ALARM DEVICE
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 fir...
Gespeichert in:
| Hauptverfasser: | , , |
|---|---|
| Format: | Patent |
| Sprache: | eng ; rus |
| Schlagworte: | |
| Online-Zugang: | Volltext bestellen |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Zusammenfassung: | 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 |
|---|