JPH0113461Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention relates to an improvement of a preset receiver, and is particularly devised so that the operator can easily distinguish the operating status of the preset receiver. The present invention relates to a preset receiver equipped with a display mechanism.

(b) Prior Art A preset receiver is known in which broadcast stations are preset on a preset channel, and when a preset button is pressed, the receiver receives the station preset on the corresponding preset channel. However, in such a preset receiver,
This has the disadvantage that a preset button must be pressed each time the receiving station is changed, making the operation cumbersome. There is also a known preset receiver called preset search, which selects preset channels in sequence by pressing a preset search button and automatically switches to and receives the preset stations. The receiver is equipped with a preset search button and a preset search stop button, and a large number of buttons must be arranged on the front panel of the preset receiver, which has the drawback of being prone to erroneous operation.

(c) Purpose of the invention The present invention has been made in view of the above points, and aims to provide a preset receiver that is easy to operate and has an easy-to-see operation display mechanism.

(d) Structure of the invention The preset receiver according to the invention starts a preset search by pressing the band selection button corresponding to the band in the selected state, and displays the preset channel in the reception state during the preset search. The display element blinks for a few seconds to indicate that the preset search is in progress, and when the desired station is received, press the preset button of the preset channel to which the desired station is preset, and the button remains blinking. The display element is turned on and the preset search is stopped.

(E) Embodiment Figure 1 is a front view showing an example of the external appearance of a preset receiver according to the present invention, in which 1 is a display section for displaying the reception frequency, and 2 is a first band for selecting an FM band. Selection buttons, 3 is the second band selection button for selecting the AM band, 4 to 11 are the first to eighth preset channels to select the first to eighth preset channels.
This is a preset button. The first band selection button 2, the second band selection button 3, and the first to eighth preset buttons 4 to 11 are comprised of self-illuminated push leads, and when the push button is pressed, it lights up. It is designed to indicate that it has been pressed.

FIG. 2 is a circuit block diagram showing an embodiment of the internal circuit of the present invention, in which reference numeral 12 indicates an antenna 13, a radio frequency amplification stage 14, a mixing stage 15, and a local oscillation stage 1.
6, an FM tuner unit consisting of an intermediate frequency amplification stage 17 and a detection stage 18; 19, an AM tuner unit consisting of an antenna 20, a radio frequency amplification stage 21, a mixing stage 22, and a local oscillation stage 23; 24; is mentioned above
The oscillation frequency of the local oscillation stage 16 of the FM tuner section 12 and the local oscillation stage 23 of the AM tuner section 19
A PLL (phase locked loop) circuit for setting the oscillation frequency of the PLL circuit 24, 25 a selection signal generation circuit for generating a selection signal for sequentially selecting preset channels of the PLL circuit 24, and 26 a selection signal generation circuit for sequentially selecting the preset channels of the PLL circuit 24.
a preset circuit that generates a press signal in response to the press of a preset button for manually selecting a preset channel in the circuit 24; 27 a plurality of display elements for displaying the selected preset channel;
28 is a display drive circuit that switches and drives the display element 27 to a blinking display state or a lighting display state; 29 is a band circuit that generates a press signal in response to the press of a band selection button for band selection; 30 is the band a control circuit for controlling the operation of the selection signal generation circuit 25 in response to a press signal from the circuit 29;
1 is a stop circuit that generates a stop signal for stopping the sequential selection operation of preset channels when the preset button is pressed, and 32 is the control circuit 3.
This is a switching circuit that generates a switching signal for switching the display state of the display drive circuit 28 in accordance with the operation of the display drive circuit 28.

Next, the general operation of the preset receiver according to the present invention will be explained based on FIGS. 1 and 2. If the preset receiver is receiving the first preset channel of the FM band, the self-illuminated first band selection button 2 corresponding to the FM band lights up, and the self-illuminated first preset button 4 lights up. It's lit. In this state, when the lit first band selection button 2 is pressed, a start signal is generated from the control circuit 30 in response to a press signal from the band circuit 29, and the selection signal generation circuit 25 starts operating. At the same time, from the control circuit 30 to the switching circuit 32
A control signal is also applied to the display drive circuit 28, and the display driving circuit 28 enters a blinking display state in response to the switching signal from the switching circuit 32, and the first preset button 4 enters a blinking display state. After the start signal is applied to the selection signal generation circuit 25, the selection signal generation circuit 25 generates a signal from its eight output terminals.
Pulse signals are sequentially generated to eight preset input/output terminals of the PLL circuit 24 at predetermined intervals. for example,
If the pulse signal occurs at 4 second intervals,
Four seconds after the first preset button 4 starts blinking, a pulse signal is generated from the second output terminal of the selection signal generating circuit 25, the first preset button 4 goes out, and the second preset button 5 starts blinking. second
Stations preset on the preset channel are received. After that, the selection signal generation circuit 25
As the output pulses of the third
The to 8th channel buttons 6 to 11 flash in sequence,
Stations preset to the third to eighth preset channels are sequentially received. After the station preset on the eighth preset channel is received for four seconds, the station preset on the first preset channel is received again, and this process is repeated.

Next, the receiving operation of the desired station will be explained. For example, if it is desired to continue receiving the station preset to the fourth preset channel selected by the above-described sequential selection operation, the fourth preset button 7, which is in a blinking state, may be pressed. Then, in response to the press, a control signal is generated from the preset circuit 26, which is applied to the stop circuit 31, so that a stop signal is generated from the stop circuit 31, and the stop signal is applied to the control circuit 30, and the selection is made. The operation of the signal generation circuit 25 is stopped, and the switching circuit 32 is activated to bring the display drive circuit 28 into the lighting display state. Therefore, the PLL circuit 24 maintains the reception state of the station preset to the fourth preset channel, and the FM tuner section 12 continues to receive the station, and the fourth preset button 7 lights up to display reception. conduct. To perform the sequential channel selection operation again in this receiving state, the first band selection button 2 may be pressed, and the same operation is repeated thereafter.

Next, details of each block of the circuit shown in FIG. 2 will be explained. FIG. 3 is a circuit block diagram showing an example of the PLL circuit 24 in FIG. 2, where 33 is an address circuit having eight input/output terminals 34 to 41 and for specifying a memory address, and 42 is an address circuit for specifying the address. A memory comprising a plurality of addresses specified by the circuit 33, 43 a read counter for reading out information stored at the specified address of the memory 42, and 44 a programmable divider to which information in the read counter 43 is set. , 45 is the output signal of the programmable divider 44 and the reference oscillator 4
a phase comparator that detects the phase difference with the output signal of No. 6;
47 is a VCO (voltage controlled oscillator) that oscillates at a frequency according to the output signal of the phase comparator 45; and 48
is a switching circuit for switching the address circuit 33 to the FM or AM state in response to a push signal generated from the band circuit 29 in response to the push of the first and second band selection buttons 2 and 3. The FM band is currently selected by the switching circuit 48, and when a pulse signal from the selection signal generation circuit 25 is applied to one of the first to eighth input/output terminals 34 to 41 in this state, the address circuit 33 selects the FM band. a memory 4 corresponding to the input/output terminal to which the pulse signal is applied;
2 is specified, information corresponding to the station stored at the address is read out to the read counter 43, and the information read out to the read counter 43 is set in the programmable divider 44. Programmable divider 44, phase comparator 4
5. Since the reference oscillator 46 and the VCO 47 constitute a PLL loop, the output signal frequency of the VCO 47 becomes a local oscillation frequency corresponding to the station stored in the memory 42, and the FM tuner 12 receives the station. I can do it. In that case, VCO4
7 corresponds to the local oscillation stage 16 in FIG. 2, and the output signal of the VCO 47 obtained at the output terminal 49 is applied to the mixing stage 15 as a local oscillation signal. Since the PLL circuit shown in FIG. 3 is well known, detailed operation thereof will be omitted.

FIG. 4 is a circuit block diagram showing an example of the selection signal generation circuit 25 shown in FIG. An interface circuit with the circuit 24 and a clock circuit 52 for generating a clock signal for the counter 50 are provided. When a start signal is applied from the control circuit 30 to the input terminal 53, a clock signal is generated from the clock circuit 52, and the counter 50 starts counting in response. Therefore, if the output terminal of the counter 50 is set to the initial value "00000001", by using the clock signal as a count, "1" can be sequentially transferred to the adjacent bit, and the interface To the output terminals 54 to 61 of the ace circuit 51,
Eight signals from "00000001" to "10000000" can be obtained. By adjusting the frequency of the clock signal, the reception time per station in the sequential channel selection operation can be arbitrarily set. 62
is an inverter for creating a clear signal to clear the contents of the counter 50, and the start signal changes from "H" to "L" by the action of the stop circuit 31.
This is provided to clear the contents of the counter 50 when the clock circuit 52 stops operating.

FIG. 5 shows an example of the control circuit 30 in FIG. 2, where 63 is a first band circuit that generates a signal in response to pressing the first band selection button for selecting the FM band, and 64 is an AM band circuit. 2nd to select the band
A second button that generates a signal in response to the press of the band selection button.
A band circuit, 65 is a first output terminal for applying information informing the PLL circuit 24 that the FM band has been selected, and 66 is a first output terminal for applying information informing the PLL circuit 24 that the AM band has been selected. , 67 and 68 are first and second one-shot multivibrators, 69 and 70 are first and second delay circuits, 71 and 72 are first and second AND circuits, 73 is OR circuit, 74 is a flip-flop circuit, and 75 is a third output terminal for applying a start signal to the input terminal 53 in FIG. Incidentally, the flip-flop circuit 74 is initialized so that "L" is generated at the third output terminal 75.

If the FM band is currently being received at time _t1 , the first output terminal 6
5 is "H", the second output terminal 66 is "L", and the third output terminal 75 is as shown in FIG.
It is marked "L". When the first band selection button 2 is pressed at time _t2 , a pulse is generated at the output terminal of the first one-shot multivibrator 67 as shown in FIG. 6E, and the output of the first AND circuit 71 becomes "H". The output of the OR circuit 73 also becomes "H" and a trigger signal is applied to the flip-flop circuit 74.
An “H” signal serving as a start signal is generated at the third output terminal 75. Since the start signal "H" of the third output terminal 75 is applied to the input terminal 53 of FIG. 4, the selection signal generation circuit 2 for sequential selection is applied.
5 starts operating. When a desired station is found and the desired station presses the preset button of the preset channel, a stop signal is generated from the stop circuit 31 and applied to the terminal 76, so that the flip-flop circuit 74 is inverted. , 3rd
The signal at the output terminal 75 becomes "L" and the operation of the selection signal generating circuit 25 is stopped. Furthermore, when a desired station is found instead of pressing the preset button and the first band selection button 2 is pressed again at time _t3 , a pulse is generated from the first one-shot multivibrator 67 and the first AND circuit 71 is pressed. The output of the OR circuit 73 becomes "H", the flip-flop circuit 74 is inverted, and the output of the third output terminal 7 becomes "H".
5 becomes "L", the operation of the selection signal generation circuit 25 is stopped.

While receiving the FM band, when the second band selection button 3 is pressed to select the AM band at time _t4 , the second output terminal 66 becomes "H" and the first output terminal 65 becomes "L". As shown in FIG. 6, a pulse is generated at the output terminal of the second one-shot multivibrator 68, and the second AND circuit
One of the input terminals becomes "H". However, since the signal "H" at the second output terminal 66 is delayed by the time T in the second delay circuit 70 as shown in FIG. 6D, the other input terminal of the second AND circuit 72 is "H". Therefore, the output of the second AND circuit 72 remains "I", the output of the OR circuit 72 also maintains "L", and the flip-flop circuit 74 is not inverted.
Therefore, by pressing the second band selection button 3 for the first time, the band can be switched and the station preset to the first preset channel of the AM band can be received. Will not start. When the second band selection button 3 is pressed again at time _t5 , the second one-shot multivibrator 68
The output of the second AND circuit 72 becomes "H", the output of the OR circuit 73 also becomes "H", the flip-flop circuit 74 is inverted, and the start signal "H" is sent to the third output terminal 75. occurs. time
If you press the second band selection button 3 again at t ₆ , the third
The output terminal 75 becomes "L" and the sequential selection operation stops.

Furthermore, during AM band reception, at time t ₇
When the first band selection button 2 is pressed to select the FM band, the first output terminal 65 becomes "H" and the second output terminal 66 becomes "L", and the output terminal of the first one-shot multivibrator 67 becomes "H". A pulse is generated. However, as shown in FIG. 6C, the other input of the first AND circuit 71 does not become "H" due to the delay operation of the first delay circuit 69.
Sequential selection is not initiated.

FIG. 7 is a circuit diagram showing an example of the display drive circuit 28 and display element 27 shown in FIG. Driving transistors for driving the first to eighth light emitting diodes 77 to 84; 93 is the driving transistor 8;
5, and 94 is a control terminal to which an output switching signal of the switching circuit 32 shown in FIG. 2 is applied. If we are currently receiving a station preset to the first preset channel of the FM band, a signal indicating the reception status is applied from the control circuit 30 to the switching circuit 32, and the switching circuit 32 lights up the display element. A switching signal "L" is applied to the control terminal 94 such that the state is set. The oscillation circuit 93 is a general type and generates an output signal as shown in the figure, but when a switching signal "L" is applied to the control terminal 94, it stops oscillating and the drive transistor 8
5 is kept at "H", and when a switching signal "H" is applied to the control terminal 94, it oscillates and applies an oscillation output signal that becomes "H" or "L" to the base of the drive transistor 85. be. As mentioned above, when a station preset to the first preset channel of the FM band is being received, the signal applied to the first input terminal 95 becomes "H" and the drive transistor 85 is turned on. , 1st
The light emitting diode 77 is turned on and the other light emitting diodes are turned off. In this state, when the first band selection button 2 for selecting the FM band is pressed, the control circuit 30
A start signal is applied to the selection signal generation circuit 25 from the control circuit 30 to start sequential selection, and a signal indicating the selection state is sequentially applied from the control circuit 30 to the switching circuit 3.
2. Therefore, a switching signal "H" is generated from the switching circuit 32, which is applied to the control terminal 94, and the oscillation circuit 93 starts oscillating. Therefore, the oscillation output repeats "H" and "L", and the drive transistor 85 is turned on when the oscillation output is "H" and turned off when it is "L", so when the drive transistor 85 is on, The first light emitting diode 77 lights up and goes out when it is off. Therefore, the first light emitting diode 77 blinks to sequentially display the selected state. By sequential selection, the signal applied to the first input terminal 95 becomes "L", and the second
When the signal applied to the input terminal 96 becomes "H", the second light emitting diode 78 blinks, and the blinking light emitting diodes change sequentially according to the selection.

Although the preset receiver according to the present invention has been described using a hardware circuit, its operation can also be performed by software using a microcomputer.

(f) Effects of the invention As described above, the preset receiver according to the invention has a display element that displays the reception channel in the reception state and a display element that displays the reception channel in the tuning state. Since it can be in a blinking state, it has the advantage of providing an easy-to-read display to the operator. Also,
According to the present invention, a desired station can be easily received by simply operating the band selection button and the preset button, so it has the advantage of good operability.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the external appearance of a preset receiver according to the present invention, Fig. 2 is a circuit block diagram showing its internal circuit, Fig. 3 is a circuit block diagram showing an example of its PLL circuit, and Fig. 4 is a circuit block diagram showing an example of its PLL circuit. FIG. 5 is a circuit block diagram showing an example of the selection signal generation circuit in FIG. 2, FIG. 5 is a circuit block diagram showing an example of the control circuit in FIG. 2, and FIG. 6 is a characteristic diagram for explaining its operation. ,
and FIG. 7 is a circuit diagram showing an example of the display drive circuit and display element of FIG. 2. Explanation of main figure numbers, 2, 3...Band selection button, 4
11... Preset button, 25... Selection signal generation circuit, 27... Display element, 28... Display drive circuit.

Claims (1)

[Scope of utility model registration request] In a preset receiver that is equipped with a plurality of preset buttons corresponding to preset channels and a plurality of band selection buttons, and can preset a plurality of stations for each band, the selection signal generation means for generating a selection signal for sequentially selecting preset stations of the band by pressing a corresponding band selection button; and a preset channel corresponding to the selection signal generated from the selection signal generation means. a display element for blinking the display element; a stop means for stopping the selection operation of the selection signal generating means in response to the press of a preset button corresponding to the display element in the blinking state; A preset receiver comprising a control means for lighting a display element corresponding to a pressed preset button.