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US 2014/0236332 A1Published application
Digital acoustic system
AssigneeTrigence Semiconductor, Inc.
InventorsAkira YASUDA, Jun-ichi OKAMURA
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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.
Claims20
A digital acoustic system including a driving circuit configured to drive s number of driving elements for conversion to analog audio, the system comprising:
- a modulator configured to read the s number of driving elements, to modulate a digital input signal thereby ΔΣ-modulating an n bit digital signal, to mismatch shape the n bit digital signal, and to convert the n bit digital signal to m number of digital signals;
- a parallel-serial converter configured to convert the m number of digital signals converted by the modulator to a serially transmitted digital signal;
- and
- a serial-parallel converter configured to convert and reconstruct the digital signal converted by parallel-serial converter to m number of digital signals;
- wherein the driving circuit receives the m number of digital signals reconstructed by the serial-parallel converter, drives s number of driving elements, and converts the m number of digital signals to analog audio.
2 more elements
A digital acoustic system comprising:
- a ΔΣ-modulator configured to modulate a digital input signal and to output an n bit digital signal;
- a post filter connected to the ΔΣ-modulator and configured t to convert the n bit digital signal to m number of digital signals by mismatch shaping;
- a parallel-serial converter configured to convert the m number of digital signals converted by the post filter to a serially transmitted digital signal;
- and
- a serial-parallel converter configured to convert and reconstruct the digital signal converted by the parallel-serial converter to m number of digital signals;
- 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;
- and
- a storage device configured to store a digital signal converted by the parallel-serial converter, to read out a stored digital signal, and to output the stored digital signal to the serial-parallel converter, the storage device being configured to store and to read out a digital signal converted by the parallel-serial converter to and from an attachable and detachable storage media.
5 more elements
A digital acoustic system comprising:
- a processor configured to convert a digital input 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 the 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 ΔΣ-modulator modulating a digital signal and outputting an n bit digital signal, and as a post filter connected to the ΔΣ-modulator and configured to convert the n bit digital signal to m number of digital signals by mismatch shaping.
3 more elements
A digital acoustic system comprising:
- a processor configured to convert a digital input 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 ΔΣ-modulator modulating a digital 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.
5 more elements
A digital acoustic system comprising:
- a digital processor configured to convert a digital input signal to m number of digital signals for conversion to analog audio by driving s number of driving elements;
- and
- a format converter configured to convert a format of the m number of digital signals, converted by the digital processor, for storing in a storage media;
- wherein the digital signal processor is controlled by a program for reading out the s number of driving elements, for operating the digital signal processor as a ΔΣ-modulator modulating a digital signal and outputting an n bit digital signal, and as a post filter connected to the ΔΣ modulator and configured to convert the n bit digital signal to m number of digital signals, which are output, by mismatch shaping.
1 more element
A digital reproduction device comprising:
- a driving circuit configured to drive a driving element for conversion to analog audio by reading out a digital signal from a storage media stored with a digital signal output by a post filter configured to perform mismatch shaping on an output of a ΔΣ-modulator modulating the digital input signal;
- wherein the number of driving elements of the driving circuit is included in the digital signal stored in the storage media.
A digital reproduction device comprising:
- a driving circuit configured to drive a driving element for conversion to analog audio by receiving a digital signal output by a post filter configured to perform mismatch shaping on an output of a ΔΣ-modulator modulating a digital input signal;
- wherein the number of driving elements of the driving circuit is included in the received digital signal.
Dependencies are inferred from the claim text.