JPH0683089B2 - Emergency alert receiver - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency alert receiver corresponding to an emergency alert broadcast by television or radio broadcasting.

2. Description of the Related Art Although an emergency alert broadcast for transmitting emergency information such as an earthquake and a tsunami has started, an example of operation of a conventional emergency alert receiver at the time of receiving a test signal or end signal will be described with reference to the drawings. To do.

As shown in FIG. 5 (a), the emergency alert broadcasting is performed by interrupting the conventional broadcast audio signal 11 when the emergency alert information is to be broadcast when the conventional radio and television broadcast audio signal 11 is being performed. To broadcast a start signal 12, then broadcast emergency warning information 13, and at the end broadcast an end signal 14. After that, the audio signal 11 of the conventional broadcast is returned to be broadcast. The period B in FIG. 5 (a) is called emergency alert broadcasting. The start and end signals at this time are mark signals (digital "1" signals)
64 1024 Hz space signal (digital “0” signal)
It is composed of an FSK (frequency shift keying) signal composed of 0 Hz, and the start signal and the end signal are different signals.

The operation of the receiver corresponding to this will be described with reference to FIG. FIG. 6 shows a block diagram of the emergency alert receiver. In FIG. 6, 1 is an antenna, 2 is a tuner section, 3 is a low frequency circuit, 4 is a speaker, 5 is a detection circuit, 6 is a timer circuit, and 7 is a display.

When the emergency warning broadcast is started while the tuner unit 2 is constantly receiving the broadcast, the start signal is output to the tuner unit 2.
12 is taken out and added to the detection circuit 5. When the detection circuit 5 detects that it is a start signal, the output of the detection circuit 5 activates the low-frequency circuit 3 that has not been operated until now, and the sound output from the tuner unit 2 is amplified by the low-frequency circuit 3. The emergency warning information 13 can be heard from the speaker 4. When the end signal comes next, the detection circuit 5 detects that it is the end signal and puts the low-frequency circuit 3 into the cut-off state by the output of the detection circuit 5, and returns to the original standby state. That is, the emergency alert receiver can hear the sound only during the period from the start signal to the end signal of the emergency alert broadcast, even if the sound is not always emitted.

However, since this emergency alert broadcast is not always broadcast, a test broadcast is regularly performed for the emergency alert receiver to confirm whether the receiver is operating normally. The audio signal of the test broadcast at this time interrupts the audio signal 11 of the conventional broadcast as shown in FIG. 4 (a), broadcasts the signal 16 of "Announcement of test broadcast from now on", and then the test signal. It broadcasts 15 and at the end broadcasts a signal 17 of "announcement indicating that it was a test broadcast now" and an audio signal 11 of the original broadcast.

This period A is called a test broadcast, and the test signal 15 broadcasts the same signal as the end signal.

The display operation of the termination signal and the test signal of the emergency alert receiver configured as described above will be described. First, when the test broadcast is received by the receiver of FIG. 6 and the test signal 15 is detected by the detection circuit 5 as a test signal, the operation of the timer circuit 6 is started and a display for a predetermined time (for example, 10 hours) is displayed. 7 is operating. The indicator 7 operates during C in FIG. 4 (b) and then disappears.

However, considering the case where the test broadcasting is performed twice as shown in FIG. 4 (c), the second test signal 15 is generated during the constant period C in which the display 7 is operated by the first test signal 15. Is added to the detection circuit 5 at the point G, the timer circuit 6 does not accept it because it is operating, and the display is turned off at the point H. Also, when the emergency warning signal of FIG. 5 (a) is input, the display 7 is turned on for the period of C by the end signal 14 as in FIGS. 4 (a) and 4 (b). 4), when the emergency warning signal is input twice, the timer circuit 6 is activated by the signal of the second end signal 14 as in FIGS. 4 (c) and 4 (d).
Does not accept, so the same operation is performed.

Problems to be Solved by the Invention However, in the above configuration, when the test signal or the end signal comes while the display 7 is operating, the timer circuit does not accept the operation, and therefore the display 7 is the first test signal. Or, since it operates only for a predetermined period of time after the end signal comes, it is intended to increase the time and establishment that the listener can confirm the operation of the receiver by two test broadcasts. The purpose to do can not be achieved. For example, at 12:00 PM
Even if the second test broadcast is performed at PM5 and the second test broadcast is performed at PM5, the display 7 of the receiver displays PM10 of the timer set time (here, 10 hours) for the first test broadcast. There is a drawback in that the receiver cannot be checked if the listener is out during this time if the receiver is out.

In view of the above problems, the present invention further determines in advance from the time when the next end signal or test signal is received while operating the display 7 by receiving the end signal or test signal of the emergency alert broadcast. The present invention provides an emergency alert receiver for operating the time indicator 7.

Means for Solving the Problems In order to solve the above problems, the emergency alert receiver of the present invention receives an emergency alert broadcast or this test broadcast and detects a termination signal or a test signal with a detection circuit, and from that time. When the display circuit is controlled by the timer circuit so as to operate for a certain fixed period and the next end signal or start signal is detected by the detection circuit while the display circuit is operating, the display circuit is further It is configured to operate for a certain fixed period.

Operation According to the present invention, the timer circuit is restarted when the second end signal or the test signal is received, and the display is further operated for a certain period from this time.

Embodiment An emergency alert receiver according to an embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 3 shows a block diagram of the emergency alert receiver of this embodiment. In FIG. 3, 1 is an antenna, 2 is a tuner section, 3 is a low frequency amplifier, 4 is a speaker, 5 is a detection circuit, 6 is a timer circuit, and 7 is a display. is there.

However, in FIG. 3, the output of the detection circuit 5 is added to the start input section o and the restart input section p of the timer circuit, which is different from FIG. 6 of the conventional example. When the test signal 15 as shown in FIG. 1 (a) comes, the period indicator 7 of C as shown in FIG. 1 (b).
Is the same as in FIGS. 4 (a) and 4 (b).
However, when the test signal is received twice as shown in FIG. 1 (c), a certain fixed time D (the period of D is The display 7 is operated for the same time as C). This is because when the second signal is input to the restart input section p, the timer circuit 6 is reset and returns to the beginning of a certain predetermined time to perform the timer operation.

That is, the first test signal 15 is detected, the timer circuit 6 is operated by the signal input to the o point, and the timer circuit 6 tries to operate for a predetermined time (C). When the test signal is received, the timer circuit 6 is reset by the signal from the restart input section p because it is added to the o input and the p input from the detection circuit 5, and the timer operates from the beginning. The display 7 can be operated (the same time as C time).

Next, the end signals of FIGS. 2 (a), (b) and (c), (d)
Even when 14 is received, FIG. 1 (a), (b) and (c),
The display 7 operates in the same manner as when the test signal of (d) is received, and the display 7 can be operated for a predetermined time by the second signal of FIGS. 2 (c) and 2 (d).

By restarting the timer circuit 6 at the time of receiving the test signal or the end signal, the second end signal 2 can operate the predetermined time indicator 7 at the time of receiving the test signal.

It should be noted that the detection circuit 5 and the timer circuit 6 shown in FIG. 3 can be operated by one microcomputer 8 within the dotted line. At this time, there is no o-point input section and p-point re-input section, and even the same input section can be operated by software.

Although the low-frequency circuit 3 and the speaker 4 are used in the example of FIG. 3, a buzzer can be used instead of the buzzer to sound the buzzer between the start signal and the end signal of the emergency alert broadcast.

Further, instead of this, it is possible to display by light, and it is possible to control other devices by turning on / off a switch.

As described above, the present invention controls the timer circuit to operate the display unit for a certain time when the test signal or the end signal is detected, and the next end signal or the test signal is displayed while the display unit is operating. When this detection circuit detects it, by operating this display for a certain fixed time from this time, it is clear that it is operating with the second signal, and the first test broadcast Even a listener who could not confirm the operation can confirm the operation by the second test broadcast.

[Brief description of drawings]

1 and 2 are timing charts for explaining the operation of the display of the emergency alert receiver in one embodiment of the present invention,
FIG. 3 is a block diagram of an emergency alert receiver in one embodiment of the present invention, FIGS. 4 and 5 are timing charts for explaining the operation of a conventional emergency alert receiver, and FIG.
The figure is a block diagram of a conventional emergency alert receiver. 1 ... Antenna, 2 ... Tuner part, 3 ... Low frequency circuit, 4 ... Speaker, 5 ... Detection circuit, 6 ... Timer circuit, 7 ... Display device, 11 ... Conventional broadcast audio signal , 12
…… Start signal, 13 …… Emergency alert information, 14 …… End signal,
15 …… Test signal.

Claims (1)

[Claims] 1. A tuner unit for receiving an emergency alert broadcast or a test broadcast for an emergency alert broadcast, a detection circuit for detecting an end signal or a test signal, and a display for a certain period of time depending on the output of the detection circuit for the previous period. Equipped with a timer circuit to control so that when the warning signal or the test broadcast for the emergency warning broadcast is received and the termination signal or the test signal is detected by the previous period detection circuit, the display unit is fixed from this time Controlled by the timer circuit to operate for a period of time, and when the display circuit again detects an end signal or a test signal while the display is operating,
An emergency alert receiver characterized in that the display is operated further for a certain fixed period from this time.