JPH0192945A - Recording and reproducing control system - Google Patents

Abstract

PURPOSE:To record/reproduce required data accurately by reproducing a sub- code data through the partial rewinding of a loaded tape in starting the recording/reproduction and comparing it with a sub-code data stored previously in a memory section so as to attain desired recording and reproduction. CONSTITUTION:A reproduction mode is set by the depression of a proper key in a mode setting section 18A and it is commanded to a control section 18. Suppose that the system is in the unloading state, the tape is loaded to wind the tape onto a drum. Then the tape is wound slightly and the signal is reproduced to read a required sub-code. When the content of the read sub-code is coincident with the content stored in the memory section 30, the suppression of a mute section 16 by the control section 18 is released and the substantial reproduction is transited. Thus, the tip of the tape is detected accurately to apply the required recording/reproduction.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a recording/playback control system, and in particular, in so-called R-DAT, when an unloaded tape is loaded, The present invention relates to a recording and reproducing control method that allows recording and reproducing to be performed from a starting point.

[Prior Art] FIG. 2 is a block diagram showing a conventional recording/reproducing control system. In this FIG. 2, the head section (20) is DAT
The information from the original tape is taken in and sent to the next stage amplifier section (
Add to 20＾). The output from this amplifier section (20^) is converted into corresponding digital information by a data demodulation section (21), and then stored in the first RAM section (22). The data demodulation section (21) forms a loop together with the PLL section (21^), and is configured to extract a synchronization signal of the digital information. Digital information in this first RAM section (22) is applied to a signal processing section (23). Here, the signal processing section (23) performs necessary processing on the digital information and then stores it in the second RAM section (24).
).

Further, the ATF synchronization signal detection section (23^) detects an ATF synchronization signal based on the ATF synchronization signal from the signal processing section (23) regarding the digital information transmitted from the data demodulation section (21). After performing necessary sample and hold operations on the signal, it is made into a drive signal for the capstan motor (M4).

The digital information stored in the second RAM section (24) is separated into so-called PCM data and subcode data, and one PCM data is divided into the D/A converter (25) and the mute section ( 26) to the output section (27). Here, the mute section (26) is connected to the signal processing section (23), and for example, when the error in the information taken in from the head section (20) (II) exceeds a certain predetermined level, a message to that effect is sent. In response to the instruction, the audio output is suppressed.The other subcode data is extracted by the subcode detection section (29) and then sent to the control section (28) consisting of an appropriate microcomputer. This control unit (28) is equipped with a mode setting unit (28^), and also has settings for reels,
Various motors (Ml) to (M4) for the drum, loading, capstan, etc. are controlled by the control section (28).

In the conventional example described above, it is assumed that the tape is currently in an unloading state and that the mode setting section (Z8A) issues a necessary command to the control section (28) in order to perform a recording or reproducing operation. The tape shifts to a loading state in response to the above command, and is wound around the drum to perform desired recording/reproducing operations. By the way, in order to perform such recording/playback operations accurately, it is necessary to accurately detect the leading edge of the tape, but it is necessary to repeatedly perform the unloading and loading operations as described above. In such cases, it is extremely difficult to find the previous stop position of the tape, that is, to accurately locate the beginning of the tape, because the movement/stopping of the tape is accompanied by inertia.

[Problems to be Solved by the Invention] The conventional recording/playback control system is configured as described above, and when repeatedly unloading and loading a tape, the leading edge of the tape is used as the starting point of the operation. There was a problem that it could not be detected accurately.

This invention was made to solve the above-mentioned problems, and its purpose is to provide a recording/playback control system that can accurately detect the leading edge of a tape and accurately perform necessary recording/playback. shall be.

[Means for Solving the Problems] The recording and playback control system according to the present invention includes: a head section that captures digital audio data from a tape; an amplifier section that amplifies the audio data captured by the head section; a data demodulation section that demodulates the amplified audio data as required; a PLL section configured in a loop together with the data demodulation section; a first RAM section that stores the demodulated audio data; and the first RAM.
a signal processing unit that performs necessary processing on audio data from the data demodulation unit, receives audio data from the data demodulation unit, and outputs an ATF synchronization signal for tracking based on a predetermined condition signal from the signal processing unit; an ATF synchronization signal detection unit that stores audio data from the signal processing unit; a second RAM unit that stores audio data from the signal processing unit;
a D/A converter that converts audio data from the D/A converter into corresponding analog data; a mute section that reduces the level of the analog data from the D/A converter; and an output connected to the subsequent stage of the mute section. a subcode detection unit that extracts subcode data from the audio data in the second RAM unit; a control unit that controls the overall operation;
The control unit includes a mode setting unit that instructs the control unit to select a desired operation mode, and a memory unit attached to the control unit.

[Operation] In the present invention, when starting a recording/reproducing operation, the loaded tape is partially rewound to reproduce the subcode data, and the subcode data stored previously in the memory section is A comparison is made with the existing subcode data, and a desired recording/reproduction operation is performed depending on the result of the comparison.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
FIG. 1 is a block diagram showing a recording/reproducing control system according to an embodiment of the present invention. In this FIG. 1, the head part (
10) takes in information from the DAT tape and adds it to the next stage amplifier section (10^). This amplifier section (10
The output from the first RAM unit (11) is demodulated by the data demodulator (11) and converted into corresponding digital information.
2). The data demodulation section (11) is a PLL
A loop is formed with the section (11^) to extract a synchronization signal of the digital information. This first
The digital information in the RAM section (12) is processed by the signal processing section (1
3) will be added. Here, in the signal processing section (13), the digital information is subjected to necessary processing and then stored in the second RAM section (14). Also, ATF
In the synchronization signal detection section (13^), the data demodulation section (
Regarding the digital information transmitted from the signal processor (11), an ATF synchronization signal is detected based on the ATF sync signal from the signal processing unit (13), and after performing necessary sample and hold operations on this signal, the capstan motor (M
4) is used as a drive signal.

The digital information stored in the second RAM section (14) is separated into so-called PCM data and subcode data, and one PCM data is sent to the D/A converter (15) and the mute section h ( 16) to the output section (17). Here, the mute section (16) is connected to the signal processing section (13), and for example, when the error in the information taken in from the head section (10) side exceeds a certain predetermined level, an instruction to that effect is issued. In response to this, audio output is suppressed. Further, the other subcode data is extracted by the subcode detection section (19), and then the control section (18) consisting of a suitable microcomputer is used.
).

Note that this control section (18) can also control the mute section (16) to suppress the audio output, if necessary. A mode setting section (18^) is attached to this control section (18), and various motors (Ml) to (M4) for reel, drum, loading, capstan, etc. It is controlled by a control section (18). Furthermore, a memory section (30) and a switch section (30^) are provided in series between the control section (18) and the subcode detection section (19).

Next, the operation of the above embodiment will be explained.

(A) First, the recording operation is performed as follows.

(1) The recording mode is set by pressing an appropriate key in the mode setting section (18^), and this is instructed to the control section (18).

(2) Assuming that the device is currently in the unloading state, the tape is loaded and wound around the drum.

(3) A slight tape rewind is performed.

(4) A playback operation is performed and the required subcode is read.

(5) The content of the read subcode is stored in the memory section (3
0), the recording mute state (the tape stops running and the drum continues rotating) waits for a recording instruction.

(B) Next, the reproduction operation is performed as follows.

(1) The reproduction mode is set by pressing down an appropriate key in the mode setting section (18^), and this is instructed to the control section (18).

(2) Assuming that the drum is currently in an unloading state, the tape is loaded and wound around the drum.

(3) A slight tape rewind is performed.

(4) A playback operation is performed and the required subcode is read.

(5) The content of the read subcode is stored in the memory section (30
), the control unit (
18) is released from the suppressing operation of the mute section (16), and a full-scale reproduction operation begins.

After (C)R, the stopping operation is performed as follows.

(1) During the playback/recording operation, by pressing an appropriate key in the mode setting section (18^), the stop mode is set and the control section (18) is instructed to perform the tape unloading operation. be done.

(2) The frame ID in the PCM-ID, the absolute time in the subcode, etc. are stored in the memory section (30).

(3) A tape unloading operation is performed.

In the above embodiments, the memory section and the switch section are shown as being separate from the control section, but the present invention is not limited to this, and they may be built into the control section, for example. There is no.

[Effects of the Invention] As explained above, the recording and reproducing method according to the present invention includes a head section that captures digital audio data from a tape, and a head section that captures digital audio data from a tape.
an amplifier section that amplifies data; a data demodulation section that demodulates the amplified audio data in a required manner; a PLL section that is configured in a loop together with the data demodulation section; and a first RAM that stores the demodulated audio data.
a signal processing section that performs necessary processing on the audio data from the first RAM section; a signal processing section that receives the audio data from the data demodulation section and performs tracking based on a predetermined condition signal from the signal processing section; A.T.
an ATF synchronization signal detection section that outputs an F synchronization signal; and a second RAM that stores audio data from the signal processing section.
a D/A converter for converting audio data from the second RAM section into corresponding analog data;
a mute section that reduces the level of analog data from the A conversion section; an output section connected to a subsequent stage of the mute section;
a subcode detection unit that extracts subcode data from the audio data in the second RAM unit; a control unit that controls the overall operation; a mode setting unit that instructs the control unit to select a desired operation mode; and the control unit. When starting a recording/playback operation, the loaded tape is partially rewound to play back the subcode data, and the subcode data is stored in the memory section. A comparison is made with previously stored subcode data, and the desired recording/playback operation is performed depending on the result of the comparison, so the tape is used as the starting point for the operation. This has the effect that the leading end can be detected accurately and necessary recording and reproduction can be performed accurately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a recording and reproducing control method according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional recording and reproducing control method. (10) is the head part, (10^) is the amplifier part, ri11)
is the data demodulation section, (11^) is the PLL section, (12) is the first RAM section, (13) is the signal processing section, (13^) is the A
TF synchronization signal detection section, (14) is the second RAM section, (15)
) is the D/A conversion section, (16) is the mute section, (1)) is the output section, (18) is the control section, (18^) is the mode setting section, (19) is the subcode detection section, (30 ) is the memory part,
(30^) is the switch part, and (Ml) to (M4) are the motors. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) a head section that captures digital audio data from the tape; an amplifier section that amplifies the audio data captured by the head section; a data demodulation section that performs necessary demodulation on the amplified audio data; a PLL section configured in a loop together with a data demodulation section; a first RA that stores the demodulated audio data;
a signal processing unit that performs necessary processing on the audio data from the first RAM unit; a signal processing unit that receives the audio data from the data demodulation unit and performs tracking based on a predetermined condition signal from the signal processing unit; an ATF synchronization signal detection section that outputs an ATF synchronization signal; a second RAM section that stores audio data from the signal processing section; and a D/A that converts the audio data from the second RAM section into corresponding analog data. a conversion section, a mute section that reduces the level of analog data from the D/A conversion section, an output section connected to a subsequent stage of the mute section, and the second R
a subcode detection unit that extracts subcode data from the audio data of the AM section; a control unit that controls the overall operation; a mode setting unit that instructs the control unit to select a desired operation mode; A recording/playback control system comprising: an attached memory unit; when starting a recording/playback operation, a loaded tape is partially rewound to play back subcode data; A recording/reproduction control system in which a comparison is made with subcode data previously stored in the section, and a desired recording/reproduction operation is performed depending on the result of the comparison.