FIELD: ultrasonic intruder and fire alarm, particularly for rooms with high noise level.
SUBSTANCE: device has generator, transmitting and receiving electroacoustic ultrasonic frequency converters, high-frequency amplifier, low-frequency amplifier, mixer, alarm units to warn about intruder and fire, note amplifier, phase changer, attenuator, summing unit and receiving electroacoustic sound transformer.
EFFECT: prevention of false operation in presence of intensive noise in scanned area due to noise compensation.
2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| ALARM DEVICE | 2002 |
|
RU2231121C1 |
| SECURITY ALARM DEVICE | 1998 |
|
RU2130201C1 |
| 0 |
|
SU436373A1 | |
| RADIO WAVE DEVICE FOR ALARM SIGNALLING WITH CONTINUOUS RADIATION OF FREQUENCY-MODULATED OSCILLATIONS | 2014 |
|
RU2584496C1 |
| DEVICE FOR BURGLAR AND FIRE ALARM | 2001 |
|
RU2210813C2 |
| DOUBLE-FREQUENCY PULSED-DOPPLER ALARM DEVICE | 2015 |
|
RU2594383C1 |
| FIRE EARLY DETECTION METHOD AND DEVICE THEREFOR | 2012 |
|
RU2533299C2 |
| GUARD SIGNALLING SYSTEM | 1992 |
|
RU2050596C1 |
| EARLY FIRE DETECTION METHOD AND DEVICE FOR ITS IMPLEMENTATION | 2010 |
|
RU2427922C1 |
| SECURITY ALARM DEVICE | 1996 |
|
RU2124232C1 |
