JPH0520788A - Magnetic reproducing device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a magnetic reproducing apparatus, and in particular, can be applied to a digital audio tape recorder to reproduce recorded information of audio data from sequentially continuous recording tracks even in the case of NT servo, for example. To do so. By selectively taking in recording information according to a recording area, it is possible to reproduce consecutive recording information in the order of recording tracks even when the magnetic head scans across the recording tracks.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology (FIG. 3) Problem to be Solved by the Invention (FIG. 3) Means for Solving the Problem (FIG. 1) Action (FIG. 1) Example (FIGS. 1 and 2) (1 ) Configuration of Embodiment (FIGS. 1 and 2) (2) Operation of Embodiment (3) Effect of Embodiment (4) Other Embodiment Effect of Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic reproducing apparatus, and is particularly suitable for being applied to a digital audio tape recorder.

[0003]

2. Description of the Related Art Conventionally, in a digital audio tape recorder of this type, a corresponding digital head drives a magnetic tape running system so as to scan each recording track a plurality of times, and thus the digital audio tape recorder has a simple structure as a whole. Some are designed to reproduce signals (hereinafter referred to as NT Servo's digital audio tape recorder).

That is, in the NT servo digital audio tape recorder, audio data that is repeatedly obtained is selectively stored in the memory circuit based on the error detection and correction result.

At this time, in the digital audio tape recorder, each audio data is stored in the memory circuit in a unit of interleave processing based on the frame address (that is, in a unit of a pair of recording tracks), and then the audio data is stored. Data is subjected to error detection and correction processing.

Further, in the digital audio tape recorder, when the error detection / correction processing is completed, the audio data is sequentially output in a predetermined order, and thereby the audio data is deinterleaved and output. As a result, in the digital audio tape recorder of the NT servo, the digital audio signal can be reproduced without just tracking the corresponding recording track by the magnetic head, and the entire structure can be simplified accordingly. Has been done.

[0007]

By the way, in this kind of digital audio tape recorder, it is possible to record sub-code data (for example, recording information such as program time and absolute time) in addition to audio data. The data of the subcode is reproduced to improve the usability.

[0008] Therefore, even in the NT servo digital audio tape recorder, if the data of the sub-code can be reproduced, the usability can be improved and it is considered to be convenient.

However, in the case of the NT servo, each magnetic head scans across the recording track, so that each magnetic head scans a plurality of recording tracks in one scan.
Therefore, in the NT servo, even if the subcode data is reproduced, there is a problem that it cannot be put to practical use in practice.

That is, as shown in FIG. 3, in the digital audio tape recorder, the area SW1 on the scan start end side and the area SW on the scan end end side of each recording track are recorded.
Data of the first and second subcodes are recorded in 2 respectively, and a recording area PCM for audio data is formed between the areas SW1 and SW2. On the other hand, in the NT servo, as indicated by arrows a, b, c, d, ...
The magnetic head scans across the recording track.

Therefore, in the NT servo, even if the sub-code data is reproduced from the first recording area SW1 by the scanning shown by the arrow a, for example, the sub-scanning from the second recording area SW2 is performed by the following scanning of the arrow b. The code data may be reproduced. By the subsequent scanning of arrow c, the subcode data is reproduced from the first recording area SW1 this time,
Eventually, it becomes difficult to sequentially reproduce subcode data from continuous recording tracks.

Therefore, in the case of the NT servo, for example, when the program time is selected and used from the data of the sub-code, the time changes discontinuously and cannot be used eventually. Further, for example, in the start ID, the logic level may change each time scanning is performed.

The present invention has been made in consideration of the above points, and an object of the present invention is to propose a magnetic reproducing apparatus capable of reproducing recorded information of a digital audio signal sequentially from a continuous recording track even in the case of NT servo. It is a thing.

[0014]

In order to solve such a problem, according to the present invention, the magnetic heads 6 corresponding to the respective recording tracks formed on the magnetic tape 2 in a slanting sequence are provided.
The magnetic tape 2 is run and the rotary drum 4 is driven so that A and 6B scan a plurality of times, and the magnetic head 6A,
In the magnetic reproducing apparatus 1 which reproduces and outputs the digital audio signal D1 recorded on the magnetic tape 2 by selectively taking in the reproducing signal S1 outputted from 6B, the magnetic tape 2 is the longitudinal direction of the recording track TR. Has an audio signal recording area PCM and a plurality of recording information recording areas SW1 and SW2.
While recording the digital audio signal D1 on M,
Recording information (SBDT) of the digital audio signal D1 is recorded in each of the recording information recording areas SW1 and SW2,
The magnetic reproducing device 1 includes a plurality of recording information recording areas SW1 and S1.
Predetermined recording information recording area SW1 (SW2) from W2
Is selected to reproduce the record information (SBDT) from the record information recording area SW1 (SW2) and output it together with the digital audio signal D1.

[0015]

The predetermined recording information recording area SW1 (SW2) is selected from the plurality of recording information recording areas SW1 and SW2,
From the recording information recording area SW1 (SW2), the recording information (S
If the BDT) is reproduced, even in the case of the NT servo, the digital audio signal D1 is sequentially recorded from consecutive recording tracks.
The recorded information (SBDT) can be reproduced.

[0016]

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

(1) Configuration of the Embodiment In FIG. 1, reference numeral 1 denotes an NT servo type digital audio tape recorder as a whole, which reproduces a digital audio signal recorded on a magnetic tape 2.

That is, in the digital audio tape recorder 1, the magnetic tape 2 is made to run at the same running speed as that at the time of recording, and the rotary drum 4 is driven at a rotation speed twice as high as that at the time of recording, thereby the magnetic head 6A and the magnetic head 6A. The magnetic tape running system is controlled so that 6B scans the same recording track twice each.

Thus, the digital audio tape recorder 1 can selectively process the reproduction signal S1 output from the magnetic heads 6A and 6B to reproduce the digital audio signal with a simple structure.

That is, in the digital audio tape recorder 1, the demodulation circuit 10 inputs the reproduction signal S1 via the reproduction amplifier circuit 8 and extracts the clock signal from the reproduction signal S1. Further, the demodulation circuit 10 demodulates the reproduction data D1 by performing 10-8 conversion of the reproduction signal S1 on the basis of the clock signal, and the data output circuit 1
Output to 4.

The data output circuit 14 outputs the reproduction data D.
1 is sequentially output to the data bus DBUS at a predetermined timing.

Further, at this time, the demodulation circuit 10 executes error detection processing of the reproduction data D1, and the write control circuit 16 outputs a write request signal RE to the memory circuit 18 based on the detection result.

As a result, the digital audio tape recorder 1 selectively stores the error-free audio data of the reproduction data D1 in the memory circuit 18.

At this time, the block address detection circuit 20
Detects the block address included in the reproduction data D1. The address generation circuit 22 generates address data based on the block address detection result of the block address detection circuit 20 and the frame address of the reproduction data D1 and outputs it to the address bus ABUS.

The memory circuit 18 receives the write request signal RE.
In response to this, the reproduction data D1 is sequentially stored in a predetermined area based on the address data output to the address bus ABUS, thereby selectively storing error-free audio data.

The output circuit 26 sequentially reads out and outputs the audio data stored in the memory circuit 18 in a predetermined order, thereby deinterleaving the audio data and outputting it. The digital-analog conversion circuit (D / A) 28 sequentially converts the output data of the output circuit 26 into an analog signal and outputs the analog signal, whereby the digital audio tape recorder 1 reproduces the digital audio signal to convert it into an analog signal. It is designed to output in the format.

The system control circuit 30 controls the overall operation of the digital audio tape recorder 1 and inputs / outputs predetermined control data SBDT from / to the input / output circuit 32, thereby operating the reproduction signal processing system. Switch. Therefore, in the digital audio tape recorder 1, the demodulation circuit 10 to the input / output circuit 32 are integrated into an integrated circuit.

Here, as shown in FIG. 2, the input / output circuit 32
Is a reference signal S output from a predetermined reference signal generating circuit.
Control data SBDT (FIG. 2 (C)) is input / output to / from the system control circuit 30 at a cycle synchronized with BSY (FIG. 2 (A)). Further, at this time, the input / output circuit 32 and the system control circuit 30 input / output the control data SBDT in synchronization with the reference signal EXCK (FIG. 2 (B)), and the control data SBDT is composed of 4 bits as one word. It is designed to be done.

Here, the input / output circuit 32 reads data such as servo information and subcode from the memory circuit 18, and when the reference signal SBSY rises, the data is assigned to 32 words of data and output. In response to this, the system control circuit 30 controls the period during which the data is output.
The data output from the input / output circuit 32 is sequentially fetched.

As a result, in the digital audio tape recorder 1, the sub-code data and the like accumulated in the memory circuit 18 are displayed on the display device or the like as necessary to improve the usability.

On the other hand, the system control circuit 30 outputs the control data for setting the operation mode of the reproduction system during the period of the following 33 words to 40 words, and the input / output circuit 32 responds to this by outputting the control data. The control data is sequentially fetched. Thus, the input / output circuit 32 switches the operation of the entire reproducing system based on the control data.

At this time, the system control circuit 30 transmits the servo state setting data (represented by symbols X and Y) in the first 2 bits as the data of the 35th word, and then the subsequent 2 bits.
The bit transmits data (represented by symbols S1 / S2) relating to the reproduction of the subcode data. That is, when the system control circuit 30 sets 2-bit data relating to the reproduction of the subcode data in response to the user's operation and reproduces the subcode data for both the first and second recording areas SW1 and SW2, The bit is set to "00".

On the other hand, when the system control circuit 30 reproduces the subcode data from the first or second recording area SW1 or SW2, the bit is set to "1".
Set to "0" or "01". Further, when reproducing subcode data from the second recording area SW2 for the recording track of B channel among the recording tracks of AB channel, the bit is set to "00".

In response to this, the input / output circuit 32 outputs the switching signal S1 to the sub-code processing circuit 36 based on the data relating to the reproduction of the sub-code data, thereby switching the operation of the sub-code processing circuit 36. ..
Here, the subcode processing circuit 36, based on the block address detected by the block address detection circuit 20,
When the block address has a value of "0" to "7", the first
The control signal is output to the write control circuit 16 by determining that it is the subcode of the recording area SW1.

On the other hand, when the block address has a value of "8" to "F", it is judged as a subcode of the second recording area SW2 and a control signal is output to the write control circuit 16. Further, similarly, the sub code processing circuit 36
For the recording track of the channel, the second recording area S
When W2 is detected, a control signal is output to the write control circuit 16.

In response to this, the write control circuit 16
Regarding the subcode data in the reproduction data D1,
The write request signal RE is selectively output based on the control signal output from the subcode processing circuit 36. As a result, in the digital audio tape recorder 1, the subcode data reproduced from the first and / or second recording areas is selectively stored in the memory circuit 18 according to the user's designation.

Therefore, in the NT servo, even when the magnetic heads 6A and 6B are scanned so as to cross the recording track, it is possible to reproduce the data of subcodes which are successively continuous in the order of the recording track.

Thus, the subcode data selectively stored in the memory circuit 18 is sequentially output to the system control circuit 30 via the above-mentioned input / output circuit 32, so that in the digital audio tape recorder 1, The subcode can be used to perform edit processing based on the data, and the usability can be improved.

(2) Operation of the Embodiment In the above configuration, the reproduction signal S1 output from the magnetic heads 6A and 6B is output to the demodulation circuit 10 via the reproduction amplification circuit 8 and demodulated into reproduction data D1 here. To be done.
The reproduction data D1 is output to the data bus DBUS via the data output circuit 14 and is selectively stored in the memory circuit 18 based on the error detection result.

The audio data stored in the memory circuit 18 is deinterleaved by being sequentially read in a predetermined order, and then converted into an analog signal by the digital analog conversion circuit 28, whereby the digital audio tape recorder. In 1, NT
A digital audio signal can be reproduced by using a servo method.

On the other hand, in the sub-code data of the reproduction data D1, the block address is detected by the sub-code processing circuit 36, and the recording areas SW1 and SW2 of the sub-code data are detected based on the detection result.
Is detected. As a result, the write request signal RE is output from the write control circuit 16 at the timing when the data of the subcode of the area SW1 or SW2 designated via the system control circuit 30 is output to the data bus DBUS, and the data of the subcode is output. Is a memory circuit 18 selectively
Accumulated in.

As a result, in the memory circuit 18, N
Even in the case of the T-servo, the data of subcodes that are successively continuous in the order of recording tracks can be accumulated, and the data of the subcodes can be output to the system control circuit 30 via the input / output circuit 32 to generate the digital audio tape recorder. 1
The usability of can be improved.

(3) Effects of the Embodiments According to the above configuration, the subcode data is selectively fetched in accordance with the recording area, so that even in the case of the NT servo, the subcodes are successively consecutive in the recording track order. Can be reproduced and the usability of the digital audio tape recorder 1 can be improved.

(4) Other Embodiments In the above-mentioned embodiments, the case where the digital audio signal is reproduced by the NT servo has been described, but the present invention is not limited to this, and the point is that each magnetic head performs the recording track. The present invention can be widely applied to the case of scanning so as to traverse, and can be widely applied to the case of, for example, variable speed reproduction.

[0045]

As described above, according to the present invention, by selectively capturing the recording information according to the recording area, even when the magnetic head scans across the recording track, it is sequentially recorded in the order of the recording tracks. It is possible to reproduce the recorded information of continuous digital audio signals, and to obtain a magnetic reproducing device with improved usability.

[Brief description of drawings]

FIG. 1 is a block diagram showing a digital audio tape recorder according to an embodiment of the present invention.

FIG. 2 is a signal waveform diagram for explaining control data transmission.

FIG. 3 is a schematic diagram showing a scanning track of a magnetic head in the case of NT servo.

[Explanation of symbols]

1 ... Digital audio tape recorder, 2 ... Magnetic tape, 14 ... Data output circuit, 16 ... Write control circuit, 18 ... Memory circuit, 20 ... Block address detection circuit, 32 ... Input / output circuit, 36 ...... Subcode processing circuit.

Claims (1)

Claim: What is claimed is: 1. A magnetic drum is driven and a rotary drum is driven so that a corresponding magnetic head scans a plurality of recording tracks that are sequentially formed on the magnetic tape obliquely. Then, in the magnetic reproducing apparatus for reproducing and outputting the digital audio signal recorded on the magnetic tape by selectively taking in the reproduction signal output from the magnetic head, the magnetic tape is the longitudinal direction of the recording track. An audio signal recording area and a plurality of recording information recording areas, the digital audio signal is recorded in the audio signal recording area, and the recording information of the digital audio signal is recorded in each of the recording information recording areas. The magnetic reproducing apparatus selects a predetermined recording information recording area from the plurality of recording information recording areas. A magnetic reproducing apparatus characterized by selecting and reproducing the recorded information from the recorded information recording area and outputting the recorded information together with the digital audio signal.