发明名称 |
FSK DISCRIMINATOR |
摘要 |
The outputs of two filter channels for accepting two keying frequencies are compared to produce the output. Each channel uses finite impulse response transversal filters; preferably with an impulse response of duration comparable with the symbol period of the incoming signal. Each channel has a pair of filters for accepting phase quadrature components (or, alternatively, quadrature synchronous demodulators followed by filters): the filter coefficients differ from sinusoidal by (or, in the alternative case, are formed by) a modification function which is the same for both filters of the pair.
|
申请公布号 |
CA1336445(C) |
申请公布日期 |
1995.07.25 |
申请号 |
CA19880575252 |
申请日期 |
1988.08.19 |
申请人 |
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY |
发明人 |
HUGHES, PATRICK MICHAEL;HALL, MARTIN CHRISTOPHER;LIND, LARRY FREDERICK |
分类号 |
H04L27/14;H04L27/148;H04L27/152;(IPC1-7):H03D3/00 |
主分类号 |
H04L27/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|