Trident Microsystems (far East) Ltd.

Micronas Gmbh

Hans Fiesel

Miodrag Temerinac

Ingo Steinbach

Chiron Van Der Burgt

An analog signal is sampled to provide a digitized signal and the resultant digitized signal is output to a delay element, which provides a delayed digital signal. The analog signal is also input to an analog noise detector, which provides a noise detector output signal to a digital logic unit. The digital logic unit processes the noise detector output signal to determine if noise is present in the analog signal, and provides a control signal. An amplifier receives the delayed digital signal and reduces a gain applied to the delayed digital signal in response to the control signal, and provides an amplifier output signal.

Device and method for noise suppression

The invention relates to a method as well as a circuit arrangement for suppression of a perturbing quadrature component of a carrier signal of an amplitude-modulated signal during the recovery of the carrier signal in a synchronous demodulator, which outputs a quadrature signal (Q). The perturbing quadrature component of the carrier signal is estimated and the estimated quadrature component is subtracted from the quadrature signal (Q).

Method and circuit arrangement for suppressing an orthogonal perturbation

In order to suppress interference signals from adjacent TV channels, an intermediate frequency signal is demodulated with a signal (S(f; 0&#xb0;)) at a video carrier frequency into an in-phase signal, and with a signal (S(f; 90&#xb0;)) shifted in phase by a phase angle &#x3c0;/relative to the signal (S(f; 0&#xb0;)) and at a video carrier frequency into a quadrature signal, for example, by an I/Q demodulator. The in-phase signal is filtered by a first Hilbert filter of a Hilbert filter pair having an even symmetrical impulse response in order to obtain a Hilbert-filtered in-phase signal. The quadrature signal is filtered by a second Hilbert filter of the Hubert filter pair having an uneven symmetrical impulse response in order to obtain a Hilbert-filtered quadrature signal. The Hilbert-filtered quadrature signal is added, for example, by an adder to the Hilbert-filtered in-phase signal in order to obtain a video output signal.

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Gundelfingen, Germany

Hans Fiesel