EP 0091276 A3 19850306 - SOUND PATTERN DISCRIMINATION SYSTEM
Title (en)
SOUND PATTERN DISCRIMINATION SYSTEM
Publication
Application
Priority
US 36554882 A 19820405
Abstract (en)
[origin: EP0091276A2] Apparatus for the selective monitoring and recognition of sounds of different frequencies including a first detector for recognising signals of a first frequency and producing an output signal indicative thereof, at least one further sound detector for recognising a second sound signal of different frequency and producing an output signal indicative thereof, a time delay circuit responsive to the output signal from the first detector, and producing a time delayed enable signal to enable a further circuit connected to the output of the further detector to pass signals from the further detector through the further circuit in response to the enable signal and the output of the further circuit being coupled to a control circuit to produce a control signal only in response to the receipt of signals of said first and different frequency in a sequential time pattern established by the time delay circuit and said further circuit.
IPC 1-7
IPC 8 full level
G08B 1/08 (2006.01); G08G 1/087 (2006.01); G10L 15/02 (2006.01); G10L 15/08 (2006.01)
CPC (source: EP)
G08B 1/08 (2013.01); G08G 1/087 (2013.01)
Citation (search report)
- [X] US 3992656 A 19761116 - JOY IVAN L
- [A] FR 2392846 A1 19781229 - WANDEL & GOLTERMANN [DE]
- [X] US 3735342 A 19730522 - HELLIKER C, et al
- [A] US 3881169 A 19750429 - MALACH HENRY G
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0091276 A2 19831012; EP 0091276 A3 19850306; AU 1308383 A 19831013; JP S59199 A 19840105
DOCDB simple family (application)
EP 83301802 A 19830330; AU 1308383 A 19830331; JP 5806083 A 19830404