JPS593043B2 - Electronic tuning receiver preset display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a preset display device/apparatus for indicating that preset is reliably performed in an electronically tuned receiver.

In recent years, with the rapid development of electronic technology, receivers that can perform electronic preset tuning have been proposed.

This preset receiver addresses the memory using the outputs of the band select switch and channel select switch, reads out the band and channel signals preset at the addressed memory address, and sets them in the up/down counter for manual setting. , and is configured to receive radio waves of a preset desired band and channel by converting the output into an analog signal and supplying the analog signal to a variable capacitance diode constituting a tuning circuit.

In this case, the above-mentioned channel select switch is configured by a non-lock type switch, for example, and the band select switch is configured by a rotary switch, and the channel select signal output from this channel select switch and the band select switch The memory output is read into an up/down counter and controlled every time a band select signal outputted from the up/down counter is detected.

In the electronically tuned receiver configured in this way, the receiving station can be preset by selecting and closing the channel select switch while the preset switch is closed. If it does not close due to insufficient pressure,
This information is no longer written to the memory, resulting in an incomplete preset operation (memory operation).

This invention has been made to eliminate the above-mentioned drawbacks, and each time preset data is written into a memory, a display element is turned on to display a display.

Hereinafter, it will be explained in detail using the drawings. The figure is a block diagram showing one embodiment of a preset display device for an electronically tuned receiver according to the present invention. In the figure, reference numeral 1 indicates a pulse that selectively generates an up pulse U or a town pulse D and a clock pulse KC by manual operation. Generator, 2 is a binary up/down counter that receives up/down pulses U and clock pulses KC from pulse generator 1, and counts clock pulses KC based on up/down pulses U/D; 3 is an up/down counter;・Down counter 2
A frequency display 4 performs digital display by inputting the upper few bits of the count output of the oscillation signal. A pulse synthesizer 5 which obtains a serial pulse train of the number of pulses corresponding to the output of the down counter 2 is a low-pass filter, and together with the pulse synthesizer 4 constitutes a DA converter.

Reference numeral 6 denotes a band select switch that selects a band by switching and supplying the direct current output of the low-pass filter 5 to a tuning circuit (not shown), and fixed contacts a to C are in charge of bands A to C, respectively.

Reference numerals 7a to 7e designate channel select switches constituted by non-locking type switches, 8 a band select switch having fixed contacts a to c in charge of bands A to C, and this band select switch 8 and the band select switch 6 are linked.

Is 9 the channel select switch? A lead that stores the output of the up/down counter 2 at the address specified by the output of a to 7e and the band select switch 8, or reads out the contents stored at the specified address and supplies it to the up/down counter 2. - The write memory 10 receives the outputs of the channel select switches 1a to γe and the outputs of the band select switch 8 as inputs, and when the preset switch 11 is off, the up/down counter 2 is activated when the output of the channel select switches γa to 7e occurs. 12 is an OR gate that takes out the OR output of each channel select switch 7a to 1e, and 13 is a D type control circuit. A flip-flop,
This flip-flop 13 converts the output of the OR gate 12 into C
A write pulse W is supplied to the K input terminal, the D input terminal is connected to ground, and the write pulse W supplied from the control circuit 10 to the read/write memory 9 is used as a set input.

14 is a flip-flop 1 supplied via a resistor 15.
A transistor that is turned on by the set output Q of 3, 1
Reference numeral 6 denotes a light emitting diode connected between the power supply +V and the ground via the transistor 14 and the protective resistor 11, which indicates the completion of presetting.

In the electronically tuned receiver configured in this manner, when the pulse generator 1 is operated (rotated) to generate, for example, a clock pulse KC and an up pulse U, these two pulses are supplied to the up/down counter 2. .

The up/down counter 2 sequentially counts up the clock pulse KC in accordance with the up pulse U.

The parallel output of the up/down counter 2 is supplied to a pulse synthesizer 4, where the signals of each stage, which are frequency-divided oscillation signals corresponding to the output of the up/down counter 2, are selectively synthesized to produce the corresponding number of pulses. is converted into a serial pulse train.

The output signal of the pulse synthesizer 4 has high frequency components removed in a low-pass filter 5, and becomes a DC voltage signal corresponding to the output of the up/down counter 2.

This DC voltage signal is applied to a variable capacitance diode of a tuning circuit (not shown) selected by the band select switch 6, and the corresponding frequency is tuned.

Further, the upper bit signal of the up/down counter 2 is supplied to a frequency display 3, where the frequency being received is digitally displayed.

The above explanation is an explanation of the operation during manual operation.

Next, the case of presetting a desired broadcast station will be explained.

With the desired station selected by the method described above, first turn on the preset switch 11, then turn on any of the channel select switches 7a'' to 7e corresponding to the channel you want to preset, and then the control circuit 10 sends a read signal. - The write pulse W is supplied to the write memory 9, and the count output of the up/down counter 2, that is, the count output of the up/down counter 2, that is, the reception The digital signal on which the tuning frequency is based can be stored.

In this way, desired frequencies are preset for other channels as well.

In this case, each channel select switch 1a to 7e becomes ``H'' when the button is pressed, and the D-type flip-flop 13 sends an OR output using the output of each channel select switch 7a to 7e as input. The output of the OR gate 12 is used as a clock input, and the state of zero power is taken in by the falling edge of the clock power CK.

Therefore, in the normal state, the output of each channel select switch 7a to 1e is L'', and accordingly, the set output Q of the flip-flop 130 is also ttLjj, and the light emitting diode with this set output Q as the base input The driving transistor 14 is turned off and the light emitting diode 16 is not lit.

Next, when the preset switch 11 and any of the channel select switches 1a to 1e are reliably operated and both switches are closed, a write pulse W is sent from the control circuit 10 to the read/write memory 9 and the up/down counter 2 The count output is memorized.

In this case, the write pulse W is supplied to the set input terminal of the flip-flop 130, so that the set output Q of the Noribu-flop 13 becomes 11H'' regardless of the state of the clock CK.

As a result, the transistor 14 is turned on and the light emitting diode 16 lights up, indicating that the preset has been reliably performed.

When the channel select switches 1a to 1e, which are non-locking switches, are released, the clock CK supplied via the OR gate 12 changes from 1H''' to L, and at this fall, the flip-flop 13 is reset and emits light. Diode 16 turns off.

Next, if the operation of the preset switch 11 or the channel select switches 7a to 7e is incomplete, the control circuit 10 does not send out the write pulse W, so the control flop 13 is not set. Therefore, the light emitting diode 16 does not light up.

In this case, channel select switches 1a to 7
A clock signal is given to the Noritsubu flop 13 by the rising output of e, but the D input is connected to ground and the L
uLjJ, the set output Q never becomes H'', and accordingly, the light emitting diode 16
does not light up.

Next, when performing preset tuning, select the address where the digital signal corresponding to the desired station is stored between the band select switch 8 and the channel select switch. a”-
7e.

When such an operation is performed, since the preset switch 11 is off, the control circuit 10 supplies a load signal to the up/down counter 2.

As a result, the readout signals of the read/write memory 9, which read out the outputs of the band select switch 8 and channel select switches 1a to 7e as addresses, are read in parallel to the up/down counter 2, and the output is supplied to the digital synthesizer 4. Then, the same channel selection operation as in manual operation is performed.

From now on, to change the preset selection within the same band, it is only necessary to selectively turn on the channel select switches 7a to 1e, and if the bands are different, after switching the band select switch 8, change the channel select switches 1a to 1e. All you have to do is operate 1e.

In this case, the channel select switch 7a = 7e is operated during preset tuning as well, but since the preset switch 11 is off, the light pulse W is not sent out, and as a result, the flip-flop 13 is not set, so no light is emitted. The diode 16 continues to remain non-lit.

As explained above, according to the present invention, the light emitting diode can be turned on only when the preset (storage) to the memory has been performed reliably, so that it can be confirmed whether the preset operation has been reliably performed. This has an excellent effect of preventing preset errors caused by incomplete switch operations.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of a preset display device for an electronically tuned receiver according to the present invention. 1...Pulse generator, 2...Up...
Down counter, 3... Frequency display, 4...
...Pulse synthesizer, 5...Low pass filter, 6.8...Band select switch, 9...Read/write memo 1c10...
...Control unit, 11...Preset switch, 1
2...OR gate, 13...Flip-flop, 14...Transistor, 16...
・・・Light emitting diode

Claims (1)

[Claims] 1. An up/down counter whose up/down counts are controlled by manual operation, means for tuning the receiver by the count output of this up/down counter, and up/down counters that are addressed by a band select switch and a plurality of channel select switches. - Read/write memory that stores the count output of the down counter and sends read information to the up/down counter, and controls read/write memory and up/down by the outputs of the preset switch, channel select switch, and band select switch. - In an electronic tuning receiver equipped with a control unit that controls the acquisition of read/write memory outputs to a down counter, a write control signal is sent from the control unit to the read/write memory while the channel select switch is being operated. 1. A preset display device for an electronically tuned receiver, characterized by being provided with a display element that lights up only at certain times.