JPS6282726A - Emergency alarm broadcast receiver - Google Patents

Abstract

PURPOSE:To attain sure tuning by providing 3-stage of indicating function where the light is put on at the optimum tuning point, blinked when some detuning exists or a received radio wave is weak, and put off at detuning. CONSTITUTION:A tuning indication signal in response to a level of a broad-cast radio wave inputted to a broadcast reception section 1 is extracted by a tuning indication signal output circuit 2, inputted to an input terminal (a) of a comparator circuit 4 and inputted to an LED driver 6. When the level of the tuning indication signal is between C and B being between C and F with the Y axis conversion, a tuning indication LED 7 is put off. a reference voltage setting circuit 3 is set to a voltage at a point F of the tuning indication signal level. When the input level to the input terminal (a) is higher than the reference voltage of an input terminal (b), the comparator circuit 4 outputs a start signal of a blink signal generating circuit 5 to blink the tuning indication LED 7. When the level reaches the tuning indication signal level G or over, an LED driver 6 always puts on a normal tuning indication LED without being affected by a control signal from the blink signal generating circuit 5 thereby displaying that the receiver is in the optimum tuning state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a system for automatically turning off the power to a power amplifier constituting a receiver by an emergency warning signal transmitted from a broadcasting station even if the power to the power amplifier constituting the receiver is cut off. This invention relates to an emergency warning broadcast receiver for quickly transmitting warnings of earthquakes, tsunamis, etc.

Conventional technology Generally, one of the tuning instruction devices in a radio receiver uses a lamp or a light emitting diode (hereinafter referred to as LED), etc.It is a two-stage system that lights up when the receiver is optimally tuned and turns off when it is out of tune. is giving instructions to tune in.

Problems to be Solved by the Invention However, when there is a slight tuning shift or a weak electric field, it is difficult to judge the condition with a two-step display of whether the light is turned on or off, and the broadcasting station In an emergency warning broadcasting receiver that can perform its functions by reliably receiving radio waves from the emergency warning broadcast receiver, this two-step tuning instruction method cannot ensure reliable tuning.

In view of the above-mentioned problems, the present invention provides an emergency warning broadcasting receiver that can reliably tune the tuning instruction device from the conventional two-stage display to the three-stage display of on, two blinks, and off.

Means for Solving the Problems In order to solve the above problems, the emergency warning broadcasting receiver of the present invention lights up when it is at the optimum tuning point, blinks when there is a slight tuning deviation or the received radio waves are weak, This device is characterized by being equipped with a synchronization indicating device having a three-stage indicating function of turning off the light when out of synchronization.

The present invention has the above-described configuration, which enables three-step tuning instructions.When there is a slight tuning deviation or the input signal level to the receiver becomes low, the tuning instruction lamp or LED blinks, and the receiver This alerts the listener that the radio receiver is not in the best state of tune, so that the listener can always keep the radio receiver in the best state.

Embodiment Hereinafter, an emergency warning broadcast receiver according to an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an emergency warning broadcast receiver equipped with a tuning instruction device according to an embodiment of the present invention.

In Fig. 1, 1 is a broadcast receiving section, 2 is a tuning instruction signal output circuit, 3 is a reference voltage generation circuit, 4 is a comparison circuit, 5 is a blinking signal generation circuit, 6 is an LED driver, 7 is an I, ED
It is. FIG. 2 shows the output signal level of the tuning instruction signal output circuit 2 with respect to the high frequency signal input level input to the broadcast receiving section 1. In FIG.

The operation of the emergency warning broadcast receiver configured as described above will be explained using FIGS. 1 and 2.

First, broadcast radio waves sent from a broadcast station are received by the broadcast receiver 1.
Receive at. Next, a tuning instruction signal corresponding to the level of the broadcast radio wave input to the broadcast receiving section 1 is extracted from the tuning instruction signal output circuit 2, and is input to the input terminal a of the comparison circuit 40 and also to the LED driver 6. As shown in Figure 2, the tuning instruction signal changes depending on the input level of the high-frequency signal, and the first stage tuning indication is that the input level of the high-frequency signal is between C and D, that is, the level of the tuning instruction signal is between C and F. When the time is between C and B, which is the range of , the tuning instruction LED
7 is off, indicating that the receiver is improperly tuned.

As the second stage tuning display, the input level of the high frequency signal is D.
-E, that is, when the level of the tuning instruction signal is between B and A, which is in the range between F and G, the following operation is performed. When the high frequency signal input level reaches point D in FIG. 2, that is, the output level of the tuning instruction signal output circuit 2 reaches one or more points, the comparison circuit 4 operates and outputs a signal for activating the blinking signal generation circuit 6. The input terminal of comparison circuit 4 is a
and b, a signal from the tuning instruction signal output circuit 2 is input to a, and a constant voltage is supplied from the reference voltage setting circuit 3 to b to set the level for starting the blinking signal generation circuit 5. ing. This reference voltage setting circuit 3 is set to a voltage at point F of the tuning instruction signal level shown in FIG.

When the input level to input terminal a becomes higher than the reference voltage at input terminal A, comparator circuit 4 outputs an activation signal for blinking signal generation circuit 6 as described above. The activated blinking signal generation circuit 6 controls the LED driver 6 and outputs the tuning instruction LE.
Flash D7. As a result of the above operation, the output level of the tuning instruction signal in Fig. 2 between F and G (between B and A) causes the tuning instruction LED to blink, warning that the input level to the receiver is insufficient. and the use of an external antenna for the listener.

Or inform you of the need to tune to another broadcasting station with better radio wave conditions.

As the third stage tuning display, the input level of the high frequency signal in Figure 2 is equal to or higher than point E, that is, the tuning instruction signal level is 0.
When the value exceeds this point, the LED driver -〇 is not affected by the control signal from the flashing signal generation circuit 6 and lights up the tuning instruction LED at all times to indicate that the receiver is in the optimal tuning state. can.

As described above, the emergency warning broadcast receiver of this embodiment includes a broadcast receiving section, a tuning instruction signal output circuit, a reference voltage generation circuit, a comparison circuit 2, a flashing signal generation circuit, an LED driver, and a tuning instruction L.
A comparator circuit compares the output level of the tuning instruction signal output circuit that follows the high frequency signal level tuned by the broadcast receiving section and the voltage level set by the reference voltage setting circuit, and sets the reference voltage. If the voltage level is higher than the voltage level set in the circuit, the comparator circuit outputs a signal that operates the blinking signal generation circuit, and when out of synchronization, the light is turned off, and the tuning instruction signal level is higher than the reference voltage setting level, and the LED is turned off.
It controls the blinking signal generation circuit until the driver is fully activated and the LED is lit continuously, making it possible to make the LED blink, realizing a 3-step synchronization instruction function: off, blinking, and continuous on. I can do it.

Effects of the Invention As described above, the emergency warning broadcasting receiver of the present invention has three levels of tuning: it lights up when it is at the optimal tuning point, blinks when there is a slight tuning shift or the received radio waves are weak, and turns off when it is out of synchronization. It is possible to realize a receiver that has an instruction function and can always reliably receive emergency warning broadcasts.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an emergency warning broadcasting receiver according to an embodiment of the present invention, and FIG. 2 shows the tuning instruction signal level relative to the high frequency input level to the receiver, showing the switching points of the three-stage tuning display of the present invention. It is a characteristic diagram. DESCRIPTION OF SYMBOLS 1...Broadcast receiving section, 2...Tuning instruction signal output circuit, 3...Reference voltage setting circuit, 4...
... Comparison circuit, 5... Flashing signal generation circuit,
6...L, ED driver, 7...LED for synchronization instruction Agent's name: Patent attorney Toshi Nakao, and 1 other person, Isamu 1
Figure 2 → Selling voice 5 Speech te λpb<'ru

Claims (1)

[Claims] It lights up when it is at the optimal tuning point, blinks when there is a slight tuning shift or the received radio wave is weak, and turns off when it is out of synchronization3.
An emergency warning broadcast receiver characterized by being equipped with a tuning instruction device having a step instruction function.