Abstract: A frequency-dependent signal limiter using a paired combination of a bandpass filter (or “selection filter”) and an attenuating equalizing filter (or “cutting filter”) limit the amount of distortion generated by an audio output device in an acoustic rendering system. A bank of one or more of these pairs in series can be used to limit selected frequencies identified as primary causes of distortion in the audio output device to specified levels that avoid distortion.

Abstract: Techniques performed by a data processing system for operating a speaker disposed within a sealed enclosure herein include obtaining a first input signal to be output by the speaker; determining a first volume level associated with the first input signal; selecting a first Linkwitz Transform and a first Multiband Compressor (MBDRC) from volume- dependent configuration data based on the first volume level; generating a first intermediate signal by applying the first Linkwitz Transform to the first input signal to increase a low- frequency response of the speaker; generating a first output signal by applying the first MBDRC to the first intermediate signal by compressing the at least a portion of the first intermediate signal; and driving the speaker to produce first audio output using the first output signal.

Abstract: A device for operating a toilet seat has a user-operated unit for lifting toilet seat; and a timer operative for lowering the toilet seat after elapsing of a predeterminded time from a time point when the seat was lifted.

Abstract: An air freshening device a toilet, comprising a source of air freshening medium; and an actuating element operatable by a seat of a toilet so that when a user stands up from the seat said actuating element causes discharge of the air freshening medium from said source.