-
公开(公告)号：EP0074858B1
公开(公告)日：1987-07-08
申请号：EP82304870.7
申请日：1982-09-15
CPC分类号： H03D3/007 , H03D1/00 , H03D1/24 , H03D3/006 , H03D5/00 , H03D7/165 , H03D2200/0025 , H03D2200/0035 , H03D2200/005 , H03D2200/0052
-
公开(公告)号：EP0076095B1
公开(公告)日：1986-07-30
申请号：EP82305006.7
申请日：1982-09-23
CPC分类号： H04L27/1525 , H03D3/007 , H03D7/165
-
公开(公告)号：EP0074858A3
公开(公告)日：1984-09-19
申请号：EP82304870
申请日：1982-09-15
CPC分类号： H03D3/007 , H03D1/00 , H03D1/24 , H03D3/006 , H03D5/00 , H03D7/165 , H03D2200/0025 , H03D2200/0035 , H03D2200/005 , H03D2200/0052
摘要： A multi-mode radio receiver divides the radio frequency input into two channels and in each channel mixes it with the carrier wave frequency. A quadrature shift in the mixing carrier wave frequencies enables base band signals to be filtered from the mixer outputs. The analogue quadrature signals are converted to digital form and processed digitally to reproduce the original modulating signal for am, fm or pm transmissions. For ssb modulation the mixing frequency is the side band centre frequency instead of carrier frequency.
-
公开(公告)号：EP0076095A1
公开(公告)日：1983-04-06
申请号：EP82305006.7
申请日：1982-09-23
CPC分类号： H04L27/1525 , H03D3/007 , H03D7/165
摘要： A radio receiver for FM signals having a demodulation system (9) to produce an approximation to an analogue output by either measuring the time intervals between successive zero crossings in the intermediate frequency (I.F.) or by filtering pulses produced at zero crossings of the I.F.
-
公开(公告)号：EP0074858A2
公开(公告)日：1983-03-23
申请号：EP82304870.7
申请日：1982-09-15
CPC分类号： H03D3/007 , H03D1/00 , H03D1/24 , H03D3/006 , H03D5/00 , H03D7/165 , H03D2200/0025 , H03D2200/0035 , H03D2200/005 , H03D2200/0052
摘要： A multi-mode radio receiver divides the radio frequency input into two channels and in each channel mixes it with the carrier wave frequency. A quadrature shift in the mixing carrier wave frequencies enables base band signals to be filtered from the mixer outputs. The analogue quadrature signals are converted to digital form and processed digitally to reproduce the original modulating signal for am, fm or pm transmissions. For ssb modulation the mixing frequency is the side band centre frequency instead of carrier frequency.
-
-
-
-
搜索结果
5 条记录 (耗时 0.008 秒)
