JPS5841582B2 - Automatic music selection device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic music selection device for a tape recorder that can sequentially play back only desired songs from a large number of songs recorded on a magnetic tape. A circuit generates a count pulse signal every time a non-signal portion passes the magnetic head to cause a counting circuit to count, and the output signal of the counting circuit is connected to a memory circuit that stores in advance the position of the corner song desired to be selected. By comparing the output signal with the output signal using a gate circuit and controlling the fast-forward or rewind circuit with the gated signal, only desired songs can be automatically played sequentially from among the many songs recorded on one magnetic tape. , other parts of the song are fast-forwarded or rewound.

The no-signal detection circuit distinguishes between when a signal is being reproduced by the magnetic head and when it is not being reproduced, and generates a count pulse signal when the signal is no longer being reproduced.

However, if there is a long period in which no signal is being reproduced, and a noise signal is generated during that period, a count pulse signal may be generated, causing the counting circuit to count even though fast-forwarding or rewinding is not actually in progress.

The present invention provides an automatic music selection device for a tape recorder that eliminates these drawbacks.

The present invention will be explained below with reference to the drawings.

In Fig. 1, 1 identifies a signal part where an audio signal is recorded on a magnetic tape (not shown) and a non-signal part where the audio signal is not recorded, and generates a signal when a non-signal part is detected. 2, a counting circuit that counts the number of pulse signals detected by the no-signal detection circuit; 3, a storage circuit that stores in advance the number of songs to be selected;
4 is a gate circuit group that gates the pulse signals from the counting circuit 2 and the memory circuit 3; S is an automatic music selection switch connected to the gate circuit group 4 via a buffer 6;
is a tape running position reset switch, and S3 is a reset switch that resets all settings of desired songs.

The no-signal detection circuit 1 includes an amplifier 8 that amplifies the audio signal reproduced by the magnetic head, a signal modification circuit 9 that converts the audio signal into a digital signal, and an operation that is determined by inverting when a pulse signal is applied to the input terminal. 1st to 3rd retrigger monostable multi-vibration brakes 10a to 10c1J- that maintain the state when pulse signals are applied successively within time
It consists of a flip-flop 10d, an inverter 11a, AND circuits 11b and 11e, and an OR circuit 11d.

The counting circuit 2 also includes a counter 14 for counting the number of pulse signals from the flip-flop 10d, a decoder 15 for decoding the output of the counter 14, and a large number of light emitting diodes 16a and 16b as shown in FIG. It consists of a display circuit 17.

Furthermore, the memory circuit 3 includes a push button device 18 having ten push button switches 18a, 18b, . . . as shown in FIG.
flip-flop 19a.

191]... and a display circuit 20 having a large number of light emitting diodes 20a and 20b.

The gate circuit group 4 sends the output signals of the flip-flops 19 a y 19 b . . . and the signals from the inverters 22 a , 22 b . . . to inverters 22 a , 22 b . It consists of gated AND circuits 23 a y 23 b . . . and an OR circuit 24 .

The operation of the present invention will be explained below.

First, in the tape recorder according to the present invention, all functions start operating when the level becomes "0".

To perform high-speed playback, that is, cue operation, it is sufficient to simultaneously apply a level "0" signal to the playback circuit and the fast-forward circuit.

It is assumed that the automatic music selection switch S1 is initially off (the state shown in the figure).

In this state, the counter 14 is set by the automatic music selection switch S1.
Since the CLR terminal of the flip-flop 10a is grounded to the level "0" between the RD terminal and J- of the counter 14,
Flip-flop 10d and J- are both reset.

Since the RD terminal of the storage device 19 is set to level "1'' by the reset switch S3, any pushbutton switch 1
It can be set by pressing 8a, 18b...

When you want to select the 1st, 3rd, 6th and 9th recorded songs, push button switches 18a, 1
8c.

By pressing 18 f t 181, flip-flops 19a, 19e, 19f, and 19i are set to J-, and the output terminals IQ and 3Q are respectively set.

Set the 6Q and 9Q terminals to level "1'" (Fig. 3).

At this time, the IQ, 3Q, 6Q, and 9Q terminals have a level of 0.
Since the light emitting diode 20 of the display circuit 20
a, 20 Cy 20 f t 20 t is emitted, and it can be confirmed that the target has been memorized.

Next, when the automatic music selection switch S1 is turned on, the playback circuit 25
Since it is grounded to level "0", it is held in the reproducing state.

Also, a flip-flop 1 is connected to the RD terminal of the counter 14 and J-.
Both CLR terminals of 0d are set to level “1”, so
Becomes operational.

When the automatic song selection switch S1 (opposite state to that shown) is turned on, only the a output terminal of the decoder 15 of the counting circuit 2 becomes "0" since it is the first song (FIG. 3).

This a output terminal is inverted by the inverter 22a and becomes level "1", and one input terminal of the AND circuit 23a is set to level "1".

By the way, first, flip-flop 1 is connected to J- of storage device 19.
9a is set, the 1Q terminal is at the level "1", and the other input terminal of the AND circuit 23a is also set at the level "1".

As a result, the output of the AND circuit 23a becomes level "1", and the OR circuit 24, buffer 6 and automatic music selection switch S1
, and sets the fast forward circuit 26 to level "'1".
Since the fast-forward circuit 26 is turned off and only the playback circuit 25 is operated, the currently selected song is played back.

On the other hand, the output signal of the OR circuit 24 (FIG. 3C) is applied to the 1B terminal of the first retrigger multivibrator 10a and the 2B terminal of the second retrigger multivibrator 10b, either directly or via the inverter 11a. Set the level to "1" and set the 2B terminal to level "O".

By the way, the retrigger multivibrators 10 a y 10 b and 10 c used in this circuit are activated when the B terminal is at level "1" and the A terminal changes from level "1" to level "0". I have to.

Therefore retrigger-multi-by-break 10a.

Since only 10c is enabled, when the audio signal is reproduced by the magnetic head as described above, it is amplified by the amplifier 8 and then converted into a pulse signal by the signal conversion circuit 9 (FIG. 4A).
is converted to

The first re-trigger multi-by-break 10a is operated by the fall of this first pulse signal, and the 1Q terminal changes from level "0" to level "1".

This signal passes through the OR circuit 11d and changes the level from the level "0" to the level "1" at the CK terminal of the flip-flop 10d (7).

However, since the J- flip-flop 10d is set at the falling edge of the pulse signal, it does not perform any operation at this time.

Since pulse signals are applied to the first retrigger multivibrator 10a one after another at a cycle shorter than its operating time Trn1, the state is maintained during reproduction.

When the playback of the first song ends (Fig. 4), the magnetic tape becomes a no-signal area and the first re-multivib break 10a
Since the pulse signal is no longer applied to , when the last pulse signal falls and the operating time Tm1 has elapsed, the first re-multi-by-break 10a is restored and the IQ terminal is at the level "
1" to level "0" (t2 in the fourth diagram).

As a result, the flip-flop 10d is set to J-, and the Q terminal changes from level "1" to level "0".

Therefore, the third circuit connected to the output side of the AND circuit 11e
The 3A terminal of the retrigger multi-vibrator 10e is changed from level "1" to level "0" to operate the third retrigger multi-vibrator 10c.

As a result, the 3Q terminal becomes level "0", the output side of the AND circuit 11b becomes level "llo", and the flip-flop 10d is reset to J-.

As the flip-flop 10d is reset to J-, the Q terminal becomes level "1", and during this time a pulse signal (FIG. 4G) is generated, and the counter 11a's Cu
Added to the terminal.

As a result, the decoder 15, which had been at level "0" until now,
The a terminal of the terminal becomes the level "1", and the b terminal becomes the level "ON" instead.

As a result, the light emitting diode 16a that has been emitting light is turned off, and the light emitting diode 16b is emitted to indicate that the magnetic tape is about to start running the second track.

When the b terminal of the decoder 15 goes to level "O", it is inverted by the inverter 22b and one input terminal of the AND circuit 23b goes to level "1".

At this time, since the second song has not been selected, the 2Q terminal of the flip-flop 19b is at the level "0'', so the other input terminal of the AND circuit 23b is at the level "0".

Therefore, since the output terminal of the AND circuit 23b remains at the level "0", the output terminal of the buffer 6 is also set to the level "0" through the OR circuit 24.

This level "0" signal is applied to the fast-forward circuit 26 to bring it into a fast-forward state.

At the same time, the first retrigger multivibrator 10a
Since the 1B terminal of the second retrigger multivibrator 10b is set to level "0" and the 2B terminal of the second retrigger multivibrator 10b is set to level "1", the second retrigger multivibrator 10b is in the operating state in place of the first retrigger multivibrator 10a. be made into

As mentioned above, the fast-forward circuit 26 is set to the level "O"', but the reproducing circuit 25 is also set to the level "0" and maintains the operating state, so fast-forward playback is performed (the fourth
(from Figure 12).

The audio signal is then reproduced again at high speed by the magnetic head.

The reproduced audio signal is converted into a pulse signal by the signal conversion circuit 9 as described above and applied to the two terminals of the second re-trigger multivibrator 10b, which starts operating at the fall of the first pulse signal (the fourth Figure 13).

That is, 2 of the second retrigger multivibrator 10b
The 0 terminal changes from level "0" to level "1" (Fig. 4E).

This signal passes through the OR circuit 11d and sets the CK terminal of the flip-flop 10d to level "1".

This state continues as long as the aforementioned pulse signal is applied to the second re-trigger multivibrator 10b at a cycle shorter than its operating time Trn2 due to the fast-forward reproduction of the second song.

The operating time Tm2 is made shorter than the operating time Trn4 of the first re-trigger multi-by-break 10a so that no-signal portions can be detected accurately.

Fast-forwarding progresses and the signal portion of the second song ends.

Then, the operation is completed after the operation time Tm2 of the second re-trigger multi-by-break 10b has elapsed from the last fall of the second track of the pulse signal (A in FIG. 4) (ts in FIG. 4).

As a result, the 2Q terminal changes from level “1” to level “0”.
' (Fig. 4E).

This signal passes through the OR circuit 11d and changes the CK terminal of the flip-flop 10d from level "1" to level "0" to J'-.
’ and set.

In the same manner as described above, the signal G changes the output of the AND circuit 11c from the level "1" to the level "ON" and operates the third retrigger multivibrator 10c.

As a result, the 3Q terminal is turned from the level "1" to the level "ON", and this signal further passes through the AND circuit 11b, resets the flip-flop 10d to J-, and sets the Q terminal to the level "1" (see Fig. 4). G).

The pulse signal generated by resetting the flip-flop 10d to J- is applied to the Cu terminal of the counter circuit 14 and counts by one.

Then, the b terminal of the decoder 15 changes from the level "O" to the level "1"', and the C terminal changes from the level "1" to the level "0".
“becomes” (Figure 3 C).

As a result, the light emitting diode 16b goes out, the light emitting diode 16c lights up, and the magnetic tape finishes running the second song.
Displays that the third track is about to start.

The signal level of the C terminal is inverted by an inverter 22c and applied to one input terminal of an AND circuit 23c.

Since the storage device 19 was previously set to select the third song, the 3Q terminal is at level "1".

This signal also has a level "1" on the other side of the AND circuit 23c.
Since both the input terminals of the AND circuit 23c become level "1", the output terminal becomes level "1", and this signal passes through the OR circuit 24 and buffer 6 and sends the fast forward circuit 26 to level "1". “Because it is, fast-forward circuit 26
becomes inactive.

Then, from this time (FIG. 4, 1.), the system enters the playback state and plays the third song.

In this way, the pre-selected songs No. 1, No. 3, No. 6, and No. 9 are played in order, and the other songs are played in fast forward.

All of the memory circuit 3 in which the program music has been selected can be reset by turning on the desired music setting reset switch S3.

Further, if it is desired to return the display of a tape running position other than the first to the first, the tape running position reset switch S2 may be pressed and turned on.

By the way, for example, there is a long no-signal part between the end of the first song (t1 in Figure 5) and the beginning of the second song (17 in Figure 5), and as shown in Figure 5, there is a large noise near the middle of the no-signal part. etc., is recorded, the counter 14 may count even with this noise, causing a malfunction.

However, in the present invention, after the pulse signal is generated at the end of one song, the third re-trigger multivibrator 10c is opened for the operating time Tm3, and during this time the flip-flop 10c is reset to J-, so the malfunction occurs. There's nothing to do.

This will be explained in more detail with reference to FIG.

Now that the first track has finished running (Fig. 5, 11). The operating time T of the first re-trigger multivibrator 10a from the last pulse signal obtained by converting the audio signal by the signal conversion circuit 9
After ml, the 1Q terminal of the first re-multivibrator 10a changes from level "1" to level "0".

As a result, the flip-flop 10d is operated in J-, the third retrigger multi-bye break 10c is operated, and at the same time, a pulse signal is generated to cause the counter 14 to count.

As mentioned above, since the second song has not been selected, it is played in fast forward (FIG. 5, 12).

If noise is recorded between time t3 and time t4 after starting fast-forward playback, the second re-trigger multi-vib break 10b will operate from time t3.

This is because after the operating time Tm2 has elapsed since the fall of the last pulse signal of the digital signal A generated by noise, the signal E is changed from the level "1" to the level "O", and the CK terminal of the flip-flop 10d is set to the level "0". 1" to level "0"
Make it.

However, until the time (FIG. 5, 16), the operation time Trn3 of the third retrigger multivibrator 10c is within the J-
Since the flip-flop 10d is in the reset state, it is never set.

Therefore, no count pulse signal is generated.

As described above, the automatic music selection device for a tape recorder of the present invention includes a first no-signal detector that generates a signal when a no-signal portion is detected, and a second no-signal detector that has a longer operating time than the first no-signal detector. a no-signal detector and a second no-signal detector operated by the output signal of the first no-signal detector, the operating time of the second no-signal detector being at least forced to operate; Since a control circuit that is inactive is provided, an erroneous counter pulse signal will not be generated even if a noise signal is recorded on an unrecorded portion of the magnetic tape.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an automatic music selection device for a tape recorder according to the present invention, Fig. 2 is a circuit diagram of the main parts of Fig. 1, and Figs. This is a timing chart. 1... No-signal detection circuit, 2... Counting circuit, 3... Memory circuit, 4... Gate circuit group, 10a, 10b. 10c...Re-trigger monostable multi-bi break, 10d...Flip-flop on J-, 14.
...Counter, 15 ...Decoder, 19
...Storage device, 27...1 o'clock stop switch.

Claims (1)

[Claims] 1. A first no-signal detector that detects a no-signal portion between audio signals recorded on a magnetic tape, and a second no-signal detector that has a shorter operating time than the first no-signal detector. , a control circuit that is operated by the output signal of the first no-signal detector, operates a second no-signal detector thereby, and is forced to be inactive at least during the operating time of the second no-signal detector; , a counting circuit that counts the signals controlled by the control circuit and counts the unrecorded portions passing through the magnetic head, and a storage circuit that can set a plurality of desired signal positions for reproduction of the audio signal recorded on the magnetic tape at once. An automatic music selection device for a tape recorder, comprising: a gate circuit for comparing the output signals of the storage circuit and the counting circuit; and a fast-forward or rewind circuit controlled by the output signal of the gate circuit.