US 12,711,972 B2 · Multi-rate audio mixing

Abstract

This disclosure provides methods, components, devices and systems for multi-rate audio mixing. Some aspects more specifically relate to mixing audio streams with different sample rates. In some examples, an audio source device may convert audio streams with different sample rates to the frequency domain using a modified discrete cosine transform (MDCT), and the audio source device may mix the audio streams with different sample rates in the frequency domain. The audio source device may apply a pre-emphasis filter after mixing the audio streams in the frequency domain. An audio stream with a higher sample rate may be down-sampled by dropping frequency bins after converting the audio stream to the frequency domain. Additionally, or alternatively, an audio stream with a lower sample rate may be up-sampled by padding frequency bins of the frequency domain-converted audio stream.

Claims18

Dependent claims

A first wireless device, comprising:

a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the first wireless device to:
input a first media stream into a first frequency domain converter based at least in part on a first sample rate of the first media stream;
input a second media stream into a second frequency domain converter based at least in part on a second sample rate of the second media stream that is different from the first sample rate of the first media stream;
select a first quantity of frequency bins for a mixed media stream based at least in part on a first radio bearer for the mixed media stream;
mix a first output from the first frequency domain converter with a second output from the second frequency domain converter to obtain a mixed frequency domain output, wherein the mixed frequency domain output corresponds to the first quantity of frequency bins;
encode the mixed frequency domain output to obtain the mixed media stream;
and
transmit the mixed media stream comprising the first media stream and the second media stream to a second wireless device.

5 more elements

Dependencies are inferred from the claim text.

Multi-rate audio mixing

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Multi-rate audio mixing

Life of this patent

Abstract

Claims18