Reducing noise during a gain change
First Claim
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1. An apparatus comprising:
- a front end amplifier to adjust a level of an incoming radio signal;
an analog-to-digital converter (ADC) coupled to the front end amplifier to digitize the incoming radio signal and provide the digitized incoming radio signal to a signal path; and
a gain compensation input coupled to the signal path to provide a gain change compensation signal to remove a level change present in the incoming radio signal after a change to a control value for the front end amplifier.
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Abstract
In one embodiment, the present invention includes a method for injecting a gain compensation value into a signal path of a receiver for a predetermined time when a change to a control value for an amplifier of the receiver occurs. This gain compensation value may be used to at least substantially remove a gain change caused by the change to the control value, improving audio performance by reducing or removing audible artifacts caused by the gain change.
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Citations
26 Claims
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1. An apparatus comprising:
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a front end amplifier to adjust a level of an incoming radio signal; an analog-to-digital converter (ADC) coupled to the front end amplifier to digitize the incoming radio signal and provide the digitized incoming radio signal to a signal path; and a gain compensation input coupled to the signal path to provide a gain change compensation signal to remove a level change present in the incoming radio signal after a change to a control value for the front end amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
injecting a gain compensation value into a signal path of a receiver for a predetermined time when a change to a control value for an analog amplifier occurs, the gain compensation value to at least substantially remove a gain change caused by the change to the control value. - View Dependent Claims (12, 13, 14, 15)
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16. An integrated circuit comprising:
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a first amplifier to receive a radio frequency (RF) signal, the first amplifier controlled by a first control value; a digitizer to digitize an output of the first amplifier; a gain compensation circuit to generate a compensation value having an inversely proportional relationship to a change to the first control value; and a combiner to combine the outputs of the digitizer and the compensation value. - View Dependent Claims (17, 18, 19, 20)
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21. A system comprising:
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a receiver to receive an amplitude modulated (AM) signal, the receiver including; a first amplifier to amplify the AM signal, the first amplifier controlled by a first control value; a mixer to downconvert the AM signal to a second frequency signal; a digitizer to digitize the second frequency signal; a gain compensator to generate a compensation value based on a change to the first control value; a combiner to combine the outputs of the digitizer and the gain compensator; and an automatic volume controller (AVC) to receive the combiner output and provide an output signal at a substantially constant volume; and an output device to output the output signal. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification