FM-PM receivers with frequency deviation compression

Details FM-PM receivers with frequency deviation compression FM-PM receivers with frequency deviation compression

1996-01-11

1998-09-01

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455260, 331 23, 332128, H04B 126

Patent

active

058024620

ABSTRACT:
Signal processing apparatus (410) includes a phase-locked oscillator (200, 236, 310, 330, 390), having a closed loop with both forward (204) and feedback (206) paths, that is a part of a larger closed loop (438). The larger loop (438) is phase locked to the phase-locked oscillator (200, 236, 310, 330, 390) by a signal derived from the larger closed loop (438) that modulates the feedback path (206), and by an output frequency of the phase-locked oscillator (200, 236, 310, 330, 390) that is delivered to the larger loop (438). Modulating the feedback path (206) either adds pulses to the feedback path (206) or removes pulses, thereby causing irregularities in the flow of pulses. A low-pass filter (210) in the feedback path (206) obviates these irregularities, thereby also obviating incidental frequency modulation (IFM) in the output of the phase-locked oscillator (200, 236, 310, 330, 390). Frequency response limitation caused by the low-pass filter (210) is obviated by using the derived signal to modulate the forward path (204) substantially simultaneously with modulation of the feedback path (206).

REFERENCES:
patent: 3622913 (1971-11-01), Shipcey
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 4232189 (1980-11-01), Leitch
patent: 4516083 (1985-05-01), Turney
patent: 4607393 (1986-08-01), Nolde et al.
patent: 4653117 (1987-03-01), Heck
patent: 4837853 (1989-06-01), Heck
patent: 5091706 (1992-02-01), Lautzenhiser

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