JPS58221500A - Emergency car alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency vehicle warning device that detects the approach of an emergency vehicle such as an emergency vehicle and alerts the driver while driving a vehicle.

Recent cars have improved sound insulation measures and car-made days.

Due to the introduction of electronic systems, it has become difficult for sound from outside the vehicle to be transmitted to the driver, creating a problem in which the driver is less likely to feel nervous when an emergency vehicle approaches.

SUMMARY OF THE INVENTION An object of the present invention is to provide an emergency vehicle warning device that allows a driver to reliably recognize the approach of an emergency vehicle even when the windows of the vehicle are closed and a radio or the like is playing inside the interior of the vehicle. It is in.

Next, the present invention will be explained based on one embodiment with reference to the drawings.

Reference numeral 1 denotes a Freon 1 to a microphone mounted on the front surface of the automobile body △, and 11 indicates a sound wave which is received by the Freon 1 and converted into an electrical signal by the microphone, and which has a characteristic level of ゛C in the frequency range of an emergency car siren. Band-pass (
12 is a rectifier circuit that rectifies the electric signal that has passed through the band-pass filter; 13 is a smoothing circuit that inputs the output of the rectifier circuit 12; The resulting alternating current wave is rectified and smoothed, converted into a direct current voltage with a one-to-one correspondence between the amplitude and the amplitude, and output to the Δ-D converter. 14 is an 8-0 converter that converts the voltage output from the smoothing circuit 13 into a digital quantity; 2 is an 8-0 converter that converts the voltage output from the smoothing circuit 13 into a digital quantity; The first center frequency range is designated and covered by the band pass filter 11, and the rectifier circuit, smoothing circuit 13, Δ-
If the level of human power from the conversion/detection circuit 10, which consists of a converter 14 and converts the input signal in the frequency range that has passed through the band-pass filter into a digital quantity corresponding to its level, is greater than the pre-stored data. A combicoater that determines whether or not the microphone is high and specifies the next (second) center frequency range to the bandpass filter;
The level of the human power signal is set in all specified center frequency ranges (℃).When the IJ is high, it is determined that an emergency vehicle is approaching and activates the output device 3. 4 is attached to the rear end surface of the car body A. A rear microphone, 41 a band pass filter, 42 a rectifier circuit, 43 L; L smoothing circuit, and 44 an 8-way conversion circuit, these devices on the rear side have the same configuration as the device on the front mill side. .

First, we will explain the operation of the J emergency vehicle warning system shown in FIG. 1 together with the flowcharts 1 to 1 in the case where there are three designated center frequency ranges shown in FIG. 2.

We conducted a frequency analysis of the siren sound of an emergency vehicle, and the main center frequencies are shown in Figure 3.
The second and third designated center frequencies are fl, f2 . Onibi [Set as 3. In the level check of the first specified center frequency range, the microcomputer 2 first sets the specified center frequency PO-[1 of the pan 1 to pass filters 11 and 41 (101) L, band pass filter 11.41
Specify 11 for , and check the gain of center frequency [1. Human power from the front mill side A-D converter 14 ()1 to ■[, input 1]2 from the rear side A-D converter 44h) to V
Assuming R(102), is V F > V 1? b (1)
Determination (103) J3J: Determine whether R>Vl or not (104). If both of them are lower than the predetermined level V1, keep repeating the check of the gain of the frequency PI111, and check the gain of VF and VR. If either of them is higher than VIJ (Yo), proceed to check the second specified center frequency f2. In the second specified middle frequency IL% (f; 1) O-f2 should be set as 1 (1!+),
The second center frequency 12 is specified for the node pass filters 11J'3 and 41. Same as above, VF=P1, V
R-[]2 and setting 106), VF>V2 f
Nλ/)Xσ) ¥11 (107) J2 and VR>V
2 or not (108). Check the gains of the second specified center frequency [2, and if they are both lower than the predetermined ttl 1<) and V2, return to the check of the first specified center frequency [1, and if one of them is High 0'' color mixture (1, 3rd specified center frequency [Proceed to check 3. 3rd specified center frequency [for check 3, 1 on microphone 1 computer 2 is 1) Q = f3 and set (1
o9) Specify the third middle 4% frequency 13 for the second pass filters 11 and 41. Next, VF=Pi
, Vl sentence-1]2 should be set 110), VF>V
3 or not (111) and J:BI ■1 missing>V3 or not (112) (1).

In this way, by checking the third specified center frequency 13σ] gain, both of them are predetermined.
If it is lower (L1, first designated center circle, wave number [1]), return to the check, and if either one is higher, turn on the output device (alarm) 3.

In this way, we can use programmable bandpass filters to compare multiple key frequencies.
Accurate recognition of siren sound is possible. Regarding noise, the recognition accuracy is improved by comparing three frequencies, and regarding the location of the emergency vehicle, microphones 1. It can be prevented.

Currently, there are several types of d3 siren sounds, but this can be easily handled by changing the data in the microcombi-1.

As described above, the emergency vehicle warning device of the present invention includes a microphone arranged to receive sound waves from outside the vehicle, and a designated center frequency range of the signal received by the microphone that corresponds to the frequency of one noise of the emergency vehicle. a band-pass filter that passes only the component of the received signal, a conversion circuit that converts the filter-passed component of the received signal into a digital signal according to its level, and a center frequency that is based on programmed data and that is passed through the filter. It consists of a microcomputer that specifies the area and activates the alarm that the output of the conversion circuit exceeds the set value.In order to ensure that the driver is aware of the approach of the warning vehicle, the windows of the vehicle are closed and the temperature inside the interior is reduced. 'The driver can recognize the approach of an emergency vehicle even when the radio is on, and can quickly take measures such as evasive action.

[Brief explanation of the drawing]

Figure 1 is an ivy diagram of Emergency Vehicle Warning 8@B1 of the present invention.
FIG. 2 is a graph showing the frequency distribution of the siren, and FIG. 3 is a graph showing the frequency distribution of the siren. In the diagram 1.4...Microphone 1"phone 11.41...
Bandpass filter 2...Microphone 1'' Computer 3...Output device. Figure 1 Figure 3 Figure 2 r4

Claims (1)

[Claims] 1) A microphone arranged to receive sound waves from outside the vehicle, and of the signals received by the microphone, only the components in the central frequency range specified in correspondence with the frequency of the siren of an emergency vehicle. a band-pass filter that passes through the filter; a conversion circuit that converts the filter-passing component of the received signal into a digital signal corresponding to its level; and a microcomputer that activates an alarm when the output of the conversion circuit is equal to or higher than a setting li1. 2) There are multiple designated center frequency ranges, and the microcomputer designates the second center frequency range when the level of the sound in the first designated center frequency range is equal to or higher than the set value, and "The level is set to 1a or higher" At this time, specify the third center frequency range, specify the next center frequency range,
The emergency vehicle warning device according to claim 1, characterized in that the sound level is set in all specified center frequency ranges (when the sound level is 10 or more, the output is output to activate an alarm. 3) The microphone is located in front of the vehicle. An emergency vehicle warning system according to claim 1 (claim 13 and claim 2), characterized in that the vehicle is placed at the rear.