LIMITING MAXIMUM GAIN IN DUPLEX COMMUNICATIONS DEVICES INCLUDING TELEPHONE SETS
摘要
Duplex communication methods and systems with maximum gain limiting such as in telephone handsets and speaker phones are disclosed. The communications system such as a telephone set (100) may generally include a digital signal processor (DSP) (102) having a receive and transmit path in communication with a receiver and a transmitter, respectively, a volume amplifier (118) for amplifying signals on the receive path, and a maximum gain limiter (122) for determining a total return loss between the receive and transmit paths and for limiting a volume amplification level of the volume amplifier (118) to a maximum depending on the total return loss. The maximum gain limiter (122) determines the total return loss by maintaining a total loop gain for the telephone set at less than 0 dB to prevent unstable operation and howling.
申请公布号
WO2006007516(A3)
申请公布日期
2006.05.04
申请号
WO2005US23190
申请日期
2005.06.28
申请人
PLANTRONICS, INC.;LASHLEY, DAVID, GLENN;DOSS, ROBERT, L., JR.;PILOZZI, JOHN
发明人
LASHLEY, DAVID, GLENN;DOSS, ROBERT, L., JR.;PILOZZI, JOHN