JPS6034119Y2 - Tape recorder control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a tape recorder, and particularly to a control circuit that facilitates cue playback.

Recently, tape recorders have been equipped with a so-called cueing function that allows undesired parts of multiple data such as songs recorded on a tape to be skipped at high speed and playback can be performed at a constant speed from the beginning of the desired part. be.

By the way, conventional cueing devices have complicated circuits for setting the desired cueing part, and use a plunger when switching from high-speed running to constant-speed running, making them large and consuming large amounts of power. However, it has the drawback that it is not easy to implement because the overall cost is high.

For this reason, there has been a strong desire for a cueing device that can perform cueing playback more easily than before, but even if the configuration could be simplified, it is not easily realized because the operation tends to be complicated. It was.

Therefore, this idea was made in view of the above points, and it is an extremely good tape recorder that not only has a simple configuration but also is easy to operate and can operate reliably without malfunction. The purpose is to provide a control circuit.

That is, the control circuit for the tape recorder according to this invention is a first circuit whose output level is set to a low level or a high level depending on the presence or absence of an inter-data signal from a tape recording a plurality of data obtained in a high-speed playback state. a second circuit that is charged and discharged according to the output level of the first circuit; a third circuit that constantly supplies charging voltage to the second circuit; and an output voltage of the second circuit. The present invention is characterized by comprising a fifth circuit that stops the tape drive motor for a predetermined period depending on the magnitude relationship with the voltage supplied in the high-speed reproduction setting state.

First, the basic configuration will be briefly explained with reference to FIG. 1. When performing a cue function, both the constant speed playback operation system 11 and the fast forward or winding high speed operation system 12 are operated at one time. Must be locked in operation.

These constant speed playback operation system 11 and high speed operation system 1
A drive voltage from the power supply 15 that drives the muting circuit 13 and the cueing circuit 14 is supplied by the cueing leaf switch S2, which is brought into the closed state only when both the muting circuit 13 and the cueing circuit 14 are operated. Ru.

However, in this case, it is assumed that the power supply (leaf) switch S□ is in a closed state in conjunction with the regeneration operation system 11 (this also applies when the high-speed operation system 12 is operated alone).

Further, by closing the power supply (leaf) switch S, the drive voltage from the power supply 15 is also supplied to the motor 16 serving as the tape drive source, and the motor 16 comes to be driven via the motor drive circuit 17.

Here, the motor drive circuit 17 functions to drive the motor 16 unless a cue detection signal is supplied from the cue circuit 14, and to stop the motor 16 only when a similar detection signal is supplied. It is something.

In this case, the tape drive mechanism (not shown) sets the tape to a high-speed playback state in either the forward or reverse direction, and a high-speed playback signal is derived from the magnetic head 18.

This high-speed reproduction signal is then supplied via the preamplifier 19 to the muting circuit 13 and cue circuit 14, which have already been driven as described above.

Here, the former muting circuit 13 mutes the high-speed reproduction signal so as not to lead it to the power amplifier 20 (in some cases, only a small amount may be led out). Therefore, in this case, as a general rule, the speaker 21 No playback signal is played.

The latter cue circuit 14 detects the inter-data portions of a plurality of data recorded on the tape.
For example, a cue detection signal is output for a certain period of time by detecting a no-signal portion between blanks between songs.

That is, in such a high-speed playback state, for example, when the tape reaches an inter-track section, the cue detection signal is output from the cue circuit 14 for a certain period of time. The motor 16 is then stopped for a certain period of time, and tape running is interrupted for this certain period of time (for example, about 4 to 5 seconds).

The cueing detection signal from the cueing circuit 14 is also supplied to the alarm display circuit 22 and the alarm oscillation circuit 23, and the former alarm display circuit 22 detects, for example, if the light has been turned off (it can also be lit). The arrival of the inter-track portion of the tape is indicated by lighting or blinking the display element.

Further, the latter alarm oscillation circuit 23 sends an intermittent sound signal to the power amplifier 20 and sounds it from the speaker 21 to warn that the inter-track portion of the tape has arrived.

The arrival of the inter-track section of the tape (generally, the same applies below the data section) is announced through such light display or audible alarm, but this does not prevent the user from doing so. If you do not wish to play the next song, you can leave it as it is. After a certain period of time when the cue detection signal disappears, the motor drive circuit 17 is restored, the motor 16 is driven again, and the tape is played again at high speed.

In this way, the motor 16 is stopped and a notification is made each time the inter-track part of the tape arrives, so that the cueing operation system 24, the several-head operation system 24 will function to unlock only the high-speed operation system 12 and cause the constant-speed playback operation system 11 to switch to the constant-speed playback state. This makes it possible to cue up and play a portion.

When this cue playback is being performed, the high-speed operation system 12
is released from the operating state, muting circuit 1
3 is in a non-operating state, and a constant speed reproduction signal from the magnetic head 18 is played from the speaker 21 via the preamplifier 19 and power amplifier 20, and the cueing circuit 14 is also in a non-operating state, so that the reproduction signal from the magnetic head 18 is not activated during the inter-track period. There is no announcement of its arrival.

In terms of circuitry, such a tape recorder cueing device simply requires a cueing circuit and its notification circuit, and does not require any complicated setting circuitry, and mechanically, it can be operated at high speeds. Since only a cueing operation system for releasing the operation system is required and no electro-mechanical conversion mechanism such as a plunger is required, there is an advantage that the configuration can be made very simple and compact.

In addition, for the operation, if you first lock both the constant speed playback operation system and the high speed operation system in the operating state at a time, then you only need to operate the cueing operation system at the desired part based on the notification that the data interval has arrived. This has the advantage of being very simple.

Next, we will specifically explain some points that have been devised to enable cue playback based on the above basic configuration to be performed reliably without malfunctions and to further demonstrate its usefulness. do.

That is, FIG. 2 shows a specific example of the cueing circuit 14 in FIG. 1, and when performing the cueing function,
As described above, the several cueing circuit 14 is activated via the power supply (leaf) switching and cueing leaf switch S2.

Here, taking as an example the case where the cue circuit 14 detects a no-signal part between songs as a tape data interval detection circuit, the high-speed reproduction signal applied to the input end is amplified to the saturation point, and when a signal is present, A saturation amplifier 141 that has a function of clamping to a certain predetermined high level and to a certain predetermined low level when there is no signal, a detection circuit 142 that detects the output of the saturation amplifier 141, and an output from this detection circuit 142. It is comprised of a Schmitt circuit 143 that discriminates the level, that is, the presence or absence of a data interval detection signal, and a cue detection signal generation circuit 144 that generates a cue detection signal in response to the output state of the Schmitt circuit 143.

Then, the cueing detection signal generation circuit 144 connects the first and second transistors Q1. Q2.

Of these, the cue detection signal from the first transistor Q1 is transmitted from the transistor Q3.
Q is reversed from the OFF/ON state to the ON/OFF state, and is used to stop the motor 16 for a predetermined period of time.

Further, the cue detection signal from the second transistor Q2 applies a driving voltage to the alarm display circuit 22 and the alarm oscillation circuit 23, and is used to notify when a no-signal portion is detected.

In other words, when the second transistor Q2 turns on,
In FIG. 3, a driving voltage is applied to each transistor Q, to Q6 of the long and short cycle astable multivibrator AM1°AM, which constitutes the alarm oscillation circuit 23, so that the output of the former switches the latter. An oscillation output with an intermittent period as shown is derived from the output terminal OUT for a predetermined period and is supplied to the power amplifier 20 shown in FIG.
An intermittent sound such as beep, beep, etc. is emitted.

In addition, in this case, the light emitting diode LED inserted in the collector circuit of the transistor Q8 in the astable multivibrator AM2 on the long period side to constitute the alarm display circuit 22 is also lit intermittently for a predetermined period when a no-signal area is detected. In other words, it becomes a blinking state.

Note that 25 in FIG. 2 is a third transistor Q□ which is turned off as the base potential at point A in the figure falls.

As a result, the transistor Q that constitutes the astable multivibrator AM is changed from the previously driven state to the stopped state.

, Qll, and a light emitting diode LED inserted in the collector circuit of the transistor Q10.

During cueing, this tape run display circuit 25 is supplied with a driving voltage from the third transistor Q, which is turned on when the tape is running at high speed and no signal area is detected. It flashes to indicate that the tape is running, and when a no-signal area is detected, it is stopped and kept in the off state as described above.

In other words, by using the alarm display circuit 22 and the tape run display circuit 22 together, it becomes easy to distinguish between a state in which a no-signal portion is detected and a state in which it is not detected.In this case, the light emitting diode LED□, L.E.
It will be even more convenient if the display colors of D2 (another display element may be used) are different.

In addition, when the transistor Q8 is short of current, the light emitting diode D□ inserted in the long-period astable multivibrator AM2 as the alarm display circuit 22 is connected to the capacitor C2 or C3 in the same vibrator AM2.
It is also possible to insert them in parallel.

Next, to explain the cue detection signal generation circuit 144 in the above, the capacitor C1 connected to the output terminal of the Schmitt circuit 143 is connected to the power supply (leaf) switch S1.
Since a predetermined voltage Vcc is charged and supplied from the power supply 15 via the resistors R1 and R2 regardless of the closing (operation) of the switch S2 (for cueing), the voltage Vcc is shown in FIG. 4a when viewed from one point A. Both the switches S1. It is charged to the potential Vcc before time t1 when S2 is closed.

Then, at time t□, both switches S1. At the moment S2 is closed, a stabilizing circuit (not shown) is installed at point A, and a predetermined voltage ■ is applied from the power supply 15 through both switches S□ and S2.
st starts to be superimposed, but at this point the no-signal part has not yet arrived, so for example, the output side transistor Q of the Schmitt circuit 12 to which a bi-level signal is supplied via the saturation amplifier 141 and the detection circuit 142 By turning on □3, the charging voltage V of capacitor C1
The battery is discharged from cc+Vst to the charging voltage Vcc.

In this state, if a no-signal region is reached at time t2, the corresponding output transistor Q□3 of the Schmitt circuit 143 to which a low-level output signal is supplied is turned off, so that point A is reached. The potential of is Vcc
After dropping from the potential to the potential Vst, Vc again
The battery will be charged to a potential of c.

In such a state, transistor Q1. Q2 is a period T during which the base potential is lower than the potential Vst by about 2VBE.

N operations are allowed.

As a result, the cue detection signal is output for period T as described above.

The motor 16 is brought to a stopped state by N times via the motor drive circuit 17, and the alarm display circuit 22 and alarm oscillation circuit 23 are brought into a driven state.

During this period TON, capacitor C1 and resistor R1,
It is determined by the charging time constant due to R2, and is set to a constant time of about 4 to 5 seconds as described above.

By the way, the cue detection signal generation circuit 144 as described above
According to the method, the power supply (leaf) switch S1 and the closing (
In other words, the charging current is always supplied directly from the power source 15 regardless of the operation (in other words, the transistor Q□) prior to the setting operation for performing the cueing function.

Since Q2 is provided with a base potential higher than that at which it is in an inactive state, there is an advantage that malfunctions that tend to occur in a transient state when the power is turned on can be prevented.

In this case, the base potential of point A is connected to Zener diode ZD
By stabilizing the battery according to 1, it is possible to reliably prevent various malfunctions that tend to occur when replacing the battery with a new one when the voltage of the battery power source decreases or when the ripple component fluctuates while using an AC power source. I can do it.

Furthermore, by setting the bias to the emitters of transistors Ql and Q2 to be lower than point A and supplying it through a stabilizing circuit (not shown), the above-mentioned malfunction prevention can be more reliably achieved. The rise characteristic during operation can also be accelerated by the diode D□ inserted in the bias circuit.

Next, the cue hold circuit 26 attached to the cue detection signal generation circuit 144 as described above will be explained.

That is, the cue detection signal generation circuit 144 stops the motor 16 via the motor drive circuit 17 for a predetermined period of time in response to the cue detection signal as described above, and drives the alarm display circuit 22 and alarm oscillation circuit 23. However, the role of the cue hold circuit 26 is to prevent malfunctions that occur in connection with the former motor stop operation.

In other words, in this case, the motor 16 is stopped by switching with the transistor Q interposed on the ground side of the motor 16, and the inertia of the flywheel of the tape recorder mechanism driven by the motor 16 causes Since the tape tends to remain for a long time, even if the motor 16 is stopped, tape running does not immediately stop, and there is some overshooting.

This is the detection time constant of the entire cueing circuit 14 and the motor 1.
The delay caused by the winding inductance of the 6 itself is also involved, but in any case, it is undesirable for the tape to go too far, and if it goes to the beginning of the next song, it will be impossible to find the beginning. .

Therefore, although it is necessary to shorten the detection time constant,
This is especially true because high-speed playback at the time of cueing involves a speed change of 15 to 2 degrees between the tape winding start and the tape winding end compared to the tape speed during constant-speed playback. In a short track section near the end of the winding where the winding speed is quite high, the cue detection operation becomes a bit sensitive, but malfunctions such as half-hearted operation that does not stop the motor are likely to occur.

To explain this with reference to FIG. 5, T8 in a of the same figure
From the leading edge of the no-signal portion, the output signal of the Schmitt circuit 143 transitions from high level to low level with a detection time constant τ as shown in the figure, and cue detection starts.

However, the motor 16 will advance by M due to the inertia of the motor itself and the flywheel, but if r+M during this time is longer than TB, it will move on to the next operation without stopping.

Incidentally, since the flywheel is closely related to the wow and flutter characteristics, it is impossible to reduce the inertia force below a certain level.

In this case, even if the motor 16 is not stopped, the cue detection operation is too sensitive as described above, causing only the alarm display circuit 22 and alarm oscillation circuit 23 to malfunction.

Therefore, if the cueing detection operation is started with a detection time constant D when a no-signal portion has arrived, the motor 16 will be forcibly stopped in any case after a certain period of time T', which is shorter than M, has elapsed. The content of the cue hold circuit 26 is to hold the cue detection operation in a circuit-wise manner so that the cue detection operation is performed reliably.

That is, as described above, the cue hold circuit 26 turns on the transistor Q after a certain period of time T' determined by the resistor R3 and the capacitor C4, which turned on the transistor Q when the no-signal portion arrived. , the output terminal potential of the Schmitt circuit 144 is set to the collector-emitter voltage V
This is to hold the signal at the CE level and make it appear as if the no-signal section continues.

Here, the reason why the operation of the cue hold circuit 26 has a delay time is that if it were not present, there would be a short blank time TB', which is less than the guaranteed blank time TB, which always stops the motor 16. If TB'>
If r, the above-mentioned hold effect is immediately performed to prevent malfunction.

In other words, the following relationship is maintained: TB-I0M=Ding-Jyudyo'.

Also, in the unlikely event that the advance time (stop time) M of the motor 16 varies due to the inertia of the motor 16 and the flywheel, T
Even assuming that M' exceeds B, that is, the beginning of the next song, the input to the Schmitt circuit 143 is inverted from low level to high level, but the output terminal potential of the Schmitt circuit 144 is the same as described above. Just like Vcl! (Yuo
Even in such a case, the cueing detection operation that reliably stops the motor 16 is guaranteed.

The switching transistor Q in the motor drive circuit 17 is shown in FIG.

(Collector current) -■.

. (Collector-emitter voltage) It is preferable to use a curve whose slope angle α is as large as possible.

This is because if the tape recorder mechanism is equipped with an automatic stop mechanism ASO that derives its drive source from a motor or flywheel, that much extra torque is required when the ASO is activated, causing h to rapidly increase. This is because the motor 16 may stop due to such changes.

Further, the above-described cue hold circuit 25 can be replaced by a mechanism in which a mechanical brake is applied to the flywheel at the same time as the motor stops.

Next, I will explain the motor noise removal circuit 27. This circuit prevents various pulse noises generated from the motor while it is driving from having an adverse effect on other circuits (especially the medium wave circuit of a tape recorder with a radio). This is necessary in order to prevent this, but especially in relation to the system in which the motor is stopped for a predetermined period of time via the motor drive circuit 17 during the cueing detection operation as described above, how to prevent the cueing function from occurring. This design is designed to effectively remove motor noise without causing any damage.

In other words, this type of motor noise removal circuit is normally used when the motor to be used is equipped with a mechanical governor, or even when it is equipped with an electrical governor but is not of very high quality. This is achieved by inserting electrolytic capacitors Go in parallel at both ends, but if such a measure is taken, the cueing function, which stops the motor 16 during cueing detection operation, will be impaired.

That is, in this case, the transistor Q of the motor drive circuit 17
is turned from on to off, and the ground side potential of the motor 16 is set to a high potential, so that the charge remaining in the electrolytic capacitor Co is discharged through the motor 16.

As a result, as shown in FIG. 2, it is the time THM from when the transistor Q is cut off until the potential across the motor 16 becomes equal to or lower than the operating voltage level VHM of the motor.
Therefore, the motor 16 will operate redundantly.

If the beginning of the next song is entered during this overrun state, if the cue hold circuit 26 described above is not present, the transistor Q will immediately return to the on state, so the motor 16 will not stop at all. This is because the operation will move on to the next operation.

Therefore, if the motor noise removal circuit 27 in a device equipped with such a cueing function is configured with an electrolytic capacitor q inserted between the power supply side of the motor 16 and the ground, the above-mentioned undesirable problems can be avoided and the noise removal circuit 27 can be effectively removed. It is possible to remove motor noise.

In this case, the capacitance of the electrolytic capacitor C8 inserted at both ends of the motor 16 may be reduced to such an extent that it does not pose a problem, and the electrolytic capacitor C8 may be used in combination with the electrolytic capacitor C5.

Next, the skip circuit 28 attached to the cueing detection signal generation circuit 144 in the above will be explained. This circuit stops the motor 16 for a certain period of time (about 4 to 5 seconds) during the cueing detection operation and notifies the state. It has a function that allows the player to shift to a high-speed playback state midway through without waiting until a certain period of time has elapsed.

In other words, this is useful when you know in advance that the song you want to cue is after a considerable number of songs, and you don't have to wait a certain amount of time for each intervening song. This is an attempt to resolve the problem.

That is, in this skip circuit 28, the movable contact is connected to the power supply 16.
The switch S3 is connected to the switch S3 and has fixed contacts for LOCK and N0N-LOCK, and the resistor R1 is connected to
0.5 seconds), the capacitor C□ is forcibly charged to the potential VCC when the switch S3 is selectively operated, and the first and second transistors Q1
．． A such that Q2 rapidly transitions from on to off state.
This gives the base potential of a point.

In this case, the switch S3 is selectively used, such as using the LOCK contact when skipping only a few songs 1 to 3, and using the N0N-LOCK contact when skipping multiple songs 4 to 5 in succession.

Note that the resistor R1 is inserted to prevent damage to the Zener diode ZD inserted to stabilize the potential at point A, and as a result, the skip operation detection time constant is 0.2 as described above. ~0. If you make it so that you can get a hoe level, if you accidentally touch it, you can immediately re-operate it and it will be able to return to the original cue detection operation and prevent malfunctions. .

FIG. 7 shows another specific example of the skip circuit 28.
By using the operator of the skip switch as the operator of the editor switch, there is no need to increase the number of operators provided on the operation surface.

This is because the editor switch does not need to be operated only when recording, and since the controller is usually a so-called spring-type non-locking type, it is not necessary to operate it during cue playback. Not only will there be no conflict with each other even if it is used also as the operator of the skip switch, but it can also be used in a functionally preferable manner.

That is, in the figure, S4 is a normally closed (leaf) switch that is linked to the above-mentioned normally open cueing leaf switch S2, and one end thereof is connected to the power source 15, and the recording nib/foot switch is connected to the power source 15. The cueing detection signal generation circuit 144 is connected to the cueing detection signal generation circuit 144 through one switch contact S5 and the resistor R4, which are interlocked by the operator 281 which also serves as cueing skip.
is connected to point A at

The other end of the normally closed (leaf) switch S4 is connected to the editor circuit 29 via the other switch contact S6, which is operated by an operator 281 which also serves as a recording nib/foot cue skip.

In the above configuration, if the cueing function is not set, the (leaf) switch S is used.

is in the closed state, so when the operator 281, which also serves as the recording nib and head skip, is operated, a driving voltage is supplied to the editor circuit 29 via the switch contact S6, and when recording, for example, the recording signal supplied to the head is muted. By doing so, it is possible to perform an editor function that creates a predetermined no-signal period.

In this case, even if the switch contact S5 is closed, no problem arises because the driving voltage is not supplied to the entire cueing circuit 14.

On the other hand, if the cue function is set,
Since the (leaf) switch S is in the open state, the editor circuit 29 is not driven in any way, and the skip function at the time of cueing as described above cannot be performed.

In addition, in the above, the operator 281 which also serves as the recording nib and tough cue skip may have LOCK and N0N-LOCK contacts, and in this case, the editor 281 may have LOCK and N0N-LOCK contacts.
Since it has a new function that can be performed using a formula, there is also the advantage that tape erasing can be performed without the need for troublesome operations such as using an erasing plug or the like.

Furthermore, instead of the normally open (leaf) switch S4 that is linked to the cueing leaf switch S2, a recording/playback selector switch for power supply may be used, in which case the switch contact 551 S6 is connected to the leaf switch S2. It is also possible to configure it so that it can be shared by two contacts.

FIG. 8 shows another specific example after the cue circuit 14 in FIG. 1, but the same reference numerals are given to the parts configured in the same way as in the case of FIG. 2, and the explanation thereof will be omitted. ,
Only the parts that are different from the case of FIG. 2 will be explained.

That is, in the case of Fig. 2, the alarm oscillation circuit 23 is driven only when a no-signal part is detected, but in the case of Fig. 8, when a no-signal part is not detected, for example, beep, beep, beep. ..., and when a no-signal portion is detected, the alarm oscillation circuit 23 is driven to make the speaker 21 play a tone of beep, beep, beep, etc., thereby changing the tone. It is possible to change this so that the cueing state can be aurally determined.

In other words, when the cueing state is set, the driving voltage is constantly supplied to the alarm oscillation circuit 23, and the multivibrator ANII2' on the long period side receives the cueing detection signal from the cuing detection signal generation circuit 144. Resistor 9 is connected or disconnected by transistor Q,' (corresponding to the second transistor Q2 in Fig. 2) and Q2/I, which are turned on and off depending on the presence or absence of , and the period is as shown in parts 7 and A. Make it change.

Then, by switching the short-cycle multivibrator AM1' with this output, the output terminal OUT
From there, an oscillation output as shown in FIG. 9 is sent to the speaker 21 via the power amplifier 20 in FIG.

As a result, as mentioned above, if a no-signal part is not detected, a relatively long period beep, beep, etc. notification sound is emitted to report that the cue detection operation is in progress, and the no-signal part is detected. In this case, it is possible to notify that a head has been detected by emitting a relatively short cycle beep, beep, etc. notification sound for a predetermined period of time.

In this case, the alarm display circuit 22 consisting of a light emitting diode LED□' lights up for a predetermined period when a no-signal area is detected to display the state.

It goes without saying that the various circuits provided in the case of FIG. 2 may also be provided in the case of FIG. 8 as well.

Next, the cueing alarm malfunction prevention circuit 30 attached in the case of FIG. This is to prevent malfunctions that occur when the cueing operation is canceled when a decoupling capacitor C6 is inserted in the power line of the cueing circuit 14 system.

That is, during the cueing operation, the capacitor C6 is charged through the resistor 9, but when the cueing leaf switch S2 is opened, the charged charge is removed by the diode D2 of the cueing alarm malfunction prevention circuit 30. In this state, a part of the sound is discharged to the power supply line of the alarm oscillation circuit 23, so the diode D2 The leaning discharge path is cut to prevent any unwanted sound from leaking.

Note that this problem can also be prevented by inserting a so-called transistor thyristor structure at both ends of the cue leaf switch, but this will prevent the same kind of problem that occurs when turning on the power in the radio position in the case of a tape recorder with a radio. cannot be solved.

In other words, when power is turned on in any position,
For the above capacitor C6, power supply 15 → resistor R → capacitor C → transistor Q of Schmitt circuit 143
13 (in the OFF state), the collector resistor is charged via the route, but in the radio position, of course, the cue (leaf) switch S2 is not closed, so no drive voltage is supplied to the thyristor configuration of the transistor. , it was impossible to prevent the charge stored in the capacitor C6 from being discharged to the power supply line of the alarm oscillation circuit 23.

On the other hand, according to the cueing alarm malfunction prevention circuit 30 described above, by inserting only one diode D2, the charge in the capacitor C6 is transferred to the alarm oscillation circuit 2 in any case.
Since discharge to the power supply line No. 3 can be prevented, it is possible to reliably eliminate malfunctions such as leakage of undesired notification sound caused by such a cause.

Note that as the diode D2 of the cue alarm malfunction prevention circuit 30, a germanium diode is not preferable in terms of leakage current, and a silicon diode should be used.

FIG. 10 is an external perspective view showing an example of implementation when the above-described tape recorder is applied to a cassette tape recorder with a radio. speaker, 44,4
5 is a pair of left and right built-in microphones, 46 is a level meter section, 47 is a dial display section, 48 is a volume adjustment section, 4
9 is a tape recorder operating section, 50 is a cueing operating section, 51 is an operating section shared by the recording editor and cueing skip, 52 is a tape counter, 53 is a dial operating section, 54 is a function operating section, etc. , 55 is an antenna, and 56 is a portable bundle.

It goes without saying that this invention is not limited to what has been described above and illustrated, and that various modifications and applications can be made without departing from the gist of the invention.

Therefore, as detailed above, according to this invention, the output level is set to low level or bi level depending on the presence or absence of an inter-data signal from a tape on which a plurality of data obtained in a high-speed playback state are recorded. a second circuit that is charged and discharged according to the output level of the first circuit; a third circuit that constantly supplies a charging voltage to the second circuit;
It is characterized by comprising a fifth circuit that stops the tape drive motor for a predetermined period depending on the magnitude relationship between the output voltage of the second circuit and the voltage supplied in the high-speed reproduction setting state, Therefore, it is possible to provide an extremely good control circuit for a tape recorder that not only has a simple structure but also is easy to operate and can operate reliably without malfunction.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the basic configuration of the tape recorder control circuit according to this invention, Fig. 2 is a circuit connection diagram showing a specific example of the main parts of Fig. 1, and Fig. 3 is an alarm oscillation diagram of Fig. 2. The output waveform diagram of the circuit, Figure 4 is the operation waveform diagram of point A in Figure 2, Figure 5 is an explanatory diagram of the operation of the hold circuit in Figure 2, and Figure 6 is the diagram of the operation waveform at point A in Figure 2.
I of the transistor used in the motor drive circuit shown in the figure. −■. A curve diagram explaining the E characteristic, FIG. 7 is a configuration explanatory diagram showing another example of the skip circuit in FIG. 2, FIG. 8 is a circuit connection diagram showing another example of the main part of FIG. 9 is an output waveform diagram of the alarm oscillation circuit of FIG. 8, and FIG. 10 is an external perspective view showing an example of implementation when FIG. 1 is applied to a cassette tape recorder with a radio. 11... Constant speed playback operation system, 12... High speed operation system, Sl... Power (leaf) switch,
S2...Cue leaf) switch, 13...
... Muting circuit, 14 ... Cue circuit, 15 ... Power supply, 16 ... Motor, 17 ... Motor drive circuit, 18.・・・・・・
Magnetic head, 19...Preamplifier, 20...
... Power amplifier, 21 ... Speaker, 22
...Alarm display circuit, 23...Alarm oscillation circuit, 24...Cue operation system, 25.
... Tape run display circuit, 26 ... Cue hold circuit, 27 ... Motor noise removal circuit, 28 ... Skip circuit, 29 ...
Data circuit, 30...Cutting alarm malfunction prevention circuit, 141...Saturation amplifier, 142...
...Detection circuit, 143...Schmitt circuit, 144...Cue detection signal generation circuit, AMl
, AM2...Multi-by-break, LED□~
LED3... Light emitting diode, Q1~Q13.
...Transistor, ZD ... Zener diode, Dl, D2 ... Diode, Nine to Birds ... Resistor, C0 to C6 ... Capacitor.

Claims (1)

[Scope of utility model registration request] The output level is low or high depending on the presence or absence of an inter-data signal from a tape containing multiple data obtained in a high-speed playback state. A second circuit that is charged and discharged, a third circuit that constantly supplies charging voltage to the second circuit, and the magnitude of the output voltage of the second circuit and the voltage supplied in the high-speed regeneration setting state. A control circuit for a tape recorder, comprising a fifth circuit for stopping the tape drive motor for a predetermined period depending on the relationship.