Abstract: 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.

Abstract: 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).

Abstract: In order to suppress interference signals from adjacent TV channels, an intermediate frequency signal is demodulated with a signal (S(fBT; 0°)) at a video carrier frequency into an in-phase signal, and with a signal (S(fBT; 90°)) shifted in phase by a phase angle ?/2 relative to the signal (S(fBT; 0°)) 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.

Abstract: A frequency converter for converting an intermediate-frequency television signal (s2) to a low frequency by means of a mixer (4) which is fed at its radio-frequency signal input (4.1) with the intermediate-frequency television signal (s2) via an intermediate-frequency filter (3) and at its local-oscillator-signal input (4.2) with a local-oscillator signal (u), the frequency of the local-oscillator signal (u) lying in the range of an adjacent picture carrier (NBT) which is defined by the channel spacing (k0; k0*) and the respective television standard, and which after the frequency conversion is suppressed as a converted adjacent picture carrier (NBT*), or at least attenuated to a negligible residual amplitude, by means of a high-pass selectivity skirt (HP) of a filter device (5).

Abstract: A three-dimensional sound system includes a wireless audio signal transmission method for transmitting audio signals between a transmitting device and a spatially adjacent receiving device associated with an audio signal reproduction device such as a speaker. The audio signals may be digitized in the transmitting device, compressed, and transmitted by a digital high-frequency transmission method as data packets. Symbols may be assigned to the individual data in a quadrature signal plane. A diversity operation takes place between the transmitting device and the receiving device, where the transmitting device has two high-frequency transmitters with quadrature conversion which are each connected to an associated transmission antenna. On the receiver side, each audio signal reproduction device has a receiving device with one receiving antenna and one high-frequency receiver.

Abstract: The invention relates to a circuit for channel filtering of an analog or digitally modulated TV signal (125), comprising a video signal (125b), a sound signal (125a), and a video carrier signal (BT) having a video carrier frequency (fBT) at which the TV signal (125) is converted to an intermediate frequency (2nd IF) generating an intermediate frequency signal (SIF). In order to suppress interference signals from adjacent TV channels, according to the invention the intermediate frequency signal (SIF) is demodulated with a signal (S(fBT; 0°)) at a video carrier frequency (fBT) into an in-phase signal (I), and with a signal (S(fBT; 90°)) shifted in phase by a phase angle ?/2 relative to the signal (S(fBT; 0°)) and at a video carrier frequency (fBT) into a quadrature signal (Q), for example, by an I/Q demodulator (3).

Abstract: 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).

Abstract: 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.

Abstract: A circuit configuration for intermediate frequency demodulation for a video signal processing device includes an intermediate frequency filter to which an input signal converted to an intermediate frequency is delivered, and a mixer for demodulation with a simulated video carrier. In a further branch, the video carrier is eliminated from the input signal by a bandpass and converted in an oscillator into reference signals being mutually phase offset by 90.degree.. A phase tracker ensures that the phase and frequency of the simulated video carrier are correct relative to the signal to be demodulated. The phase tracker contains in each of two branches a mixer and a low pass, through which a component separation of the video signal to be demodulated is carried out. The reference signals are weighted in further mixers with determined equisignal components and combined into the simulated video carrier.