Digital PWM amplifier with simulation-based feedback
First Claim
1. A system comprising:
- a signal processing plant implemented in a digital pulse width modulation (PWM) amplifier, wherein the plant is configured to receive and process an input audio signal to generate an output audio signal;
a simulator configured to model processing of audio signals by the plant, wherein the simulator is configured to receive the input audio signal and to generate a simulator output signal; and
a subtractor configured to receive the output audio signal and the simulator output signal and to generate a correction signal, wherein the input audio signal is modified based on the correction signal.
6 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for performance improvements in digital switching amplifiers using simulation-based feedback. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a simulator configured to model processing of audio signals by the plant. The outputs of the plant and the simulator are provided to a subtractor, the output of which is then added to the input audio signal as feedback. The plant may consist of a modulator and power switch, a noise shaper, or any other type of plant. An analog-to-digital converter (ADC) may be provided to convert the output audio signal to a digital signal for input to the subtractor. Filtering may be implemented before or after the ADC, and a decimator may be placed after the ADC if it is an oversampling ADC.
-
Citations
20 Claims
-
1. A system comprising:
-
a signal processing plant implemented in a digital pulse width modulation (PWM) amplifier, wherein the plant is configured to receive and process an input audio signal to generate an output audio signal; a simulator configured to model processing of audio signals by the plant, wherein the simulator is configured to receive the input audio signal and to generate a simulator output signal; and a subtractor configured to receive the output audio signal and the simulator output signal and to generate a correction signal, wherein the input audio signal is modified based on the correction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for correcting an output audio signal generated by a signal processing plant in a digital pulse width modulation (PWM) amplifier, the method comprising:
-
receiving an input audio signal; providing the input audio signal to a signal processing plant and to a simulator, wherein the simulator is configured to model processing of signals by the plant; processing the input audio signal within the plant to generate a plant output signal; processing the input audio signal with the simulator to generate a simulator output signal; determining a difference between the plant output signal and the simulator output signal; and modifying the input audio signal based on the difference between the plant output signal and the simulator output signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification