Waveform shaping system to prevent electrical and mechanical saturation in loud speakers

摘要

Peak reduction and power limitations are used to prevent distortion and protect components. In a cellular telephone, peak reduction can be based on battery power level to prevent electrical distortion from saturation. In addition peak reduction can be used to prevent mechanical distortion such as rub and buzz. Dynamic range compression can be used for peak reduction. In another application dynamic range compression can be used to control the power output to protect a speaker from damage. One example of a dynamic range compressor/peak limiter comprises a look-ahead buffer and an analysis engine. For example, the look-ahead buffer holds a window of samples of a signal. The analysis engine selects a gain envelope function on the basis of the samples, for example, by selecting the Pth sample in the buffer whenever that sample exceeds a given threshold.

主权项

1. A system comprising:
an audio driver including:
a displacement model operable to convert a digital audio signal into a displacement signal;a look-ahead buffer operable to hold a plurality of samples of the displacement signal;an analysis module operable to determine whether a sample of the plurality of samples in the look-ahead buffer has a value which exceeds a threshold value, and if the sample exceeds the threshold value, to apply a gain envelope function to the plurality of samples in the look-ahead buffer; anda model inverse operable to convert the displacement signal back into the digital audio signal.