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US 2025/0193632 A1Published application
Filterbank Pitchshifter
AssigneeEventide Inc.
InventorsCorey Kereliuk, Woodrow Q. Herman, Russell Wedelich
Life of this patent
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Abstract
Technique and mechanism for processing polyphonic audio signals. Processing includes filtering the audio signals to generate a set of narrow band signals, estimating an instantaneous magnitude and frequency associated with the narrow band signals and driving a bank of sinusoidal oscillators based on the instantaneous magnitude and frequency to create an output audio signal.
Claims21
An audio signal processing method, comprising:
- filtering an input audio signal to generate a real signal and an imaginary signal;
- generating a set of narrowband signals using the real signal and the imaginary signal;
- generating one or more instantaneous frequency estimates and one or more instantaneous magnitude estimates using the real signal and the imaginary signal;
- modifying the one or more instantaneous frequency estimates or the one or more instantaneous magnitude estimates as part of an audio effect to produce a modified set of instantaneous frequency estimates or a modified set of instantaneous magnitude estimates;
- and
- synthesizing the modified set of instantaneous frequency estimates or the modified set of instantaneous magnitude estimates to produce an output audio signal.
3 more elements
An audio processing apparatus, comprising:
- a memory storing instructions;
- and
- one or more processing devices coupled to the memory, the instructions causing the one or more processing devices to:
- filter an input audio signal to generate a real signal and an imaginary signal;
- generate a set of narrowband signals using the real signal and the imaginary signal;
- generate one or more instantaneous frequency estimates and one or more instantaneous magnitude estimates using the real signal and the imaginary signal;
- modify the one or more instantaneous frequency estimates or the one or more instantaneous magnitude estimates as part of an audio effect to produce a modified set of instantaneous frequency estimates or a modified set of instantaneous magnitude estimates;
- and
- synthesize the modified set of instantaneous frequency estimates or the modified set of instantaneous magnitude estimates to produce an output audio signal.
6 more elements
Dependencies are inferred from the claim text.