Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2006-05-02
2006-05-02
Nguyen, John (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S144000, C341S152000
Reexamination Certificate
active
07038606
ABSTRACT:
An audio signal reproduction device of the invention has a seventh-order delta-sigma modulation circuit that receives a PCM signal and that performs delta-sigma modulation on the PCM signal, a PWM circuit that performs pulse width modulation on the signal outputted from the seventh-order delta-sigma modulation circuit to produce a one-bit digital signal, a switching amplifier that converts the one-bit digital signal into an analog signal and that then amplifies it, and a low-pass filter that eliminates high-frequency components of the analog signal. This configuration permits size and weight reduction.
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Hongoh Tsunehiko
Yamamoto Hirotoshi
Mai Lam T.
Nguyen John
Sharp Kabushiki Kaisha
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