Split-band compression circuit, audio signal processing method and audio signal processing system
AssigneeAmTRAN Technology Co., Ltd.
InventorMu-Hsuan Lee
Life of this patent
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Abstract
A split-band compression circuit includes first stage filters, split-band limiters, and second stage filters. The first stage filters are configured to receive and filter an input signal to output first split-band signals. The split-band limiters are coupled to the first stage filters respectively, and configured to perform compression on the first split-band signals to output second split-band signals. The second stage filters are coupled to the split-band limiters respectively, and configured to filter corresponding second split-band signals to output output signals. The first stage filter and the second stage filter corresponding to the same split-band limiter have different cut-off frequencies respectively.
Claims10
A split-band compression circuit, comprising:
- a plurality of first stage filters configured to receive and filter an input signal so as to output a plurality of first split-band signals;
- a plurality of split-band limiters electrically coupled to the first stage filters respectively, and configured to perform compression on the first split-band signals so as to output a plurality of second split-band signals;
- and
- a plurality of second stage filters electrically coupled to the split-band limiters respectively, and configured to filter corresponding second split-band signals so as to output a plurality of output signals;
- wherein the first stage filter and the second stage filter corresponding to the same split-band limiter have different cut-off frequencies.
An audio signal processing method, comprising:
- filtering, by a plurality of first stage filters, an input signal according to a plurality of first stage cut-off frequencies, so as to divide the input signal into a plurality of first split-band signals corresponding to different frequency bands;
- performing compression, by a plurality of split-band limiters, on the first split-band signals respectively, so as to output a plurality of compressed second split-band signals;
- and
- filtering, by a plurality of second stage filters, the second split-band signals respectively according to a plurality of second stage cut-off frequencies that are different from the first stage cut-off frequencies, so as to output a plurality of output signals.
An audio signal processing system, comprising:
- a signal input terminal configured to receive an input signal;
- a processor electrically coupled to the signal input terminal and configured to execute an audio signal processing method to output a mixed signal;
- a power amplifier electrically coupled to the processor and configured to amplify the mixed signal and output an amplified mixed signal;
- and
- a speaker electrically coupled to the power amplifier and configured to receive the amplified mixed signal and output an audio signal;
- wherein the audio signal processing method executed by the processor comprises:
- filtering, by a plurality of first stage filters, an input signal according to a plurality of first stage cut-off frequencies, so as to divide the input signal into a plurality of first split-band signals corresponding to different frequency bands;
- performing compression, by a plurality of split-band limiters, on the first split-band signals respectively, so as to output a plurality of compressed second split-band signals;
- filtering, by a plurality of second stage filters, the second split-band signals according to a plurality of second stage cut-off frequencies that are different from the first stage cut-off frequencies respectively, so as to output a plurality of output signals;
- and
- receiving and mixing, by a mixer unit, the output signals, so as to output the mixed signal.
Dependencies are inferred from the claim text.