System for adjusting perceived loudness of audio signals

摘要

A method of adjusting a loudness of an audio signal may include receiving an electronic audio signal and using one or more processors to process at least one channel of the audio signal to determine a loudness of a portion of the audio signal. This processing may include processing the channel with a plurality of approximation filters that can approximate a plurality of auditory filters that further approximate a human hearing system. In addition, the method may include computing at least one gain based at least in part on the determined loudness to cause a loudness of the audio signal to remain substantially constant for a period of time. Moreover, the method may include applying the gain to the electronic audio signal.

主权项

1. A method of adjusting a loudness of an audio signal, the method comprising:
receiving an electronic audio signal comprising two or more channels of audio; analyzing a phase between a portion of each of the two or more audio channels to determine a number of samples in the portion of the two or more audio channels that have a same phase; comparing the number of samples that have the same phase to a threshold number to determine whether the samples correspond primarily to voice or background noise; in response to determining that the samples correspond primarily to voice due to the number of samples that have the same phase meeting exceeding the threshold number,
selecting a channel of the two or more audio channels, said selecting comprising:
determining a dominant channel of the two or more audio channels, andselecting the dominant channel;using one or more processors to process the selected channel to determine a loudness of a portion of the audio signal;computing at least one gain based at least in part on the determined loudness; andapplying the at least one gain to the electronic audio signal; and in response to determining that the samples correspond to background noise due to the number of samples that have the same phase being below the threshold number, bypassing said steps of using, computing, and applying.