Rf level detection for desired channel among multiple broadcast channels

Abstract

Exemplary aspects are directed to FM-radio receivers and methods to assess signals in a desired channel. In one example, a method includes demodulating a broadcast signal associated with a radio-frequency transmission using a desired-channel bandwidth setting and, in response, provide a first frequency-selective demodulated signal (e.g., MPX signal in an FM broadcast) and provide a magnitude indication, such as the raw signal level, of a second demodulated signal that is less frequency selective than the first frequency-selective demodulated signal. A level estimation circuit is used to assess a running representation (or effective average) of the magnitude indication over time. In this manner, a speed or rate at which the level estimator assesses the running representation is controlled based on a degree of deviation or offset as indicated by the first frequency-selective demodulated signal relative to a carrier frequency used for the broadcast signal.