Digital/analogue conversion apparatus
AssigneeTrigence Semiconductor, Inc.
InventorsAKIRA YASUDA, Junichi Okamura
Life of this patent
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Abstract
A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.
Claims12
A digital speaker system comprising:
- a plurality of driver circuits;
- a speaker unit having a plurality of inputs and a corn driven by a plurality of voice coils, each of plurality of inputs corresponding to each of the plurality of voice coils and corresponding to each of plurality of the driver circuits;
- a delta sigma modulator to receive a digital audio signal and generate a first signal;
- and
- a mismatch shaper to convert the first signal to generate a second signal and output the second signal to the plurality of driver circuits which are selected according to a selection history of the plurality of driver circuits,
- wherein each of the plurality of driver circuits amplifies the second signal and generates three valued digital signals by using a switching driver, and
- wherein each of the plurality of inputs is supplied with three valued digital signals generated by a corresponding driver circuit among the plurality of driver circuits.
A digital speaker system comprising:
- a first channel;
- a second channel;
- and
- a plurality of digital speakers, each of the plurality of digital speakers having a corn driven by a plurality of voice coils, and
- each of the first channel and the second channel including:
- a plurality of driver circuits,
- a delta sigma modulator to receive a digital audio signal and generate a first signal,
- a mismatch shaper to convert the first signal to generate a second signal and output the second signal to the plurality of driver circuits which are selected according to a selection history of the plurality of driver circuits,
- wherein each of the plurality of driver circuits amplifies the second signal and generates three valued digital signals by using a switching driver, and
- wherein a first group of the plurality of digital speakers among the plurality of digital speakers receives three valued digital signals from the first channel and a second group among the plurality of digital speakers receives three valued digital signals from the second channel.
Dependencies are inferred from the claim text.