JP4162826B2 - Electronic siren for ambulance - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic siren used in an ambulance.
[0002]
[Prior art]
Emergency vehicles such as ambulances and fire trucks are equipped with sirens to inform pedestrians of the approach of the vehicle, but ambulances have a relatively high number of dispatches and are used to convey victims. A soft tone is more convenient for the siren sound. Therefore, the siren sound for an ambulance is distinguished from the siren sound for a fire engine, and a repetitive sound with two high and low sounds (so-called peep sound) is adopted. This siren sound is generated by oscillating the high frequency (peep sound) frequency (960 Hz) and the low frequency (poh sound) frequency (770 Hz) continuously with an oscillator, and the oscillation signal is amplified by an amplifier. “Peepo” sounds.
[0003]
[Problems to be solved by the invention]
By the way, in conventional ambulance electronic sirens, the frequency and sound pressure of the siren sound are constant, regardless of the surrounding environment where the ambulance is located. There are many inconveniences in the area, and there are concerns about noise problems with local residents.
[0004]
However, as ambulances, because of the safety standards for road transport vehicles, a siren sound that satisfies a volume of 90 to 120 horns is required at a position 20 m ahead of the emergency vehicle. Even if there is, you have to drive with a siren.
[0005]
The present invention has been made in view of such circumstances, and does not bother the nighttime, quiet residential areas, areas around fire stations where ambulances are frequently used, and satisfies the safety standards for road transport vehicles. An object is to provide an electronic siren for ambulance.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a siren sound generating circuit that outputs a siren sound signal by repeating two high and low sounds, an amplifying circuit that amplifies the signal from the siren sound generating circuit, and the amplifying circuit reduced in the loudspeaker to sound the siren sound amplified signal, a frequency reducing circuit for both low frequencies of high and low sound of the siren sound, the output of the siren sound, a range of safety standards for road vehicles an output reduction circuit, a siren switch, and housing mode switch, and a volume change-over switch, when-in operation of the siren switch, the housing mode switch is automatically input operation with frequency reducing circuit is activated The volume switch is automatically selected as the low volume switch position and the output reduction circuit is activated. In this state, the housing mode switch is turned off. With-in operation, with the frequency reducing circuit is stopped, operation is switched operation to the volume change-over switch the strength-mute amount switching position characterized by the output reduction circuit stops-operation.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
FIG. 1 is a block diagram showing an embodiment of the present invention. The ambulance siren according to the present invention includes an operation unit 1 and a siren that generates a siren sound having a standard mode siren sound according to the operation of the operation unit 1, a high sound (pee sound) at a frequency of 960 Hz, and a low sound (po sound) at a frequency of 770 Hz. A frequency reduction circuit 2 that lowers the frequency of the siren sound according to the operation of the sound generation circuit 2 and the operation unit 1 by about 10%, for example, a high sound (pee sound) is 850 Hz and a low sound (po sound) is 680 Hz; An output reduction circuit 4 that reduces the output of the siren sound within the range that satisfies the safety standards of road transport vehicles according to the operation of the operation unit 1, and a microphone / microphone that takes in signals from external devices such as a microphone, cassette deck, and wireless tuner The auxiliary input terminal 5, the amplifying circuit 6 for amplifying signals from the siren sound generating circuit 2 and the microphone / auxiliary input terminal 5, and the amplifying circuit 6 It is composed of a speaker 7 for sounding the width signal as siren sound.
[0009]
As shown in FIG. 2, the front surface of the operation unit 1 is an operation panel and includes a plurality of switches. That is, a siren switch 8 for operating the siren sound generating circuit 1, a stop switch 9 for stopping the siren sound generating circuit 2, a house mode switch 10 for operating / stopping the frequency reducing circuit 3, and an output reducing circuit 4 Is provided with a volume switch 11 for switching the sound volume of the siren sound between strong and weak. The siren switch 8 is interlocked with the house mode switch 10 and the volume changeover switch 11. When the siren switch 8 is turned on, the house mode switch 10 is automatically turned on and the volume changeover switch 11 is moved to the low volume change position. Automatically selected. The operation panel is attached to a microphone / auxiliary switch 12 for warning by an external device such as a microphone and cassette deck, a wireless tuner, a test switch 13 for testing a siren sound, and a vehicle roof. A warning light switch 14 for operating or stopping the warning light is provided. The operation panel further includes microphone input jacks 15 and 16 for connecting a microphone, an auxiliary input jack 17 for connecting an external device such as a cassette deck and a wireless tuner, and a cassette deck connected to the auxiliary input jack 17. An auxiliary volume adjusting volume 18 for adjusting the volume of a wireless tuner or the like, and a microphone volume adjusting volume 19 connected to the microphone input jacks 15 and 16 are provided.
[0010]
Next, the operation of the present invention will be described. First, when the siren switch 8 of the operation unit 1 is turned on when moving from a fire department or the like, the house mode switch 10 is automatically turned on in conjunction with the turning operation of the siren switch 8, and the volume switch 11 is turned on. The low sound volume switching position is automatically selected, whereby the siren sound generating circuit 2, the frequency reducing circuit 3 and the output reducing circuit 4 are simultaneously operated, and the siren sound in the house mode (low sound volume) is generated from the speaker 7. Next, when the house mode switch 10 is turned off, the volume switch 11 is automatically selected to the strong volume switch position in conjunction with the turn-off operation of the house mode switch 10, whereby the frequency reduction circuit 3 and the output reduction circuit 4 are selected. Are simultaneously stopped, and the siren sound in the standard mode (high volume) is emitted from the speaker 7. Thereafter, when the house mode switch 10 is turned on / off, the volume switch 11 is automatically switched to the weak / strong volume switching position in conjunction with the house mode switch 10 turning on / off operation. In addition, the output reduction circuit 4 can be activated / stopped at the same time to switch between the house mode (low volume) siren sound and the standard mode (high volume) siren sound and cause the speaker 7 to ring. On the other hand, when the volume switching switch 11 is switched, the output reduction circuit 4 is activated / stopped to switch between a low-volume siren sound and a high-volume siren sound and make the speaker 7 ring.
[0011]
Next, when the stop switch 9 is turned off while the siren sound of the standard mode (high volume) or the house mode (low volume) is sounded from the speaker 7, the siren sound generating circuit 2 is stopped and the speaker 7 is stopped. The standard mode (high volume) or the house mode (low volume) siren sound stops. Next, when the stop switch 9 is pressed again, the siren sound generation circuit 2 is activated and the siren sound in the mode before the stop is sounded from the speaker 7.
[0012]
According to the present invention, the siren sound generation circuit 2, the frequency reduction circuit 3, and the output reduction circuit 4 can be operated simultaneously by turning on and off the siren switch 8, and the frequency can be reduced by turning on and off the house mode switch 10. Since the circuit 3 and the output reduction circuit 4 can be simultaneously activated and stopped, a siren sound in a residential mode (low volume) can be generated at night, in a quiet residential area, or in an area around a fire station where ambulances are frequently used. This house mode (low volume) siren sound is softly audibly soft while securing the volume by reducing the frequency by about 10% lower than the standard mode (high volume) siren sound. It is what I did. For this reason, sirens will not be disturbed at night, in quiet residential areas, areas around fire stations where ambulances are frequently used, etc., and the sound volume satisfies the conditions of the range that satisfies the safety standards for road transport vehicles Can be heard clearly.
[0013]
Note that the basis for the siren sound in the house mode (low volume) about 10% lower than the standard mode (low volume) siren sound is the test of listening to the siren from the position 20m ahead of the emergency vehicle. This is because, as a result of lowering the frequency of the siren sound by 1%, it was possible to hear the siren sound clearly without being annoying when the frequency of the siren sound in the standard mode was lowered by about 10%.
[0014]
The above is a description of one embodiment of the present invention, and the present invention is not limited to this embodiment. For example, a speech synthesizer can be incorporated.
[0015]
【The invention's effect】
According to the present invention described above, since the siren sound frequency is lowered and the volume is secured, the sound can be heard audibly and softly. Can be heard clearly as long as the safety standards for road transport vehicles are satisfied.
[Brief description of the drawings]
FIG. 1 is a block diagram of an emergency electronic siren of the present invention.
FIG. 2 is a front view of an operation unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Operation part 2 Siren sound generation circuit 3 Frequency reduction circuit 4 Output reduction circuit 5 Microphone / auxiliary input terminal 6 Amplification circuit 7 Speaker 8 Siren switch 9 Stop switch 10 Housing mode switch 11 Volume switch

Claims (1)

A siren sound generating circuit that outputs a siren sound signal by repeating two high and low sounds, an amplifying circuit that amplifies the signal from the siren sound generating circuit, and a speaker that generates a siren sound by the signal amplified by the amplifying circuit When a frequency reducing circuit for both low frequencies of high and low sound of the siren sound, the output of the siren sound, and an output reduction circuit to reduce a range of safety standards for road vehicles, and siren switch housing mode switch And a volume selector switch,
When the siren switch is turned on, the house mode switch is automatically turned on and the frequency reduction circuit is activated, and the volume selection switch is automatically selected to the low volume selection position and the output reduction circuit is activated. ,
When the house mode switch is turned on / off in this state, the frequency reduction circuit is stopped / operated, and the volume switching switch is switched to the strong / weak volume switching position to stop / activate the output reduction circuit. An electronic siren for ambulances.

Images