Abstract: A zero intermediate-frequency (IF) demodulator includes a pair of mixers receiving a quadrature local oscillator signal, for converting the FM-modulated input signal to an in-phase I baseband signal and a quadrature-phase Q baseband signal; each I and Q signal is then delayed and the I and Q signals and the delayed I.sub.d and Q.sub.d signals are arithmetically processed to generate first and second modulation-related signals, which are summed to provide the recovered modulation as an output signal. The arithmetic processing may use additive and/or multiplicative operations.