Digital audio filters for variable sample rates

摘要

Various exemplary embodiments relate to a method and apparatus for processing audio signals to influence the reproduction of the audio signals. The apparatus may include a speaker, a headphone (over-the-ear, on-ear, or in-ear), a microphone, a computer, a mobile device, a home theater receiver, a television, a Blu-ray (BD) player, a compact disc (CD) player, a digital media player, or the like. The apparatus may be configured to receive a virtualization profile including a digital audio filter with a design sample rate, resample the virtualization profile to a different sample rate, filter the audio signal with the resampled virtualization profile, and reproduce the filtered audio signal as sound.

主权项

1. A method for processing an audio signal to influence the reproduction of the audio signal, comprising:
sending a request to a server computer for a virtualization profile, wherein the request specifies a requested sample rate for the virtualization profile, and wherein the virtualization profile has a design sample rate and defines a digital audio filter; receiving from the server computer the virtualization profile with the requested sample rate; resampling a continuous-time bandlimited impulse response (CBIR) associated with the virtualization profile at the requested sample rate, wherein resampling the CBIR at a lower sample rate than the design sample rate results in fewer filter coefficients and wherein resampling the CBIR at a higher sample rate than the design sample rate results in more filter coefficients; and filtering the audio signal based on at least the virtualization profile by performing a convolution of the audio signal with the virtualization profile with the requested sample rate.