Inversion prevention device

Details Inversion prevention device Inversion prevention device

1994-03-31

1997-06-10

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375342, 375351, 329318, 455 48, 455303, H03D 318

Patent

active

056384076

ABSTRACT:
An inversion prevention device to prevent inversion and provide the best S/N ratio detects a point where the zero crossing is missing from a quantized FM signal. An output is provided by switching between the digital FM signal and the output signal of at least one sideband suppression filter based on a result of the inversion detection. Alternatively, an output is provided by switching between the digital FM signal and a specified value based on a result of the inversion detection. As a further alternative, an output is provided by switching between the digital FM signal, the output signal of a low-sideband emphasis filter and the output signal of a sideband suppression filter based on a result of the inversion detection.

REFERENCES:
patent: 4862099 (1989-08-01), Nakai et al.
patent: 4906942 (1990-03-01), Nakai et al.
patent: 4910799 (1990-03-01), Takayama
patent: 5185679 (1993-02-01), Mishima et al.
patent: 5222106 (1993-06-01), Satoh et al.
patent: 5375143 (1994-12-01), Kazecki et al.

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