专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

DK38682A 未知
公开(公告)号：DK38682A
公开(公告)日：1982-07-30
申请号：DK38682
申请日：1982-01-28
申请人： RCA CORP
发明人： DIETERICH C B , CHRISTOPHER T J , MEHROTRA G N
IPC分类号： H03G7/00 , H04B
摘要： In a signal expander, the envelope of an input signal (S1) to be expanded is detected (30) and applied as a control signal (S3) to the gain control input (18) of a variable gain device (14) which expands the input signal. The control signal is applied to the variable gain device via an adaptive filter (40) having improved ripple reduction and transient performance characteristics to minimize audibility of gain changes. The adaptive filter includes a low pass filter (50,52) for producing a smoothed control signal essentially free of ripple and an analog gate (70,74,78) for coupling the greater of the smoothed signal or a further signal to the variable gain device, the further signal being equal to the detector output signal less a constant. Compression of an input signal is provided by applying the input signal to the non-inverting input (110) fig 3 not shown of an amplifier (100) and feeding the (compressed) output signal (S1) of the amplifier to the expander (30,40, 14) and feeding the output signal (S2) of the expander to the inverting input of the amplifier (100).

2. 发明专利

SE8200367L 未知
公开(公告)号：SE8200367L
公开(公告)日：1982-07-30
申请号：SE8200367
申请日：1982-01-22
申请人： RCA CORP
发明人： DIETERICH C B , CHRISTOPHER T J , MEHROTRA G N
IPC分类号： H03G7/00 , H04B1/64
摘要： In a signal expander, the envelope of an input signal (S1) to be expanded is detected (30) and applied as a control signal (S3) to the gain control input (18) of a variable gain device (14) which expands the input signal. The control signal is applied to the variable gain device via an adaptive filter (40) having improved ripple reduction and transient performance characteristics to minimize audibility of gain changes. The adaptive filter includes a low pass filter (50,52) for producing a smoothed control signal essentially free of ripple and an analog gate (70,74,78) for coupling the greater of the smoothed signal or a further signal to the variable gain device, the further signal being equal to the detector output signal less a constant. Compression of an input signal is provided by applying the input signal to the non-inverting input (110) fig 3 not shown of an amplifier (100) and feeding the (compressed) output signal (S1) of the amplifier to the expander (30,40, 14) and feeding the output signal (S2) of the expander to the inverting input of the amplifier (100).

你已经成功收藏专利！

检索式保存成功!

IPRDB