FR2435169A1 - Acoustic horn for vehicles - has pulse width modulated circuit output to maintain constant power of horn - Google Patents

Acoustic horn for vehicles - has pulse width modulated circuit output to maintain constant power of horn

Info

Publication number
FR2435169A1
FR2435169A1 FR7916790A FR7916790A FR2435169A1 FR 2435169 A1 FR2435169 A1 FR 2435169A1 FR 7916790 A FR7916790 A FR 7916790A FR 7916790 A FR7916790 A FR 7916790A FR 2435169 A1 FR2435169 A1 FR 2435169A1
Authority
FR
France
Prior art keywords
horn
constant power
maintain constant
vehicles
pulse width
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.)
Granted
Application number
FR7916790A
Other languages
French (fr)
Other versions
FR2435169B3 (en
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.)
Schaltbau GmbH
Original Assignee
Schaltbau GmbH
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 Schaltbau GmbH filed Critical Schaltbau GmbH
Publication of FR2435169A1 publication Critical patent/FR2435169A1/en
Application granted granted Critical
Publication of FR2435169B3 publication Critical patent/FR2435169B3/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/023—Driving circuits for generating signals continuous in time and stepped in amplitude, e.g. square wave, 2-level signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply

Abstract

The acoustic horn for automobiles is designed to operate at an approximately constant power level. The horn loudspeaker is driven by square wave signals from an amplifier. An oscillator provides a square wave output that is gated by a control signal from an operational amplifier that processes a sawtooth waveform signal from the oscillator. The operational amplifier output depends upon the input being compared with a voltage drop across the loudspeaker. The overall effect is that the loudspeaker receives pulses with a width inversely proportional to voltage to maintain constant power.
FR7916790A 1978-08-31 1979-06-28 Acoustic horn for vehicles - has pulse width modulated circuit output to maintain constant power of horn Granted FR2435169A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2837951A DE2837951C2 (en) 1978-08-31 1978-08-31 Circuit for an electrical, contactless, acoustic signal transmitter

Publications (2)

Publication Number Publication Date
FR2435169A1 true FR2435169A1 (en) 1980-03-28
FR2435169B3 FR2435169B3 (en) 1982-06-04

Family

ID=6048320

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7916790A Granted FR2435169A1 (en) 1978-08-31 1979-06-28 Acoustic horn for vehicles - has pulse width modulated circuit output to maintain constant power of horn

Country Status (5)

Country Link
DE (1) DE2837951C2 (en)
ES (1) ES482602A1 (en)
FR (1) FR2435169A1 (en)
IT (1) IT1120506B (en)
YU (1) YU199879A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2440658A1 (en) * 1978-10-30 1980-05-30 Rabe Erich CONTROL CIRCUIT FOR AN ELECTRIC OR ELECTROMECHANICAL OSCILLATING SYSTEM, PARTICULARLY FOR ACTUATING A COMPRESSOR OF A REFRIGERANT APPARATUS
GB2404813A (en) * 2003-08-06 2005-02-09 Agilent Technologies Inc Volume control of loudspeaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908970C2 (en) * 1978-08-31 1985-09-05 Schaltbau GmbH, 8000 München Circuit for acoustic signal generator
GB2346758B (en) * 1999-02-10 2003-07-30 Manhar Amlani Audible warning devices

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2440658A1 (en) * 1978-10-30 1980-05-30 Rabe Erich CONTROL CIRCUIT FOR AN ELECTRIC OR ELECTROMECHANICAL OSCILLATING SYSTEM, PARTICULARLY FOR ACTUATING A COMPRESSOR OF A REFRIGERANT APPARATUS
GB2404813A (en) * 2003-08-06 2005-02-09 Agilent Technologies Inc Volume control of loudspeaker
GB2404813B (en) * 2003-08-06 2006-11-29 Agilent Technologies Inc Method and apparatus for volume control
US7424120B2 (en) 2003-08-06 2008-09-09 Avago Technologies General Ip Pte Ltd Method and apparatus for volume control

Also Published As

Publication number Publication date
YU199879A (en) 1983-02-28
DE2837951A1 (en) 1980-03-13
IT7950025A0 (en) 1979-08-10
DE2837951C2 (en) 1983-09-22
FR2435169B3 (en) 1982-06-04
IT1120506B (en) 1986-03-26
ES482602A1 (en) 1980-04-01

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