Digital acoustic system
AssigneeTrigence Semiconductor, Inc.
InventorsAkira Yasuda, Jun-ichi Okamura
Life of this patent
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Abstract
Provided is a digital acoustic system comprising: a ΔΣ modulator that modulates a digital input signal and outputs a digital signal; a post-filter that is connected to the ΔΣ modulator and which performs mismatch shaping to convert the digital signal; a parallel-serial converter that converts the digital signal converted by the post-filter into a digital signal which is serially transmitted; a serial-parallel converter that restores the digital signal converted by the parallel-serial converter; and a drive circuit which receives the digital signal restored by the serial-parallel converter, and drives drive elements to convert the signal into an analog audio signal.
Claims1
A digital acoustic system comprising:
- a processor configured to convert a single digital input audio signal to m number of digital signals;
- a parallel-serial converter configured to convert the m number of digital signals converted by the processor to a serially transmitted digital signal;
- a serial-parallel converter configured to convert and reconstruct the digital signal converted by parallel-serial converter to m number of digital signals;
- and
- a driving circuit configured to receive the m number of digital signals reconstructed by the serial-parallel converter, to realize conversion to analog audio by driving s number of driving elements;
- wherein the processor is controlled by a program for reading out the s number of driving elements, for operating the processor as a single ΔΣ-modulator modulating the single digital input audio signal and outputting an n bit digital signal, and as a post filter connected to the ΔΣ-modulator and configured to mismatch shape the n bit digital signal and convert the n bit digital signal to m number of digital signals;
- and
- the number of signals output by the parallel-serial converter is smaller than the number of signals input to the parallel-serial converter, and a signal output by the parallel-serial converter includes data necessary for demodulation by the serial-parallel converter.
Dependencies are inferred from the claim text.