发明名称 |
Systems and methods for supply-based gain control of an audio output signal |
摘要 |
An audio device may include an electrical terminal for coupling a transducer device to the audio device and an audio circuit for generating an analog audio signal coupled to the electrical terminal. The audio circuit may include a pre-amplifier stage, an amplifier, and a gain selector. The pre-amplifier stage may apply a selectable gain to an audio input signal to generate a pre-amplified analog audio signal, wherein the pre-amplifier stage is powered by a first power supply. The amplifier may amplify the pre-amplified analog audio signal to generate the analog audio signal, wherein the amplifier is powered from a second power supply isolated from the first power supply. The gain selector may select the selectable gain based on a level of the first power supply, such that a difference between the second power supply and the analog audio signal is more than a predetermined headroom threshold voltage. |
申请公布号 |
US9584082(B1) |
申请公布日期 |
2017.02.28 |
申请号 |
US201314028769 |
申请日期 |
2013.09.17 |
申请人 |
Cirrus Logic, Inc. |
发明人 |
Ilango Anand;Satoskar Aniruddha;Thandri Bharath Kumar |
分类号 |
H03G3/00 |
主分类号 |
H03G3/00 |
代理机构 |
Jackson Walker L.L.P. |
代理人 |
Jackson Walker L.L.P. |
主权项 |
1. An audio device comprising:
an electrical terminal for coupling a transducer device to the audio device; an audio circuit for generating an analog audio signal to the electrical terminal, the audio circuit comprising:
a pre-amplifier stage for applying a selectable gain to an audio input signal to generate a pre-amplified analog audio signal, wherein the pre-amplifier stage is powered by a first power supply;an amplifier for amplifying the pre-amplified analog audio signal to generate the analog audio signal, wherein the amplifier is powered from a second power supply isolated from the first power supply; anda gain selector for selecting the selectable gain based on a level of the first power supply, such that a difference between a magnitude of the second power supply and a magnitude of the analog audio signal is more than a predetermined headroom threshold voltage. |
地址 |
Austin TX US |