×

Hands-free telephone set

  • US 5,384,843 A
  • Filed: 09/15/1993
  • Issued: 01/24/1995
  • Est. Priority Date: 09/18/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A hands-free telephone set including a bidirectional microphone (10), a transmitting signal analog digital converter (21), an acoustic echo canceler (60), a transmitting signal digital analog converter (31), a received signal analog digital converter (22), a received signal amplifier (81), a received signal digital analog converter (32) and a loudspeaker (40), said hands-free telephone set comprising:

  • transmitting signal level automatic control means (100) for controlling a level of a transmitting digital signal produced from the transmitting signal analog digital converter (21) and passed through the acoustic echo canceler (60) so that the acoustic echo canceler (60) linearly suppresses acoustic echo produced due to an acoustic coupling between the loudspeaker (40) and the bidirectional microphone (10).

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×