Signal modulation apparatus and signal modulation method
AssigneeNEC Corporation
InventorMasaaki Tanio
Life of this patent
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Abstract
A signal modulation apparatus includes: a reference signal generator that generates an analog reference signal by removing at least one harmonic signal component corresponding to at least one higher-order frequency from a triangular wave signal; a modulation signal generator that performs pulse width modulation for comparing the analog reference signal with an analog input signal, thereby to generate an analog modulation signal; a digital signal converter that converts the analog modulation signal to a digital output signal; and a nonlinear converter that performs nonlinear conversion corresponding to waveform conversion for converting the triangular wave signal to the analog reference signal, on the digital output signal or the analog input signal.
Claims10
A signal modulation apparatus comprising:
- a reference signal generator configured to generate an analog reference signal by performing a predetermined nonlinear transformation to remove at least one harmonic signal component corresponding to at least one higher-order frequency from a triangular wave signal;
- a modulation signal generator configured to perform pulse width modulation for comparing the analog reference signal with an analog input signal, thereby to generate an analog modulation signal;
- a digital signal converter configured to convert the analog modulation signal to a digital output signal;
- and
- a nonlinear converter configured to perform nonlinear conversion, corresponding to the predetermined nonlinear transformation, on the digital output signal or the analog input signal.
A signal modulation method comprising:
- generating an analog reference signal by performing a predetermined nonlinear transformation to remove at least one harmonic signal component corresponding to at least one higher-order frequency from a triangular wave signal;
- performing pulse width modulation for comparing the analog reference signal with an analog input signal, thereby to generate an analog modulation signal;
- converting the analog modulation signal to a digital output signal;
- and
- performing nonlinear conversion, corresponding to the predetermined nonlinear transformation, on the digital output signal or the analog input signal.
Dependencies are inferred from the claim text.