JPH04355267A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To expand the application area of a recording and reproducing device consisting of a digital audio tape recorder by diverting it to an external storage device such as computer. CONSTITUTION:Only when the recording and reproducing of digital data are set by a data recording and reproducing setting means and it is detected by a data detection means that an input digital signal car reproduced digital signal is digital data, an input/output device 2 records and reproduces the digital data. Thus, the recording and reproducing device which can easily be divert as the external storage device such as a computer 4 can be realized and therefore, the application area can be improved.

Description

[Detailed description of the invention]

0001

[Table of Contents] The present invention will be explained in the following order. Industrial application fields Problems to be solved by conventional technical inventions Means for solving problems (Figure 1) Effects (Figure 1) Examples (Figures 1 to 5) (1) Overall configuration (Figure 1) ( 2) Format of digital signals DA1 and DA2 (
Figures 2 to 4) (3) Input/output circuit (Figure 5) (3-1) Recording mode (3-2) Playback mode (4) Effects of the embodiment (5) Effects of the invention of other embodiments

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and reproducing apparatus, and is suitable for use when, for example, a digital audio tape recorder is used as an external storage device for a computer or the like.

0003

2. Description of the Related Art Conventionally, in this type of recording and reproducing apparatus, recording tracks are sequentially formed diagonally on a magnetic tape so that digital audio signals can be recorded and reproduced (hereinafter referred to as a digital audio tape recorder). ).

[0004] In this type of digital audio tape recorder, after converting an audio signal into a digital signal, interleaving processing is performed at a predetermined period.
Recording is done by adding an error detection and correction code,
This effectively avoids the effects of dropout, etc.
It is designed to record high-quality audio signals at high density.

Furthermore, this type of digital audio tape recorder is capable of inputting and outputting digital audio signals in a predetermined format (IEC-458 standard) via a predetermined interface circuit, so that digital audio signals of a predetermined format (IEC-458 standard) can be input and output, for example, from a compact disc player. By directly recording the output digital audio signal, it is possible to effectively avoid deterioration in sound quality caused by analog-to-digital conversion processing and digital-to-analog conversion processing.

[0006]

However, it would be convenient if this type of digital audio tape recorder could be used as an external storage device for a computer or the like.

In other words, if it were possible to switch the connection of a digital audio tape recorder connected to an audio device and use it as an external storage device as needed,
It is believed that the field of application of the digital audio tape recorder can be expanded and the usability can be improved.

However, this type of digital audio tape recorder needs to operate in accordance with a serial copy management system (SCMS) that manages copies of digital signals over generations.

In practice, according to this SCMS, when digital data is input from a computer, etc., the digital audio tape recorder is prohibited from recording, which causes the problem that it cannot be used as an external storage device for computers, etc. It was hot.

The present invention has been made in consideration of the above points, and is intended to propose a recording and reproducing device that can be used as an external storage device for computers and the like.

[0011]

[Means for Solving the Problems] In order to solve the problems, in the present invention, the digital audio signal DA1
, has an input/output means 2 for DA2, and has a digital signal DA consisting of a digital audio signal or digital data.
1. In the recording and reproducing device 3 which is capable of recording and reproducing DA2, data recording and reproducing setting means 4 sets (RC) to record and reproduce digital data DA1 and DA2, and input digital signal DA1. , DA2
Or the reproduced digital signal is digital data D1,
A data detection means for detecting whether or not D2 is present is provided.

0012

[Operation] Digital data D1, D2 are set to be recorded and reproduced, and digital signals DA1, D are input.
By recording or reproducing the digital data D1, D2 only when it is detected that A2 or the reproduced digital signals DA1, DA2 are the digital data D1, D2, it is possible to easily store the digital data D1, D2 in an external storage device such as a computer 4. It can be used as

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall configuration In FIG. 1, 1 indicates a computer system as a whole, and data is input and output between a digital audio tape recorder (DAT) 3 and a computer 4 via an input/output device 2. The digital audio tape recorder 3 can be used as an external storage device for the computer 4.

That is, the computer 4 inputs and outputs desired data D1 and D2 to and from the input/output device 2 via the bus BUS, and also performs control to input and output data to and from the digital audio tape recorder 3. Signal R
As a result, the digital audio tape recorder 3 is controlled to be able to record and reproduce data.

The input/output device 2 converts the input data D1 input from the computer 4 into a digital signal DA1 according to the IEC-458 digital interface format, and outputs the digital signal DA1 to the digital audio tape recorder 3. do.

The digital audio tape recorder 3 is in a state where it can record and reproduce data set under the control of the computer 4, and when a digital signal DA1 is input in place of the digital audio signal, it sequentially records the data. Thus, the data D1 of the computer 4 can be easily recorded on the magnetic tape.

Further, in the digital audio tape recorder 3, when the operation mode is switched to the playback mode, the playback data obtained by playing back the magnetic tape is transferred to the IE.
It is converted into a digital signal DA2 according to the C-458 digital interface standard and sequentially output.

When the operation mode of the digital audio tape recorder 3 becomes the reproduction mode, the input/output device 2 converts the digital signal DA2 outputted from the digital audio tape recorder 3 into the original data D2, and sends the data D2 to the computer 4. Output to.

As a result, the computer 4 can connect the digital audio tape recorder 3 as necessary, use the digital audio tape recorder 3 as an external storage device, and input and output desired data D1 and D2. ing.

(2) Format of digital signals DA1 and DA2 In practice, according to the IEC-458 digital interface standard, as shown in FIG.
Frame data of one frame is arranged to continuously form digital signals DA1 and DA2 (Fig. 2).
(A)).

The frame data (FIG. 2(B)) is formed of two consecutive channels of subframe data, which is input to the digital audio tape recorder 3, and
Each subframe data is assigned to the right and left channels and sequentially recorded in the format shown in FIG. 3.

That is, the digital audio tape recorder 3 divides each recording track into two recording areas in the longitudinal direction to form four recording areas in one interleave period.

For these four recording areas, the digital audio tape recorder 3 sequentially records the even-numbered frame data of one channel among the continuous frame data from frame 0 to frame 191 on the recording track TA of the positive azimuth angle. The data is recorded in the first recording area, and then the odd-numbered frame data of the second channel is recorded in the second recording area.

Further, the digital audio tape recorder 3 records the even-numbered frame data of the second channel in the first recording area for the subsequent recording track TB of the negative azimuth angle, and then records the odd-numbered frame data of the first channel. Record in the second recording area.

At this time, the digital audio tape recorder 3 performs interleave processing on the subframe data within each recording track TA, TB, and then records the subframe data with an error detection and correction code added thereto, thus distributing the reproduced data for each recording track. It is designed to allow error correction processing.

[0027] With this, the digital audio tape recorder 3 changes the arrangement of the reproduced data in the opposite direction to that of recording during reproduction, and then performs interpolation processing on the reproduced data that could not be error-corrected based on the previous and subsequent reproduced data. For example, even if a dropout occurs in one recording track TA or TB of a pair, the generation of abnormal noise can be effectively avoided.

FIG. 2 (C
), the first 4 bits are the synchronization preamble,
The next 4 bits are allocated for the transmission of auxiliary data;
Desired transmission data is transmitted with 0 bits.

Therefore, in the digital audio signal of the IEC-458 standard, audio data is allocated to the transmission data DX, and the digital audio tape recorder 3
In this system, a digital audio signal can be recorded by extracting audio data from the transmission data DX and converting it into a recording signal.

The first bit V of the following four bits is assigned to a validity flag indicating whether the audio data is valid or invalid, and in the digital audio tape recorder 3, when the playback data is interpolated, the flag is set to "1". ”.

On the other hand, the following 1 bit U is assigned to a user bit flag, the following 1 bit C is assigned to channel status data, and the remaining 1 bit P is assigned to a parity bit.

[0032] As a result, the digital audio tape recorder 3 is able to detect information regarding transmission data by sequentially detecting user bits U and channel status C for frame data from frame 0 to frame 191. .

That is, as shown in FIG. 4, in channel status C, control data is transmitted in frames 0 to 5. For example, when transmitting digital data, this control data is
000”. Furthermore, in channel status C, the mode is expressed by the frame data of the following 6 and 7 frames, and the category code is transmitted by the frame data of the subsequent 8 to 15 frames.

In the digital audio tape recorder 3, user bits U, channel status C, etc. are allocated and recorded in a subcode recording area and a subdata recording area, respectively, depending on their contents, such as sampling frequency, etc. Regarding the information, the operation is changed depending on the content.

Furthermore, the digital audio tape recorder 3 is designed to detect bit errors in the input digital signal DA1 based on the parity bit P.

(3) Input/output device (3-1) Recording mode As shown in FIG.
PU) 8 converts input data D1 and digital signal DA2 in accordance with the IEC-458 standard.

At this time, in the central processing unit 8,
Control data DCN output from the computer 4 is taken in via the control bus BUS, and the operation of the entire input/output device 2 is switched based on the control data DCN.

In other words, when input data D1 is to be recorded on the digital audio tape recorder 3, the central processing unit 8 sets the digital audio tape recorder 3 to the recording mode and then controls it from the computer 4 in response to keyboard operations. When data DCN is output, the operation mode of the input/output device 2 is switched to recording mode.

At this time, the computer 4 also sends a control signal RC indicating that data is to be output to the digital audio tape recorder 3, and as a result, the digital audio tape recorder 3 is controlled to the data recording mode.

When input data D1 is input from the computer 4 in this state, the central processing unit 8 outputs a control signal to the buffer memory 10, and stores the input data D1 in the buffer memory 10.

At this time, the central processing unit 8 stores the predetermined control code DC in the buffer memory 10 in advance together with the synchronization preamble data, the user bit U, the channel status C data, etc., and converts the data stored in the buffer memory 10 into the input data D1. It is also sequentially output to the parallel-to-serial conversion circuit 11.

[0042] Here, the parallel-serial conversion circuit 11 is
After converting the output data DP1 of the buffer memory 10 into serial data, it is outputted via the output circuit 13. As a result, the input/output device 2 assigns the transmission data DX to the input data D1, converts it into a digital signal DA1, and sends it to the digital audio tape recorder 3.

At this time, the central processing unit 8 sets the control data to "0" for the channel status C.
1X000" (in other words, to transmit digital data), and set the mode data to
”, the remaining channel status C data is set to a predetermined value, and data “0” is stored as the validity flag V data.

Normally, in the digital audio tape recorder 3, based on the serial copy management system (SCMS), bits 0 and 1 of the channel status C of the input digital signal are "
00'', it is determined that the signal is other than a digital audio signal and recording is stopped.

However, in the digital audio tape recorder 3 of this embodiment, when the control signal RC representing input/output of data from the computer 4 is input, bit 0 and bit 1 of the channel status C are input.
is other than "00", and the recording operation is performed only when the value is other than "00", whereby the digital signal DA1 consisting of the input data D1 of the computer 4
can be recorded on magnetic tape.

At this time, in the digital audio tape recorder 3, the format ID for recording the digital signal on the magnetic tape is set to "01" indicating that it is for data, and the format ID for audio is set to "00". ” so that they can be distinguished from each other.

(3-2) Playback Mode On the other hand, in the playback mode, the digital audio tape recorder 3 plays back the magnetic tape when the control signal RC representing data input/output from the computer 4 is input. It is detected whether the format ID of the digital signal obtained by
The signal is sent to the input/output device 2 as a digital signal DA2 based on the 458 digital interface standard.

On the other hand, the central processing unit 8 outputs a control signal to start up the operation of the input circuit 16 and the serial/parallel conversion circuit 18, and as a result, the input/output device 2 receives the digital signal DA2 output from the digital audio tape recorder 3. After converting into parallel data DP2 in 8-bit units in the serial-parallel conversion circuit 18, the data is sequentially stored in the buffer memory 10.

The central processing unit 8 takes out the parallel data DP2 stored in the buffer memory 10 at a predetermined timing, and retrieves the resulting data D2.
is outputted to the computer 4 via the bus BUS, and in this way the digital audio tape recorder 3 can be used as an external storage device of the computer 4.

(4) Effects of the Embodiment According to the above configuration, the digital audio tape recorder 3 records data only when the control signal RC indicating input/output of data D1 and D2 from the computer 4 is input. By making it possible to play back data, it is possible to realize a digital audio tape recorder that can be used as an external storage device of the computer 4.

[0051] In this way, the field of application of the digital audio tape recorder can be greatly expanded,
It is possible to realize a digital audio tape recorder 3 that can greatly improve usability for the user.

(5) Other Embodiments In the above-described embodiments, whether or not to record or reproduce data is determined in accordance with the control signal input from the computer. The same effects as in the above-described embodiments can be achieved even if the user can set the settings using a remote controller or the like.

Furthermore, in the above embodiment, a case was described in which data input/output from a computer is recorded and reproduced; however, the present invention is not limited to this, and the present invention is applicable to measurement data input/output from various measuring devices, etc. It can also be widely applied to recording and reproducing image data and the like.

Further, in the above-described embodiments, a case has been described in which the recording and reproducing apparatus according to the present invention is applied to a digital audio tape recorder, but the present invention is not limited to this, and the present invention is not limited to this. If it is possible to do so, it is suitable for wide application to other recording and reproducing devices such as magneto-optical disk devices.

[0055]

As described above, according to the present invention, there is provided a recording and reproducing apparatus which has input/output means for digital audio signals and is capable of recording and reproducing digital signals consisting of digital audio signals or digital data. In this system, digital data recording and playback is set, and digital data is recorded and played only when the input digital signal or the reproduced digital signal is digital data, so that it can be easily used as an external storage device for computers, etc. It is possible to realize a recording and reproducing device that can be used for other purposes, thereby expanding the field of application of the recording and reproducing device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a computer system according to one embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining the digital signal.

FIG. 3 is a schematic diagram showing a recording format.

FIG. 4 is a chart for explaining channel status.

FIG. 5 is a block diagram showing an input/output device.

[Explanation of symbols]

1...computer system, 2...input/output device, 3...
... Digital audio tape recorder, 4 ... Computer, 8 ... Central processing unit, 10 ... Buffer memory, 11 ... Parallel-serial conversion circuit, 18 ... Serial-parallel conversion circuit.

Claims (1)

[Claims] 1. A recording and reproducing device having an input/output means for digital audio signals and capable of recording and reproducing the digital audio signal or a digital signal consisting of digital data, the recording and reproducing device recording and reproducing the digital data. and a data detection means for detecting whether the input digital signal or the reproduced digital signal is the digital data, and records and reproduces the digital data. is set and the digital data is recorded or reproduced only when it is detected that the input digital signal or the reproduced digital signal is the digital data.