Signal processing
AssigneeST-Ericsson SA
InventorsChristian Fraisse, Angelo Nagari
Life of this patent
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Abstract
The electronic device and a corresponding signal processing method disclosed herein reduces electromagnetic noise. To that end, the electronic device includes a delay line, an oscillator, and a modulator. The delay line generates a spread spectrum clock signal from an input clock signal, where a timing jitter and a period of jitter of the spread spectrum clock signal are controlled at each period of the spread spectrum clock signal based on a digital code. The oscillator uses the spread spectrum clock signal to generate a processing signal. The modulator modulates the processing signal as a function of an audio signal.
Claims15
1-13. (canceled)
A signal processing electronic device configured to reduce electromagnetic noise, the electronic device comprising:
- a delay line configured to generate a spread spectrum clock signal from an input clock signal, a timing jitter and a period jitter of the spread spectrum clock signal being controlled at each period of the spread spectrum clock signal based on a digital code;
- an oscillator configured to use the spread spectrum clock signal to generate a processing signal;
- and
- a modulator configured to modulate the processing signal as a function of an audio signal.
A method of processing a signal to reduce electromagnetic noise, the method comprising:
- generating a spread spectrum clock signal from an input clock signal, a timing jitter and a period jitter of the spread spectrum clock signal being controlled at each period of the spread spectrum clock signal based on a digital code;
- using the spread spectrum clock signal to generate a processing signal;
- and
- modulating the processing signal as a function of an audio signal.
The method according to claim 10, wherein the predetermined distribution curves comprise sine waves.
A computer program product stored in a non-transitory computer readable medium for controlling a data-processing unit, the computer program product comprising software instructions which, when run on the data-processing unit cause the data processing unit to:
- generate a spread spectrum clock signal from an input clock signal, a timing jitter and a period jitter of the spread spectrum clock signal being controlled at each period of the spread spectrum clock signal based on a digital code;
- use the spread spectrum clock signal to generate a processing signal;
- and
- modulate the processing signal as a function of an audio signal.
Dependencies are inferred from the claim text.