JPS61287309A - Speaker broadcast system - Google Patents

Speaker broadcast system

Info

Publication number
JPS61287309A
JPS61287309A JP12859985A JP12859985A JPS61287309A JP S61287309 A JPS61287309 A JP S61287309A JP 12859985 A JP12859985 A JP 12859985A JP 12859985 A JP12859985 A JP 12859985A JP S61287309 A JPS61287309 A JP S61287309A
Authority
JP
Japan
Prior art keywords
speaker
sound
noise
output
amplifier
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
Application number
JP12859985A
Other languages
Japanese (ja)
Inventor
Tadashi Fujie
藤江　正
Takatsugu Yamaguchi
山口　隆次
Shunichi Suzuki
俊一 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, NEC Engineering Ltd filed Critical NEC Corp
Priority to JP12859985A priority Critical patent/JPS61287309A/en
Publication of JPS61287309A publication Critical patent/JPS61287309A/en
Pending legal-status Critical Current

Links

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  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To listen to an alarm sound from a speaker supply by poviding a sound collecting means collecting surrounding noise at speaker installed position and using an output of the sound collection means so as to control a sound amplifier output to the speaker. CONSTITUTION:A microphone 3 collects always the surrounding noise of the speaker 2 at all times and outputs a noise value to a sound amplified control circuit 4. The sound amplifier control circuit 4 gives a control signal 5 to a sound amplifier 1 so that the output level of the sound amplifier 1 is over the noise value by 6dB in the sound pressure level based on said noise value when the speaker broadcast is started. Thus, the alarm sound from the speaker 2 connected to the sound amplifier 1 is broadcast at the sound pressure level over 6dB than the sorrounding noise at that time.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はスピーカ放送方式に関し、特にダムから放流す
るときの警報音をスピーカから放送するスピーカ放送方
式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speaker broadcast system, and more particularly to a speaker broadcast system for broadcasting an alarm sound from a speaker when water is released from a dam.

〔従来の技術〕[Conventional technology]

従来、この種のスピーカ放送方式では、音声増幅器とス
ピーカが直接接続され、スピーカの周囲騒音に対する考
慮がなされていなかった。つまシ、スピーカからは周囲
騒音の大きさには関係なくいつも一定レベルの警報音を
発していた。Conventionally, in this type of speaker broadcast system, an audio amplifier and a speaker are directly connected, and no consideration is given to ambient noise around the speaker. The alarm sound was always emitted from the speaker at a certain level, regardless of the level of surrounding noise.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述した従来のスピーカ放送方式では、スピーカ設置個
所の周囲騒音に対する考慮がなされていないので、設計
時に予定した警報音到達範囲内でも周囲騒音が太きいと
きは警報音を聞きとシ難いことがあるという欠点がある
。The conventional speaker broadcasting method described above does not take into account the ambient noise at the location where the speaker is installed, so even if the alarm sound is within the range planned at the time of design, it may be difficult to hear the alarm when the ambient noise is loud. There is a drawback.

〔問題点を解決するだめの手段〕[Failure to solve the problem]

本発明のスピーカ放送方式は、スピーカ設置個所の周囲
騒音を集音する集音手段を備え、該集音手段の出力によ
り前記スピーカへの音声増幅器出力を制御するようにし
ている。The speaker broadcast system of the present invention includes a sound collection means for collecting ambient noise at a location where the speaker is installed, and the output of the sound collection means controls the output of the audio amplifier to the speaker.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明のスピーカ放送方式の一実施例を示すブ
ロック図である。FIG. 1 is a block diagram showing an embodiment of the speaker broadcast system of the present invention.

同図において、本実施例は、音声増幅器１と、その出力
により警報音を１発するスピーカ２と、スピー力２の設
置個所の周囲騒音を集音するマイクロホン３と、マイク
ロホン３の出力に応じて音声増幅器１の出力を可変にす
る音声増幅器制御回路４とから成る。In the figure, the present embodiment includes an audio amplifier 1, a speaker 2 that emits an alarm sound by its output, a microphone 3 that collects ambient noise at the location where the speaker 2 is installed, and a and an audio amplifier control circuit 4 that makes the output of the audio amplifier 1 variable.

続いて本実施例の動作について説明する。Next, the operation of this embodiment will be explained.

マイクロホン３は常時スピーカ２の周囲騒音を集音して
音声増幅器制御回路４に騒音値を出力する。音声増幅器
制御回路４は、スピーカ放送が開始された時の前記騒音
値により、音声増幅器ｌの出力レベルが該騒音値よシ音
圧レベルで５ｄＢ以上上回ったものになるように音声増
幅器１に制御信号５を送る。従って音声増幅器１に接続
されたスピーカ２からの警報音は、その時の周囲騒音よ
シ５ｄ１３以上上回った音圧レベルで放送される。The microphone 3 constantly collects ambient noise from the speaker 2 and outputs the noise value to the audio amplifier control circuit 4. The audio amplifier control circuit 4 controls the audio amplifier 1 so that the output level of the audio amplifier l exceeds the noise value by 5 dB or more in terms of sound pressure level, depending on the noise value when speaker broadcasting is started. Send signal 5. Therefore, the alarm sound from the speaker 2 connected to the audio amplifier 1 is broadcast at a sound pressure level that is 5d13 or more higher than the surrounding noise at that time.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、スピーカ放送時にスピー
カの周囲騒音を集音して音声増幅器出力を可変すること
により、スピーカからの警報音が確実に聞こえるように
なる効果がおる。As described above, the present invention has the effect that the alarm sound from the speaker can be reliably heard by collecting ambient noise from the speaker and varying the output of the audio amplifier during speaker broadcasting.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明のスピーカ放送方式の一実施例を示すブ
ロック図である。 １・・・・・・音声増幅器、２・・・・・・スピーカ、
３・・・・・・マイクロホン、４・・・・・・音声増幅
器制御回路、５・・・・・・制御信号。FIG. 1 is a block diagram showing an embodiment of the speaker broadcast system of the present invention. 1...Audio amplifier, 2...Speaker,
3...Microphone, 4...Audio amplifier control circuit, 5...Control signal.

Claims (1)

【特許請求の範囲】[Claims] 警報音をスピーカから放送するスピーカ放送方式におい
て、前記スピーカ設置個所の周囲騒音を集音する集音手
段を備え、該集音手段の出力により前記スピーカへの音
声増幅器出力を制御することを特徴とするスピーカ放送
方式。A speaker broadcast system for broadcasting an alarm sound from a speaker, comprising a sound collection means for collecting ambient noise at a location where the speaker is installed, and controlling an audio amplifier output to the speaker by the output of the sound collection means. Speaker broadcast method.
JP12859985A 1985-06-13 1985-06-13 Speaker broadcast system Pending JPS61287309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12859985A JPS61287309A (en) 1985-06-13 1985-06-13 Speaker broadcast system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12859985A JPS61287309A (en) 1985-06-13 1985-06-13 Speaker broadcast system

Publications (1)

Publication Number Publication Date
JPS61287309A true JPS61287309A (en) 1986-12-17

Family

ID=14988755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12859985A Pending JPS61287309A (en) 1985-06-13 1985-06-13 Speaker broadcast system

Country Status (1)

Country Link
JP (1) JPS61287309A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2770015A1 (en) * 1997-10-22 1999-04-23 Regine Cousin Parking control system for protection of disabled parking spaces against misuse
KR100705039B1 (en) * 2005-09-12 2007-04-09 엘지전자 주식회사 Voice level over warning function
US20090189786A1 (en) * 2007-03-30 2009-07-30 Airbus France Method and device for modifying the sound volume of an audio alarm signal onboard an aircraft

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2770015A1 (en) * 1997-10-22 1999-04-23 Regine Cousin Parking control system for protection of disabled parking spaces against misuse
KR100705039B1 (en) * 2005-09-12 2007-04-09 엘지전자 주식회사 Voice level over warning function
US20090189786A1 (en) * 2007-03-30 2009-07-30 Airbus France Method and device for modifying the sound volume of an audio alarm signal onboard an aircraft
US8831245B2 (en) * 2007-03-30 2014-09-09 Airbus Operations Sas Method and device for modifying the sound volume of an audio alarm signal onboard an aircraft

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