Abstract: A microphone assembly includes a housing including a base, a cover, and a sound port. The microphone assembly further includes an acoustic transducer and an electrical circuit, both of which are disposed in an enclosed volume of the housing. The transducer and electrical circuit work in concert to convert sound waves into a processed digital audio signal. The electrical circuit is configured to process digital data in a series of frames that correspond to a fixed period in time. The electrical circuit is further configured to reduce noise in the resulting signal by varying the current draw required in a randomized or pseudo-randomized fashion between adjacent frames of digital data.

Abstract: A microphone assembly includes a housing including a base, a cover, and a sound port. The microphone assembly further includes an acoustic transducer and an electrical circuit, both of which are disposed in an enclosed volume of the housing. The transducer and electrical circuit work in concert to convert sound waves into a processed digital audio signal. The electrical circuit is configured to process digital data in a series of frames that correspond to a fixed period in time. The electrical circuit is further configured to reduce noise in the resulting signal by varying the current draw required in a randomized or pseudo-randomized fashion between adjacent frames of digital data.

Abstract: The disclosure describes keyword detection in an audio processor and methods therefor including a low-power keyword detection engine (LKDE) and a high-power keyword detection engine (HKDE). In one implementation, the LKDE detects a keyword in data from a single audio source while buffering data from multiple audio sources and, upon detection of a keyword, the HKDE is awakened to verify the previously detected keyword by processing the buffered audio data from the multiple sources.

Abstract: An amplifier includes an input stage, a comparator coupled to an output of the differential input stage, and a trimming controller coupled to an output of the comparator. The input stage includes a plurality of trim devices coupled in parallel with a first input device. The trimming controller is adapted to configure the trim devices based on an output of the comparator. The trim devices may selectively control a total effective device area of the first input device. Each of the trim devices, when enabled, may add a specified area to the total effective device area of the first input device. The input stage may also include a second plurality of trim devices coupled in parallel with a second input device.

Abstract: A circuit and method for signal amplification is provided. The circuit includes an amplifier including an input amplifier that is arranged to receive an input analog signal, and to provide an input amplifier output signal by amplifying the input analog signal. The amplifier further includes a DC offset correction circuit that is arranged to determine a DC offset correction for the input amplifier each time the amplifier is powered up. The DC offset correction is performed by iteratively adjusting a DC offset of the input amplifier until the input amplifier output DC offset is zero when the input analog AC signal is zero, within a predetermined tolerance. The DC offset correction circuit is further arranged to provide the determined DC offset correction to the input amplifier during operation of the amplifier.