JPH036797A - Alarm tone detector - Google Patents
Alarm tone detectorInfo
- Publication number
- JPH036797A JPH036797A JP1142754A JP14275489A JPH036797A JP H036797 A JPH036797 A JP H036797A JP 1142754 A JP1142754 A JP 1142754A JP 14275489 A JP14275489 A JP 14275489A JP H036797 A JPH036797 A JP H036797A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- frequency component
- alarm
- detected
- alarm sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 45
- 238000012544 monitoring process Methods 0.000 abstract description 13
- 238000007493 shaping process Methods 0.000 abstract description 5
- 230000004044 response Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- 230000005236 sound signal Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 244000145845 chattering Species 0.000 description 3
- 238000003708 edge detection Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 241000269400 Sirenidae Species 0.000 description 1
- 108010063123 alfare Proteins 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Alarm Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は警報音検出装置に係り、特に車外のパトカーや
救急車から発生するサイレン等の警報音を検出してドラ
イバに通知する装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an alarm sound detection device, and particularly to a device that detects an alarm sound such as a siren generated from a police car or an ambulance outside a vehicle and notifies the driver.
く従来技術〉
窓を閉めきって大音量でカーオーディオ再生しながら走
行している時には、オーディオ音声により車外の音はマ
スクされてしまう。Prior Art When driving with the windows closed and the car audio playing at high volume, the sounds outside the car are masked by the audio.
このため、かかる状態においてドライバはパトカーや救
急車等から発生するサイレン等の警報音に気付けず、−
時停止等の対応措置が遅れ当該緊急車両に迷惑を掛ける
。Therefore, in such a situation, the driver does not notice the warning sounds such as sirens generated by police cars, ambulances, etc.
Response measures such as stopping the vehicle are delayed, causing trouble for the emergency vehicle concerned.
そこで、本願出願人は特願平１−９４９２０号「警報音
検出機能付カーオーディオ装置Ｊとして、大音量でカー
オーディオ再生していても、ドライバに警報音発生を認
識させることができるカーオーディオ装置を提案してい
る。この提案しているカーオーディオ装置によれば、自
動車の車外音声をマイクで検出し、該検出された音声に
含まれる所定帯域成分をフィルタにより抽出し、フィル
タから出力される音声信号と予めメモリに記憶されてい
る警報音の特徴を比較して車外の警報音を識別しく音声
認ＩＩ） 、警報音の識別によりカーオーディオ装置の
音量を零にし又は減衰させる。Therefore, the applicant of the present application has published Japanese Patent Application No. 1-94920 titled ``Car audio device J with alarm sound detection function,'' which is a car audio device that can make the driver recognize the occurrence of an alarm sound even when the car audio is played at a high volume. According to this proposed car audio device, audio outside the car is detected by a microphone, a predetermined band component included in the detected audio is extracted by a filter, and the audio is output from the filter. A warning sound outside the vehicle is identified by comparing the characteristics of the sound signal and the warning sound stored in a memory in advance.Voice recognition II) The sound volume of the car audio device is made zero or attenuated based on the identification of the warning sound.
〈発明が解決しようとする課題〉
しかし、かかる音声認識による方法では、高精度に警報
音を認識するには多数のバンドパスフィルタが必要であ
り、しかも数秒間連続して音の検出、特徴記憶、登録音
声との比較を行わなければならず、大量のメモリが必要
となり、高価となる問題がある。尚、フィルタ数やメモ
リを減少させると、誤認識をしたり、連続音の認識がで
きない場合が生じ、しかもダイナミックレンジが小さい
。<Problems to be Solved by the Invention> However, such voice recognition methods require a large number of band-pass filters to recognize alarm sounds with high accuracy, and furthermore, the sound detection and feature memory must be performed continuously for several seconds. , a comparison with the registered voice must be performed, which requires a large amount of memory and is expensive. Note that if the number of filters or memory is reduced, erroneous recognition may occur or continuous sound may not be recognized, and furthermore, the dynamic range will be small.
ロードノイズとのＳ／Ｎ比が取れない等の問題が生じる
。Problems arise, such as not being able to maintain a good S/N ratio with road noise.
以上から、本発明の目的は多数のバンドパスフィルタや
大量のメモリを用いなくても、誤Ｌａせず、しかも連続
音の判断ができ、更にはダイナミックレンジ及びＳ／Ｎ
比を大きくできる警報音検出装置を提供することである
。From the above, it is an object of the present invention to be able to judge continuous sounds without using a large number of band-pass filters or a large amount of memory, and to improve the dynamic range and S/N ratio.
An object of the present invention is to provide an alarm sound detection device that can increase the ratio.
く課題を解決するための手段〉
上記課題は本発明によれば、自動車の車外音声を検出す
るマイクと、該音声に含まれる所定周波数成分を検出す
る検出回路と、該所定周波数成分の継続時間または周期
が予め設定されている範囲内にあるかを監視する監視回
路と、警報音検出信号出力部により達成される。Means for Solving the Problems According to the present invention, the above problems are solved by providing a microphone for detecting sound outside the vehicle, a detection circuit for detecting a predetermined frequency component included in the sound, and a duration time of the predetermined frequency component. Alternatively, this can be achieved by a monitoring circuit that monitors whether the period is within a preset range and an alarm sound detection signal output section.
く作用〉
自動車の車外音声を検出し、該音声に含まれる所定周波
数成分を検出し、該所定周波数成分の継続時間及び又は
周期が、警報音に基づいて予め設定されている範囲内に
あるかを監視し、設定範囲内にあれば警報音検出信号を
出力する。Function> Detects the sound outside the vehicle, detects a predetermined frequency component included in the sound, and determines whether the duration and/or period of the predetermined frequency component is within a preset range based on the alarm sound. is monitored, and if it is within the set range, an alarm sound detection signal is output.
〈実施例〉
第１図は本発明に係わる警報音検出装置をカーオーディ
オ装置に適用した場合のブロック図、第２図は動作説明
用の波形図である。<Embodiment> FIG. 1 is a block diagram when the alarm sound detection device according to the present invention is applied to a car audio device, and FIG. 2 is a waveform diagram for explaining the operation.
第１図において、１０は警報音検出装置、２０はカーオ
ーディオ装置である。警報音検出装置１０において、１
１は車外の音声を検出するためのマイクであり、防水、
防風、防振処理されている。In FIG. 1, 10 is an alarm sound detection device, and 20 is a car audio device. In the alarm sound detection device 10, 1
1 is a microphone for detecting sounds from outside the vehicle, and is waterproof.
Windproof and anti-vibration treated.
パトカーや救急車等の緊急車両が自動車の前方にいると
きには、点滅するライトの光を視覚で容易にｖ！ＰＲで
きるから、特に後方からの警報音を検出できるように例
えばバックナンバープレートの背面に取付けられる。When an emergency vehicle such as a police car or an ambulance is in front of your car, you can easily see the flashing lights. Since it can be used for public relations, it can be attached to the back of a back license plate, for example, so that it can detect warning sounds coming from behind.
１２はマイクアンプ、１３はマイク１１により検出され
た音声信号に含まれる所定帯域成分を通過させるバンド
パスフィルタ（Ｂ Ｐ Ｆ）である。12 is a microphone amplifier; 13 is a bandpass filter (BPF) that passes a predetermined band component included in the audio signal detected by the microphone 11;
消防自動車は３００ Ｈｚ〜１０００Ｈｚの音を低周波
から高周波にスィーブさせてサイレン音（つ、ウー、ウ
ー）を６秒周期で発生し、救急車は７７０Ｈｚ （ボー
）、９６０Ｈｚ （ピー）の２つの音を切り換えてサイ
レン音（ビーポ、ビーポ）を１．３秒周期で発生する。Fire engines generate a siren sound (tsu, woo, woo) at 6-second intervals by sweeping sounds from 300 Hz to 1000 Hz from low to high frequencies, while ambulances emit two sounds of 770 Hz (baud) and 960 Hz (beep). is switched to generate a siren sound (beepo, beep) at a cycle of 1.3 seconds.
このため、バンドパスフィルタ１３は３００ Ｈｚ 〜
１０００ Ｈｚの通過帯域を有し、サイレン周波数以外
の音、例えばエンジン音やロード騒音（タイヤ走行音）
等の環境音をカットするようにしている。この環境音の
カットにより１次段のトーンデコーダの検出感度やダイ
ナミックレンジがより大きくなる。Therefore, the bandpass filter 13 has a frequency of 300 Hz to
It has a passband of 1000 Hz and does not include sounds other than the siren frequency, such as engine noise and road noise (tire running noise).
I try to cut out environmental sounds such as By cutting this environmental sound, the detection sensitivity and dynamic range of the primary stage tone decoder are increased.
１４はＰＬＬ検波回路採用の狭帯域周波数成分検出回路
（トーンデコーダ）で、入力信号５ＮＤ（第３図）に含
まれる特定周波数成分に対してのみ応答するようになっ
ている。従って、例えば検出周波数範囲を９６０±１０
Ｈｚに設定しておけば、トーンデコーダ１４は該周波数
範囲内の信号成分の検出時にハイレベルの検出信号ＡＬ
Ｓを出力し、その他の場合にはローレベルの検出信号Ａ
ＬＳを出力する。このトーンデコーダとしては、例えば
新日本無線（株）社製のＩＣ，ｒＮＪＭ２２１１」が使
用できる。14 is a narrowband frequency component detection circuit (tone decoder) employing a PLL detection circuit, which responds only to a specific frequency component included in the input signal 5ND (FIG. 3). Therefore, for example, if the detection frequency range is 960±10
Hz, the tone decoder 14 outputs a high-level detection signal AL when detecting a signal component within the frequency range.
In other cases, a low level detection signal A is output.
Output LS. As this tone decoder, for example, an IC "rNJM2211" manufactured by New Japan Radio Co., Ltd. can be used.
１５は波形整形回路であり、マイク１１により検出され
る音声信号が小さかったり、検出帯域内にパルス性ノイ
ズが入るとトーンデコーダ１４の出力信号ＡＬＳにチャ
タリングが生じるため、これを整形するものである。す
なわち、波形整形回路１５は検出信号ＡＬＳに含まれる
チャタリングを除去するために平滑しく第２図の信号Ａ
ＬＳ’参照）、ついで所定スレッショールドレベルでス
ライスして波形整形し、整形した信号ＡＬＦを出力する
。15 is a waveform shaping circuit, which shapes the output signal ALS of the tone decoder 14 since chattering occurs when the audio signal detected by the microphone 11 is small or pulse noise enters the detection band. . That is, the waveform shaping circuit 15 smoothes the signal A shown in FIG. 2 in order to remove chattering contained in the detection signal ALS.
(see LS'), then slices at a predetermined threshold level, shapes the waveform, and outputs the shaped signal ALF.
１６は入力信号ＡＬＦのパルス幅（オン継続時間）や周
期が予め設定されている範囲内にあるかを監視して警報
音検出信号ＡＬｂ’ を出力する監視回路であり、設定
されるパルス幅や周期の範囲は検出すべき警報音に基づ
いて決定される。尚、監視回路１６としては、周期、パ
ルス幅の一方のみ監視し、入力信号の周期が設定範囲内
にある時に警報音検出信号ＡＬＤ’ を出力したり、あ
るいは入力信号のパルス幅が設定パルス幅範囲内にある
時に警報音検出信号ＡＬＤ’ を出力するように構成す
ることもできる。16 is a monitoring circuit that monitors whether the pulse width (ON duration time) and period of the input signal ALF are within a preset range and outputs the alarm sound detection signal ALb'; The period range is determined based on the alarm sound to be detected. The monitoring circuit 16 monitors only one of the period and pulse width, and outputs the alarm sound detection signal ALD' when the period of the input signal is within the set range, or when the pulse width of the input signal is within the set pulse width. It is also possible to configure the alarm sound detection signal ALD' to be output when it is within the range.
１７は警報音が検出された時に表示により警報音検出を
ドライバに知らせるデイスプレィ装置。Reference numeral 17 denotes a display device that notifies the driver of the detection of the alarm sound through a display when the alarm sound is detected.
１８は音声合成により警報音が検出されたことを示すメ
ツセージを出力する音声合成回路である。18 is a voice synthesis circuit that outputs a message indicating that an alarm sound has been detected by voice synthesis.
カーオーディオ装置！ｔ２０において、２１〜２３はそ
れぞれラジオチューナ、テーププレーヤ、ＣＤプレーヤ
等のオーディオソース、２４は信号切換部、２５は音量
調整用のボリューム、２６はオーディオ音声の出力を阻
止するミュート回路、２７はオーディオ音声と警報音検
出メツセージを合成するミキサ、２８はアンプ、２９は
スピーカであり、２１〜２９によりカーオーディオ装置
の要部が示される。Car audio equipment! At t20, 21 to 23 are audio sources such as a radio tuner, tape player, CD player, etc., 24 is a signal switching unit, 25 is a volume for volume adjustment, 26 is a mute circuit for blocking the output of audio sound, and 27 is an audio source. A mixer for synthesizing audio and an alarm sound detection message, 28 an amplifier, 29 a speaker, and 21 to 29 indicate the main parts of the car audio system.
尚、以上は１種類の警報音を検出する構成であるが、２
以上の警報音を検出するためには、警報音検出装置１０
における１〜−ンデコーダ１４、波形整形回路１５及び
監視回路１６がそれぞれ検出すべき警報音の数だけ必要
となる。Note that the above is a configuration that detects one type of alarm sound, but two types of alarm sounds are detected.
In order to detect the above alarm sounds, the alarm sound detection device 10
The number of decoders 14, waveform shaping circuits 15, and monitoring circuits 16 required is equal to the number of alarm sounds to be detected.
第３図は監視回路１６の一例を示すブロック図であり、
救急車から出力される警報音（周期１゜３秒のピーボ音
）を識別するようになっており、トーンデコーダ１４（
第１図）から９６０±１０Ｈｚの周波数成分検出信号が
波形整形されて入力されている。FIG. 3 is a block diagram showing an example of the monitoring circuit 16,
It is designed to identify the alarm sound (a beeping sound with a period of 1°3 seconds) output from an ambulance, and the tone decoder 14 (
A frequency component detection signal of 960±10 Hz from FIG. 1) is waveform-shaped and input.
さて、第３図において、１６ａは入力信号ＡＬＦの立上
りを検出する立上り検出部、１６ｂ、］６ｃはそれぞれ
タイマーであり、入力信号Ａ Ｌ Ｆの立上りによりハ
イレベルとなり、０．７５秒及び０．５５秒の計時によ
りローレベルとなる信号ＴＡ、ＴＢを出力する。尚、ｏ
、７５秒、０．５５秒はそれぞれピーボ警報音の１／２
周期である０、６５秒よりそれぞれ０．１秒長く及び短
くなっている。Now, in FIG. 3, 16a is a rising edge detection section that detects the rising edge of the input signal ALF, and 16b, ]6c are timers, which are set to high level by the rising edge of the input signal ALF, and are set to a high level for 0.75 seconds and 0.75 seconds. When 55 seconds are counted, signals TA and TB that become low level are output. Furthermore, o
, 75 seconds, and 0.55 seconds are each 1/2 of the Pibo alarm sound.
They are 0.1 seconds longer and shorter than the periods of 0 and 65 seconds, respectively.
１６ｄはタイマー１６ｂ、１６ｃの計時中に入力信号Ａ
ＬＦの立上りが検出されるとその計時を零にリセットす
るリセット回路、１６ｅはタイマー出力ＴＡ、本ＴＢ
（ＴＢの否定値）の論理積を演算するアンド回路、１６
ｆは入力信号ＡＬＦとアンド回路１６ｅの出力ＴＣとの
論理積を演算するアンド回路である。尚、アンド回路１
６ｆは、人力信号ＡＬＦのパルス幅が０．５５秒以上継
続するとハイレベルの信号ＡＬを出力し、この信号ＡＬ
の存在がビー音検出に相当する。16d is the input signal A while the timers 16b and 16c are measuring time.
A reset circuit that resets the timer to zero when the rising edge of LF is detected, 16e is the timer output TA, this TB
AND circuit for calculating the logical product of (the negative value of TB), 16
f is an AND circuit that calculates the AND of the input signal ALF and the output TC of the AND circuit 16e. Furthermore, AND circuit 1
6f outputs a high level signal AL when the pulse width of the human input signal ALF continues for 0.55 seconds or more, and this signal AL
The presence of this corresponds to the detection of a beep sound.
１６ｇは信号ＡＬの立上り検出回路、１６ｈは信号ＡＬ
の立上りによりハイレベルとなり、１゜７秒の計時によ
りローレベルとなる信号ＴＤを出力するタイマー、１６
１はアンド回路である。上記１．７秒はピーボ警報音の
周期１．３秒より０゜４秒大きくしてあり、最初のビー
音検出後（信号ＡＬ発生後）、１．７秒以内に再度ビー
音を検出した時、ビーポ警報音がまさしく検出されたも
のとして、アンド回路１６ｉから警報音検出信号ＡＬＤ
が出力されるようになっている。１６ｊはゲート回路、
１６には警報音検出信号ＡＬＤ発生により、以後６０秒
間ハイレベルの信号ＴＥを出力するタイマーであり、−
旦ゲート回路１６ｊから警報音検出信号ＡＬＤ’ を出
力したら、以後６０秒間経過するまで警報音検出信号Ａ
ＬＤ’ を外部に出力するのを防止するものである。こ
れは緊急車両が通り過ぎるまで、何度も連続してメツセ
ージが出力されるのを防止するためである。尚、１６１
〜１６ｋにより警報音検出信号出力部が構成されている
。16g is a rising edge detection circuit for signal AL, 16h is signal AL
A timer which outputs a signal TD which becomes high level at the rising edge of TD and becomes low level at the timing of 1.7 seconds, 16
1 is an AND circuit. The above 1.7 seconds is 0°4 seconds longer than the 1.3 second period of the Pibo alarm sound, and after the first beep sound was detected (after the signal AL was generated), the beep sound was detected again within 1.7 seconds. At this time, the AND circuit 16i outputs the alarm sound detection signal ALD, assuming that the beepo alarm sound has been detected.
is now output. 16j is a gate circuit,
16 is a timer which outputs a high level signal TE for 60 seconds upon generation of the alarm sound detection signal ALD;
Once the alarm sound detection signal ALD' is output from the gate circuit 16j, the alarm sound detection signal A is output until 60 seconds have elapsed.
This prevents the LD' from being output to the outside. This is to prevent messages from being output repeatedly until the emergency vehicle passes by. In addition, 161
~16k constitutes an alarm sound detection signal output section.
以上により、監視回路１６によれば、０．５５秒以上継
続してビー音周波数（９６０±１０Ｈｚ）が検出され、
しかる後１．７秒以内に再度ピー音が検出された時、救
急車から発生するピーポ音を検出したものとして警報音
検出信号ＡＬＤ’ が外部に出力される。As described above, according to the monitoring circuit 16, the beep frequency (960±10Hz) is detected continuously for 0.55 seconds or more,
When the beeping sound is detected again within 1.7 seconds thereafter, an alarm sound detection signal ALD' is outputted to the outside, indicating that the beeping sound generated from the ambulance has been detected.
以下、第１図の全体的動作を説明する。The overall operation of FIG. 1 will be explained below.
マイク１１により検出された車外音声はマイクアンプ１
２により増幅された後、バンドパスフィルタ１３に入力
され、ここで車外音声に含まれるサイレン周波数の帯域
成分のみが該バンドパスフィルタを通過してトーンデコ
ーダ１４に入力される。The sound outside the vehicle detected by the microphone 11 is sent to the microphone amplifier 1.
After being amplified by 2, it is input to a band pass filter 13, where only the siren frequency band component included in the sound outside the vehicle passes through the band pass filter and is input to a tone decoder 14.
トーンデコーダ１４は、入力信号ＳＮＤから９６０±１
ＯＨｚの周波数成分（ピー音の周波数成分）を検出して
検出信号ＡＬＳを出力し、波形整形回路１５はその検出
信号ＡＬＳに含まれるチャタリングを除去するために平
滑し、ついで所定スレッショールドレベルでスライスし
て波形整形し。The tone decoder 14 receives 960±1 from the input signal SND.
The OHz frequency component (the beep frequency component) is detected and outputted as a detection signal ALS, and the waveform shaping circuit 15 smoothes the detection signal ALS to remove chattering, and then smooths it at a predetermined threshold level. Slice and shape the waveform.
整形した矩形信号ＡＬＦを監視回路１６に入力する。監
視回路１６は、０．５５秒以上継続してピー音周波数（
９６０±１０Ｈｚ）が検出され、しかる後１．７秒以内
に再度０．５５秒以上継続してピー音周波数を検出した
時、警報音検出信号ＡＬＤ’ を出力する。The shaped rectangular signal ALF is input to the monitoring circuit 16. The monitoring circuit 16 continuously monitors the beep frequency (
960±10Hz) is detected, and then within 1.7 seconds, when the beep frequency is detected again for 0.55 seconds or more, an alarm sound detection signal ALD' is output.
警報音検出信号ＡＬＤ’ が発生すると、ミュート回路
２６は所定時間オーディオ信号を阻止して、その出力を
零とし、同時に音声合成回路１８は予め設定されている
警報音検出メツセージ（警報音の発生源を含む）を出力
する。これにより、ミキサ２７は音声合成回路１８から
の警報音検出メツセージをアンプ２８を介してスピーカ
２９より出力する。又、以上と並行してデイスプレィ装
置１７は警報音が検出されたことや警報音の発生源の種
類（パトカー、救急車等）を表示する。When the alarm sound detection signal ALD' is generated, the mute circuit 26 blocks the audio signal for a predetermined period of time and makes its output zero, and at the same time the voice synthesis circuit 18 outputs a preset alarm sound detection message (the source of the alarm sound). ) is output. As a result, the mixer 27 outputs the alarm sound detection message from the voice synthesis circuit 18 from the speaker 29 via the amplifier 28. Further, in parallel with the above, the display device 17 displays the fact that an alarm sound has been detected and the type of source of the alarm sound (police car, ambulance, etc.).
以上では警報音検出時に、オーディオ音声を零にする場
合について説明したが出力レベルを車外の警報音を聞き
取れる程度に減衰させるように構成してもよい。Although the case where the audio sound is reduced to zero upon detecting the alarm sound has been described above, the output level may be attenuated to such an extent that the alarm sound outside the vehicle can be heard.
又、以上ではオーディオ音声を制御すると共に、警報音
検出を音声合成により音声で、あるいは表示手段により
視覚的にドライバに通知する場合について説明したが、
音声や表示による通知を行わずにオーディオ音声のみを
減衰させるように構成してもよい。Furthermore, in the above description, the case is explained in which the audio sound is controlled and the driver is notified of the detection of the warning sound audibly by voice synthesis or visually by display means.
It may be configured such that only the audio sound is attenuated without providing notification by sound or display.
〈発明の効果〉
以上本発明によれば、自動車の車外音声を検出し、該音
声に含まれる所定周波数成分を検出し、該所定周波数成
分の継続時間及び又は周期が、Ｗ報音に基づいて予め設
定されている範囲内にあるかを監視し、設定範囲内にあ
れば警報音検出信号を出力するように構成したから、窓
を締め切って大音量でカーオーディオ再生していても確
実に警報音を検出でき、すばやい対応ができ緊急車両に
対して迷惑を掛けることがなくなる。<Effects of the Invention> According to the present invention, the sound outside the vehicle is detected, the predetermined frequency component included in the sound is detected, and the duration and/or period of the predetermined frequency component is determined based on the W alarm sound. It is configured to monitor whether it is within a preset range, and output an alarm sound detection signal if it is within the set range, so even if the windows are closed and the car audio is playing at high volume, the alarm will be reliably alerted. It can detect sounds and respond quickly, eliminating the need to disturb emergency vehicles.
又、本発明によれば、狭帯域の周波数成分の周期性に基
づいて警報音の検出を行うように構成したから、誤認識
がなく、しかも連続音が判断でき、更にはダイナミック
レンジやＳ／Ｎ比を大きくできる。Further, according to the present invention, since the alarm sound is detected based on the periodicity of the frequency component in a narrow band, there is no misrecognition, continuous sound can be determined, and the dynamic range and S/ The N ratio can be increased.
第１図は本発明に係わる警報音検出装置をカーオーディ
オ装置に適用した場合のブロック図。
第２図は動作説明用の各部波形図。
第３図は監視回路のブロック図である。
１０・・警報音検出装置
１１・・マイク
１３・・バンドパスフィルタ
１４・・トーンデコーダ
１６・・監視回路
１８・・音声合成回路
２０・・カーオーディオ装置
２６・・ミュート回路FIG. 1 is a block diagram when the alarm sound detection device according to the present invention is applied to a car audio device. FIG. 2 is a waveform diagram of each part for explaining the operation. FIG. 3 is a block diagram of the monitoring circuit. 10... Alarm sound detection device 11... Microphone 13... Band pass filter 14... Tone decoder 16... Monitoring circuit 18... Voice synthesis circuit 20... Car audio device 26... Mute circuit
Claims (1)
る所定周波数成分を検出する検出回路と、該所定周波数
成分の継続時間及び又は周期が予め設定されている範囲
内にあるかを監視する監視回路と、設定されている範囲
内にあるとき、警報音検出信号を出力する信号出力部を
有することを特徴とする警報音検出装置。A microphone that detects sound outside the vehicle, a detection circuit that detects a predetermined frequency component included in the sound, and a monitor that monitors whether the duration and/or period of the predetermined frequency component is within a preset range. An alarm sound detection device comprising: a circuit; and a signal output section that outputs an alarm sound detection signal when the alarm sound is within a set range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1142754A JPH036797A (en) | 1989-06-05 | 1989-06-05 | Alarm tone detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1142754A JPH036797A (en) | 1989-06-05 | 1989-06-05 | Alarm tone detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH036797A true JPH036797A (en) | 1991-01-14 |
Family
ID=15322801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1142754A Pending JPH036797A (en) | 1989-06-05 | 1989-06-05 | Alarm tone detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH036797A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005304014A (en) * | 2004-03-26 | 2005-10-27 | Mitsubishi Electric Research Laboratories Inc | Method and system of information of propagating audio information |
| JP2013171130A (en) * | 2012-02-20 | 2013-09-02 | Jvc Kenwood Corp | Special signal detection device, noise signal suppression device, special signal detection method, and noise signal suppression method |
| JP2014085673A (en) * | 2012-10-23 | 2014-05-12 | Huwei Device Co Ltd | Method for intelligently controlling volume of electronic equipment, and mounting equipment |
| DE102018216676B3 (en) * | 2018-09-28 | 2019-12-05 | Zf Friedrichshafen Ag | Microphone for a vehicle and system for noise reduction with an evaluation module |
| CN113990059A (en) * | 2021-08-04 | 2022-01-28 | 深圳宇凡微电子有限公司 | Wireless signal decoding method, device, equipment and system based on single chip microcomputer |
| DE112016000751B4 (en) | 2015-02-13 | 2022-02-24 | Harman Becker Automotive Systems Gmbh | ACTIVE EARLY WARNING CONTROL SYSTEM AND METHOD FOR A HELMET |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63155399A (en) * | 1986-12-19 | 1988-06-28 | クラリオン株式会社 | Emergency alarm system |
| JPH0193797A (en) * | 1987-10-05 | 1989-04-12 | Nippon Denso Co Ltd | Sound wave recognition equipment |
-
1989
- 1989-06-05 JP JP1142754A patent/JPH036797A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63155399A (en) * | 1986-12-19 | 1988-06-28 | クラリオン株式会社 | Emergency alarm system |
| JPH0193797A (en) * | 1987-10-05 | 1989-04-12 | Nippon Denso Co Ltd | Sound wave recognition equipment |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005304014A (en) * | 2004-03-26 | 2005-10-27 | Mitsubishi Electric Research Laboratories Inc | Method and system of information of propagating audio information |
| JP2013171130A (en) * | 2012-02-20 | 2013-09-02 | Jvc Kenwood Corp | Special signal detection device, noise signal suppression device, special signal detection method, and noise signal suppression method |
| JP2014085673A (en) * | 2012-10-23 | 2014-05-12 | Huwei Device Co Ltd | Method for intelligently controlling volume of electronic equipment, and mounting equipment |
| US9197177B2 (en) | 2012-10-23 | 2015-11-24 | Huawei Device Co., Ltd. | Method and implementation apparatus for intelligently controlling volume of electronic device |
| DE112016000751B4 (en) | 2015-02-13 | 2022-02-24 | Harman Becker Automotive Systems Gmbh | ACTIVE EARLY WARNING CONTROL SYSTEM AND METHOD FOR A HELMET |
| DE102018216676B3 (en) * | 2018-09-28 | 2019-12-05 | Zf Friedrichshafen Ag | Microphone for a vehicle and system for noise reduction with an evaluation module |
| CN113990059A (en) * | 2021-08-04 | 2022-01-28 | 深圳宇凡微电子有限公司 | Wireless signal decoding method, device, equipment and system based on single chip microcomputer |
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