Digital speaker driving apparatus
First Claim
Patent Images
1. A headphone apparatus having a digital signal source from a mobile electronic device comprising:
- a digital speaker having s number of digital signal terminals; and
a digital speaker driving apparatus connected to the mobile electronic device and driving the digital speaker including;
a Δ
Σ
modulator modulating a digital input signal inputted from the mobile electronic device and outputting an n bit digital signal;
a post filter connected to the Δ
Σ
modulator and outputting an m bit digital signal obtained by miss-match shaping the n bit digital signal; and
s number of driving circuits corresponding to the s number of digital signal terminals, one part of the m bit digital signal being inputted to the s number of driving circuits and the s number of driving circuits outputting a digital signal,wherein the s numbers of both the digital signal terminals and the driving circuits are less than a number of discrete values represented by a number of bits of the digital input signal inputted from the mobile electronic device.
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Abstract
A digital sound system suitable for a digital speaker device to directly convert analog sound by a circuit using a ΔΣ modulator and a mismatch shaping filter circuit to output a plurality of digital signals and a plurality of speakers driven by the plurality of digital signals. A digital speaker driving device includes a ΔΣ modulator, a post filter, s driving circuits, and a power supply circuit to supply power to the ΔΣ modulator, the post filter and the s driving elements, and the s driving circuits are adapted to s digital signal terminals.
103 Citations
9 Claims
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1. A headphone apparatus having a digital signal source from a mobile electronic device comprising:
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a digital speaker having s number of digital signal terminals; and a digital speaker driving apparatus connected to the mobile electronic device and driving the digital speaker including; a Δ
Σ
modulator modulating a digital input signal inputted from the mobile electronic device and outputting an n bit digital signal;a post filter connected to the Δ
Σ
modulator and outputting an m bit digital signal obtained by miss-match shaping the n bit digital signal; ands number of driving circuits corresponding to the s number of digital signal terminals, one part of the m bit digital signal being inputted to the s number of driving circuits and the s number of driving circuits outputting a digital signal, wherein the s numbers of both the digital signal terminals and the driving circuits are less than a number of discrete values represented by a number of bits of the digital input signal inputted from the mobile electronic device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A personal computer comprising:
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a digital speaker having s number of digital signal terminals; and a digital speaker driving apparatus driving the digital speaker including; a Δ
Σ
modulator modulating a digital input signal and outputting an n bit digital signal;a post filter connected to the Δ
Σ
modulator and outputting an m bit digital signal obtained by miss-match shaping the n bit digital signal; ands number of driving circuits, one part of the m bit digital signal being inputted to the s number of driving circuits, the s number of driving circuits outputting a digital signal, wherein the s numbers of both the digital signal terminals and the driving circuits are less than a number of discrete values represented by a number of bits of the digital input signal. - View Dependent Claims (9)
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Specification