Digital/analog conversion apparatus
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.
1. A conversion device for supplying a plurality of digital signals to a plurality of elements for driving at least one speaker, the conversion device for:
receiving a digital audio signal;
converting the digital audio signal to the plurality of digital signals, each of the plurality of digital signals having three values; and
outputting each of the plurality of digital signals to each of the plurality of elements respectively,
wherein converting the digital audio signal includes generating a first signal by modulating the digital audio signal by using a delta sigma modulator, generating a plurality of second signals by converting the first signal, and generating each of the plurality of digital signals by supplying each of the plurality of second signals to each of a plurality of driver circuits, and
wherein the second signal is supplied to one of the plurality of the driver circuits, which is selected according to a selection history of the plurality of driver circuits.
2. The conversion device according to claim 1 , wherein at least one of the plurality of the driver circuit includes a switching driver.
3. The conversion device according to claim 1 , wherein the plurality of elements for driving a speaker is a plurality of voice coils.
4. The conversion device according to claim 1 , wherein the plurality of elements for driving a speaker is a plurality of piezoelectric elements.