231191 ⎘
Details of selecting apparatus or arrangements; Electrical details; Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope
#2Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope
#3Method and apparatus for detecting a set up signal used for data communication over a communication network
#4Tone signal circuit and wireless receiver
#5One Way and Round Trip Delays Using Telephony In-Band Tones
#6Method and apparatus for detecting a set up signal used for data communication over a communication network
#7DTMF tone monitoring apparatus and method of identifying a DTMF tone
#8System and method for reducing call latency in monitored calls
#9Dual-rate single band communication system
#10Tone detector and method used in a robot for detecting a tone
#11Telephone communications system increasing a reception count twofold
#12Device and method for preventing wiretapping on power line
#13Selective tone event detector and method therefor