US 9,813,814 B1
Enhancing dynamic range based on spectral content of signal
Aniruddha Satoskar, Austin, TX (US); Tejasvi Das, Austin, TX (US); and Ku He, Austin, TX (US)
Assigned to Cirrus Logic, Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Aug. 23, 2016, as Appl. No. 15/244,670.
Int. Cl. H04R 3/00 (2006.01); H04R 3/04 (2006.01); H03G 3/30 (2006.01); H03K 5/1536 (2006.01)
CPC H04R 3/04 (2013.01) [H03G 3/3005 (2013.01); H03G 3/3089 (2013.01); H03K 5/1536 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An apparatus for providing an output signal to an audio transducer, comprising:
a signal path comprising:
an analog signal path portion having an audio input for receiving an analog signal, an audio output for providing an output signal, and a selectable analog gain, and configured to generate the output signal based on the analog signal and in conformity with the selectable analog gain; and
a digital path portion having a selectable digital gain and configured to receive a digital input signal and convert the digital input signal into the analog signal in conformity with the selectable digital gain; and
a control circuit configured to:
determine a spectral content of a signal indicative of the output signal; and
change the selectable digital gain and the selectable analog gain based on the spectral content.