Noise reduction within an electronic device using automatic frequency modulation
First Claim
1. An electronic device comprising:
- an oscillator module configured to generate an oscillating signal of a frequency based on a tuning value input at a tuning input of the oscillator module;
a result signal generator configured to provide a result signal which is at least partially based on the oscillating signala controller connected to the tuning input of the oscillator module and the result signal generator and configured toapply a plurality of different tuning values to the tuning input of the oscillator module,for each applied tuning value, determine a respective noise value, the noise value being indicative of a level of noise which appears at the result signal while the applied tuning value is being applied,select one or more low noise tuning values of the plurality of different tuning values, the low noise tuning values being associated with low respective noise values, andapply a low noise tuning value of the one or more low noise tuning values to the tuning input of the oscillating circuit.
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Accused Products
Abstract
Disclosed is a system and method for providing an oscillating signal of relatively precise frequency without using a signal provided by a crystal as a reference. Disclosed is a feedback oscillator circuit configured to output an oscillating signal having a frequency defined by a reference signal. The oscillating signal can be sent to one or more circuits including at least one frequency sensitive element. The frequency sensitive element produces an output signal which depends on the frequency of the oscillating signal. A controller controls the reference signal in order to cause an attribute of the output signal to have a value within a desired range.
190 Citations
39 Claims
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1. An electronic device comprising:
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an oscillator module configured to generate an oscillating signal of a frequency based on a tuning value input at a tuning input of the oscillator module; a result signal generator configured to provide a result signal which is at least partially based on the oscillating signal a controller connected to the tuning input of the oscillator module and the result signal generator and configured to apply a plurality of different tuning values to the tuning input of the oscillator module, for each applied tuning value, determine a respective noise value, the noise value being indicative of a level of noise which appears at the result signal while the applied tuning value is being applied, select one or more low noise tuning values of the plurality of different tuning values, the low noise tuning values being associated with low respective noise values, and apply a low noise tuning value of the one or more low noise tuning values to the tuning input of the oscillating circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for generating an oscillating signal in an electronic device the method comprising:
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applying a plurality of different tuning values to an oscillator module; generating by the oscillator module an oscillating signal whose frequency is based on a currently applied tuning value; providing a result signal at least partially based on the oscillating signal; for each applied tuning value, determining a respective noise value, the noise value being indicative of a level of noise which appears at the result signal while the applied tuning value is being applied; selecting one or more low noise tuning values of the plurality of different tuning values, the low noise tuning values being associated with low respective noise values; and applying a low noise tuning value of the one or more low noise tuning values to the tuning input of the oscillating circuit. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A digital audio player comprising:
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an oscillator module configured to generate an oscillating signal of a frequency based on a tuning value input at a tuning input of the oscillator module; a result signal generator configured to provide a result signal which is at least partially based on the oscillating signal a controller connected to the tuning input of the oscillator module and the result signal generator and configured to apply a plurality of different tuning values to the tuning input of the oscillator module; for each applied tuning value, determine a respective noise value, the noise value being indicative of a level of noise which appears at the result signal while the applied tuning value is being applied, select one or more low noise tuning values of the plurality of different tuning values, the low noise tuning values being associated with low respective noise values, and apply a low noise tuning value of the one or more low noise tuning values to the tuning input of the oscillating circuit.
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35. A mobile telephone comprising:
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an oscillator module configured to generate an oscillating signal of a frequency based on a tuning value input at a tuning input of the oscillator module; a result signal generator configured to provide a result signal which is at least partially based on the oscillating signal a controller connected to the tuning input of the oscillator module and the result signal generator and configured to apply a plurality of different tuning values to the tuning input of the oscillator module, for each applied tuning value, determine a respective noise value, the noise value being indicative of a level of noise which appears at the result signal while the applied tuning value is being applied, select one or more low noise tuning values of the plurality of different tuning values, the low noise tuning values being associated with low respective noise values, and apply a low noise tuning value of the one or more low noise tuning values to the tuning input of the oscillating circuit.
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36. An electronic device including a first module and a second module, the first module including a first clock generator for generating a first clock signal for the first module, the second module including a second clock generator for generating a second clock signal for the second module, the first clock generator including a crystal oscillator on which the frequency of the first clock signal is based, the second clock generator being free of any crystal oscillators, wherein:
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the first module is configured to generate a first output signal at frequency based on the frequency of the first clock signal; and the second module is configured to generate a second output signal at frequency based on the second clock signal, send the second output signal through a traversal circuit, sense any noise that has appeared at the second output signal as result of sending the second output signal through the traversal circuit, said noise being at least partially dependent on the first output signal, and control the frequency of the second clock signal based on the sensed noise. - View Dependent Claims (37, 38, 39)
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Specification