公开(公告)号：US11581865B2

公开(公告)日：2023-02-14

申请号：US17323551

申请日：2021-05-18

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Miles Klett Roberto

IPC分类号： H03G9/02 ,  H03G7/00 ,  H03F1/02 ,  H03F3/217

摘要： An audio system has an amplifier for driving an audio actuator and includes a switched-mode power supply that draws power from a power source (e.g., battery) to supply power to the amplifier, a capacitor charged by the switched-mode power supply to supply power to the amplifier, and a feed-forward compressor that performs dynamic range compression of an audio input to provide an audio output for amplification by the amplifier. The compressor includes a sidechain frequency-biasing filter that generates a frequency-biased version of the audio input that is attenuated as frequency increases which causes the compressor to decrease the compression as frequency increases. A control block limits current drawn from the battery by the switched-mode power supply independent of audio input frequency, but the frequency-biasing filter enables the amplifier to service audio power transients greater than the current-limited power supply can supply by advantageously concurrently sourcing extra power from the capacitor.

公开(公告)号：US20220376668A1

公开(公告)日：2022-11-24

申请号：US17323551

申请日：2021-05-18

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Miles Klett Roberto

IPC分类号： H03G9/02 ,  H03G7/00 ,  H03F3/217 ,  H03F1/02

摘要： An audio system has an amplifier for driving an audio actuator and includes a switched-mode power supply that draws power from a power source (e.g., battery) to supply power to the amplifier, a capacitor charged by the switched-mode power supply to supply power to the amplifier, and a feed-forward compressor that performs dynamic range compression of an audio input to provide an audio output for amplification by the amplifier. The compressor includes a sidechain frequency-biasing filter that generates a frequency-biased version of the audio input that is attenuated as frequency increases which causes the compressor to decrease the compression as frequency increases. A control block limits current drawn from the battery by the switched-mode power supply independent of audio input frequency, but the frequency-biasing filter enables the amplifier to service audio power transients greater than the current-limited power supply can supply by advantageously concurrently sourcing extra power from the capacitor.