AM demodulation receiver using digital signal processor

Details AM demodulation receiver using digital signal processor AM demodulation receiver using digital signal processor

1993-07-09

1994-08-16

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

329363, 375 41, 455323, 455337, H03D 102, H04B 126

Patent

active

053390407

ABSTRACT:
An amplitude modulated (AM) radio receiver uses a digital signal processor, responsive to in-phase (I) and quadrature-phase (Q) component signals, to compensate for carrier energy removed by a capacitive coupling circuit. A quadrature mixer converts the received AM signal to the I and Q component signals representative of the AM signal, and a signal filter passes a desired frequency segment of the I and Q component signals. A capacitive coupling circuit couples the I and Q component signals to provide representative I and Q signals with no DC bias to the input of an analog-to-digital converter. The analog-to-digital converter converts the representative unbiased I and Q signals to digital I and Q signals for processing by the digital signal processor. The digital signal processor then: (a) determines the absolute values of the I and Q digital signals; (b) compares the absolute value of the I digital signal to the absolute value of the Q digital signal and determines which value is greater; and in response to the outcome of the comparison, provides a digital output word as function of one of the following terms

REFERENCES:
patent: 4631485 (1986-12-01), Torelli et al.
patent: 5179731 (1993-01-01), Trankle et al.

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