Itt Industries, Inc.

Deutsche Itt Industries Gmbh

Hermannus Schat

Herbert Elmis

Laurin C Freyberger

Bernd Novotny

Dietmar Ehrhardt

Otmar Kappeler

Fritz G Adam

Manfred F Ullrich

Ljubomir Micic

Wolfgang Gollinger

Dieter Holzmann

Holger Struthoff

Detlev Kunz

Gerhard G Gassmann

Gerhard Gunter

The frequency conversion of an RF signal is performed by the 'third method' using a suitable frequency reversal which makes the frequencies of the picture carrier, the chrominance subcarrier, and at least one sound carrier appear transformed into the baseband, such that the frequencies of the transformed picture carrier and the transformed chrominance subcarrier coincide. Unavoidable differences in the signal paths of the frequency reversal result in a spurious signal which produces a temporally/locally varying moire on the screen. By means of a frequency offset, this spurious signal is transformed into a frequency range which is not found annoying by the observer, so that the moire becomes invisible. This frequency range is preferably the exact center region between two spectral lines of the horizontal frequency of the composite color signal in the baseband.

Frequency conversion of an RF signal transmitted for color-television

A television sound receiving circuit for at least one sound channel contained in an RF signal converts the transmitted or already down-converted television signal as a composite signal to the baseband in a single-sideband demodulator circuit using the 'phasing method', separates the first sound channel, corresponding to a lower sideband, and the second sound channel, corresponding to an upper sideband, and produces first and second sound signals at the desired frequency by subsequent frequency demodulation. Also shown are the interfaces for possible digitization and an advantageous use of the interfaces in which picture and sound signals are digitized together. The data can be combined into a single data stream which can be transferred over a bus system and is separable into the individual components if required.

Television sound receiving circuit for at least one sound channel

To adjust time delays in equidistant steps, an inverter chain is provided with an even number of static inverters of identical topology. The output of one of the even-numbered inverters is connected to the signal output via a selector switch. During suitable frequency-measuring periods, an odd number of inverters is connected to form a ring by directly coupling the output of an odd-numbered inverter to the input of the first, and a digital measuring arrangement determines the time delay of the ring-connected portion from the frequency of the ring's self-excited oscillation. The output signal of the measuring arrangement is used to adjust the time delay of the inverter chain.

MOSFET Integrated delay circuit for digital signals and its use in

This relates to apparatus for the 'picture on picture' or 'program check' project. Storage, storage control circuits and clock signal generators are disclosed. The storage consists of two parts which are simultaneously fed by selected lines of the second program.

Television receiver equipped for simultaneously showing several programs

The area of an integrated delay line comprising charge transfer circuits (charge-coupled circuits and bucket brigade circuits) is minimized by arranging the stages in such a manner that between two longitudinal chains of stages there lie n/2 transversal chains, n being the number of stages of one longitudinal chain.

Charge transfer delay circuit for analog signals

Several solutions to the problem of making integrable the known so-called tangent correction circuit of TV receivers are provided. The solutions are: a diode-resistor matrix, a voltage-dependent resistor arrangement or a regulating circuit.

Monolithic integrated circuit for the distortion of a saw-tooth signal

This relates to a bucket-brigade delay line wherein clock frequency dependent modulation of the delayed signal is avoided by inserting at least one inverter stage into the delay line. The output of the inverter stage contains the inverted modulation signal. This signal is then added to the line thereby compensating for the unwanted modulation.

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Freiburg, Germany

Hermannus Schat