Controlling slew rate
AssigneeCirrus Logic, Inc.
InventorsPeter J. Tonge, John P. Lesso
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Abstract
This application relates to methods and apparatus for controlling slew-rate of components for outputting an analogue output signal. Described is a signal processing circuit having a forward signal path for receiving an input signal and outputting an analogue output signal. The signal processing circuit has a first component located in said forward signal path for outputting the analogue output signal. A predictor is configured to predict a required slew-rate for the first component based on the input signal and a controller is configured to controllably vary an output slew-rate limit of the first component based on the prediction of required slew-rate.
Claims20
A signal processing circuit having a forward signal path for receiving an input signal and outputting an analogue output signal, the signal processing circuit comprising:
- a first component located in said forward signal path for outputting said analogue output signal;
- a predictor configured to predict a required slew-rate for the first component based on the input signal, wherein the prediction of the required slew-rate is a prediction of a slew-rate that will be required for the first component to output said analogue output signal based on the input signal at a look-ahead time in the future;
- and
- a controller for controllably varying an output slew-rate limit of said first component based on said prediction of required slew-rate.
A signal processing circuit having a forward signal path for receiving an input signal and outputting an analogue output signal, the signal processing circuit comprising:
- a first component located in said forward signal path for outputting said analogue output signal;
- a predictor configured to predict a parameter of the input signal related to the slew-rate of the input signal, wherein the prediction of said parameter of the input signal is a prediction of what said parameter will be in the future after a look-ahead time;
- and
- a controller for controlling an output slew-rate limit of said first component based on said prediction of said parameter of the input signal.
An audio processing circuit for receiving an input audio signal and outputting an analogue audio output signal, the audio processing circuit comprising:
- a first component for outputting said analogue audio output signal;
- a predictor configured to predict a slew-rate value based on the input audio signal, wherein said predicted slew-rate value is a prediction of what said slew-rate value will be a time in the future;
- and
- a controller for controlling an output slew-rate limit of said first component based on said predicted slew-rate value.
Dependencies are inferred from the claim text.