Loudness maximization with constrained loudspeaker excursion

摘要

An original loudness level of an audio signal is maintained for a mobile device while maintaining sound quality as good as possible and protecting the loudspeaker used in the mobile device. The loudness of an audio (e.g., speech) signal may be maximized while controlling the excursion of the diaphragm of the loudspeaker (in a mobile device) to stay within the allowed range. In an implementation, the peak excursion is predicted (e.g., estimated) using the input signal and an excursion transfer function. The signal may then be modified to limit the excursion and to maximize loudness.

主权项

1. A method of constraining loudspeaker excursion in a mobile station, comprising:
receiving an input audio signal at the mobile station; transforming, in the digital domain, the input audio signal into a plurality of subband signals in the equal rectangular band (ERB) scale; determining a peak excursion, in the digital domain, of a loudspeaker of the mobile station, for either one or more of the entire ERB subbands or certain portions of one or more ERB subbands; performing signal processing on the subband signals based on the peak excursion and a maximum loudspeaker excursion to limit the excursion of the loudspeaker; and combining and outputting the signal processed subband signals to the loudspeaker.