FR2754372A1 - Autonomous individual domestic alarm for building protection - Google Patents

Abstract

The autonomous individual domestic alarm has a box (1) which has an omni-directional micro-element detecting sound signals in the range 20 Hz to 12 KHz. The output from the micro-element passes to a comparator. The comparator can detect a change in ambient noise level, due to a window opening. The box internal electronics switches from rest state to temporary alert state upon receipt of a signal, and then to alarm state switching the external siren when the change of sound level is confirmed.

Description

 The present invention relates to a domestic home alarm device, based on low frequencies.

 An "omnidirectional micro electret", whose frequency is between 20 Hz and 12 Kz, is installed in a comparison situation.

 After a first acquisition of the ambient noise, the electret microphone makes permanent measurements of the ambient noise, compares the result obtained with its acquisition.

 Any variations detected, (opening doors or windows), alert the microphone, destabilizes the balance between listening and acquisition, transforms this information into an electrical signal, and triggers an alarm bell.

 No installation is necessary, it is available at any place in a house, apartment, shed, trade, etc.

 No animal or person in the perimeter to be protected, can untimely trigger this alarm.

 Easily unclassifiable, it can be portable.

The device according to the invention breaks it down as follows:
- A housing 0
Featuring on the front band:
a) an orifice2 "sensor" of frequencies
b) a key 3 positions, (c)
c) a speaker (E)
d) two leds of different colors Q
On the back band
e) two fuses
f) a sensitivity adjustment button (9
g) a trigger delay0
h) an outdoor siren output
i) a last exit will be made, optional, phone Qo
SPECIAL DESCRIPTION
The present invention relates to a domestic home alarm device, based on low frequencies.

 An "omnidirectional micro electret",> whose frequency is between 20 Hz and 12 Kz. is installed in a comparison situation.

 After a first acquisition of the ambient noise, the electret microphone makes permanent measurements of the ambient noise, compares the result obtained with its onginal acquisition.

Any variations detected (opening of doors or windows),
alert the microphone, destabilizes the balance between listening and acquisition,
transforms this information into an electrical signal, and triggers a
alarm tone, broadcast by an HP piezo.

Two separate signals make up this alarm
1) Modulated signal
20). Continuous signal
I1 appears in the form of a housing forming an alarm block called
"VIGIE", backed by a 9.6 V, 280 mA battery, at Cd Nk.

 No special installation is necessary, except mains connection, 220 V.

After adjusting the sensitivity, (depending on the surface to be protected),
it is available at any place in the middle of a house, an apartment, a shed, a shop, etc.

 Its maximum protection is: 300 m2, on 3 levels.

No animal or person in the surface to be protected,
can not inadvertently trigger this alarm.

 Easily unclassifiable, it can be portable.

SPECIAL DESCRIPTION
The housing, alarm block "VIGIE" according to the invention, breaks down as follows:
- A housing
comprising; On the strip having: a) an orifice (2) "sensor" of frequencies
b) a key 3 positions 3
The three positions are:
off: "off" position
Please: position "modulated signal" of a few seconds triggered during an intrusion, broadcast by a piezo HP built into the alarm unit, independent of the general alarm, does not switch the output, "siren ext"
Alarm: "continuous signal" position of 2.30 to 3 minutes triggered during an intrusion, difflisé by a piezoelectric HP built into the alarm unit, switching the output "siren ext"", causing the commissioning of any equipment connected to this jack, outdoor siren, camera, VCR, etc.
c) a loudspeaker 4, piezo type
d) two lieds of different colors (i), alarm, please
On the back band
e) two fuses 6, 220 V> 12 V (independent of the battery)
f) a "sensitivity" adjustment button 7, maximum range, 300 m2, on 3 levels
g) a "delay" button entered, (0 to 20 sec)
h) an "outside" siren output 9, activated by the position
of key: "Alarm"
i) one last output is optional, "transmitter" tel 10

Claims (1)

The present invention relates to an individual home alarm block, portable or fixed, without special installation, based on noise, low frequencies. An "omnidirectional micro electret, whose frequency is between  20 Hz and 12 Kz, is wired in comparator.  After a first acquisition of the ambient noise, the electret microphone  performs permanent measurements of ambient noise, compares the result  obtained with its original acquisition.  Any frequency variations due to the opening of doors or windows  alert the microphone, destabilize the comparison, transform this information  in an electrical signal, and triggers the alarm sound, broadcast by a  H.P. piezo alarm block.  Two separate signals make up this alarm  10) Modulated signal, position of the key "Please" immediate signal  of a few seconds, ignoring the "entry delay"  broadcast by the H.P alarm block, without switching the career output "siren ext".  2) Continuous signal, key position "Alarm" continuous signal of  2.30 to 3 minutes, taking into account the "entry delay", diffracted  by the H.P alarm block, plus switching the rear output  sirenc ext ".  It appears in the form of an enclosure forming an alarm block  called "VIGIE" saved by a battery of: 9.6 V, 280 m.A, Cad Nik.  After adjusting the sensitivity, (depending on the surface to be protected),  it is available at any place in the middle of a house, a  apartment, shed, trade, etc.  His maximum protection is. 300 m2, on 3 levels.  No animal or person in the surface to be protected,  can not inadvertently trigger this alarm.  Easily unclassifiable, it can be portable.