer is taken into a magnetic recording / reproducing device such as a VTR. For this purpose, it is necessary to connect a magnetic recording / reproducing device such as a VTR to an information device such as a personal computer. However, since the magnetic recording / reproducing device described above is mainly of the analog recording type, it is connected to an information device such as a personal computer. Sometimes it is necessary to prepare a peripheral device such as a video capture board on the information device side, which is uneconomical. In addition, since A / D and D / A conversion are performed in addition to D / A and A / D conversion for performing special reproduction and special effects, it is necessary to perform A / D and D / A conversion a plurality of times. It was efficient. Further, when the above-described digital recording type magnetic recording / reproducing apparatus is connected to an information device such as a personal computer, data can be directly exchanged with a digital signal, but since the digital signal does not deteriorate,
Commercialization was difficult due to issues such as copyright. The present invention has been made in view of the above, and connects a magnetic recording / reproducing apparatus to an information apparatus such as a personal computer in order to capture a video signal of the magnetic recording / reproducing apparatus such as a VTR into an information apparatus such as a personal computer. At that time,
A magnetic recording / reproducing device that does not require peripheral equipment for capturing an analog video signal such as a video capture board and converting it into a digital signal, and requires only a small number of circuits to be added to a conventional magnetic recording / reproducing device. The task is to provide

[0005]

As means for solving the above-mentioned problems, a rotating head is used for magnetic recording media.
Analog video signal recording / reproducing analog video signal
Recording and reproducing means and the analog video signal recording and reproducing means.
Playback analog signal processing on the generated analog video signal
An analog signal reproducing circuit to be applied;
A / D conversion means for converting the output of the road into a digital signal;
The digital signal output from the A / D conversion means is applied to a reproduction system.
In order to perform digital signal processing, the A / D conversion means
A memory for temporarily storing a digital signal to be output,
The digital signal read from the memory is converted to an analog image.
D / A conversion means for converting the image signal into an image signal;
Analog output that outputs the analog video signal output from the stage
And a digital signal read from the memory.
Conversion means for converting a digital signal into desired digital data,
The digital data converted by the conversion means is output to the outside.
Digital interface
And a magnetic recording / reproducing apparatus as described above.
Digital video signal on magnetic recording medium using rotating head
Digital video signal recording / reproducing means for recording / reproducing;
Digital video reproduced by digital video signal recording / reproducing means
Digital signal processing that applies playback digital signal processing to the signal
A raw circuit is added to the output of the digital signal reproducing circuit.
Can be output externally via the digital interface
A magnetic recording / reproducing apparatus characterized in that:

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG.
1 is a block diagram showing a configuration of a magnetic recording / reproducing apparatus according to one embodiment, wherein 1 is a magnetic head, 2 is an analog signal recording / reproducing circuit, 3 is an A / D conversion circuit, and 4 is an image memory (field or frame memory). ), 5 is a data conversion circuit,
6 is a digital interface, 7 is a D / A conversion circuit,
Reference numerals 8, 9, and 10 indicate changeover switches, 11 indicates an analog input terminal, 12 indicates an analog output terminal, and 13 indicates a digital input / output terminal.

In the above configuration, the magnetic head 1
Is reproduced by an analog signal recording / reproducing circuit 2 and further converted into a digital signal by an A / D conversion circuit 3. The reproduced signal converted into a digital signal is stored in the image memory 4. The digital signal stored at this time may be a composite signal or an S (Y / C separation) signal.

The digital signal is converted by a data conversion circuit 5 in the next stage into desired digital data such as an RGB signal and a luminance signal + color difference signal which conforms to a digital interface. The converted digital data is output to the digital input / output terminal 13 via the digital interface 6, and is input to an information device such as a connected personal computer. Here, the changeover switch 8 switches between sending the input signal from the image memory 4 to the D / A conversion circuit 7 and sending it to the data conversion circuit 5.

Next, an operation of recording image data of an information device such as a personal computer will be described. Data input from the digital input / output terminal 13 is input to the data conversion circuit 5 via the digital interface 6, and is converted into desired digital data such as a composite signal or an S (Y / C separation) signal by the data conversion circuit 5. After that, the signal is converted into an analog signal by a D / A converter 7 and recorded by the magnetic head 1 through the analog signal recording / reproducing circuit 2 via the changeover switch 9 or by the analog output terminal 12 via the changeover switch 10. It may be output as an analog signal. The changeover switch 9 switches between the output of the analog input terminal 11 and the output of the D / A conversion circuit 7, and the changeover switch 10 selects the output of the analog recording / reproduction circuit 2 and the output of the D / A conversion circuit 7. This is for switching between output and output.

In the above-described embodiment, a field memory or a frame memory for applying special effects such as slow or still, special effects such as mosaic and solarization is used, and the output from the computer or the like is converted before D / A conversion. Since the data is converted into a data format corresponding to the device and output, there is no need to separately prepare an A / D conversion circuit, and it is not necessary to prepare a video capture board on the information device side such as a personal computer.

FIG. 2 is a block diagram of a magnetic recording / reproducing apparatus capable of directly recording digital signals according to another embodiment of the present invention. 1 is a magnetic head, 2 is an analog signal recording / reproducing circuit, 3 is an A / D conversion circuit, 4 is an image memory (field or frame memory), 5 is a data conversion circuit, 6
Is a digital interface, 7 is a D / A conversion circuit, 1
1 is an analog input terminal, 12 is an analog output terminal, 13
Is a digital input / output terminal, 14 is a digital signal recording / reproducing device, and 9, 10, 15, 16, and 19 are changeover switches.

In the above configuration, the digital input / output terminal 13 and the analog input / output terminal 1 serve as input / output means during recording.
Since the digital signal recording / reproducing circuit 14 and the analog signal recording / reproducing circuit 2 are provided, two digital and analog signals can be recorded and reproduced. Normally, for digital signals, the digital signal recording / reproducing circuit 1
4, and the analog signal is processed by the analog signal recording / reproducing circuit 2. The digital signal is input to the D / A conversion circuit 7 via the data converting circuit 5 and converted into an analog signal. , Or output from the analog output terminal 9. An analog reproduction signal from the magnetic head 1 is converted into a digital signal by an A / D converter 2 via an analog signal recording / reproduction circuit 2. The digital signal is converted by the data conversion circuit 5 via the image memory 4 into desired digital data such as an RGB signal and a luminance signal + color difference signal which match the digital interface 6. Then, the digital data passes through the digital interface 6, is output from the digital input / output terminal 13, and is input to an information device such as a connected computer. The changeover switch 15 is for selecting whether to send the signal from the digital interface 6 to the digital signal recording / reproducing circuit 14 or to the data conversion circuit 5, and the changeover switch 16 is used to select the signal from the digital signal recording / reproducing circuit 14 This is for selecting a signal from the data conversion circuit 5. In the above-described embodiment, a digital device of another format can be connected by inserting a format converter between the data converter 5 and the digital interface 6.

In the above-described embodiment, when an analog signal is reproduced, a field memory or a frame memory for applying special reproduction such as slow or still or special effects such as mosaic and solarization is used, and the output is D / A converted. Since the data is converted into a data format compatible with an information device such as a computer before being output, there is no need to separately prepare an A / D conversion circuit, and since the digital interface is shared between analog and digital, the number of parts is reduced. .
Also, there is no need to prepare a video capture board on the information device side such as a personal computer, and digital image data from the information device such as a personal computer can be digitally recorded as data or analog recorded as a video signal.

When the present invention is applied to a magnetic recording / reproducing apparatus capable of analog recording / reproducing, it utilizes a field memory or a frame memory for performing special reproduction such as slow or stationary, and special effects such as mosaic and solarization. Before the output is D / A converted, the data is converted into a data format compatible with an information device such as a computer and then output, so that the magnetic recording / reproducing apparatus of the analog recording / reproducing method can be easily connected to an information device such as a personal computer. Since the above-mentioned memory can be used as a buffer memory of the digital interface, the number of additional circuits such as an A / D conversion circuit is small, and an information device such as a personal computer can fetch an analog video signal from a video capture board or the like. Uses peripheral devices to convert to digital signals Need to be is eliminated, the cost is reduced. When the present invention is applied to a magnetic recording / reproducing device capable of recording / reproducing both digital and analog signals, in addition to the above-described effects, the digital interface can be an analog / digital signal.
The number of parts is reduced because it is shared digitally .

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of a magnetic recording / reproducing apparatus according to another embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional analog recording type magnetic recording / reproducing apparatus.

FIG. 4 is a block diagram showing the configuration of a conventional digital recording magnetic recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head 2 Analog signal recording / reproduction circuit 3 A / D conversion circuit 4 Image memory 5 Data conversion circuit 6 Digital interface 7 D / A conversion circuit 14 Digital signal recording / reproduction circuit

Claims (2)

(57) [Claims] 1. A magnetic recording medium using a rotary head,
Analog video signal recording / reproduction for recording / reproducing video signals
Means and an analog signal reproduced by the analog video signal recording / reproducing means.
An analog signal that performs playback analog signal processing on video signals
No. converting and reproducing circuit, an output of said analog signal reproduction circuit to a digital signal
A / D converting means for converting the digital signal output from the A / D converting means into a reproduction system.
In order to perform digital signal processing, the A / D conversion means
A memory for temporarily storing a digital signal to be output, and a digital signal read from the memory for analog video.
A D / A converting means for converting the image signal, the output analog video signal of the D / A converter outside
An analog signal output means for outputting the digital signal read from the memory to a desired digital signal.
Out a conversion means for converting the barrel data, the digital data converted by said converting means to the outside
Digital interface
Magnetic recording and reproducing apparatus. 2. A digital recording method for a magnetic recording medium using a rotary head.
Digital video signal recording / reproduction for recording / reproducing video signals
Means and a digital signal reproduced by the digital video signal recording / reproducing means.
A digital signal that performs playback digital signal processing on video signals
No. anda regeneration circuit, the output of the digital signal reproduction circuit, the digital-in
It is possible to output to the outside via the interface
The magnetic recording / reproducing apparatus according to claim 1, wherein