JPH0554552A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To process independently a first and a second input data by switching the first and the second input data in a unit of prescribed words referring a unit of processing an error correction and processing/recording them at a double speed. CONSTITUTION:After an error correction code taking a number of words as reference is generated in a unit of prescribed blocks with respect to the input data continuous of the prescribed words, this code is recorded on a recording track formed obliquely successively on a magnetic tape 26 with the input data in a unit of blocks. At this tie, to an interval for inputting the input data for the unit of prescribed blocks, a recording track forming interval is set to 1/2 of it and an error correction code generating speed is set to 2 times it, a first and a second input data DV1, DA in stead of the input data are switched to be inputted by the number of words taking this interval as reference, these are recorded on the prescribed area of the recording track with an error detection correction code. Thus, only an audio signal and a still image are reproduced.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. BACKGROUND OF THE INVENTION Field of the Invention Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 and 2) Action (FIGS. 1 and 2) Example (1) Configuration of Example (FIGS. 1 to 1) FIG. 5) (2) Operation of the embodiment (3) Effects of the embodiment (4) Other embodiments Effects of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device, and is particularly suitable for application when a video signal or the like is recorded using a digital audio tape recorder.

[0003]

2. Description of the Related Art Conventionally, there is a magnetic recording device of this type which can record and reproduce a digital audio signal (hereinafter referred to as a digital audio tape recorder).

That is, in a digital audio tape recorder, an audio signal which is an analog signal is converted into audio data having a predetermined bit length at a predetermined sampling period and then interleaved at predetermined intervals.

Furthermore, in the digital audio tape recorder, the interleaved audio data is recorded with an error detection and correction code and then recorded together with recording information such as a program time.

As a result, the digital audio tape recorder can record high-quality audio signals at high density.

[0007]

By the way, it would be convenient if a digital audio tape recorder of this kind could be used to record image data such as still images in addition to audio signals.

At this time, if it is possible to reproduce only the audio signal or only the still image if necessary,
It is considered to be convenient because it can improve the usability of the digital audio tape recorder.

Even when the image data is also recorded in this way, it is considered convenient if only the image data can be rerecorded or only the audio data can be rerecorded as necessary.

The present invention has been made in consideration of the above points, and an object thereof is to propose a magnetic recording apparatus capable of recording image data together with audio data and improving usability.

[0011]

In order to solve such a problem, according to the present invention, after an error correction code based on the number of words is generated in a predetermined block unit with respect to continuous input data in a predetermined word. In the magnetic recording apparatus 1 for recording input data and error correction codes in a block unit on a recording track formed obliquely on the magnetic tape 26, a recording track is input for a period during which input data in a predetermined block unit is input. TRA1, TRB1, TRA2,
The period required for forming TRB2, ... Is set to 1/2, the generation rate of the error correction code is set to 2 times, and the input data is set based on the period in which the input data of a predetermined block is input. Instead of the first and second input data DV
1 and DA are switched and input by the number of words, and the first and second input data DV1 and DA are recorded together with the error detection / correction code together with the recording tracks TRA1, TRB1, TRA.
2, TRB2, ... is recorded in a predetermined area.

[0012]

The first and second input data DV1 and DA are switched by the number of words and input instead of the input data based on the period during which the input data of the predetermined block is input. The input data DV1 and DA, together with the error detection and correction code, are recorded on the recording tracks TRA1 and TRB.
1, TRA2, TRB2, ... If recorded in predetermined areas, the first and second input data DV1 and DA, respectively.
, An error correction code can be independently generated and can be recorded in a predetermined area of each recording track. Therefore, only the audio signal or the still image can be reproduced, and only the image data can be re-recorded or only the audio data can be re-recorded.

[0013]

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 a recording / reproducing apparatus as a whole, which records audio data and image data using a digital audio tape recorder 2.

That is, the recording / reproducing apparatus 1 uses the analog digital conversion circuit (A / D) 4 to record the video signal SV during recording.
Where the video signal SV is converted into a 16-bit digital signal DV having a predetermined sampling frequency.

On the other hand, the digital-analog conversion circuit (D / A) 6 converts the image data DV output from the image data processing circuit 8 into an analog signal and outputs it during reproduction. As a result, the recording / reproducing apparatus 1 can record and reproduce the video signal SV via the analog digital conversion circuit 4 and the digital analog conversion circuit 6.

The image data processing circuit 8 outputs image data DV output from the analog digital conversion circuit 4 during recording.
Are stored in a built-in frame memory circuit and then sequentially output at a predetermined timing. As a result, the image data processing circuit 8 uses the frame memory circuit to generate image data DV1 of a still image and outputs it to the data processing circuit 10 at a predetermined transmission speed.

At this time, as shown in FIG. 2, the image data processing circuit 8 switches the operation in response to the mode switching signal SM, and stops the processing of the image data DV in the mode 0 of the 4-channel mode.

Further, the image data processing circuit 8 outputs the image data DV1 in the mode 1 of the 4-channel mode.
The image data DV1 is output in mode 2 of the 4-channel mode while outputting at a transmission rate of 56 [kbps] (that is, at 1/2 of the transmission rate for inputting / outputting audio data in a normal digital audio tape recorder). Output at twice the transmission speed of mode 1.

Further, the image data processing circuit 8 outputs the image data DV1 at a transmission rate three times as high as that of the mode 1 in the mode 3 of the four channel mode, and four times as much as the transmission of mode 1 in the mode 4 of the four channel mode. The image data DV1 is output at a speed.

On the other hand, in mode 0 of the SP double speed mode, the image data processing circuit 8 stops the processing of the image data DV, and in mode 1 of the SP double speed mode, 7
The image data DV1 is output at a transmission rate of 68 [kbps].

Further, the image data processing circuit 8 is
In mode 2 of the double speed mode, image data DV1 is output at a transmission speed twice as high as that of mode 1, and in mode 3 and mode 4 of the SP double speed mode, image data DV1 is transmitted at a transmission speed three and four times that of mode 1, respectively. Output.

Further, at this time, mode 2 of the SP double speed mode
In mode 4, the image data processing circuit 8 updates the contents of the frame memory circuit at a predetermined cycle in response to the mode switching signal SM, and the captured image data D
V is subjected to data compression processing and output, and thereby, image data DV1 of a moving image is output instead of a still image as necessary.

In mode 4 of the SP double speed mode,
The image data processing circuit 8 takes in audio data in addition to the image data DV in a memory circuit and processes it, so that not only a moving image but also an audio signal can be recorded.

On the other hand, at the time of reproduction, the image data processing circuit 8 switches the operation in response to the mode switching signal SM as at the time of recording, and executes the processing opposite to that at the time of recording, thereby the data processing circuit The image data DV1 output from 10 is converted into the original format and output. As a result, in the recording / reproducing apparatus 1, the image data DV is converted into a format suitable for recording and recording / reproducing is performed.

Analog digital conversion circuit (A / D) 1
In the recording mode 4, the input audio signal SA is converted into a 12-bit digital signal at a sampling frequency of 32 [kHz] and is output in the 4-channel mode during recording.
In the P-speed mode, the input audio signal SA
Is converted into a 16-bit digital signal at a sampling frequency of 48 [kHz]. At this time, the analog digital conversion circuit 12 converts the 4-channel input audio signal input to the analog digital conversion circuit 12 into a digital signal and outputs it in mode 0 of the 4-channel mode and the SP double speed mode, respectively. In mode 1, three channels are converted into digital signals and output.

On the other hand, in mode 2 and mode 3, the analog digital conversion circuit 12 converts the input audio signals of 2 channels and 1 channel of the input audio signals of 4 channels into digital signals and outputs them. On the other hand, the digital-analog conversion circuit 14 converts the digital audio signal output from the data processing circuit 10 into an analog signal and outputs it during reproduction.

At this time, the digital analog conversion circuit 14
Switches the operation according to the operation mode. In mode 0, the 4-channel digital audio signal output from the data processing circuit 10 is converted into an analog signal and output, whereas in mode 1, the 3-channel signal is output. Converts digital audio signals to analog signals and outputs them. Similarly, in modes 2 and 3, the digital-analog conversion circuit 14 converts the digital audio signals of 2 channels and 1 channel into analog signals and outputs them.

Thus, in the recording / reproducing apparatus 1, the audio signal SA can be recorded / reproduced via the analog digital conversion circuit 12 and the digital analog conversion circuit 14.

At the time of recording, the data processing circuit 10 takes in the image data DV1 and the audio data DA and outputs them to the digital audio tape recorder 2 in a predetermined unit. That is, the data processing circuit 10 operates in synchronization with the digital audio tape recorder 2 and time-compresses the digital audio signal DA to double the transmission rate. At this time, the data processing circuit 10 causes the digital audio tape recorder 2 to perform an interleave processing cycle (in this case, 15 [mm sec] which is 1/2 of the normal processing cycle).
The image data and the digital audio signal DA are processed in units of (period).

As a result, the data processing circuit 10 causes the digital audio signal DA and the image data DV to be switched so that the audio data and / or the image data compressed in the time axis is switched in units of 15 [mm sec] cycle according to the mode. Is converted into a digital signal SD and output.

That is, in the mode 0, the data processing circuit 10 outputs the time-axis-compressed digital audio signals of the first and third channels among the digital audio signals DA of four channels output from the analog digital conversion circuit 12 (symbols are respectively A, C or L1, R1
For 15 [mm sec], alternately output in synchronism with a predetermined clock signal LCK (which is twice the normal frequency of 96 [kHz]) and then continues for 15 [mm sec]. In a period,
Similarly, the digital audio signals of the second and fourth channels (represented by symbols B and D or L2 and R2, respectively) are output. As a result, the data processing circuit 10 alternately switches the audio data in word units in a cycle in which the digital audio tape recorder 2 interleaves, and records the digital audio signal of each channel in a predetermined area of each recording track. Has been done.

In mode 1, the data processing circuit 10 further includes time-compressed first and third digital audio signals DA of three channels output from the analog digital conversion circuit 12 for a period of 15 [mm sec]. The channel digital audio signal is alternately switched in synchronization with the clock signal LCK in word units and output. Further, the data processing circuit 10 supplies the clock signal LC in word units to the remaining channel digital signal SD and time-axis-compressed image data for the following 15 [mm sec] period.
Alternately output in synchronism with K.

Further, in mode 2, the image data D
V1 and the time-axis compressed digital audio signal of the first channel are alternately switched in synchronization with the clock signal LCK in word units for a period of 15 [mm sec], and then output for a subsequent 15 [mm sec] period. Then, the remaining image data and the digital audio signal are alternately switched in a word unit in synchronization with the clock signal LCK and output.

On the other hand, in the mode 3, the data processing circuit 10 sets the image data DV1 for 30 [mm sec] for the first 10 [mm sec] for the image data for 15 [mm sec].
After the time axis is expanded during the period of, the time axis expanded image data and the time axis compressed digital audio signal of one channel are alternately switched in word units in synchronization with the clock signal LCK for the first 15 [mm sec] period. Switch and output. During the subsequent 15 [mm sec] period, the data processing circuit 10 outputs the remaining 20 [mm sec] image data by 15 [mm se].
Allocate to the period [c] and output.

On the other hand, in mode 4, the data processing circuit 10 expands the input image data DV1 on the time axis, and outputs the image data in word units in synchronization with the clock signal LCK. As a result, the recording / reproducing apparatus 1 outputs the digital signal to the digital audio tape recorder 2 at a transmission speed twice as high as a normal speed for processing, and at this time, depending on the mode, the normal interleave processing cycle is performed. In a cycle of 1/2, predetermined image data and / or digital audio signals are switched in a word unit in synchronization with the clock signal LCK and output.

On the other hand, during reproduction, the data processing circuit 10
The operation is switched according to the mode switching signal SM, and the data processing reverse to that at the time of recording is executed for each mode. As a result, the recording / reproducing apparatus 1 outputs the digital signal reproduced by the digital audio tape recorder 2 to the image data processing circuit 8 and the digital / analog conversion circuit 14 for each mode, and if necessary, the image data and the digital signal. It is designed to reproduce audio signals.

In the digital audio tape recorder 2, a predetermined reference signal is output to the analog digital conversion circuits 4 and 12, the digital analog conversion circuits 6 and 14, the image data processing circuit 8 and the data processing circuit 10, thereby recording the data. The reproducing apparatus 1 as a whole can operate in synchronization. Here, the system control circuit 20
Is a digital signal processing circuit 2 in response to the operation of an operator.
2. A mode switching signal SM is output to the mechanical drive circuit 24, the data processing circuit 10 and the image data processing circuit 8 to switch the operation of the entire recording / reproducing apparatus 1.

In response to this, the mechanical drive circuit 24 drives the capstan motor to drive the magnetic tape 26 at a predetermined traveling speed and drives the drum motor to rotate the rotary drum 28 at a predetermined speed. .. At this time, in the digital audio tape recorder 2, the diameter 15
Magnetic heads 30A and 30B are arranged on a rotating drum 28 of [mm] at angular intervals of 180 degrees, and the magnetic tape 26 is wound around the rotating drum 28 at a winding angle of 180 degrees.

In this state, in the normal mode, the mechanical drive circuit 24 rotationally drives the rotary drum 28 in a cycle of 30 [mm sec] and drives the magnetic tape 26 at a predetermined speed. As a result, in the digital audio tape recorder 2, in the normal mode, recording tracks are sequentially formed with the standardized format of the digital audio tape recorder 2.

On the other hand, 4 channel mode and SP
In the double speed mode, the mechanical drive circuit 24 drives the drum motor and the capstan motor at a speed twice that of the normal mode.

As a result, in the digital audio tape recorder 2, a pair of recording tracks can be sequentially formed in a cycle of 15 [mm sec] in the 4-channel mode and the SP double speed mode, and the recording track forming cycle is normal. It is designed to be half the mode.

On the other hand, during reproduction, the mechanical drive circuit 24
Drives the drum motor and the capstan motor in the same manner as during recording. At this time, the mechanical drive circuit 24 controls the rotational phase of the capstan motor on the basis of a predetermined tracking error signal, thereby controlling the tracking of the magnetic tape 26.

In the normal mode, the digital signal processing circuit 22 accumulates the sequentially input digital signals SD in a predetermined area of the memory circuit 23 for each predetermined unit to interleave the digital signal SD. Further, the digital signal processing circuit 22 generates an error correction code in the unit of the interleave processing, converts the digital signal SD and the error correction code into a recording signal, and outputs the recording signal to the magnetic heads 30A and 30B.

As a result, in the digital audio tape recorder 2, the digital audio tape recorder 2 is standardized by inputting the digital audio signal in place of the digital signal SD to the digital signal processing circuit 22 in the normal mode. The format allows the digital audio signal to be recorded.

At this time, the digital signal processing circuit 22 generates recording information (that is, sub-code data) such as program time and absolute time in accordance with the control data output from the system control circuit 20 and predetermined. Is output to the magnetic heads 30A and 30B.
Further, at this time, a predetermined pilot signal is sent to the magnetic heads 30A and 30B before and after the sub-code data is output.
, And thereby sequentially forms the recording tracks with the standardized format of the digital audio tape recorder.

On the other hand, during reproduction in the normal mode, the digital signal processing circuit 22 operates the magnetic heads 30A and 30A.
The reproduction signal output from B is demodulated into reproduction data. Further, the digital signal processing circuit 22 sequentially stores the reproduced data in the memory circuit 23, performs error correction processing, and then sequentially outputs the reproduced data in a predetermined order, thereby executing deinterleave processing of the reproduced data.

As a result, the digital audio tape recorder 2 can reproduce a magnetic tape recorded by using an ordinary digital audio tape recorder and output a digital audio signal. On the other hand, when recording in the 4-channel mode and SP double speed mode, the digital signal processing circuit 22
It operates at twice the operating speed of normal mode.

That is, the digital signal processing circuit 22 is
After sequentially capturing the digital signals SA input at twice the transmission speed of the normal mode and performing interleave processing,
An error correction code is generated and output to the magnetic heads 30A and 30B. At this time, the digital signal processing circuit 22 switches the interleave processing cycle in synchronization with the switching of the digital signal SD.

As a result, the digital signal processing circuit 2 concerned
In No. 2, an error correction code is individually generated for each channel digital audio signal or image data for each mode, and the error correction code is recorded in a predetermined area of each recording track. As a result, in the digital audio tape recorder 2,
In the mode 2, after the error correction code is generated for each of the image data DV1 and the digital audio signal DA, the image data DV1 and the digital audio signal DA can be divided and recorded in predetermined areas of the recording track.

That is, as shown in FIG. 3, in this type of digital audio tape recorder, a pair of recording tracks T are used in units of interleave processing.
Digital signals are assigned to RA1 and TRB1, TRA2 and TRB2, ... And recorded.

At this time, in the digital audio tape recorder 2, the TR between the two recording tracks.
Interleaving processing is performed by A1 and TRB1, TRA2 and TRB2, and the input data that is continuously input is divided into even-numbered and odd-numbered data areas and recorded.

Therefore, as in the mode 2 of this embodiment,
By alternately inputting the digital audio signal and the image data and sequentially processing the digital audio signal and the image data, the image data and the digital audio signal can be individually recorded in a predetermined area of each recording track. ..

Accordingly, in the reproduction mode, the digital audio tape recorder 2 selects the reproduction signal of the digital audio signal or the image data by taking in the reproduction signal at the timing when the magnetic heads 30A and 30B scan each recording area. Can be taken into account.

Further, in the digital audio tape recorder 2 of this type, the recording tracks TRA1, TRB1 ,.
An error correction code is generated for each.

Therefore, according to the mode 2 of this embodiment, the digital audio signal or the image data can be individually subjected to the error detection and correction processing with respect to the selectively fetched reproduction data, whereby the digital audio signal or the image data can be processed. It can be selectively played.

Further, reproduction data can be subjected to error correction processing for each recording track, and image data or digital audio signals can be independently interpolated. If necessary, a digital audio tape recorder equipped with a magnetic head for read-ahead can be used to simultaneously perform a reproducing operation and a recording operation, thereby selectively re-recording only a digital audio signal or image data. it can.

Thus, in the mode 0, the digital signal processing circuit 22 generates an error correction code for each channel with respect to the digital audio signal synchronized with the clock signal LCK in word units, and then the digital audio signal and the error correction code are generated. The code is recorded in a predetermined area of each recording track for each channel.

On the other hand, the digital signal processing circuit 22
In mode 1, the image data is recorded in place of the digital audio signal of the fourth channel in mode 0, whereas in mode 2, the image data is recorded in place of the third and fourth digital audio signals. To do.

Further, in mode 3, image data can be recorded in place of the second to fourth digital audio signals, and in mode 4, only image data can be recorded. On the other hand, at the time of reproduction in the 4-channel mode and SP double speed mode, the digital signal processing circuit 22 operates at twice the normal operation speed as at the time of recording, and reproduces the reproduction signals output from the magnetic heads 30A and 30B. To process.

At this time, the digital signal processing circuit 22
As shown in FIG. 4, the reproduced data is sequentially subjected to error detection and correction processing, and then deinterleaved and outputted. At this time, the reproduced data D1 (FIG. 4A) is synchronized with a predetermined clock signal LCK (FIG. 4A). (B)) is output.

As a result, the reproduced data D1 is reproduced by the data processing circuit 10 in two systems of digital signals SDL synchronized with a predetermined clock signal LRCK (having a frequency of 1/2 of the clock signal LCK) (FIG. 4C). And SDR (FIGS. 4 (D) and 4 (E)), and then output to the analog digital conversion circuit 12 or the image data processing circuit 8 as needed.

As a result, as shown in FIG. 5, in the digital audio tape recorder 2, the normal digital audio tape recorder 2 operates in the mode 2.
Four recording tracks are scanned in a period of 30 [mm sec] for scanning one recording track, and the resulting reproduction data D1 (FIG. 5 (A)) is delayed by a period of 30 [mm sec] for digital. The audio signal DA and the image data DV (FIGS. 5B and 5C) can be separated and output.

(2) Operation of the embodiment In the above configuration, the analog digital conversion circuit 12
The 4-channel audio signal input to is in 4 channel mode or SP double speed mode 0,
After being converted into a digital audio signal, it is output to the data processing circuit 10. Here, the 4-channel digital audio signal is a unit in which the digital audio tape recorder 2 performs error correction processing after the transmission speed is doubled on the time axis, and the digital signal processing circuit 22 is switched alternately for each word. Is output to.

In the digital signal processing circuit 22, the digital audio signal is interleaved in units of the error correction processing, and then an error correction code is generated and converted into a recording signal together with the error correction code. As a result, the 4-channel audio signal is recorded in a predetermined area of each recording track for each channel.

On the other hand, in Modes 1 to 4, the video signal SV input to the analog digital conversion circuit 4 is converted into a digital signal and then converted into still image data by the image data processing circuit 8. It In mode 1, the image data of the still image is output to the digital signal processing circuit 22 in place of the first channel of mode 0, whereby the image data DV is sequentially recorded on the magnetic tape.
1 can be recorded.

On the other hand, in mode 2, the image data is output to the digital signal processing circuit 22 in place of the first and second channel digital audio signals of mode 0, whereby the digital audio signal and the image data are sequentially output. It is recorded in the recording track.

At this time, in the mode 2, the image data and the digital audio signal are sequentially switched in the unit of word and in the unit of error correction processing and output to the digital signal processing circuit 22, so that each of the image data and the digital audio signal is output. It is possible to generate an error correction code and to individually record it in a predetermined area of the recording track.

As a result, the image data or the digital audio signal can be independently reproduced, and the image data or the digital audio signal can be rerecorded as necessary.

On the other hand, in mode 3, image data is recorded in place of the digital audio signals of the first to third channels of mode 0, and in mode 4, it is replaced with the digital audio signals of 4 channels of mode 0. Image data is recorded.

(3) Effects of the Embodiments According to the above configuration, the processing speed of the digital audio tape recorder is set to double, and the digital audio tape recorder is used as a reference for the error correction processing. By alternately inputting the digital audio signal and the image data in units of words processed by the audio tape recorder, the image data and the digital audio signal can be processed independently, whereby the image data or the digital audio signal can be selectively processed. The image data or the digital audio signal can be re-recorded as required.

(4) Other Embodiments In the above-described embodiments, the case where the image data and the digital audio signal are alternately switched and input has been described, but the present invention is directed to the case where they are alternately switched and input. Not limited to this, if the switching is performed based on the unit for error correction processing, the image data and the digital audio signal can be independently recorded in a predetermined area of each recording track. For example, switching is performed for each interleave processing unit. You may do it.

[0073]

As described above, according to the present invention, the first and second input data are alternately switched in units of a predetermined word on the basis of the unit of error correction processing, and the processing speed is twice as high as usual. By recording with a recording device that operates at
Further, it is possible to easily obtain the magnetic recording device capable of independently processing the second input data.

[Brief description of drawings]

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

FIG. 2 is a chart for explaining the operation mode.

FIG. 3 is a plan view showing the recording pattern.

FIG. 4 is a signal waveform diagram for explaining the signal processing.

FIG. 5 is a signal waveform diagram showing processing of the reproduced data.

[Explanation of symbols]

1 ... Recording / reproducing device, 2 ... Digital audio tape recorder, 4, 12 ... Analog digital conversion circuit, 6, 14 ... Digital analog conversion circuit, 10 ...
... data processing circuit, 22 ... digital signal processing circuit,
26 ... Magnetic tape.

Claims (1)

[Claims] 1. An input data and an error correction code for each block are generated after an error correction code is generated in a predetermined block unit for input data continuous in a predetermined word with the number of words as a reference. In a magnetic recording apparatus for recording a code on a recording track formed on a magnetic tape in a diagonal manner, the period required to form the recording track is set to 1/2 of the period in which the input data of the predetermined block unit is input. At the same time, the generation rate of the error correction code is set to double, and the first and second words of the number of words are used in place of the input data on the basis of the period in which the input data of the predetermined block is input. The input data is switched and input, and the first and second input data are recorded in a predetermined area of the recording track together with the error detection and correction code. The magnetic recording apparatus.