Granted Patent B2

US 8,078,129 · App. 12/391,020 · Granted Dec 13, 2011

Abstract

Claims (16)

1. A method for adjusting the bandwidth of a receiver, comprising:

determining whether a signal to noise ratio for a signal output by the receiver is within a desired operating range;

when it is determined that the signal to noise ratio is not within a desired operating range, determining whether adjacent channel interference is present in the signal;

narrowing the bandwidth of the receiver when it is determined that adjacent channel interference is present;

when it is determined that adjacent channel interference is not present, determining whether there is group delay distortion; and

increasing the bandwidth of the receiver when it is determined that the group delay distortion is present.

2. The method of claim 1 , further comprising determining a mode of operation and adjusting the bandwidth of the receiver based on the determined mode of operation.

3. A tuner including a receiver and a processor coupled with the receiver, the receiver comprising:

an image rejection block, the processor configured to:

determine whether a signal to noise ratio for a signal output by the receiver is within a desired operating range;

when it is determined that the signal to noise ratio is not within a desired operating range, determine whether adjacent channel interference is present in the signal;

control the image rejection block so as to narrow the bandwidth of the receiver when it is determined that adjacent channel interference is present;

when it is determined that adjacent channel interference is not present, determine whether there is group delay distortion; and

control the image rejection block so as to increase the bandwidth of the receiver when it is determined that the group delay distortion is present.

4. The tuner of claim 3 , wherein the image rejection block comprises a bandstop filter, a mixer, and a programmable filter and wherein the processor is configured to control the image rejection block by programming the programmable filter.

5. The tuner of claim 4 , wherein the processor is further configured to determine a mode of operation and control the image rejection block in order to adjust the bandwidth of the receiver based on the determined mode of operation.

Assignments (14)