Filters and filter chains
AssigneeCirrus Logic, Inc.
InventorJohn P. Lesso
Life of this patent
Estimating the term…
Abstract
An apparatus, comprising: an audio input for receiving an input audio signal; an tuning input for receiving a tuning signal; a filter chain comprising a plurality of filters for filtering the audio signal to produce a filtered input audio signal, the filter chain comprising: a first filter module operating at a first sampling rate; and a second filter module operating at a second sampling rate greater than the first sampling rate, wherein a phase response of the first filter module is dependent on the tuning input and wherein a magnitude response of the first filter module is substantially independent of the tuning input.
Claims25
An apparatus, comprising:
- an audio input for receiving an input audio signal;
- an tuning input for receiving a tuning signal;
- a filter chain comprising a plurality of filters for filtering the audio signal to produce a filtered input audio signal, the filter chain comprising:
- a first filter module operating at a first sampling rate;
- and
- a second filter module operating at a second sampling rate greater than the first sampling rate,
- wherein a phase response of the first filter module is dependent on the tuning input and wherein a magnitude response of the first filter module is substantially independent of the tuning input.
An audio playback device, comprising:
- an audio input for receiving an input audio signal from an audio source;
- an tuning input for receiving a tuning signal configurable by a user of the audio playback device;
- an audio output for delivering a filtered audio signal to an audio output device;
- a filter chain comprising a plurality of filters for filtering the input audio signal to produce the filtered audio signal, the filter chain comprising:
- a first filter module operating at a first sampling rate;
- and
- a second filter module operating at a second sampling rate greater than the first sampling rate,
- wherein a phase response of the first filter module is dependent on the tuning input and wherein a magnitude response of the first filter module is substantially independent of the tuning input.
Dependencies are inferred from the claim text.