Method and apparatus for implementing automatic gain control in a system
First Claim
1. A method for implementing automatic gain control in a system where an analog signal is converted into a digital signal and where automatic gain control of an adjustable signal is performed in an analog manner using gain control of a predetermined size and where inverse gain control of the digital signal is performed such that the power of the adjustable signal after digital adjustment is the same as before the analog adjustment, the method comprising:
- determining a maximum energy of the adjustable signal during a predetermined measurement period;
comparing the determined maximum energy to at least one preset threshold value; and
initiating an automatic gain control of the analog signal and a compensation for the automatic gain control to the digital signal, if the determined maximum energy exceeds the at least one preset threshold value.
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Accused Products
Abstract
The invention relates to a method and an apparatus for implementing automatic gain control in a system where an analog signal is converted into a digital signal. The apparatus comprises means (208) for performing automatic gain control of the adjustable signal in an analog manner using a gain control step of predetermined size and means (446, 448) for performing inverse gain control of the digitized signal in such a way that, after the digital adjustment, the power of the signal is the same as before the analog adjustment. To enable an accurate gain control, the apparatus further comprises means (410, 412, 214, 420) for determining the maximum energy of the signal during a predetermined measurement period, means (426, 428) for comparing the determined maximum energy to preset threshold values (430, 432), and means (436) for performing an automatic gain control of the analog signal and a compensation for the gain control to the digital signal, if the measured value exceeds the threshold.
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Citations
19 Claims
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1. A method for implementing automatic gain control in a system where an analog signal is converted into a digital signal and where automatic gain control of an adjustable signal is performed in an analog manner using gain control of a predetermined size and where inverse gain control of the digital signal is performed such that the power of the adjustable signal after digital adjustment is the same as before the analog adjustment, the method comprising:
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determining a maximum energy of the adjustable signal during a predetermined measurement period;
comparing the determined maximum energy to at least one preset threshold value; and
initiating an automatic gain control of the analog signal and a compensation for the automatic gain control to the digital signal, if the determined maximum energy exceeds the at least one preset threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for implementing automatic gain control in a system where an analog signal is converted into a digital signal and which system includes means for performing automatic gain control of an adjustable signal in an analog manner using gain control of a predetermined size and means for performing inverse gain control of the digital signal such that the power of the adjustable signal after digital adjustment is the same as before analog adjustment, the apparatus comprising:
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means for determining a maximum energy of the adjustable signal during a predetermined measurement period;
means for comparing the determined maximum energy to at least one preset threshold value; and
means for initiating an automatic gain control of the analog signal and a compensation for the automatic gain control to the digital signal, if the determined maximum energy exceeds the at least one preset threshold value. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus to implement automatic gain control a system where an analog signal is converted into a digital signal, the system including structure to perform automatic gain control of an adjustable signal in an analog manner using gain control of a predetermined size and to perform inverse gain control of the digital signal such that the power of the adjustable signal after digital adjustment is the same as the power of the adjustable signal before analog adjustment, the apparatus comprising:
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a comparator configured to determine a maximum energy of the signal during a predetermined measurement period;
at least one threshold detector configured to detect at least one preset threshold value;
the comparator being configured to compare the determined maximum energy to at least one preset threshold value; and
a control unit configured to initiate an automatic gain control of the analog signal and a compensation for the automatic gain control to the digital signal, if the determined maximum energy exceeds the at least one preset threshold value.
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Specification