Audio signal processor
AssigneeRUWISCH, Dietmar
InventorDietmar Ruwisch
Life of this patent
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Abstract
An audio signal processor generating an analog audio signal with directional characteristic from at least two 1-bit audio signals of digital microphones comprises a shift register of length n for bit-clocked throughput of at least one 1-bit audio signal and a combiner for combining at least two 1-bit audio signals to an interlaced 1-bit audio signal with doubled bit frequency.
Claims20
An audio signal processor for generating an analog audio signal with directional characteristic from at least two pulse-density-modulated 1-bit audio signals of digital microphones, the audio signal processor comprising:
- a first shift register of length n, n>0, being adapted to bit-clocked put through of a first pulse-density-modulated 1-bit audio signal of a first digital microphone to produce a first shift register output signal with single bit clock frequency;
- and
- a combiner being adapted to combine the shift register output signal and a second pulse-density-modulated 1-bit audio signal of a second digital microphone to generate an interlaced 1-bit audio output signal with double bit clock frequency,
- wherein the interlaced 1-bit audio output signal forms the analog audio signal.
An audio system comprising:
- a first digital microphone;
- a second digital microphone;
- an audio signal processor comprising:
- a first shift register of length n, n>0, being adapted to bit-clocked put through of a first pulse-density-modulated 1-bit audio signal of the first digital microphone to produce a first shift register output signal with single bit clock frequency;
- and
- a combiner being adapted to combine the shift register output signal and a second pulse-density-modulated 1-bit audio signal of the second digital microphone to generate an interlaced 1-bit audio output signal with double bit clock frequency, wherein the interlaced 1-bit audio output signal forms an analog audio signal;
- a digital audio system receiving the first and second pulse-density-modulated 1-bit audio signals of the first and second digital microphones;
- and
- an analog audio system receiving the analog output signal from the audio signal processor.
A method for generating an analog audio signal with directional characteristic from at least two pulse-density-modulated 1-bit audio signals of digital microphones, comprising:
- at an audio signal processor, bit-clocked putting through of a first pulse-density-modulated 1-bit audio signals of a first digital microphone in a shift register of length n, n>0, and producing a shift register output signal with single bit frequency;
- combining the shift register output signal and a second pulse-density-modulated 1-bit audio signal of a second digital microphone and generating an interlaced 1-bit audio output signal with doubled bit frequency;
- filtering the interlaced 1-bit audio output signal;
- and
- generating the analog audio signal.
A computer program product comprising at least one non-transitory computer-readable medium storing instructions which when executed by a data processing device perform:
- at an audio signal processor, bit-clocked putting through of a first pulse-density-modulated 1-bit audio signals of a first digital microphone in a shift register of length n, n>0, and producing a shift register output signal with single bit frequency;
- combining the shift register output signal and a second pulse-density-modulated 1-bit audio signal of a second digital microphone and generating an interlaced 1-bit audio output signal with doubled bit frequency;
- filtering the interlaced 1-bit audio output signal;
- and
- generating the analog audio signal.
Dependencies are inferred from the claim text.