JPH0135357Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic music selection device for a tape recorder, which is capable of automatically selecting a desired song by detecting the interval between songs when playing a tape cassette in which a plurality of songs are sequentially recorded, for example. In particular, it is possible to set a desired song even when the tape recorder is stopped.

Conventionally, an automatic music selection device for a tape recorder has been proposed, as shown in Fig. 1, which is capable of automatically selecting a desired song by detecting the interval between songs when playing back a tape cassette on which a plurality of songs are sequentially recorded. It had been. That is, in FIG. 1, reference numeral 1 indicates a power supply terminal to which DC voltage from a battery or the like is supplied, and this power supply terminal 1 is connected to a movable contact 2a of a power switch 2, and is used for playback, fast forwarding, etc. of a tape recorder. It is connected to one contact 3a of the leaf switch 3 which is turned on in the rewinding state, and the fixed contact 2b of this power switch 2 and the other contact 3 of the leaf switch 3 are connected.
b are connected to respective power supply terminals of an automatic music selection circuit 5 having a counter 4 for setting a desired music piece and a music interval detection circuit. Reference numeral 6 indicates a program switch for specifying a desired song, which is composed of an automatic return type connection switch, and one end of the program switch 6 is connected to the fixed contact 2b of the power switch 2 and the other contact 3b of the leaf switch 3. When power is supplied, this program switch 6
A count signal is supplied to the counter 4 each time the program switch 6 is turned on, and a desired song can be designated by the number of times the program switch 6 is turned on. The count output signal of this counter 4 is supplied to an automatic music selection circuit 5, and this automatic music selection circuit 5 detects the interval between songs recorded on the cassette tape, and calculates the number of detected intervals and this counter 4.
When the count output signals match, the tape recorder is put into play mode and the song corresponding to the match is played.

In such a conventional automatic music selection device for a tape recorder, when the power switch 2 is on, the tape recorder is in playback, fast forwarding, or rewinding mode, and the leaf switch 3 is on, the program switch 6 selects the desired song. You can set the song and automatically select the desired song.

However, it is generally required to set the desired song when the tape recorder is in a stopped state, but in this stopped state, both the power switch 2 and the leaf switch 3 are off, and the program switch 6 must be operated. However, there was an inconvenience in that the counter 4 etc. did not operate, making it impossible to set the desired song.

In view of this, the present invention is designed to enable a desired music piece to be easily set even when the tape recorder is stopped.

An embodiment of the automatic music selection device for the tape recorder of the present invention will be described below with reference to FIG.
In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 2, the power supply terminal 1 is connected to the count signal input terminal of the counter 4 via the program switch 6, and the connection point between the program switch 6 and the count signal input terminal constitutes a backflow prevention and rectification circuit. It is connected to the anode of a diode 7, the cathode of this diode 7 is grounded via a smoothing capacitor 8, and the cathode of this diode 7 is connected via a resistor 9 to the base of an npn transistor 10. In this case, the discharge time constant of the capacitor 8 and resistor 9 is set to a predetermined time, for example, about 1 minute. The emitter of this transistor 10 is grounded, the collector of this transistor 10 is connected via a resistor 11 to the base of a pnp type transistor 12 constituting a switching element, the emitter of this transistor 12 is connected to the power supply terminal 1, and this The collector of the transistor 12 is connected to the power supply terminals of the counter 4 and the automatic music selection circuit 5, respectively. Also, connect the power terminal 1 to one contact 3a of the leaf switch 3, and
The other contact 3b is connected to a diode 13 for backflow prevention.
It is connected to the power supply terminals of the counter 4 and the automatic music selection circuit 5 through the respective power supply terminals. The rest of the structure is the same as a conventional tape recorder.

Since Figure 2 is configured as described above, playback,
During fast forwarding or rewinding, the leaf switch 3 is turned on, so power is supplied to the counter 4 and the automatic music selection circuit 5, respectively, and the desired music can be set using the program switch 6 in the same manner as before. At the same time, automatic song selection can be performed.
Furthermore, even if the tape recorder is stopped and the leaf switch 3 is off, the capacitor 8 is charged via the diode 7 by turning on the program switch 6, and the electric charge charged in the capacitor 8 is transferred to the resistor. Since the transistor 10 is discharged through the base-emitter of the transistor 9 and the transistor 10, the transistor 10 becomes conductive for a time determined by the capacitor 8 and the resistor 9.
0 becomes conductive, the transistor 12 becomes conductive, and during this time the power from the power supply terminal 1 is supplied to the respective power supply terminals of the counter 4 and the automatic music selection circuit 5 through this transistor 12, so the counter 4 is in the operating state. Then, program switch 6
The counter 4 can be used to count the number of ON operations, and a desired song can be set using the counter 4. That is, even when the tape recorder is stopped, a desired song can be set according to a request, and when the tape recorder is put into operation after setting, the automatic song selection circuit 5 is activated, and the desired song that has been set is automatically selected. , this is played.

As described above, according to the present invention, power is supplied to the counter 4 for a predetermined period of time by turning on the program switch 6 even when the tape recorder is stopped. A desired song can be set, which has the advantage of improving usability.

Further, FIG. 3 shows another embodiment of the present invention, in which the power supply control circuit 14 is constructed by a negative logic circuit. To explain this Fig. 3, parts corresponding to Fig. 2 are given the same reference numerals,
A detailed explanation thereof will be omitted. In FIG. 3, the connection point between the program switch 6 and the counter signal input terminal of the counter 4 is connected via an inverter circuit 14a to the set terminal of a flip-flop circuit constituted by NAND circuits 14b and 14c. The Q output terminal is connected to one input terminal of the NAND circuit 14f via the inverter circuit 14d, and the NAND circuit 14f
The output terminal of transistor 1 is connected via resistor 15 to transistor 1.
0, and this inverter circuit 14d
The output terminal of the inverter circuit 14g is grounded through a series circuit of a resistor 16 and a capacitor 8 that constitute a time constant circuit. 17 is a diode for rapid discharge connected in parallel to the resistor 16. The connection point of this resistor 16 and capacitor 8 is connected to NAND circuits 14b and 14 through an inverter circuit 14h.
Connect to the reset terminal of the flip-flop circuit constituted by c. Further, the other contact 3b of the leaf switch 3 is connected to the other input terminal of the NAND circuit 14f via the inverter circuit 14i. In addition, the collector of the transistor 12 is connected to the power supply control circuit 1.
4, and the connection point of the program switch 6 and the count signal input terminal of the counter 4 is connected to this power supply terminal 14v via a backflow prevention diode 18. . The rest of the structure is the same as in FIG. 2.

In FIG. 3, when the leaf switch 3 is on, the output side of the inverter circuit 14i becomes a low level "0", and the output side of the NAND circuit 14f becomes a high level "1", and the transistor 10
becomes conductive, and as this transistor 10 becomes conductive, the transistor 12 becomes conductive, and the power from the power supply terminal 1 is supplied to the respective power supply terminals of the counter 4 and the automatic music selection circuit 5. is in the operating state. Therefore, at this time, the operation is similar to that shown in FIG.

Furthermore, when the tape recorder is in a stopped state and the leaf switch 3 is off, when the program switch 6 is turned on, a count signal is supplied to the count signal input terminal of the counter 4 according to the number of operations, and this program When the switch 6 is on, the voltage from the power supply terminal 1 is supplied to the power supply terminal 14v via the diode 18, and is also supplied to the set terminals of the flip-flop circuits 14b and 14c via the inverter circuit 14a. The Q output terminal becomes high level "1" and the transistor 10 becomes conductive, therefore,
Transistor 12 becomes conductive, and at this time power supply terminal 1
More power is supplied to the counter 4, the counter 4 enters an operating state, and a desired music piece can be set. Also, from the moment the Q output terminals of the flip-flop circuits 14b and 14c reach the high level "1", charging of the capacitor 8 starts via the resistor 16, and the charging voltage of the capacitor 8 becomes the threshold voltage of the inverter circuit 14h. When the voltage becomes higher, that is, at a predetermined time determined by the resistor 16 and the capacitor 8, the output side of the inverter circuit 14h becomes low level "0" and the flip-flop circuits 14b, 14
A reset signal is supplied to the reset terminal of Q.
The output terminal becomes low level "0", the transistor 10 becomes non-conductive, the transistor 12 becomes non-conductive, and the supply of power is stopped. The rest operates in the same manner as in FIG.

Therefore, it is easy to understand that the example shown in FIG. 3 provides the same effects as the example shown in FIG.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations may be adopted without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an automatic music selection device for a conventional tape recorder, FIG. 2 is a construction diagram showing an example of an automatic music selection device for a tape recorder according to the present invention, and FIG.
The figure is a configuration diagram showing another embodiment of the present invention. 1 is a power supply terminal, 3 is a leaf switch, 4 is a counter, 5 is an automatic music selection circuit, 6 is a program switch, 7 is a diode, 8 is a capacitor, 9 is a resistor, and 10 and 12 are transistors, respectively.

Claims (1)

[Scope of utility model registration request] It has a song interval detection circuit having a counter section and a switch for setting a desired song, and when the switch is turned on, a count signal is supplied to the counter section and at least power is supplied to the counter section. An automatic music selection device for a tape recorder characterized by the following.