EP 4089655 A1 20221116 - AN ACOUSTIC INTERFACE FOR AN ALARM DEVICE
Title (en)
AN ACOUSTIC INTERFACE FOR AN ALARM DEVICE
Title (de)
AKUSTISCHE SCHNITTSTELLE FÜR EINE ALARMVORRICHTUNG
Title (fr)
INTERFACE ACOUSTIQUE POUR UN DISPOSITIF D'ALARME
Publication
Application
Priority
EP 21173146 A 20210510
Abstract (en)
An acoustic interface (1) is for a device such as an alarm device. It has a vibratory element piezoelectric horn (2) and a drive circuit (8, 5) with a processor (8) for delivering drive electrical signals (7) to the horn to cause it to vibrate and generate a sound signal with encoded binary data. The piezo horn (2) has a natural frequency, and the control signals are frequency encoded with pulses having pulse widths (t<sub>p</sub>) which are significantly shorter than the vibrating member natural frequency period (1/f<sub>N</sub>). The encoding processor (8) provides the control signals via a feedback transistor (5) and a voltage oscillator (6), the vibratory element (2) having at least three electrical contacts of which two are for power and a third is for feedback to the feedback transistor (5), in which mechanical oscillation of the vibratory element generates an electrical feedback signal used to amplify this control signal (7).
IPC 8 full level
G08B 3/10 (2006.01); G10K 9/122 (2006.01); G10K 9/18 (2006.01); B06B 1/02 (2006.01)
CPC (source: EP)
G08B 3/10 (2013.01); G10K 9/122 (2013.01); G10K 9/18 (2013.01); B06B 1/0215 (2013.01)
Citation (applicant)
EP 2461299 A2 20120606 - E I TECHNOLOGY LTD [IE]
Citation (search report)
- [AD] EP 2461299 A2 20120606 - E I TECHNOLOGY LTD [IE]
- [A] US 2013197320 A1 20130801 - ALBERT DAVID E [US], et al
- [A] EP 3502741 A2 20190626 - AISIN SEIKI [JP]
- [A] US 2016119168 A1 20160428 - ROY NIRUPAM [US], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 22169570 A 20220422