| 摘要 |
A hands-free call answering system without voice recognition includes a radio receiver 10 for receiving an incoming call, an alert generator 60 for generating an alert tone, a microphone 20 responsive for receiving the call recipient's voice input and an audio detector 25 for detecting whether there is a change in audio signal strength, wherein if a change is detected the call is answered and two way communication is enabled. The audio detector includes a bandpass filter and a comparison circuit for detecting whether the call has been answered. <IMAGE> |
