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1. (WO2018140206) SINGLE-BIT VOLUME CONTROL

Pub. No.:    WO/2018/140206    International Application No.:    PCT/US2018/012401
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Fri Jan 05 00:59:59 CET 2018
IPC: H03M 5/12
H03M 5/14
H03M 7/50
H03M 5/08
H03M 1/68
Applicants: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.
DUEWER, Bruce
KAMKAR, Shafagh
HESTER, Dylan
Inventors: DUEWER, Bruce
KAMKAR, Shafagh
HESTER, Dylan
Title: SINGLE-BIT VOLUME CONTROL
Abstract:
Audio content in a single-bit audio stream can be reproduced at a transducer by mapping the single-bit audio stream to symbols in a multi-bit audio stream. Volume control may be implemented, in part, in the digital domain and, in part, in the analog domain. In the digital domain, when converting the single-bit audio stream to a plurality of symbols, the plurality of symbols is selected based, at least in part, on audio content of the single-bit audio stream and a desired volume level. In the analog domain, when converting an analog current signal output from a current- steering DAC processing the plurality of symbols to an analog voltage signal, an analog gain value may be selected based, at least in part, on the desired volume level.