JPS6161180B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic reproducing device that allows adjustment of the time axis of the period during which reproduced sound ceases.

Recently, shorthand or typing has been practiced while listening to tape recordings.

However, if such a method is used, shorthand or typing may not be able to keep up with the playback speed of the tape.For this reason, in the past, for example, a foot switch was provided, and when the playback speed could not be kept up, the foot switch was turned on and the tape was temporarily stopped. The tape is stopped and then restarted when the shorthand or type has caught up.

However, if tape running is stopped at an appropriate position in this way, the reproduced sound may be cut off in the middle of a syllable, and therefore, when the tape is restarted, the meaning of the first syllable may become unclear.

Therefore, transcribing machines have been developed that have a foot switch equipped with a so-called back space petal for rewinding the tape, but this requires a foot operation, making it more cumbersome to operate.
Further, there is a drawback that the tape may be returned too much, resulting in a loss of time, and such an operation requires skill.

In addition, variable speed control devices have recently been developed that can change the tape speed while keeping the frequency characteristics approximately constant, but such devices require complicated and expensive circuits, making them even more difficult to implement. When I tried using it, I found that the time axis was unnecessarily extended, resulting in a decrease in efficiency.

This invention was made to eliminate the above-mentioned drawbacks, and it is possible to control the time axis of the subsequent playback sound cessation period in proportion to the time axis of the playback sound generation period, and furthermore, the above-mentioned playback sound cessation period continues for a predetermined period or more. It is an object of the present invention to provide a magnetic reproducing device that can perform shorthand or typing of recorded contents accurately and efficiently by being controllable to shorten the time axis.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a magnetic tape on which recorded contents are recorded, and reproduction heads 2 and 3 are provided on this tape 1 at a predetermined interval so as to be able to come into contact with it.

Then, the reproduction head 3 is connected to a speaker 7 via a reproduction amplification circuit 4, a volume volume 5, and an output amplification circuit 6. Further, the output end of the regenerative amplification circuit 4 is connected to one input end of an OR gate 9 via a rectifier circuit 8.

Further, the reproduction head 2 is connected to the other input terminal of the OR gate 9 via a reproduction amplification circuit 10 and a rectifier circuit 11.

The above OR gate 9 compares the output terminal with the shaping circuit 12
is connected to. The comparison and shaping circuit 12 generates an "H" output during this period when the reproduced output applied via the OR gate 9 is at a predetermined level or higher.

The output terminal of the comparison shaping circuit 12 is connected to the pulse generation circuit 1.
3 to the reset terminal of the first flip-flop 14 and to the other pulse generating circuit 1.
5 to the set terminal of the second flip-flop 16. In this case, the pulse generation circuit 13 changes the output of the comparison rectification circuit 12 from "L" to "H".
When the output of the comparison rectification circuit 12 falls from "H" to "L", the pulse generation circuit 15 generates a pulse-like "H" output when the output rises. That's what I do.

Further, the output terminal of the comparison rectifier circuit 12 is connected to one input terminal of a first AND gate 17 and also connected to the first input terminal of a second AND gate 19 via an inverter 18 .

20 is a clock pulse generation circuit that generates a reference pulse; this clock pulse generation circuit 20 divides the output of the oscillation circuit 201 by a frequency divider 202;
Multiple frequency division ratios (1/2 ⁿ⁺² , 1/2 ⁿ⁺¹ , 1/2 in the example shown)
Four types of clock pulses: ⁿ , 1/2 ^n-1 , and 1/2 ^n-2 are generated. Then, a clock pulse output having an arbitrary frequency division ratio of, for example, 1/2 ⁿ is directly applied to the other input terminal of the AND gate 17, and a clock pulse output having the remaining frequency division ratio is applied to the AND gates 203a, 203b, 203c, respectively. 2
It is applied to one input terminal of 03d. In this case, inverters 204a, 204b, 20 are connected to the other input terminals of each AND gate 203a to 203d.
4c, 204d, resistors 205a, 205b, 20
5c and 205d, and a selection switch 206 is connected to the input terminal side of the inverters 204a to 204d.
Corresponding ones of a to 203d are turned on to output clock pulses with a desired frequency division ratio. And these AND gates 203a to 203
The output of d is applied to the second input terminal of the AND gate 19 via the OR gate 207.

The output terminal of the AND gate 17 is connected to the addition input terminal of the addition/subtraction counter 21, and the output terminal of the AND gate 19 is connected to the subtraction input terminal of the counter 21. In this case, the AND gate 19 has its third input connected to the output of the flip-flop 16.

The addition/subtraction counter 21 adds and counts the clock pulses applied via the AND gate 17, and the contents of this count are transferred to the AND gate 19.
The subtraction is performed by a clock pulse applied via the .

Further, this counter 21 has an output end connected to a comparator 22. This comparator 22 is configured to generate an output "H" only when the count content of the counter 21 is "O".

The output terminal of the comparator 22 is connected to the set terminal of the flip-flop 14 and to the reset terminal of the flip-flop 16.

On the other hand, a motor 23 for driving the running of the tape 1 is connected to a control circuit 24, and this control circuit 24 is connected to a power supply +Vcc via a main switch 25.
In this case, the control circuit 24 is for controlling the tape running at a predetermined constant speed. Also, a transistor 2 is connected between the control circuit 24 and the main switch 25.
Connect 6. The base of this transistor 26 is grounded through a transistor 27 and a resistor 28, and the output terminal of the flip-flop 16 is connected to the base of the transistor 27 through an inverter 29.

Further, the control circuit 24 and the transistor 2
A transistor 30 is connected in parallel to the circuit consisting of 6. This transistor 30 directly connects the power supply +Vcc to the motor 23 by turning on, and connects the power supply +Vcc directly to the motor 23.
The base is connected to the above-mentioned flip-flop 14 through a resistor 31.
is connected to the output end of the

The load side end of the main switch 25 is connected to the clear terminal of the counter 21 via the pulse generation circuit 32. In this case, the pulse generation circuit 32 generates a pulse-like "H" output when the main switch 25 is turned on. The contents of the counter 21 are cleared to "O".

Next, the operation of the apparatus constructed as above will be described. First, when the main switch 25 is turned on, the "H" output shown in FIG. 2a is given to the pulse generating circuit 32. Then, from the pulse generation circuit 32,
A pulse-like "H" output shown in is generated, and the content of the counter 21 is cleared to "O" by this "H" output. Then, the "H" output shown in FIG. 2c is generated from the comparator 22 and the flip-flop 14 is set.
The "H" output shown in Figure d is generated and the transistor 30
is turned on [Fig. 2 e].

As a result, the motor 23 is directly supplied with power +Vcc via the transistor 30, so the motor 23
is operated at high speed and rapidly forwards tape 1.

At the same time, the "H" output of the comparator 22 is also applied to the reset terminal of the flip-flop 16. The flip-flop 16 is then reset and generates the "L" output shown in FIG. 2f. As a result, the "H" output shown in FIG. 2g is generated via the inverter 29, turning on the transistor 27.
Next, the transistor 26 is also turned on (FIG. 2h), completing preparations for operation of the control circuit 24.

From this state, the recorded portion of the tape 1, that is, the reproduction sound generation period reaches the reproduction head 2, and the reproduction amplification circuit 10
Therefore, when the reproduced output shown in FIG.
As a result, the "H" output shown in FIG. 2k is generated. Then, at the rising edge of this "H" output, the pulse generating circuit 13 generates a pulse-like "H" output as shown in FIG. This allows motor 2
3 is transferred to the control by the control circuit 24 and the tape 1
Controls running at a predetermined constant speed.

Further, the "H" output of the comparison rectification circuit 12 is also applied to one input terminal of the AND gate 17. In this case, the other end of the AND gate 17 is supplied with a clock pulse having a predetermined frequency division ratio as shown in ^FIG . and gate 1
7, the clock pulse shown in FIG.

After that, when the recorded portion of the tape 1 reaches the playback head 3 and the playback amplification circuit 4 generates the playback output shown in FIG. is generated as.

From this state, the unrecorded portion of tape 1, that is, the period during which there is no playback sound, passes through playback head 2 and is transferred to playback head 3.
When the output reaches "L", the output of the comparison rectifier circuit 12 becomes "L".
to be reversed. Then, when this output falls, the pulse generating circuit 15 generates a pulse-like "H" output as shown in FIG.
is set and from the flip-flop 16
The "H" output shown in is generated. When an “H” output is generated from the flip-flop 16, the inverter 29
This time, since the "L" output shown in FIG. 2g is generated, the transistor 27 is turned off, and then the transistor 26 is also turned off (FIG. 2h), thereby stopping the motor 23 and stopping tape running. Also,
The "H" output of the flip-flop 16 is also applied to the third input terminal of the AND gate 19. In this case, an "H" output is given to the first input terminal of the AND gate 19 via the inverter 18, and a predetermined frequency division ratio shown in FIG. Since a clock pulse (in the illustrated example, a pulse with a frequency division ratio of 1/2 ^n-1) is given, the clock pulse shown in FIG. 2q is given to the subtraction terminal of the addition/subtraction counter 21 through the AND gate 19 As a result, the count content of the counter 21 is now subtracted.

After that, when the count content of the counter 21 becomes "O", the comparator 22 again generates the "H" output shown in FIG. occurs, turning on the transistor 30 again [FIG. 2e]. Then, the power +Vcc is directly applied to the motor 23 through the transistor 30, so the motor 23 is restarted at high speed and the tape 1 is rapidly forwarded.

In this case, the operation stop period of the motor 23, that is, the running stop period of the tape 1, is the addition clock pulse that counts the recorded portion of the tape 1, that is, the playback sound generation period, and is a subtraction clock pulse with a frequency division ratio of 1/2 ⁿ . Since the clock pulse is a pulse with a frequency division ratio of 1/2 ^n-1 , subtraction is performed at twice the speed of addition, which is 1/2 of the time axis of the reproduction sound generation period.
Of course, this time can be changed arbitrarily by the selection switch 206 of the clock pulse generation circuit 20.

This returns to the initial state again, and from then on, Figure 2 i,
The above-mentioned operation is repeated every time the reproduction output indicated by j is generated in the reproduction heads 2 and 3.

By the way, an extremely short playback sound cessation period may occur within the playback sound generation period due to words that are stuck in other than syllable divisions. However, in such a case, the playback output from the playback head 2 is generated before the playback output from the playback head 3 disappears, so the output of the comparison shaping circuit 12 remains at "H", and as a result, the tape 1 runs. continues to play without being stopped.

Therefore, with this configuration, the time axis of the subsequent playback sound interruption period can be controlled in proportion to the time axis of the playback sound generation period, so when there is a long playback sound generation period that takes time to write or type, This allows for a longer period of no playback sound, allowing you to complete your shorthand and typing during this time.In addition, there are no interruptions in the syllables, allowing you to accurately write and type your recordings. can be done. In addition, the motor is first restarted at high speed, and the tape is fast-forwarded during the duration of the playback sound dead period, that is, the period in which the playback head simultaneously detects the playback sound dead period, to shorten the time axis of this period. Since it is possible to do this, wasted time can be saved, and recording contents can be stenographically or typed more efficiently. Furthermore, if the playback sound dead period is extremely short, playback can be continued without stopping the tape running, so the time axis of the playback sound dead period may be unnecessarily controlled due to, for example, words that are not separated by syllables. Also, from this point of view, it is possible to improve the efficiency of shorthand or typing recorded contents. Furthermore, unlike conventional transcribing machines, there is no need for troublesome operations such as stopping and reversing the running of the tape, and it also eliminates the inconvenience of moving the tape too far and wasting time. In addition, the device of the present application can control the time axis of the playback sound cessation period corresponding to the playback sound generation period by simply setting the speed of the subtraction count with respect to the addition count, so the level of skill of the person using the device can be controlled. You can set the optimal conditions according to your needs and work at a pace that suits you, which is also very effective in improving work efficiency. It also has the advantage of being versatile because it can be used simply by setting a prerecorded general-purpose tape.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications within the scope without changing the gist.
For example, in the above-mentioned embodiment, the motor is forcibly stopped for a predetermined period of time when a period of no playback sound is detected, but instead of rotating the motor at a low speed without stopping, the tape is run at an extremely slow speed. It's okay. Furthermore, the circuit configuration and parts used are not limited to the embodiments, and other circuit configurations may be applied.

As described above, according to the present invention, it is possible to control the time axis of the subsequent reproduction sound cessation period in proportion to the time axis of the reproduction sound generation period, and when the reproduction sound cessation period continues for a predetermined period or more, this period It is possible to provide a magnetic reproducing device that can perform shorthand or typing of recorded contents accurately and efficiently by controlling the time axis of the recording medium to be shortened.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a time chart for explaining the embodiment. 1... Tape, 2, 3... Playback head, 4,
6, 10...Width increasing circuit, 5...Volume, 7...
Speaker, 8, 11... Rectifier circuit, 9... OR gate, 12... Comparison shaping circuit, 13, 15, 32
...Pulse generation circuit, 14,16...Flip-flop, 17,19...And gate, 18,2
9... Inverter, 20... Clock pulse generation circuit, 21... Addition/subtraction counter, 22... Comparison circuit, 23... Motor, 24... Control circuit, 25...
...Main switch, 26, 27, 30... Transistor, 28, 31... Resistor.

Claims (1)

[Claims] 1. In a magnetic reproducing device having a tape transporting means and configured to use a reproducing head to reproduce the recorded contents of the tape transported by the means, a reference pulse generating circuit and a reproduction sound from the reproducing head are detected. a circuit for adding and counting the reference pulse only during the duration of the reproduced sound from the first point in time when the tape is being played back; and a circuit for stopping the transport of the tape at a second point in time when the continuous playback sound from the playback head ceases. a circuit that generates a signal, a circuit that performs a subtraction count from the addition count value after the second time point, and a circuit that restarts the tape transfer at a third time point when the subtraction count value reaches a predetermined value. A magnetic reproducing device comprising: