JPS588065B2 - program selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a program selection device particularly suitable for tape recorders.

In order to automatically select a recording point in a conventional magnetic tape playback device, if the information recorded on the magnetic tape is multiple pieces of music, it is necessary to automatically select an unrecorded area between songs, so-called blank area between songs. This was accomplished by recording the control signal separately from the song and counting the number of playbacks of this control signal.

For this reason, with so-called recorded tapes that are generally available on the market, the user has to record new control signals, which is complicated to operate, and requires a device to record the control signals. This led to an increase in costs.

In addition, since such a selection device can only select a single number of songs at one time, it is extremely inconvenient that the desired selection number must be set each time the player reproduces the music.

On the other hand, recently, there are functions that detect the above-mentioned blanks between songs, fast-forward the beginning of the desired song, and play it at a constant speed, and a function that uses this principle to play a preset number of consecutive songs at a constant speed. A device has been invented.

In this case, when detecting a blank between songs, there are generally parts in the song where signals such as pianissimo are missing, so it is easy to mistake this for a blank between songs and cause a malfunction. Since the amount of winding varies with the traveling speed, automatic selection of a plurality of recording locations, so-called program selection, is likely to cause malfunctions and is therefore unsuitable.

Furthermore, conventional setting means have the disadvantage that the operations for making a plurality of settings are complicated, and that malfunctions are likely to occur in the equipment to be set.

For this reason, it is possible to eliminate the above-mentioned drawbacks, and since the number of songs recorded on a tape is not constant and the set capacity must be set appropriately, the number of songs recorded is smaller than the set capacity. There has been a strong desire for a program selection device for a magnetic tape reproducing device that operates well and has excellent functionality, such as considering good countermeasures when the number of songs is large or small.

Therefore, this invention was made with the above points in mind.
In particular, by automatically resetting the setting contents of the storage means after program selection and playback of all the settings stored in advance in the storage means has been completed, it is troublesome to monitor such a state and perform a manual reset operation. It is an object of the present invention to provide a magnetic tape program selection device that eliminates the delay and can immediately prepare for the next operation.

An embodiment of the present invention will be described in detail below with reference to the drawings.

That is, in the figure, 24 is a setting circuit, and this setting circuit 24 has one end commonly grounded and the other end connected to resistors R51 to R6.
A group of non-retention type selection switches S1, -S22, such as pushbutton switches, which are arranged on the same potential by being connected to the 5V power supply line B1 through 2 and a contact point c,
When the selection switch group S11 to S22 is at the point a, only the individually selected switches are turned on, and when the selection switch group S11 to S22 is at the contacts c and b, the switches after the selected switch from the switch group S11 to S22, for example, S , 1, the following S12 to S22 are turned on all at once, and this switch S8
In order to enable the latter effect, transistors Q11 to Q15 whose emitter collector electrodes are connected between adjacent switches of the selection switch group 811 to S22, and two transistors each having a base common to these transistors Q11 to Q15, Resistors R44 to R46 that provide bias, inverters INV11 to 15 and NAND circuit NA that prevent the latter function of the changeover switch S8 from malfunctioning due to the residual voltage of each transistor.
It is composed of ND21 to ND25.

As will be described later, this setting circuit 24 uses information recorded on the magnetic tape (herein, the information is treated as a plurality of pieces of music, and hereinafter simply referred to as songs).

), that is, in this case, by selectively operating the selection switch group S11 to S22 corresponding to the song number, the number can be stored and set in the storage circuit 23 by selectively operating the desired number.

Here, the memory circuit 23 is a flip-flop circuit group FLIP F constituted by a set of two NAND circuits.
In the figure, each input terminal 1 to 12 of the storage circuit 23 corresponds to each output terminal 1 to 1 of the setting circuit 24.
It is connected in accordance with 2.

That is, the selection switch groups S11 to S22 of the setting circuit 24
Before is selectively operated, 5* (corresponding to logic level "1") is output from each output terminal, and the flip-flops of the memory circuit 23 are thereby all set.

Therefore, a group of light emitting diodes LD21 to LD23 for displaying the setting signal are connected correspondingly to the output ends of the group of flip-flops.
None of the setting (number) display circuits 25 consisting of the bias resistor groups R71 to R82 whose ends are commonly connected to the power supply line B1 is lit.

When the selection switch group S11 to S22 is selectively operated, the output terminal corresponding to the number of the operated switch is grounded (corresponding to logic level "0"). The flip-flop corresponding to this is inverted, and the light emitting diode of the corresponding setting (number) display circuit 25 is turned on with a forward bias, thereby displaying which song number has been set.

At the same time, a group of OR circuits OR1 to 1 is connected to one input terminal corresponding to the output terminal of the flip-flop group.
The one input terminal potential of the corresponding OR circuit of the comparison circuit 22 consisting of 2 is inverted and becomes "0".

Here, the changeover switch S8 of the setting circuit 24 is connected to the contact c,
If it is switched to the b side, select switch group Sll
By selectively operating one of the transistors Q11 to Q16, the switches after that operated switch are turned on all at once.For example, if the selection switch S1 is operated, each transistor Q11 to Q16 is connected to the resistor R44. ~R45
Since the bias potential is applied through the transistor Q11, first the transistor Q11 is forward biased and turned on, and then the transistors Q12 to Q16 are sequentially turned on, and the potential of the output terminals 1 to 12 changes as if the selection switch group were turned on. This is because if they are all operated at the same time, they are equivalent to ground potential.

On the other hand, OR circuits OR1 to OR12 constituting the comparison circuit 22
The other input terminal of is a reversible counter COUNTER1,
A counting circuit 19 is connected correspondingly to decoder output terminals 1 to 12 of a counting circuit 19, which is constituted by decoders DECORDER1 and DECORDER2, which are connected by an inverter INV-4 and return the output of the BCD of the counter to a decimal number as one decoder. There is.

This counting circuit 19 connects the clear signal input terminal CL of the counter via the inverter INV.3 to all input terminals (however, in this case, except for the four input terminals, the expander input terminals are used via diodes D20 to D27). ) is the memory circuit 2
3 (arrow A-A in the figure) is connected to the output terminal of the NAND circuit NAND13 connected correspondingly to each output terminal of the flip-flop group constituting the flip-flop group composing the flip-flop group 3. is not working.

The branch output of this NAND circuit NAND13 is connected to one input terminal, and the output terminal of the OR circuit group of the comparator circuit 22 is connected to the other input terminal (this output terminal is connected to the output terminal of the OR circuit group of the comparison circuit 22). It is assumed that the configuration is such that it becomes "0" when it becomes "0" (ground level).

) is connected in common to the output terminal of a comparator circuit 22, and to the other input terminal a logic level "1" is given only when the tape is fed at a constant speed (that is, during playback) and when fast forwarding. The output terminal of the NAND circuit NAND14 to which the illustrated rPLAY (H) terminal is connected is connected to the output terminal of the illustrated "FF ” terminal, and are also branched so that one is connected directly and the other is connected to the resistor R.
4o to the input terminal of the NAND circuit NAND11 of the fast-forward control circuit 27, which will be described later, and NAND11 via the diode D17.
It is connected to the output end of the AND circuit NAND12.

Further, the output of the branched and directly derived NAND14 is also supplied to the input terminal of the NAND circuit NAND8 of the fast-forward control circuit 27 and to the time constant control terminal T11 of the delay circuit 14, which will be described later.

The setting of the desired song number is usually done after turning on a rewind switch (not shown) and rewinding the magnetic tape to the beginning of the tape in order to make the setting operation easier. Alternatively, if the above settings are made before rewinding and rewinding is performed after the settings, the clearing of the count of the counting circuit 19 is canceled and the set state is set.
In this case as well, the counter does not start counting.

That is, this is due to the logic level "0" being applied to the "PLAY[H]" terminal at this time.
0" is transmitted, which becomes the "1" output of the NAND circuit NAND3 constituting the initial operation correction circuit 17 described later, and the monostable multi-by-break MO of the malfunction prevention circuit 18 in the next stage.
NO MIJLTI1 cannot be driven and inverter INV
- It is based on the fact that the input signal transmitted to the addition input terminal UP of the counter via 1 is at the "1" level.

(In other words, the addition count of the counter and the monomultiple are ゜“
It is assumed that the signal is driven at the falling edge from "1" to "0".

) Therefore, only the 0 output terminal of the decoder of the counting circuit 19 is “0”.
” and the other output terminals 1 to 13 are all “1”, so
The other input terminals of the OR circuits OR1-12 of the comparison circuit 22 connected correspondingly to the output terminals 1-12 are "1".
”, and the output of the comparison circuit 22 is ゜“ regardless of the “0” input given from the memory circuit 23 due to the above settings.
1", and at this time the output of NAND13 is also "1" due to the above settings, but at this time "PLAY
(H)” terminal is still “0”, so NAND1
4 is not established, and the "F.F" terminal is held in the "1" state, making it impossible to fast-forward the tape.

After setting the desired song number in this way, switch S7
(START) to set the “PLAY” terminal shown in the diagram to “0”.
"By setting the tape to ", the tape is played back, that is, is fed at a constant speed.As a result, the "PLAY (H)" terminal is given a "1" level, so NAND14 is established, and the "F・F" terminal is A tape set to "0" is in a fast forward state.

Therefore, the tape can be played back at high speed by the heads H1 and H2.

(In normal playback devices, the playback head retracts from the tape running surface during high-speed playback and does not play, but modern playback devices are equipped with cues that play back at high speeds and produce so-called kerosene. When searching for a recording point that you want to play back by listening, or when using a device called a fast-forward cueing device, which fast-forwards all parts of the recording other than the desired one, detects the beginning of the next recording point, and performs constant-speed playback. Similarly, the reproducing heads H1 and H2 are constructed so as to be in contact with the tape running surface to the extent that reproduction can be performed even during high-speed feeding.

)Here, heads H1 and H2 are designed to be able to perform two-channel playback, in order to take stereo playback as an example. (Therefore, even with a single head, mixer 1 described below
1 and preamplifiers A1 and A2.

) The outputs of the heads H1, H2 (generally integrated) are supplied via preamplifiers At, A2 to a mixer 11 comprising resistors R1 to R3 connected in a ladder configuration.

In other words, since this mixer 11 is currently used for two-channel playback as described above,
There are cases in which a signal exists in both R channels at the same time, and cases in which a signal exists only in one of the channels, so by mixing the outputs of both channels in the mixer 11, it is possible to solve both of the above cases. In addition to making it possible to obtain signals, the following parts can be configured in one system.

The ratio of the resistance values constituting this mixer 11 is set appropriately to ensure crosstalk and separation between both channels, for example, 40 dB or more, so that no problem will arise due to mixing.

The output signal of the mixer 11 is supplied to the saturation amplifier 12, which is composed of, for example, an operational amplifier A3 and a resistor and a capacitor externally connected thereto, and is amplified to the saturation point, and then rectified by diodes D1 and D2. It is supplied to a circuit 13 and rectified.

The rectified output signal from this rectifier circuit 13 is supplied to a delay circuit 14, and usually mainly consists of a resistor vR1 and a capacitor C.
A time constant determined by 5 is added to the signal and the signal is supplied to the Schmitt circuit 15 via the transistor Q1.

Here, the time constant added to the rectified output signal corresponds to the rise of the output signal of the delay circuit 14 (ie, in this case, the beginning of the first song).

) is set to be slightly delayed in time from the rise of the "1" level applied to the "PLAY (H)" terminal, so the Schmitt circuit 15 operates with a slight delay.

That is, in this case, the Schmitt circuit 15 is NAND1,
The output of NAND1 in the previous stage is connected to one input terminal of NAND3 of the initial operation correction circuit 17, and the Schmitt input is supplied to the other input terminal of NAND3 by the delay circuit 14. “P.L.A.
Since the input is slightly delayed from the rise of the "1" level from the "Y(H)" terminal, the NAND is applied for this delayed time.
The output of 1 becomes ``0'' after being held as ``1''.

Therefore, NAND3 of the initial operation correction circuit 17 outputs a pulse with a width corresponding to the delay time, and MONO MULTI1 is driven at the falling edge of this pulse, and an output with a pulse width to be described later is sent via INV.1. Counting circuit 1
By being supplied to the addition input terminal UP of the count 9, the counter adds and counts this and outputs the output terminal 1 of the decoder as "
0”.

Here, if the first song is not set when setting the desired song number, that is, the output of the ORI of the comparison circuit 22 is "1", and the outputs of the other ORs 2 to 12 are all "1". Since the output of the comparison circuit 22 is "1", NA
At this time, all inputs of ND14 become “1” and NAND
is established, the output of the NAND 14 becomes "0", the "FF" terminal is held at "0", and fast forwarding continues.

The counting circuit 1 is connected to the OR circuit whose one input terminal of the comparison circuit 22 corresponding to the set desired music number is "0"
This fast-forwarding state continues until "0" of the decoder No. 9 is encountered.

During this time, each output terminal 1 to 1 of the decoder of the counting circuit 19
The light emitting diode groups LD11 to LD11 to L connected corresponding to 2
D22 and a resistor group R21 that applies bias B1 to it
The circuit 21 for displaying the passing song number (position) consisting of R32 has light emitting diode groups LD11 to LD22 in response to the output terminals 1 to 12 of the decoder sequentially becoming "0" according to the counting count. The number of the song being passed is displayed by correspondingly colored lights in sequence.

Therefore, when the display of the passing song number transition state matches the one lit and displayed by setting in the setting display circuit 25, it means that the desired song number has been selected.

That is, during this time, as mentioned above, the N of the Schmitt circuit 15
The output from AND1 rises with a delay of a predetermined time constant added by the delay circuit 14 every time the playback head passes a blank (unrecorded part) between each song on the magnetic tape, and becomes "1".
”, that is, it becomes “0” each time it passes through each song, and “1” at each blank between songs (the noise signal part of the blank part between songs is normally compared to the recording and playback signal of the song. It is easy to detect the drop of 20 dB or more.

), NAND3, to which the output of NAND1 is supplied, will generate pulses as described above while fast forwarding continues, and as a result, MONO MULTI
1 is driven and supplied to the counter of the counting circuit 19 via INV.1, and this is added and counted, and the decoder output terminal is sequentially inverted from "1" to "0" as described above, and the light emitting diode of the display circuit 21 is driven. The groups are displayed by lighting up in sequence.

Thus, in the OR circuit group of the comparator circuit 22, when both inputs, one from the memory circuit 23 and the other from the decoder of the counting circuit 19, become "0" and match, the output of the OR circuit is "0" (ground level). ), the output of the comparator circuit 22 becomes "0", and the NAND 14 is inverted to the "1" level.

Therefore, the "F/F" terminal to which the "1" level is supplied from the NAND 14 becomes "1", so the fast forwarding of the tape is canceled and the tape is set to constant speed forwarding, that is, the playback state, and the speaker is played through the main amplifier (not shown). Make it ring.

On the other hand, at the same time, during this constant transmission, that is, during reproduction, the "1" level is directly transmitted from the NAND 14 to the time constant control terminal Tit of the delay circuit 15, thereby turning off the diodes D9 and D10, which have been on until now. As in the case of fast forwarding, the emitter voltage of the transistor Q2 controlled by the reproduced output signal derived from the heads H1 and H2 to the delay circuit 14 via the rectifier circuit 13 changes to the capacitor 6, which had been short-circuited by the diode D10. By being charged to , the time constant added to the rectified output signal, which had been mainly determined by the resistor R1 and the capacitor C5, as described above, is further increased.
This prevents the counting circuit 19 from malfunctioning due to interruptions in the reproduction signal due to pianissimo etc. present in the music being reproduced.

That is, as mentioned above, by making the time constant of the delay circuit 14 even larger during playback than during fast forwarding, even if the playback signal is interrupted due to pianissimo etc. present in the song, the NAND1 output of the Schmitt circuit 15 is
This is achieved by keeping the value at 0''.

Of course, it is impossible to increase the time constant indefinitely, that is, to make it longer than the inter-song blank, so the interruption of the playback signal caused by pianissimo etc. that exists in the song is longer than the inter-song blank. Errors in the counting circuit that occur in this case are corrected by an error correction circuit 20, which will be described next.

In other words, the error correction circuit 20 corrects the error when the above error occurs because the counter of the counting circuit 19 adds up to a predetermined value or more and enters the playback state before the desired set song number. This is intended to cause the counter to perform a subtraction count.

In this case, the error correction circuit 20 consists of a correction switch S1 and a NAND4, and by operating the switch S1, a subtraction pulse is applied to the subtraction input terminal DOWN of the counter of the counting circuit 19 until the desired set song number appears. This is a fast-forwarding state in which a desired set song number is played.

In this way, when all the desired set song numbers are played back, that is, any program selection of multiple songs is played back, the number of songs recorded on the magnetic tape first reaches the settable capacity (12 in this case).
), the decoder output terminals 1 to 12 of the counting circuit 19 will all be "1" after all selected reproductions have been completed, and the output of the comparator circuit 22 will be "1".
The output of NDI 4 is "0" and the "F・F" terminal is also "0".
On, the tape is fast-forwarded to the end of the tape.

When the end of the winding is reached, a reset pulse is applied to the terminal "sTOP (H)" by an end detection means (not shown), thereby inverting NAND7 of the reset circuit 26 and turning on the transistor Q6.

Therefore, the commonly connected reset input terminals of the flip-flops of the memory circuit 23 are set to "0" to reset each flip-flop, that is, the set storage contents are reset.

At the same time, the output of the NAND 13 becomes "1", the counting circuit 19 is also reset, and the setting display circuit 2
In step 5, the light-emitting diode that was turned on for display is turned off according to the settings.

The program selection device is therefore returned to its initial state and is ready for a tape backside playback operation.

If the number of songs recorded on the magnetic tape is larger than the settable capacity (12 in this case), the tape is fast-forwarded in the same manner as above after all selected playbacks are completed, and the decoder output from the counting circuit 19 The counting state as described above continues until the end 13 becomes "0" (therefore, in this case, for example, the 12th
If the song number is set, this will be the period until the beginning of the next song.

), that is, in this case, the delay circuit 1 after the end of the 12th song.
After the time determined by 4 has passed, the output terminal 13 of the decoder becomes "0", the NANDs 5 and 6 of the reset circuit 26 are inverted, the transistor Q5 is turned on, and the setting contents of the memory circuit 23 are reset in the same manner as described above, and the counting circuit 19 is also turned on. Reset and also turn off the light emitting diode that was lit on the display.

In this case, since the NAND14 output is "1", the "F・F" terminal also becomes "1", and fast forwarding is canceled and the first
The third and subsequent songs are in the playback state.

(At this time, the counting circuit 19 is held in the reset state as described above, so it does not operate.

) If you want to perform program selection playback for the 13th track and below, assume that the 13th track is the first track, and then the second and third tracks in turn, and enter the desired track number in the same way as above. Just set it.

In the above, the malfunction prevention circuit 18 prevents the counting circuit 19 from making a false count when the signal deletion part due to pianissimo etc. that exists in the tape recorded music is longer than the blank between songs. In this case, the malfunction prevention circuit 18 is composed of a monostable multi-bibreak MONOMULTI1, and as mentioned above, during playback, the playback output is given from NAND1 of the Schmitt circuit 15 and NAND3 of the initial operation correction circuit 17 via the delay circuit 14, and the MONOMULTI is
By setting the output pulse width of the ULTI 1 to about 4 seconds, it is possible to prevent erroneous counting in the counting circuit 19 even if the playback output is interrupted for a longer time than the inter-track blank during high-speed playback.

In other words, except for special music, the required performance or playback time for each song recorded on the tape is usually 2 to 3 minutes.
minutes, while the tape speed during high-speed playback is constant (playback)
Since it is about 30 times the time of forwarding, the high-speed playback time required for one song is about 4 to 6 seconds, and therefore, as mentioned above, the
By setting the output pulse width of NoMULTI1 to 4 seconds, it is possible to cover most of the music with a playing time of about 3 minutes. Even if there is a trigger, the trigger will not be re-triggered for 4 seconds after being triggered, which can prevent the counting circuit 19 from erroneously counting.

Note that if the error cannot be covered by the malfunction prevention circuit 18, the above-mentioned error correction circuit 20 can be used to correct the error.

In general, the fast-forward running speed of the tape varies depending on the winding amount, so it is naturally expected that the playback time of blanks between songs will vary.

Therefore, the fluctuation of this tape running speed is shown at the input terminal IN1,
A tape speed detection signal, which fluctuates with the characteristics shown in the figure, is applied by a tape speed detection means (not shown) (in this case, the tape speed detection signal is a signal having frequency characteristics corresponding to the speed of the tape).

) A compensation circuit 16 having a function of correcting fluctuations in the playback output signal due to tape speed fluctuations is provided.

That is, the compensation circuit 16 includes a capacitor C8 and a resistor R1.
A time constant circuit consisting of 2 allows only the frequency input that fluctuates above a certain level (i.e., a signal caused by the tape speed to fluctuate above a certain level) to pass through, supplies it to transistor Q3, amplifies it, and then rectifies it with diodes D11 and D12. Further amplification is performed by transistor Q4, and finally transistor Q3
By turning on the delay circuit 14, a time constant corresponding to the charging time of the capacitor C7 is added to the time constant of the delay circuit 14, and a correction is made to the inter-track blank time fluctuated through the heads H1 and H2 for reproduction. , Schmitt circuit 1
This is to ensure that the output that causes 5 to operate with a delay as described above is always stably obtained.

In addition, at the moment when the tape moves from constant speed to high speed, ie, fast forwarding and rewinding, the tape vibrates relative to the head, so the tape momentarily floats away from the head or comes into contact with it. In other words, temporary no-signal states may be repeated intermittently, leading to malfunctions.

Therefore, the NAN of the circuit 27 to prevent such malfunctions
The latter-stage NAND2 output and NAND14 output (that is, the same potential as the "FF" terminal) of the Schmitt circuit 15 are applied to D8 to invert the NAND8, and this inverted output is branched to directly connect one to the other to INV. 6, a resistor R38, and a capacitor C17.

The output pulse of MONO MULTI2 triggered by NAND10 is given to the other input of NAND9, and NAND10 has the output of NAND14 added to one input terminal via diode D14, and consists of NAND15 and NAND16. The output of the flip-flop circuit is added, and the other input terminal is NAN
Since the output of the flip-flop circuit consisting of D11 and D12 is added, the NA is
MONO MTJLTI2 is triggered by ND10, and this output pulse causes the output of NAND9 to remain "1" even if the intermittently repeated no-signal state occurs.
” and inverted NANDI11, 12, or N
The flip-flop circuit formed by ANDs 15 and 16 can be maintained and malfunctions can be prevented.

Also, during playback of a predetermined song, switches S4 and S5 (REPEAT
) at the same time (may be used as an interlocking switch), a predetermined song can be played repeatedly.

In other words, the output of the NAND 14 is "1" while playing a predetermined song.
Therefore, the output of NAND8 is the Schmitt circuit 15.
After the output of the NAND 2 of
After the time constant added in step 4 has elapsed, it becomes "0" and becomes "1", and a "0" level pulse with a time constant determined from C17 and R33 is generated at the output of NAND9, which is generated by the above switch operation. FLIPFLOP1 set
The output ζ of said FLIPFLOPI3 is
is set to "0", the flip-flop consisting of the NANDs 15 and 16 is inverted, and the REwI terminal shown in the figure is set to "0" to enter the rewind state, and the rewind display light emitting diode LD2o is turned on.

Then, due to the inter-musical blank at the beginning of the predetermined song, the output of the NAND2 of the Schmitt circuit 15 becomes "0", and a pulse of the "0" level is generated at the output of the NAND9 in the same manner as described above, thereby causing FLIPFLOP1
The output ζ of 3 is set to "0" and the NAND 15, 1
Reset the flip-flop consisting of 6 and
Repeated reproduction is possible by setting the EWJ terminal to "1" and performing constant speed reproduction.

It is assumed that the switches S4 and S5 are turned off when operated.

Furthermore, if the switches S4 and S5 are not operated, and the switch S6 is operated and the switches (not shown) connected to the RES■ and [F-FJ terminals are operated, the beginning of the song or the next song The head part can be exposed.

It is assumed that the switch S4 is turned off when operated.

Further, the output terminal of the comparator circuit 22 is connected to the other input terminal of the INV.1 via the switch S2 (
(C-C), if the switch S2 and the switch S3 are set in an interlocking relationship with the REPEAT switches S4 and S5, the counting circuit 19 can be operated by operating the switch during program selection playback based on the desired song number setting. The counter does not add and count, and the settings in the storage circuit 23 are not reset either, so the song can be played repeatedly.

By the action of NANDs 5 and 6 of the reset circuit 26, a reset pulse can be applied to the memory circuit 23 when the program selection device is powered on.

In addition, the above-mentioned initial operation correction circuit 17 uses the Schmitt circuit 15 because the rising edge of the playback signal is delayed by the time constant added to the playback signal by the delay circuit 14.
As a result of holding the output of AND1 in the "1" state for the delayed time, the addition input given to the counting circuit 19 via the malfunction prevention circuit 18 is delayed by the delayed time and then input.

As described above, this operation prevents malfunction by masking the signal deletion portion that is shorter than the time corresponding to the unrecorded portion existing in the song, and also has the effect of correcting the initial operation in the counting circuit 19. It also serves as

That is, after setting the desired song number, the switch S7 (STA
Since the magnetic tape is in a non-running state until the operation of RT) is performed, the addition input of the counting circuit 19 is not input and the decoder output terminal 0 becomes "0".

Therefore, the light emitting diodes LD11 to LD22 do not light up.

Then, by operating switch S7 (START), the magnetic tape runs and the first song is played.
As described above, since the counting circuit 19 counts by the pulses generated after the time constant added by the delay circuit 14 has elapsed after the end of the song, the decoder output terminal 1 after the end of the first song.
This causes an inconvenience that the number becomes "0" and does not match the number of the setting contents.

Therefore, by operating the switch S7 (START), the "1" level of the "1-PLAY (H)" terminal is generated and the output "1" of the NAND1 of the Schmitt circuit 15 generated by the delay circuit 14 is used to generate the initial operation correction circuit. 17
This is prevented by generating a pulse from NAND3.

In other words, it is possible to modify the initial operation.

In the figure, switch (RESET) S2 is a switch for resetting the memory circuit 23, and is used when modifying or canceling the settings of the desired song number.

Therefore, as described in detail above, according to the present invention, in particular, by automatically resetting the setting contents of the storage means in a state where the program selection reproduction of all the setting contents preset and stored in the storage means has been completed, It is possible to provide a magnetic tape program selection device that eliminates the trouble of monitoring such a state and manually performing a reset operation, and can immediately prepare for the next operation.

[Brief explanation of drawings]

FIG. 3 is a circuit diagram showing an embodiment of the magnetic tape program selection device of the present invention. H,, H2...head, A1, A2...preamplifier, 1
1... Mixing circuit, 12... Saturation amplifier, 13... Rectifier circuit, 14... Delay circuit, 15... Schmitt circuit, 16
... Compensation circuit, 17 ... Initial operation correction circuit, 18 ... Malfunction prevention circuit, 19 ... Counting circuit, 20 ... Error correction circuit, 21 ... Tape running position display circuit, 22 ... Comparison circuit, 23 ... ...Memory circuit, 24...Setting circuit, 25...
Setting display circuit, 26... Reset circuit, 27... Malfunction prevention circuit.

Claims (1)

[Claims] 1. A means for storing the contents set by a plurality of setting means, a means for detecting and counting control signal portions corresponding to each of the pieces of information from a reproduction signal of a magnetic tape on which a plurality of pieces of information are recorded, and this counting means. means for comparing the output and the setting contents of the storage means; means for switching the magnetic tape from high-speed playback to constant-speed playback when a matching signal is extracted by the comparison means; and operation setting based on an end detection signal of the magnetic tape. 1. A program selection device for a magnetic tape, comprising: a setting circuit for resetting the setting contents of the storage means using an output signal of the setting circuit.