JPS6316486A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record the recording signals with no break in a shift mode between 1st and 2nd magnetic tapes by recording these recording signals with superposition at a part near the termination of the 1st magnetic tape and the head part of the 2nd magnetic tape respectively. CONSTITUTION:When the drive of the 1st magnetic tape 14 is started, a recording signal switching circuit 8 is switched to the side of the 1st magnetic head 12 and supplies the digital signals to a head amplifier 10 from a near-tape termination information adding circuit 7. Then the digital signals are supplied to both head amplifiers 10 and 11 while the near-tape termination detecting pulse (d) of a high level is supplied from a near-tape termination detecting circuit 4 and in several residual seconds of the tape 14. Thus the same digital signal is recorded with superposition to the 1st and 2nd magnetic tapes 14 and 15. The pulse (d) supplied from the circuit 4 is de-energized after the tape 14 reaches the termination of the tape 14 and stops. Then the circuit 8 supplies the digital signal to the amplifier 11 only.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic recording/reproducing apparatus that can continuously record signals from at least a first magnetic tape to a second magnetic tape.

<Summary of the Invention> The present invention provides a magnetic recording/reproducing device capable of continuously recording recording signals from at least a first magnetic tape to a second magnetic tape, which To provide a magnetic recording and reproducing device configured to be able to record a recording signal overlappingly in the leading part of a magnetic tape, and capable of recording the recording signal without interruption when transferring from a first magnetic tape to a second magnetic tape. It is.

<Prior Art> Conventionally, when recording for a long time using a magnetic recording/reproducing device, the traveling of the first magnetic tape of the first magnetic recording/reproducing device is stopped using a plurality of magnetic recording/reproducing devices. After that, the second magnetic tape of the second magnetic recording/reproducing device is started to run, and recording is continuously performed using the first and second magnetic tapes.

<Problems to be Solved by the Invention> By the way, according to the conventional magnetic recording/reproducing device as described above, from the time when the first magnetic tape stops running until the second magnetic tape starts running, This has the problem that it takes a long time and the recording signal is interrupted during that time.

<Means for Solving the Problems> In order to solve the above problems, the present invention provides at least the first
A magnetic recording and reproducing apparatus capable of continuously recording recording signals from a magnetic tape to a second magnetic tape using first and second magnetic heads, or a recording signal switching circuit capable of supplying the recording signal to the second magnetic head alternatively or to both magnetic heads simultaneously; and supplying the recording signal from the first magnetic head to the recording signal through the recording signal switching circuit. tape end vicinity detection means for detecting when the first magnetic tape reaches the vicinity of the end thereof and outputs tape end vicinity information for a predetermined period while recording on the first magnetic tape; The recording signal switching means changes the recording signal based on the tape end proximity information from the tape end proximity detection means. The second magnetic tape that has started running by being supplied to the second magnetic head together with the first magnetic head is also recorded redundantly, and when the first magnetic tape reaches the end, the running stops. After that, the recording signal is successively supplied only to the second magnetic head.

<Function> Therefore, the second magnetic tape starts running before the first magnetic tape reaches its end, and the recording signals are recorded in duplicate on both magnetic tapes, so the reproduced signal is not interrupted. The information is continuously recorded from the first magnetic tape to the second magnetic tape.

<Example> Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a block diagram of the recording system of the magnetic recording/reproducing device according to the present invention, FIG. 2 is a block diagram of the reproducing system of the same device, and FIG.
Figures [a] to (dl) are operation explanatory diagrams for explaining the operation of the same device.

In FIG. 1, 1 is a recording system A/D converter, which converts an analog signal input from an analog signal input terminal 2 into a digital signal, and outputs the third signal as a recording signal.
As shown in (al) in the figure, the blocks are sequentially formed.

Reference numeral 3 denotes a signal processing circuit, which adds addresses (addresses 0 to 500) to blocks A, B, . . . of digital signals input from the A/D converter 1, respectively. (See fal in FIG. 3) 4 is a tape end vicinity detection circuit, which detects the rotation speed of the reel stand 5 on the supply side of the first magnetic tape 1%, which will be described later. Based on the rotation speed of the supply reel stand 5, the vicinity of the tape end of the first magnetic tape 18 can be detected.

When there are only a few seconds remaining on the tape in the first magnetic tape 13, this detection circuit 4 sends a high-level tape signal to the tape end vicinity information addition circuit 7, recording signal switching circuit 8, and recording system motor control circuit 9. Near end detection pulse (
(see waveform (d) in FIG. 3) is output and maintained at the high level for several seconds until the first magnetic tape 13 reaches its end.

Reference numeral 9 denotes the recording system motor control circuit, which starts running of the second magnetic tape when the tape end vicinity detection speed/L' from the tape end vicinity detection circuit 4 is inputted. It is made.

Reference numeral 7 denotes the tape end vicinity information adding circuit, which adds information from the tape end vicinity detection circuit 4 to the block corresponding to the output timing of the tape end vicinity detection pulse (dl) of the digital signal inputted from the signal processing circuit 3. Based on the tape end vicinity detection pulse, tape end vicinity information is added in a predetermined time width (the time width in which the detection pulse (d) is outputted).The digital signal from the tape end vicinity information addition circuit 7 is sent to the head amplifier 10. Based on the rise of the tape end vicinity detection pulse (dl) from the tape end vicinity detection circuit 4, the digital signal is supplied only to the head amplifiers 10 and 11. Furthermore, the digital signal is supplied only to the head amplifier 11 based on the falling edge of the detection pulse near the end of the tape (dl).

That is, when the first magnetic tape 14 starts running in response to a press of a playback button (not shown), the recording signal switching circuit 8
is switched to the first magnetic head 12 side, and supplies the digital signal from the tape end vicinity information adding circuit 7 to the head amplifier IO. Then, when the first magnetic tape 14 has only a few seconds left and a high level tape end vicinity detection pulse (dl) is input from the tape end vicinity detection circuit 4, both the head amplifier 10 and the head amplifier 11 are input. and supply digital signals to the first and second magnetic tapes 1.
4 and 15tC The same digital signal is recorded in duplicate.

After the first magnetic tape 14 reaches the end and stops, the tape end proximity detection pulse [dl] from the tape end proximity detection circuit 4 is deenergized, and the recording signal switching circuit 8 supplies the digital signal only to the head amplifier 11.

! Reference numeral 2 denotes the first magnetic head, which is capable of recording the digital signal output from the head amplifier 10 on the first magnetic tape 14.

13 is a second magnetic head which transfers the digital signal output from the head amplifier 11 to the second magnetic tape 15J.
It is designed to be able to record C.

In FIG. 3, (bl, (C1) shows the end portion of the first magnetic tape 14 and the second magnetic tape 15 when the magnetic recording/reproducing apparatus records continuously from the first magnetic tape 14 to the second magnetic tape 15. 2 shows a recording pattern near the starting end of the magnetic tape 14 of No. 2.

Digital signal f (block A of at) as the recording signal
, B, . . . are first recorded on the first magnetic tape 14 by the magnetic head 12 of the cylinder 1. Then, when the first magnetic tape 14 has only a few seconds remaining, the recording signal switching circuit 8 starts outputting a digital signal to the head amplifier 11 as described above, and the first magnetic tape 14 reaches the end. The same signal is recorded redundantly on the magnetic tape 15 of the tube 2 by the second magnetic head 13 until reaching the point.

During this time, tape end vicinity information is recorded on both the first and second magnetic tapes 14 and 15.

Then, after the first magnetic tape 14 stops running, the recording signal switching circuit 8 switches as the tape end vicinity detection pulse is deenergized, and the head amplifier 1
Since the digital signal starts to be output only to the second magnetic tape 15, the digital signal is continuously recorded on the second magnetic tape 15.

Next, a block diagram of the reproduction system will be explained with reference to FIG. Incidentally, for convenience of explanation, the same parts as those in FIG.

The first and second magnetic tapes 14 and 15 start running at the same time when a playback button (not shown) is pressed, and the information is input to tape end vicinity information detection circuits 16 and 17 via tape 11.

Reference numerals 16 and 17 are tape end vicinity information detection circuits corresponding to the first and second magnetic heads l2 and 13, respectively. The latter tape end vicinity information detection circuit 17 detects the tape end vicinity information recorded at the beginning of the digital signal recorded on the second magnetic tape 15 in response to the press of the playback button. It is assumed that the second magnetic tape has been rewound to the beginning position of the tape), and at the same time as the information near the end of the tape is detected, the running of the second magnetic tape is temporarily stopped (pause state). , a pause signal is output to the reproduction system motor control circuit 18 so as to maintain this pause state.

On the other hand, the tape end vicinity information detection circuit 16
When information near the end of the tape is detected from the magnetic tape 14, a pause state release signal is output to the reproduction motor control circuit 18 so that the second magnetic tape 15 starts running at the same time. There is.

Furthermore, while detecting the information near the tape end from the reproduced signal, the tape end vicinity information detection circuit 16 supplies a enable signal to an address comparison circuit 21, which will be described later, to set the comparison circuit 21 in a enable state. It is made up like this.

19 and 20 are signal address reading circuits corresponding to the first magnetic tape 14 and the second magnetic tape 15, respectively;
The address of each data in the reproduced signal reproduced from both the magnetic tapes 14 and 15 is read, and the address data is supplied to the address comparison circuit 20C.

21 is the address comparison circuit, and while the enable signal is supplied from the tape end vicinity information detection circuit 16,
Addresses in the reproduction signal of the first magnetic tape 14 read by the signal address reading circuit 19 and the second magnetic tape read by the signal address reading circuit 20]5
and the address in the reproduction signal, and based on the comparison result, a control signal for making both addresses match is outputted to the reproduction system motor control circuit 18fC, and the reproduction system motor control circuit 18 The running of the second magnetic tape 15 is controlled so that the two addresses match.

This comparison circuit 21 is connected to the second magnetic tape 15.
When the address matches the address of the first magnetic tape 14, a switching signal is output to the reproduction signal switching circuit 22.

Reference numeral 18 denotes the reproduction system motor control circuit, which temporarily stops the running of the second magnetic tape 15 based on the pause signal, and pauses the second magnetic tape 15 based on the pause state release signal. The state is canceled and running is resumed, and further, the address of the reproduction signal of the second magnetic tape 15 and the address of the reproduction signal of the first magnetic tape are adjusted based on the control signal from the address comparison circuit 20. The running of the second magnetic tape 15 is controlled so that the two magnetic tapes coincide with each other.

Reference numeral 22 denotes the reproduction signal switching circuit, which switches the reproduction signal from the first magnetic tape 14 to the D/A converter 23 until the switching signal from the address comparison circuit 21 is input.
After the switching signal is input, only the reproduced signal from the second magnetic tape 15 is supplied to the D/A converter 28C.

The D/A converter 23 is connected to the reproduction signal switching circuit 22.
The signal from the converter is converted into an analog signal, and the analog signal is output from the analog signal output terminal 24.

The present invention is constructed as described above, and its operation will be explained next.

First, when performing a recording operation, it is sufficient to press a playback button (not shown) and input an analog signal from the analog signal input terminal 2.

Then, the first magnetic tape 14 starts running, and
The A/D converter l converts the analog signal into a digital signal and inputs it to the signal processing circuit 3.

The signal processing circuit 3 adds address data to the digital signal, and the digital signal is sent to the first magnetic head 12 via the tape end vicinity information adding circuit 7, the recording signal switching circuit 8, and the head amplifier 10. It is recorded on the magnetic tape 14.

Then, when the first magnetic tape 14 has only a few seconds remaining, the recording signal switching circuit 8 switches the recording signal switching circuit 8 along with the first magnetic head 12 based on the tape end proximity detection pulse (d) from the tape end proximity detection circuit 4. Second magnetic head 131
C also supplies a digital signal to which tape end vicinity information is added, and starts recording such a digital signal on the second magnetic tape 14 as well.

After the first magnetic tape 14 reaches the end and stops, the switching circuit 8 supplies the digital signal only to the second magnetic head 13, and thereafter supplies the digital signal to the second magnetic tape 15. Subsequently, the digital signal is recorded.

Next, when reproducing the digital signals recorded on the first and second magnetic tapes 14 and 15, first, the recorded first and second magnetic tapes 14 and 15 are moved to the beginning position of the respective tapes. After rewinding, a play button (not shown) may be pressed.

Then, the digital signals reproduced from both magnetic tapes 14 and 15 are input to tape end vicinity information detection circuits 16 and 17 via head amplifiers 10 and 11, respectively.

The tape end vicinity information detection circuit 17 immediately receives the second
Since information near the end of the tape from the second magnetic tape 15 is inputted, the reproducing motor control circuit 18 immediately stops running the second magnetic tape 15 and enters a pause state based on this information.

On the other hand, the digital signal input to the tape end vicinity information detection circuit 16 is input to the D/A converter 23 via the signal address reading circuit 19 and the reproduced signal switching circuit 22, and after being converted to an analog signal, the analog output terminal 24 Output from

When the first magnetic tape 14 has only a few seconds remaining, the tape end vicinity information detection circuit 16 detects the tape end vicinity information, and based on this, it supplies a pause state release signal to the motor control circuit 181C. The signal is supplied to the address comparison circuit 21.

Then, the reproduction system motor control circuit 18 cancels the pause state of the second magnetic tape 15 based on the input of the pause release signal and resumes running. While inputting, the addresses from the signal address reading circuit 20 are compared, and based on the comparison result, a control signal is output to the motor control circuit 18 so as to match the addresses, and the motor control circuit 18 outputs a control signal so as to match the addresses. The running of the second magnetic tape 15 is controlled by the circuit 18. When the addresses from the signal address reading circuits 19 and 20 match, a switching signal is output to the reproduction signal switching circuit 22.

The reproduced signal switching circuit 22 then outputs only the signal from the second magnetic head 15 to the D/A converter 23 based on the switching signal.

Thereafter, the digital signal reproduced from the second magnetic tape 15 is input to the D/A converter 23,
The D/A converter 23 converts the signal into an analog signal and outputs it from the analog signal output terminal 24.

As described above, the present invention records information near the end of the tape in addition to the original digital signal at the end of the first magnetic tape 14 and the start of the second magnetic tape 15. At the same time as the information near the tape end of the magnetic tape 14 is detected, the second magnetic tape 15 is run, and while the information near the tape end is being reproduced, the reproduction signal from the first magnetic tape I4 and the second The running of the second magnetic tape 15 is controlled so that the addresses of the reproduction signals from the magnetic tape 15 match, and from the time when the addresses match, only the reproduction signal reproduced from the second magnetic tape I5 is successively reproduced. Therefore, when transferring from the first magnetic tape 14 to the second magnetic tape 15, the reproduction signal is not interrupted at all, and reproduction can be performed continuously for a long time.

Furthermore, in the magnetic recording and reproducing apparatus of the present invention, since the recording signal is recorded in duplicate at the end of the first magnetic tape 14 and the start of the second magnetic tape, the recording operation starts from the first magnetic tape. Even when transferring to the second magnetic tape, recording signals can be recorded without omission.

<Advantageous Effects of the Invention> As described above, the present invention starts running the second magnetic tape immediately before the first magnetic tape reaches its end, and records recording signals on both magnetic tapes in duplicate. Therefore, even while the recording operation is transferred from the first magnetic tape to the second magnetic tape, it is possible to record information continuously without omission.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the recording system of the magnetic recording/reproducing device according to the present invention, FIG. 2 is a block diagram showing an embodiment of the reproducing system of the above device, and FIG. 3 is the operation of the same device. FIG. 3 is an operation explanatory diagram for explaining. 4... Tape end vicinity detection circuit, 8... Recording signal switching circuit, 12 and 13... First and second magnetic heads, 14 and 15... First and second magnetic tape. Agent: Patent attorney Takeshi Sugiyama (and 1 other person) Figure 3

Claims (1)

[Claims] 1. A magnetic recording and reproducing device capable of continuously recording recording signals from at least a first magnetic tape to a second magnetic tape using first and second magnetic heads. , a recording signal switching means capable of supplying the recording signal to the first magnetic head or the second magnetic head or simultaneously to both magnetic heads, and supplying the recording signal to the recording signal switching means via the recording signal switching means. a tape end for detecting that the first magnetic tape has reached the vicinity of the end and outputting tape end vicinity information for a predetermined period while recording is being performed on the first magnetic tape by the first magnetic head; It is comprised of a proximity detection means and a motor control means for starting the running of the second magnetic tape based on the tape end proximity information, and the recording signal switching means receives the tape end proximity information from the tape end proximity detection means. Based on the above, the recording signal is supplied to the second magnetic head together with the first magnetic head so that the recording signal is redundantly recorded on the second magnetic tape that has started running, and the first magnetic tape is the end point. 1. A magnetic recording/reproducing device characterized in that, after the magnetic head reaches and stops traveling, the recording signal is successively supplied only to the second magnetic head.