JPS58157227A - Receiver for emergency alarming broadcast - Google Patents

Abstract

PURPOSE:To receive a broadcasting for alarming emergency surely, by setting a channel of a broadcast station receiving the broadcasting for alarming emergency to a station being in good conditions in advance. CONSTITUTION:In normal reception, a main power supply 8 is applied to a power supply line with a power supply switch 12, the tuning is done at a tuning operation section 14 and a reception station is selected. When a power switch 18 is set off, the power line of the main power supply 8 is deenergized. In this case, the power line of a low frequency section 3 is set off, and a backup power supply 9 is applied exclusively to a high frequency section 2, an electronic tuning control section 5, an alarm detection section 6 and an alarm reception station channel memory 13. A control signal is transmitted from the power line control section to the section 5 so as to receive a channel data from the memory 13. Thus, when the power supply is set off, the preset alarm reception station is tuned.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency warning broadcast receiver that reliably receives emergency warning broadcasts such as disaster forecasts.

Conventionally, broadcast receivers have had a function called a last channel memory, which allows them to receive the broadcast station they were receiving when the power is turned off the next time the power is turned on, regardless of whether it is a variable condenser tuning method or an electronic tuning method.

However, when such a broadcast receiver tries to receive emergency warning broadcasts when the power is turned off, the receiving station becomes the receiving station that was being listened to at the time the power was turned off, and there is no guarantee that it will be the station with the strongest electric field strength at this point. do not have. For this reason, there was a drawback in that the radio wave conditions were poor and emergency warning broadcasts could not be received due to the poor signal-to-noise ratio.

Furthermore, not all broadcast stations broadcast emergency warnings.
In such a case, there is a drawback that certain stations cannot receive the signal at all.

In order to eliminate these drawbacks, the present invention enables the channel of the broadcasting station that receives the emergency warning broadcast to be set in advance to a station with good conditions.The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, 1
is an antenna, 2 is a high frequency section, 3 is a low frequency section, 4 is a speaker, 5 is an electronic tuning control section, 6 is an alarm detection section, 7 is a power line control section, 8 is a main power supply, 9 is a backup power supply, 10
．． 11 is a diode, 12 is a power switch, 15 is an alarm receiving station channel memory, and 14 is a tuning operation section.

In normal reception, the power switch 12 connects the main power source 8 to the power line, the antenna 1, the high frequency section 2, the electronic tuning control section 5, and the tuning operation section 14 perform tuning operations, and the audio signal is transmitted to the low frequency section 6. The signal is amplified and transmitted to the speaker 4. 111 when the power switch 12 is turned off
6 line control @1% 7 turns off the power line of the main power supply 8. At this time, the power line of the low frequency section 6 is turned off, and the backup power source 9 is applied only to the high frequency section 2, the electronic tuning control section 1 5, the alarm detection section 6, and the alarm receiving station channel memory 13. Further, a control signal is sent from the power line control section 7 to the electronic tuning control section 5 so as to receive channel data from the alarm reception station channel memory 13.

Therefore, when the power is turned off, it will be tuned to the preset alarm receiving station, and if the user sets a receiving station that has an emergency alert broadcasting service and can obtain strong electric field strength in advance, the user can ensure that the emergency alert broadcast is received. Can receive.

FIG. 2 is a detailed diagram showing an embodiment of the invention.

Normal operation is when the power bushing switch 15 is turned on.
Pass through AND Gate 16, via OR Gate 17, 7
The lip 70 knob 18 is set, and the buffer 19
, a high level signal is applied to the base of the transistor 20 , the transistor 20 becomes conductive, the relay 21 is activated, and the AC power source 22 is applied to the transformer 23 . The secondary output of the transformer 23 is applied to a rectifier 24, and the rectifier 24 supplies DC voltages Vcc+ and Vca2 to operate the receiver. The output of the transformer transformer 23 is applied to the other rectifying element 25, and the output of the transformer 23 is applied to the other rectifying element 25.

Turn coupler 26 on. Therefore, inverter 2
7 becomes high level and is sent to the AND gate 28.

On the other hand, 7 lips 70 knobs 29 pieces, power button switch 1
It is in the set state by the button action in step 5. Therefore, the AND gate 28 becomes high level. This high level signal is sent to the inverter 30, and the output of the inverter 30 is sent to the low level (kT, N) transmission gate 61, making this transmission gate conductive. A high signal is sent to the control terminal of the other transmission gate 32, making it non-conductive. The receiver system of this embodiment uses a PLL electronic tuning system. The setting value from the tuning operation section 36 is normally sent to the channel buffer memory 34, and is passed through the transmission gate 31 in a conductive state to the programmable divider 65.
sent to. The input of the programmable divider 35 is frequency-divided by the local oscillation frequency from the local oscillation section 36 using data from the channel buffer memory 34 and sent to the phase comparator 37 . A reference frequency signal from a reference oscillator 38 is sent to an input terminal of the phase comparator 37, and a phase difference signal is sent to a low-pass filter 59. Low pass filter 59
The output is applied to the varicap diode of the local oscillation section 59 and the varicap diode connected to the array coil section 40 to perform a channel selection operation. That is, tuning control is performed via the channel buffer memory 64, making it possible to select a receiving station.

Next, the case where the power is turned off will be described. In the 0 normal reception state, the AND gate 16 is in the OFF state and the AND gate 41 is in the ON state. When the power switch 15 is turned on in this state, the 7-river front panel 18 is turned on via the Punto gate 41 and the OR gate 51, and the output becomes low level. This signal passes through the buffer 19, turns off the transistor 20, makes the relay 21 non-conductive, and connects the AC power source 22 to the transformer 23.
is no longer applied. The output voltage of the rectifying elements 24 and 25 becomes zero. In this state, Vca2 becomes Ov, and the low frequency amplifier 42 is turned off. A voltage of 5V is applied to Veal by the backup battery 43. The photocoupler 26 also becomes off, the inverter 27 becomes low, the AND gate 28 becomes low, the transmission gate 32 becomes conductive, and the transmission gate 51 becomes non-conductive.

The data set in the alert channel memory 44 passes through the transmission gate 62 and is sent to the programmable divider 35. For this reason, synchronization operation is performed in advance.
635, the radio receiver is set according to the channel frequency of the broadcast station most suitable for receiving the emergency warning broadcast service set. When an emergency warning broadcast is broadcast in such a state, the broadcast radio waves enter the antenna 40,
The signal is amplified by a high frequency amplifier 45, converted to an intermediate frequency by a frequency conversion circuit 46, amplified by an intermediate frequency amplifier 47, and detected by a detection circuit 48 to obtain a signal.

The signal is a code signal sent prior to the emergency warning broadcast, and is detected by the emergency warning detection circuit 49, which outputs a pulse signal. This pulse signal is sent to the set terminal of the 7-lip 70-tube 18 via the OR gate 17, thereby setting the 7-lip 70-tube 18 in the set state. As a result, transistor 2o
is turned on, the relay 21 becomes conductive, the AC power supply 22 is applied to the transformer 25, and power from the AC power supply is supplied as 'Vcal and Vco2 through the rectifier element 24, and the low frequency amplifier is also turned on. On the other hand, the output from the emergency alarm detection circuit 49 is the flip 70 knob 29 IJ.
It is applied to the set terminal and puts the 7-lip flop 29 in the reset state. In this state, the AND gate 28 does not open, and even when the AC power supply 22 is turned on, the photocoupler 26 is turned on and the inverter 27 is at a high level, the AND gate 28 is at a low level and the transmission gate 32 is in a conductive state. Further, since the transmission gate 31 is in a non-conductive state and the alarm channel memory is providing data to the programmable divider 35, it becomes possible to hear the emergency warning broadcast from the speaker 50. When a code signal indicating the end of the first emergency broadcast is sent, a pulse signal is sent from the emergency alarm detection circuit to the flip 70 knob 18 via the OR gate 51, setting the flip 70 knob 17 to the reset state and disabling the relay 21. The transformer is brought into a conductive state, and the AC power supply 22 is no longer applied to the transformer, and the state enters an emergency warning reception standby state. When the power bushing switch 15 is turned on in this state, the pulse number i passes through the AND gate 16 and sets the 7 lip 70 bush 18 via the OR gate 17.

and set the 7 request 7p knob 29 to the set state. Therefore, the transformer 26 is added to the tributary power supply 22, making the photocoupler 26 conductive, and the output of the inverter 27 becomes high level. In addition, since the output of the 7-lip front panel 29 becomes high level, the output of the AND gate 28 becomes high level, and the transmission gate 31 opens, causing the channel buffer memory 34 to supply data to the programmable divider 35, thereby allowing normal reception. become a state.

In this embodiment, the case where the main power source is an AC power source has been described, but there is no problem in realizing the present invention even if the main power source is a DC power source such as a battery.

As explained above, according to the present invention, when the receiver is not normally used, it automatically adjusts the reception frequency to the station from which it is easiest to receive emergency warning broadcasts and enters the standby state to receive emergency warning broadcasts. This has the advantage of ensuring that emergency warning broadcasts are received.

Another advantage is that you can set the receiving station in advance, so if you set the receiving frequency to a station with strong electric field strength at the place you are moving, you will not have problems such as failing to receive emergency warning broadcasts even when you carry it around. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the invention, and FIG. 2 is a detailed circuit diagram showing an embodiment of the invention. 1... Antenna 2... High frequency section 3... Low frequency section 4... Speaker 5... Electronic tuning control section 6... ...Alarm detection unit 7...Power line control unit 8...Main power supply 9...Backup power supply 10...Diode 11... Diode 12... Power switch 13... Alarm receiving station channel memory 14.
... Tuning operation section 15 ... Power push switch 16 ...
・AND gate 17...OR gate 18...Flip-flop 19...Buffer 20...Transistor 21...Relay 22...
・AC power supply 23...Transformer transformer 24...
... Rectifying element 25 ... Rectifying element 26.
...Photocoupler 27...Inverter 28...And gate 29...Flip-flop 30...Inverter 31...Transmission gate 32...
... Transmission gate 33 ... Tuning operation section 34 ... Channel buffer memory 35 ...
...Programmable divider 36...
Local oscillator 37... Phase comparator 58...
...Reference oscillator 39 ...Low pass filter 40 ...Antenna coil section 41 ...AND gate 42 ...Low frequency amplifier 43 ...・Backup battery 44...Alert channel memory 45...
... High frequency amplifier 46 ... Frequency intermittent conversion circuit 47 ... Intermediate frequency amplifier 48 ...
Detection circuit 49...Emergency alarm detection circuit 50...Speaker 51...ORGATE and above Applicant Daini Seigokusha Co., Ltd. Agent Patent attorney Mogami Tsutomu No. 1 Kasumi? [2]

Claims (1)

[Claims] A receiver equipped with a receiving section for receiving emergency broadcasts, which includes a high frequency section, an i-child tuning control section, and an alarm receiving station channel memory provided in the receiving section, and a main power source and backup for supplying power to the receiving section. a power source, and a power line control section connected to the main power source and the receiving section, and when the power supply from the main power source is normally stopped, power from the backup power source is supplied to the receiving section; An emergency warning broadcasting receiver comprising a structure in which channel data from the warning receiving station channel memory is input to an electronic tuning control section.