JPS5835410B2 - Tuning pulse generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuning pulse generator arrangement for manually supplying tuning pulses to an electronically tuned receiver.

With the rapid development of electronic technology, receivers have also been improved in various ways. In recent years, receivers have been equipped with a pulse generator that generates up or down pulses by manual operation, and the output of this pulse generator is counted by an up/down counter. An electronic tuning reception system is used in which tuning is performed by converting the output into analog form and supplying it as a tuning voltage to a variable capacitance diode in a tuning section.

In this case, the pulse generator uses a disc with many slits that rotates in conjunction with the rotation of the tuning knob in order to obtain the same operational feeling as the conventional tuning operation using a variable capacitor and U-coil. The light that passes through the slit provided in this disc is received by two light emitting diodes installed slightly shifted in the direction of rotation, and up and down pulses are generated using the output generation relationship of both light receiving elements. and generating clock pulses.

However, since the tuning pulse generator with the above-mentioned configuration is configured to generate clock pulses corresponding to the amount of rotation of the rotating disk, it provides the same operational feeling as when using a conventional variable capacitor. On the other hand, if there is a large amount of movement between stations due to channel selection, the knob must be turned many times, making the operation complicated.

Further, since the above-mentioned tuning pulse generating device has a mechanical configuration, the device is large in size, which is also disadvantageous in terms of space efficiency.

Therefore, an object of the present invention is to provide an electronic tuning pulse generator that allows coarse and fine adjustments to be easily made by simply selecting and operating buttons.

This will be explained in detail below using the drawings. The figure is a circuit diagram showing an embodiment of the tuning pulse generator according to the present invention. 5 is a capacitor connected between the collector of the first transistor 1 and the base of the second transistor; 6 is the capacitor connected between the base of the first transistor 1 and the collector of the second transistor 3; 7 is a resistor connected between the base of the second transistor 3 and the power supply +V, 8 and 9 are resistors connected in series between the base of the first transistor 1 and the power supply +■, These constitute an unstable multi-by-break 10.

11 is the up high button, 12 is the up low button, 1
3 is the down low button, 14 is the down high button, 15
A to 15d are direction detection switches respectively linked to the buttons 11 to 14, and when the up hypokun 11 and the up low button 12 are operated, the power supply +■ is supplied to the output terminal 18 as an up signal Hl+, and the down low button is activated. 13 and the down hypokun 14 are operated, the output terminal 18 is set to the ground potential.

Speed control switches 16a to 16e are respectively linked to the buttons 11 to 14, and are connected to short-circuit both ends of the resistor 8 when the up-high button 11 and the down-high button 14 are operated.

172-17d are tuning pulse switches respectively linked to buttons 11-14;
4 is operated, the oscillation output of the multi-by-break 10 is supplied to the output terminal 19 as a tuning pulse.

In the tuning pulse generator configured in this way, for example, when the button 11 is operated, the switch 15a
, 16a, 17a are closed.

When the switch 15a is closed, the power supply +■ is sent out and the up signal tv Ht+ is sent out to the output terminal 18.

In addition, the resistance 8 is
Both ends of are shorted, which causes multi-bye break 1
The resistance value of the resistor that determines the 0 oscillation period decreases, generating a high frequency pulse output.

Further, by closing the switch 17a, the high oscillation frequency pulse output of the multi-by-break 10 is sent to the output terminal 19 as a tuning pulse.

Therefore, the up/down counter (not shown) of the electronic tuning section receives the up signal 91 H1 supplied from the output terminal 18.
1, the tuning pulses supplied from the output terminal 19 are up-counted, and the count output is used to move the tuning toward the higher reception frequency side at high speed.

Next, when the button 12 is operated, the switches 15b and 16
b, 1γb is closed.

In this case, the up signal "H'" is output to the output terminal 18 by the closing operation of the switch 15b, and the output terminal 19
When the switch 17b is closed, the output of the multi-by-break 10 is supplied as a tuning pulse.

However, in this case, since the switch 16b is not connected (freak), both ends of the resistor 8 are not short-circuited, and as a result, the resistance value that determines the oscillation period increases, and the oscillation period of the multi-vib break 10 decreases. As a result, the frequency of the tuning pulse sent from the output terminal 19 becomes lower, and accordingly, the tuning movement in the upward direction becomes slower, making it suitable for fine tuning.

When the target reception frequency is reached, the switch 17b is opened by releasing the button 12 and the transmission of the tuning pulse is stopped, thereby fixing the channel selection.

Next, when the button 13 is operated, a down signal n L It is output to the output terminal 18, and a low-speed tuning pulse is output from the output terminal 19 in the same manner as described above.

Further, when the button 14 is operated, the switch 15d closes and the down signal e+L+1 is sent out from the output terminal 18, and a high-speed tuning pulse is sent out from the output terminal 19 in the same manner as described above.

As explained above, according to the present invention, low-speed and high-speed tuning pulses and up/down pulses can be easily generated by the electronic circuit, and along with this, coarse adjustment and fine adjustment can be easily performed. In addition, it has various excellent effects such as making the device smaller.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a tuning pulse generating circuit according to the present invention. 1.3...First and second transistors, 2,4゜7.8,9...Resistor, 5,6...Capacitor, 10...・Unstable multi-bye break,
11-14...Button, 15a-15d...
...Direction detection switch, 16a-16e...Speed control switch, 17a-17d...
...Tuning pulse switch, 18, 19...
...Output terminal.

Claims (1)

[Claims] 1 Unstable multi-by-break, up-high button, unlow button, down-low button, down-high button, outputs an up signal in conjunction with each of the above buttons when the up-high button or up-low button is operated, and A direction detection switch that sends a down signal in conjunction with each of the above buttons when the down low button or down high button is operated, and determines the oscillation cycle of the unstable multi-bye break when the up high button or down high button is operated. A tuning pulse generator equipped with a speed control switch that changes the resistance value to be used, and a tuning pulse switch that outputs the oscillation output of an unstable multi-by-break as a tuning pulse when any of the buttons is operated.