JPS5860479A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record consistent absolute time information on a tape to display the time information, and to confirm the position of the tape accurately, by presetting the counter of a recording system in response to a time signal from a reading means. CONSTITUTION:A recording system is equipped with a presettable counter 6 which counts a clock signal and generates a time signal, a shift register 6 which composes a one-word signal of the time signal and a discrimination signal, and a recording head 1 which records the one-word signal on a magnetic tape T, and a reproduction system, on the other hand, is equipped with a shift register 12 which reads and supplies the one-word signal recorded on the tape T to a latch circuit 14, and a panel 10 on which time is displayed on the basis of the time signal in the one-word signal. Then, the counter 6 is preset by the time signal from the latch circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus that records time information on a magnetic tape, reads it during reproduction, displays the time on a display means, and indicates the absolute position of the magnetic tape.

Generally, in a device such as a tape recorder, it is important to detect where the current tape position is in the overall tape position and how much remaining tape is left during recording and playback.

One of the conventional methods, a tape counter, cannot recognize the exact IF position of the magnetic tape L due to its structure. There is a drawback that it is impossible to detect the tape position.

The present invention was invented in view of the drawbacks of the prior art, and one embodiment thereof will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block electric circuit diagram 1/cl~ showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention. 71 (hereinafter referred to as the recording/reproducing head), 2 i+-, l recording γ1, IIs raw switching switch 71, (hereinafter referred to as the recording/reproducing head) that engages the magnetic tape T, and the recording end r-2a, llJ' 1 Vil+
! r-2b VC11<- can be switched.

Reference numeral 3 designates a clock signal generator that outputs a clock signal CP of a constant period, and its output is sent to a counter circuit via an AND gate 5 based on the ON (closing) of the start switch 4 which is interlocked with the recording/playback switch 2VC. 6 is given.

This counter circuit 6 counts and forms time signals of minutes and seconds based on the clock signal CP, and the count value, that is, the time signal, is provided to the first and second note registers 7.8. .

This second soft register 8 is configured to provide the time information included in the time signal to the decoder 9 and cause the display 10 to display the time.

The first shift register 7 inputs the time signal and synthesizes the time signal with a preset identification signal and a control signal provided from the control signal generator 11 to form a one-word signal. -1 This l word signal is applied to the recording/reproducing head 1 via the recording/reproducing changeover switch -2 to cause magnetic tape TK recording.

Now, to explain the 1-word signal, in this embodiment, as shown in FIG.
bits are given, among which 12 bits from 1 to 12 bits] are assigned the -16 identification signal VC,
Also, 7 bits from bits 13 to 19 are allocated to minutes of the time signal, 7 bits from bits 20 to 26 are allocated to seconds of the time signal, and furthermore, 6 bits from bits 27 to 32 are allocated to the minutes of the time signal. A control signal V is assigned.

Among these signals, the information recorded on the magnetic tape includes a time signal. A signal used to identify whether it is an l word signal or not.
That is why it is located at the head of Ward Shinkyu Middle.

In addition, the control signal is the gist of the present invention VC+(lj1 gate ljl,
Since there is no detailed explanation, I will omit the detailed explanation, but for example, Q, 1゛, 27
One possible use is that the bit of RL is a logical value of '1'' or 11011, which indicates the presence or absence of an interval between songs. In this case, it goes without saying that the control signal generator 1 is connected to a song interval detection circuit and the like.

Returning again to FIG. 1, reference numeral 12 designates the third shift register, and the 1-word signal from the magnetic tape T obtained from the magnetic head 1 and the playback terminal 2b of the recording/playback switch 2 is based on this signal. It is input together with the periodic signal formed by the process.

Reference numeral 13 designates a determination circuit for determining whether or not the first 1 to 12 bits of the l-word signal input to the third shift register 12 are predetermined identification signals, and if the signals are identification signals, a latch command is issued. It is designed to give a signal OK to the latch circuit 14.

When the latch command signal OK is applied, the latch circuit 14 obtains the time signal from the third shift register 12 based on the latch command signal OK, latches it, and gives the latched time signal to the decoder 9, and displays the display 10. It is designed to display the time.

The latch circuit 14 also outputs an output in the direction of the counter circuit 6 in order to supply the latched time signal to the counter circuit 6. Therefore, the counter circuit 6
is a preset counter, which receives a time signal from the relay circuit 14 and receives a part of the start signal ST obtained by turning on the start switch 4 as the load signal Q and LD. It's as good as it gets.

Reference numeral 15 designates a clear switch, and by turning it on, a partial pulse clear signal is supplied from the next-stage one-shot multivibrator I6 to the CL latch circuit 14, and the latched contents of the latch circuit 14 are cleared.

Although the above-mentioned 1-word signal is a one-word signal, in this embodiment, the signal is
CD times (in terms of frequency, it is 1281-Tz).

One embodiment of the present invention is constructed as described above, and its operation will be explained next.

m Regarding the recording mode, we will now explain the case of recording from the beginning of the magnetic tape T where no recording has been made.

In such a case, first, the clear switch 15 is operated to apply a clear signal CL to the latch circuit 14 from the one/yoft multipipe lake 16 to clear the contents of the latch circuit I4.

Next, the recording/playback changeover switch 2 is switched to the recording terminal 2a.

In conjunction with this, on the one hand, a tape drive mechanism (not shown) starts running the magnetic tape T at a constant speed, and
On the other hand, at the same time, in response to the operation of the switch 2, the start switch 4 turns ON, and a start signal ST and a load signal LD are output.

With such a load signal LD, the counter circuit 6 becomes the latch circuit 1.
4 is obtained, but since it has been cleared as described above, the counter circuit 6 has the contents of the instant 0 minute 0 second.

Thereafter, the clock signal CP from the clock signal generator 3 is input to the counter circuit 6 from the AND gate 5 which is in operation upon input of the start signal ST, and a time signal is formed based on this. That is, by counting the clock signals, the amount of time that has elapsed since the magnetic tape T started running is calculated, and the amount of time that has passed since the start of running of the magnetic tape T is calculated. A double signal is formed between lJ.

A part of the time confidence obtained by this counter circuit 6 is
Display unit 10 via 7-foot register 8 and decoder 9
It is displayed every moment and used to display the time. The other one is the identification signal and control signal generator 11 set in advance in the 17th register 7.
After being synthesized with the control signal obtained from Recorded at the frequency level of (frequency).

Therefore, by looking at the display 10, the user can see whether 11 hours have elapsed since the recording start basket, and can also understand the remaining time depending on the type of tape in the VCC Tagawa 7.

Next, a case will be described in which the magnetic tape TVC1, which has been previously recorded including the time signal 'IJ, is further recorded from the middle.

In this case, after setting the magnetic tape T on the deck section, it is preferable to once play back the above-mentioned intermediate portion.

That is, when the recording/playback selector switch 2 is turned on to the playback terminal 2b, the 1-word signal recorded in the middle of the magnetic tape T is transferred to the recording/playback head 1. It is applied to the third soft register 12 via the switch 2, and the register 12 receives a synchronization signal (clock signal )C
It is read and memorized in conjunction with the input of P'. and,
At this time, the discrimination circuit 13 discriminates the identification signal, and if it is a predetermined signal, provides a latch command signal OK to the latch circuit 14 to launch the time signal. The latch circuit 14 supplies the latched time signal to the display 10 via the decoder 9 to display the time.

Therefore, the user listens to the reproduced sound (for example, music) during this reproduction operation, and when a predetermined position (for example, between songs) is reached, the magnetic tape '1' stops running. That is, the system is temporarily set to a stop mode.

Therefore, at this time, the latch circuit 14 receives a time signal (for example, 2
Latch (1 minute 35 seconds) hold it.

After that, when the user inserts the recording/playback switch 2 into the recording terminal 2a, the star/swivel switch 4 turns on as described above, and the load signal L/D is applied to the counter circuit 6. Therefore, the time signal of 21 minutes and 35 seconds outputted from the counter circuit 6Q or the latch circuit 14 is preset, and the clock signal CP obtained through the AND gate 5 is then preset.
The count is increased to 1 minute and 35 seconds, and subsequent time signals are calculated according to the running of the magnetic tape 4'.

Further, the time signal UfN of the counter circuit 6 is finally supplied to the display 10 to display the time as described above, and is converted into a one-word signal in the first shift register 7, and supplied to the magnetic tape TK for recording.

(2) About the playback mode - With a recording mode such as "double series", each 1 word signal,
That is, it is best to set the magnetic tape T on which the time signal has been recorded to the tape deck, and then turn on the recording/playback selector switch 2 to the playback side terminal 2bK. T is run at a constant speed, and in conjunction with this, each one-word signal on the magnetic tape T is reproduced by the recording/reproducing head 1, which is applied to the third shift register 12 via the switch 2. .

This 37th foot register 12 reads and stores the identification signal and the time signal in conjunction with the synchronization signal CP' which is synchronized with each one-word signal. 12, and if it is an identification signal with a predetermined logical value, it is determined that the following signal or time signal is, and a latch command is given to the next latch circuit I4. believe in).

If, the discrimination circuit is inserted with the identification signal 2 and 1.
If the number is not a regular one, wait for input of the next borrowed I word.

Therefore, the launch circuit 1 lI receives the above latch command signal OK.
When inputted, only the time signal is received from the third shift register 12 and latched, and the latched time signal is sent to the display 10 via the next decoder 9. -7 Eh, display the time.

The contents displayed on the display 10 change every moment as the magnetic tape '1' progresses.

Therefore, the user may view this time to assist in calculating the remaining time on the tape.

Since the present invention is constructed as described above, it is possible to store consistent absolute time information on a magnetic tape, and also to display the recorded time information (7) to display the position of the magnetic tape. It is possible to provide an extremely useful tape recorder, that is, a magnetic recording and reproducing device, which can accurately confirm the information of the magnetic field.

[Brief explanation of the drawing]

FIG. 1 is a block electrical circuit diagram of an embodiment of the magnetic recording/reproducing apparatus of the present invention, and FIG. 2 is a diagram used to explain a one-word signal. l: recording/replay head, 6: counter circuit, 10: display, T magnetic tape. Agent Patent Attorney Aihiko Fukushi Procedural Amendment (Method) 1. Display of the case Patent application 1983-157983 2. Name of the invention Magnetic recording and reproducing device 3. Person making the amendment Relationship to the case Patent applicant 4 Attorney 5. Date of amendment order February 4, 1980 6. Amendment Full text of the subject specification 7, engraving of the amended specification (no change in content) 488-

Claims (1)

[Claims] I. In a magnetic recording and reproducing device consisting of a recording system and a reproduction system, the recording system includes a presettable counter circuit that counts clock signals to form a time signal, and a single unit that combines the time signal and identification signal. a 1-word signal forming means for forming a 1-word signal; and a recording means for recording the 1-word signal on a magnetic tape;
J comprising a reading means for reading the one word signal recorded on the magnetic tape, and a display means for displaying the time based on the time signal from the one word signal obtained by the reading means. . A magnetic recording and reproducing device, wherein the recording system counter circuit is preset by a time signal obtained from the reading means.