JPS6134700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a specific signal receiving device having a function of detecting a specific information signal sent via broadcast radio waves and automatically controlling audio output accordingly.

An example of this type of receiver is an emergency broadcast receiver. This system constantly listens to the relevant broadcasting station, and when an emergency such as an earthquake or tsunami occurs, when a specific code is sent from the broadcasting station, the receiver detects this and listens to this information preferentially. Even if the receiver switch is turned off (however, the high frequency section is always in operation and only the low frequency section is turned off), it will automatically become operational and the above This allows you to listen to emergency information.

However, even if this type of receiver identifies a specific information code and activates the low frequency section, if the volume volume is accidentally turned down to an extremely low level.
In fact, the emergency information may not be transmitted from the speaker, and the objective may not be achieved.

Furthermore, even if a sound is generated, it is often more effective to set the volume level appropriately depending on the listener's surroundings, for example, the listener's time of day, such as while working, eating, or sleeping.

The present invention appropriately responds to such troubles and demands, and in turn significantly improves the effectiveness of emergency broadcasts.

The present invention will be described below with reference to drawings of embodiments. FIG. 1 shows an embodiment of the present invention. In the figure, radio waves coming from an antenna 1 are demodulated by a signal receiving section 2 comprising an RF amplifier, a frequency converter, an IF amplifier, a wave detector, and the like. The demodulated signal is amplified by the AF amplifier 4 and converted into audio by the speaker 5. Here, if the external switch 3 is in the ON state and there is no emergency broadcast, the switches 9 and 10 are connected to contact A, so the output of the signal receiving section 2 can be adjusted freely using the variable resistor 7. The signal is then transmitted to the AF amplifier 4 via switch 9 and switch 3. The volume can be freely adjusted using the variable resistor 7.

However, when an emergency signal is received, a specific code in the output of the signal receiving section 2 is identified by the decoder 6, and the output of the decoder causes the switch 9 to be activated.
and 10 contacts are connected to B. Then, the output of semi-fixed resistor 8 will be switched to switch 10.
The signal is transmitted to the AF amplifier 4 via the . This semi-fixed resistor 8 is used to set the audio level when receiving emergency broadcasts, and should be placed in a place that cannot be easily touched when operating the receiver on a daily basis. That is, the audio output level when receiving an emergency broadcast is uniquely determined by the semi-fixed resistor 8, regardless of the level of the variable resistor 7.

On the other hand, when the external switch 3 is in the OFF state, the output of the signal receiving section 2 is transmitted to the AF amplifier 4 via the semi-fixed resistor 8 only when an emergency broadcast is received. At this time as well, the audio output level is determined by the semi-fixed resistor 8, so even if the variable resistor 7 is set to the minimum value, the emergency signal will be output from the speaker 5 at a sufficient volume regardless of this. can be heard.

In addition, the semi-fixed resistor 8 is as shown in FIG.
If a timer is used to control the volume as programmed in advance, the volume can be set to match the pattern of the listener's daily life. In FIG. 2, 11 is a timer, and 12 is a switch controlled by the timer 11 to set the volume level in a plurality of stages.

As described above, according to the present invention, information can be heard at a predetermined volume when receiving an emergency broadcast, regardless of the adjustment position of the variable resistor 7 that is operated on a daily basis, and the above-mentioned troubles are completely eliminated. . Also,
By incorporating a timer, the volume level during emergency broadcasts can be set according to the listener's predictable lifestyle pattern, so the above information can be transmitted more accurately and the effectiveness of emergency broadcasts can be increased. It is possible to obtain excellent characteristics that are significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the specific signal receiving apparatus of the present invention, and FIG. 2 is a block diagram of main parts showing another embodiment. 2...Signal receiving section, 6...Decoder section, 7...
Variable resistor, 8... Semi-fixed resistor, 11... Timer, 12... Level setting switch, 9, 10...
...Switch.

Claims (1)

[Claims] 1. A specific signal receiving device configured to control a low frequency output level by detecting a specific information signal, comprising: a decoder for identifying a code included in the specific information signal; A variable regulator for adjusting a frequency output level, a semi-fixed regulator that can be set to an arbitrary output level, and a selection means for selecting either the variable regulator or the semi-fixed regulator, A specific signal receiving device characterized in that the semi-fixed regulator is preferentially selected according to the output signal of the decoder, and the output level is set to a preset value. 2. The specific signal according to claim 1, characterized in that the low frequency output level can be changed in multiple stages by a semi-fixed regulator, and the change in the low frequency output level is controlled by a timer means. Receiving device.