Signal conversion system and method
AssigneeActiwave AB
InventorsErik Lindahl, Pär Gunnars Risberg
Life of this patent
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Abstract
A signal conversion system and method for converting an input signal to a pulse width modulated signal is disclosed. The signal conversion system includes a sample rate converter coupled with an associated pulse width modulation (PWM) module. A hardware and power efficient signal conversion system for resampling an audio input signal with an arbitrary sample rate to a pulse width modulated output audio signal for use in an audio processor and/or reproduction is disclosed. The signal conversion system may be particularly suitable for use in a battery operated consumer electronics device.
Claims19
A method for generating a PWM signal from an input signal, the method comprising:
- generating a carrier signal at a carrier signal frequency;
- comparing the carrier signal with the input signal;
- forming a triggered signal when the carrier signal and the input signal are equal to each other within a predetermined precision based on comparison of the carrier signal with the input signal;
- truncating the triggered signal with a noise shaper to form a truncated signal;
- comparing the truncated signal to the carrier signal to form the PWM signal;
- and
- updating the triggered signal in sync with the carrier signal.
A method for generating a PWM signal from an input signal, the method comprising:
- generating a carrier signal at a carrier signal frequency;
- comparing the carrier signal with the input signal;
- forming a triggered signal when the carrier signal and the input signal are equal to each other within a predetermined precision based on comparison of the carrier signal with the input signal;
- truncating the triggered signal with a noise shaper to form a truncated signal;
- comparing the truncated signal to the carrier signal to form the PWM signal;
- generating a clock signal;
- and
- resampling the input signal at a sample rate greater than the carrier signal frequency to form a resampled signal.
A method for generating a PWM signal from an input signal, the method comprising:
- generating a carrier signal at a carrier signal frequency;
- comparing the carrier signal with the input signal;
- forming a triggered signal when the carrier signal and the input signal are equal to each other within a predetermined precision based on comparison of the carrier signal with the input signal;
- truncating the triggered signal with a noise shaper to form a truncated signal;
- comparing the truncated signal to the carrier signal to form the PWM signal;
- generating a matching carrier signal with a frequency equal to the carrier signal frequency;
- and
- comparing the truncated signal with the carrier signal to form the PWM signal.
Dependencies are inferred from the claim text.