Frequency converter

Details Frequency converter Frequency converter

2005-10-25

2005-10-25

Miller, John (Department: 2614)

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

C348S659000, C375S346000

Reexamination Certificate

active

06958782

ABSTRACT:
There is provided a frequency converter for suppressing generation of an image signal using a simple adaptive algorithm. In the frequency converter, an orthogonal converter21converts an RF/IF signal to a complex signal along with frequency conversion and ADCs quantize the complex signal. An image signal canceller achieves the complex conjugate of the quantized complex signal by inverting the imaginary part of the quantized signal through a multiplier. An LMS core adaptively processes the complex signal using the complex conjugate signal as a reference signal and the output of the image signal canceller as an error signal. The resulting cancellation signals are level-matched in attenuators. Subtracters combine the complex signal with the level-adjusted complex conjugate signal.

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