JPH06176480A - Recording/reproducing device - Google Patents

Abstract

PURPOSE:To reduce costs by providing a switching section and sharing an A/D converter at the time of reproducing an analog medium and at the time of recording on a digital medium. CONSTITUTION:At the time of reproducing the analog medium, an analog signal read out by a magnetic head 71 is digitized by an A/D converter 1 via an amplifier 9, equalizer 11, an N/R 12 and a switch SW 1 and given to a digital output terminal OD via a switch SE 2 and a digital section 4. Also, the output of the N/R 12 is outputted from an analog output terminal OA. At the time of reproducing a digital medium, a digital signal read out by the head 71 is transformed into an analog one by a D/A converter 3 via the amplifier 9, an equalizer 10 and a digital signal processing section 5 and outputted from the terminal OA via a switch SW 4. At the time of analog input, after converted by a converter 1 it is recorded via the processing section 5. Further, at the time of digital input, it is recorded by the head 71 via a digital input section 2, the switch SW, the processing section 5 and the amplifier 6. Like this, the A/D converter is shared by switching it.

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 reproducing a digital medium and an analog medium and recording on the digital medium.

[0002]

2. Description of the Related Art A digital tape, which is a digital recording type magnetic cassette tape having a shape similar to an analog tape which is an analog recording type magnetic cassette tape, has been put into practical use. This multi-recorder for recording / reproducing a digital tape has a magnetic head having both a magnetic gap for recording / reproducing a digital tape and a magnetic gap for reproducing an analog tape. It is possible to play back tapes and record / play back digital tapes.

In many multi-recorders, since the signal source of the signal to be recorded outputs an analog signal, an A / D converter for converting an analog input signal into a digital signal is provided. Then, the signal converted into a digital signal by this A / D converter is subjected to predetermined processing, and then recorded on a digital tape via a magnetic head.

Such a multi-recorder is currently drawing attention because it can utilize both software using an existing analog tape as a medium and software using a high-quality digital tape. On the other hand, when such a high-quality digital tape is connected to, for example, an amplifier, if the reproduction signal is transmitted in the form of an analog signal, the high-quality sound of the digital tape is deteriorated due to the influence of external noise.

Therefore, in such a multi-recorder, the digital data recorded on the digital tape is recorded by the D / A.
Along with the analog output terminal that outputs the analog output signal converted by the converter, the digital output terminal that outputs the digital output signal that converts the digital data recorded on the digital tape into a predetermined format is provided. Is transmitted by digital transmission.

The analog signal recorded on the analog tape is output from the analog output terminal via an equalizer or the like.

[0007]

In the above multi-recorder, since the signal recorded on the analog tape is only the analog output, it is still susceptible to the noise of the transmission system. Therefore, it is conceivable to convert the analog signal reproduced from the analog tape into a digital signal and output it from the digital output terminal. In this case, an A / D for converting the analog signal reproduced from the analog tape into a digital signal. A converter is required, which increases the cost.

The present invention solves such a problem.

[0009]

In order to solve the above problems, the present invention is directed to an analog reproducing section for reproducing an analog medium recorded in analog and an analog input signal given to an input terminal to be converted into a digital signal. In a recording / reproducing apparatus including an A / D converter and a digital recording unit that records information based on the output of the A / D converter on a digital medium, a digital output terminal and a first switching signal It is characterized by comprising a switching section for selectively supplying the reproduction output signal of the analog reproducing section and the analog input signal supplied to the input terminal to the A / D converter.

[0010]

When the analog input signal is recorded on the digital medium, the signal is guided from the analog input terminal to the digital recording unit through the A / D converter by switching the switching unit.
Digitally record analog input signals. On the other hand, when reproducing the analog medium, the signal from the analog reproducing section is output to the digital output terminal through the A / D converter by switching the switching section.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. The terminals IA and ID are terminals for analog signal input and digital signal input, respectively, to which a signal from an external signal source (not shown) is applied.

The terminal IA is a fixed contact B1 of the switch SW1.
And is connected to the A / D converter 1 when the movable contact A1 is on the fixed contact B1 side. The A / D converter converts an analog signal given from the movable contact A1 of the switch SW1 into a digital signal and outputs it to a fixed contact C2 of the switch SW2 and a fixed contact B3 of the switch SW3.

On the other hand, the terminal ID is connected to the digital input section 2. The digital input unit 2 converts digital data of a predetermined format given from an external signal source through a terminal ID into the same format as the digital signal output from the A / D converter 1 (hereinafter referred to as an internal format) and switches it. Output to fixed contact C3 of SW3. The switch SW3 is adapted to connect the movable contact A3 to either one of the fixed contacts B2 and B3 in response to the switching signal S3. With this switch SW3, a digital signal corresponding to the terminal IA and a digital signal corresponding to the terminal ID are connected. One of the signals is given to the terminal 51 of the digital signal processing section 5 via the movable contact A3.

The digital signal processor 5 converts the digital signal supplied from the terminal 51 into a PASC (Precision Adaptive S / S) signal.
After compressing based on the ub-band coding method, adding error correction data and the like, processing such as conversion of the number of bits of the data is performed and output from the terminal 52. Further, the digital signal processing unit 5 performs a conversion opposite to the conversion from the terminal 51 to the terminal 52 described above on the digital signal supplied from the terminal 53 and outputs the digital signal to the terminal 54.

The digital signal processor 5 has a terminal 53.
A timing signal obtained by detecting the timing of the digital signal supplied from the terminal 55 is output from the terminal 55, and the subcode included in the digital signal supplied from the terminal 53 is extracted and output from the terminal 56. The digital signal output from the terminal 52 of the digital signal processing unit 5 is given to the magnetic head 71 of the deck 7 via the amplifier 6.

The deck 7 is a tape 81 of a digital tape 8.
The magnetic head 71 in contact with the tape 81 to record a signal on the tape 81,
The signal recorded on the tape 81 is reproduced.
As a result, the digital signal given through the amplifier 6 is recorded on the digital tape 8, and the signal recorded on the digital tape 8 is read and given to the amplifier 9.

The magnetic head 71 will be described below.
FIG. 2 is a plan view showing the structure of the magnetic head. The magnetic head 71 includes a digital recording gap G1 corresponding to a plurality of digital tracks, a digital reproduction gap G2 corresponding to a plurality of digital tracks, and a gap G3 corresponding to a plurality of analog reproduction tracks. ing. The output of the amplifier 6 is applied to the gap G1, and the signal read in the gap G2 and the signal read in the gap G3 are applied to the amplifier 9.

Although the gaps G1 and G2 are shown in a larger size in FIG. 2, the width occupied by the gap G1 and the width occupied by the gap G3 are substantially the same. The amplifier 9 amplifies the signal read from the gaps G2 and G3, waveform-shapes the signal read from the gap G2 by the equalizer 10 and supplies the signal to the terminal 53 of the digital signal processing unit 5, and also equalizes the signal read from the gap G3. Give to. The terminal 54 of the digital signal processing unit 5 is a switch S
It is connected to the fixed contact B2 of W2 and the D / A converter 3. The signal analog-converted by the D / A converter 3 is given to the fixed contact B4 of the switch SW4.

The timing signal output from the terminal 55 of the digital signal processing section 5 is given to the deck 7 via the servo circuit 13 when the digital tape 8 is reproduced. The traveling speed of the tape 81 is feedback-controlled. still,
At the time of reproducing the analog tape, the operation prohibiting signal is given from the control unit 14 to the servo circuit 13 so that erroneous feedback control is not performed.

The switch SW2 connects the movable contact A2 to either one of the fixed contacts B2 and C2 according to the switching signal S2. The movable contact A2 of the switch SW2 is connected to the digital output unit 4. The digital output unit 4 converts a digital signal in an internal format into a predetermined format and outputs it from the terminal OD.

The equalizer 11 corrects the reproduction characteristic of the gap G3 by emphasizing the low frequency component of the signal from the gap G3 given from the amplifier 9. Then, the noise reduction (N / R) 12 performs noise removal processing on the output of the equalizer 11, and the fixed terminal C of the switch SW4.
4 and the fixed contact C1 of the switch SW1. The switch SW4 responds to the switching signal S4 and outputs the analog output terminal OA.
The movable contact A4 connected to is connected to one of the fixed contacts B4 and C4.

The control unit 14 switches the switches SW1 to SW4 by the switching signals S1 to S4 and controls each unit. In relation to the control unit 14, an operation unit 15 for inputting an operation by an operator and a display unit 16 for displaying various kinds of information are provided. Next, the operation of the control unit 14 will be described. Table 1 shows the states of the switches SW1 to SW4 for the reproduction and recording modes.

[0023]

[Table 1]

The operation of this embodiment will be described below with reference to Table 1. (1) Reproduction of analog tape When reproducing the analog tape, the movable contacts A1 of the switch SW1 are switched to the fixed contact C1 side by the switching signals S1 to S4 output from the control unit 14, and the fixed contact of the switch SW2 is also used. A2 is switched to the fixed contact C2 side, and the movable contact A4 of the switch SW4 is fixed contact C.
Switch to 4 side.

As a result, the gap G of the magnetic head 71 is
The analog signal read by 3 is the amplifier 9 and the equalizer 1
1, is given to the A / D converter 1 via the N / R 12, and the switch SW1 and is converted into a digital signal by the A / D converter 1, and then via the switch SW2 and the digital output unit 4,
It is given to the digital output terminal OD. In addition, N / R12
The signal output from is also output from the analog output terminal OA via the switch SW4.

(2) Reproduction of digital tape When the digital tape is reproduced, the movable contact A2 of the switch SW2 is switched to the fixed contact B2 side by the switching signals S1 to S4 output from the control unit 14, and the switch SW4 is also used. The movable contact of is switched to the fixed contact B4 side. As a result, the digital signal read by the gap G2 of the magnetic head 71 is given to the D / A converter 3 via the amplifier 9, the equalizer 10, and the digital signal processing unit 5 and converted into an analog signal, and then the switch SW4 is turned on. Is output from the analog output terminal OA.

The digital signal from the digital signal processing section 5 is also output from the digital output terminal OD via the switch SW2 and the digital output section 4. (3) Recording on digital tape (in the case of analog input) When recording an analog signal input from the analog input terminal IA on the digital tape, the switch SW1 is moved by the switching signals S1 to S4 output from the control unit 14. The contact A1 is switched to the fixed contact B1 side, the movable contact A2 of the switch SW2 is switched to the fixed contact B2 side,
The movable contact A3 of the switch SW3 switches to the fixed contact B3 side, and the movable contact A4 of the switch SW4 changes to the fixed contact B4.
Switch to the side.

As a result, the analog signal input from the analog input terminal IA is A / D via the switch SW1.
After being supplied to the converter 1 and converted into a digital signal, it is supplied to the gap G1 of the head 71 through the switch SW3, the digital signal processing unit 5, and the amplifier 6 and recorded on the digital tape. The digital signal recorded on the digital tape by the gap G1 is read by the gap G2 immediately after recording and is output from the analog output terminal OA and the digital output terminal OD as in the reproduction of the digital tape.

(4) Recording on digital tape (in the case of digital input) When recording a digital signal input from the digital input terminal ID on the digital tape, switching is performed by switching signals S2 to S4 output from the control unit 14. The movable contact A2 of SW2 switches to the fixed contact B2 side, and the movable contact A3 of the switch SW3 switches to the fixed contact C3 side.
Further, the movable contact A4 of the switch SW4 is switched to the fixed contact B4 side.

As a result, the digital signal given from the digital input terminal ID is sent to the digital input section 2 and the switch S.
It is given to the gap G1 of the magnetic head 71 through W3, the digital signal processing section 5, and the amplifier 6 and recorded on the digital tape. In addition, the digital signal recorded on the digital tape by the gap G1 has a gap G immediately after recording.
It is read at 2, and is output from the analog output terminal OA and the digital output terminal OD as in the reproduction of the digital tape.

As described above, according to this embodiment, the A / D converter 1 can be used both for reproducing the analog tape and for recording the digital tape, and the A / D for reproducing the analog tape can be used. The cost can be reduced as compared with the case where the converter is separately provided.

[0032]

As described above in detail, according to the present invention, the A / D converter can be used both during reproduction of the analog medium and during recording on the digital medium, and the reproduction of the analog medium can be performed. It is not necessary to separately provide an A / D converter for
The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a plan view showing the configuration of a magnetic head.

[Explanation of symbols]

 1: A / D converter 2: Digital input part 3: D / A converter 4: Digital output part 5: Digital signal processing part 6, 9: Amplifier 7: Deck 71: Magnetic head 8: Digital tape 10, 11: Equalizer 12: N / R 13: Servo circuit 14: Control unit 15: Operation unit 16: Display unit SW1 to SW4: Switch IA: Analog input terminal ID: Digital input terminal OA: Analog output terminal OD: Digital output terminal

Claims (1)

[Claims] 1. An analog reproducing section for reproducing an analog medium recorded in analog, an A / D converter for converting an analog input signal given to an input terminal into a digital signal, and an output of the A / D converter. In a recording / reproducing apparatus including a digital recording unit for recording information based on a digital medium, a reproduction output signal of the analog reproducing unit and an analog input signal given to the input terminal are output according to a first switching signal. A recording / reproducing apparatus, comprising: a switching unit for selectively applying to the A / D converter, and a digital output terminal for outputting a reproduction output signal of the analog reproducing unit via the A / D converter.