Deutsche Thomson-Brandt Gmbh

Deutsch Thompson-Brandt Gmbh

Michael Maier

Eric Benoit

Gangolf Hirtz

Thomas Hollmann

Bernard Hepp

Antoine Dupont

For compatible transmission of a television picture having an aspect ratio of 16:9 within a 4:3 system, transmission is effected in the letterbox format in accordance with the PALplus system specification. The receiver reconstructs the original picture with the aid of vertical filters and is able, furthermore, to suppress crosstalk interference from the luminance signals in the chrominance signals. To further improve the picture quality, the picture is displayed at a frame frequency of 100 Hz. For this purpose, the picture supplied at 50 Hz with line interlacing must be converted to a frame frequency of 100 Hz. Known concepts for PALplus decoding and 100 Hz conversion carry out these processes separately and in doing so require a great deal of memory space. By virtue of the memory control according to the invention, in which a field is stored in different memory areas (M1, M2), successive lines of a field not being stored in successive address areas or only partially being stored in successive address areas, the PALplus decoding and simultaneous 100 Hz conversion are possible with two memory modules. As a result, a decoder with 100 Hz reproduction is possible with reduced costs.

Method and circuit arrangement for the memory-optimized processing of a

For many signal processing arrangements in TV receivers it is necessary to know the type of signal source. A plurality of parameters must be set depending on whether a standard-conforming source and hence a standard signal or a non-standard source (for example VCR) is involved. The circuit according to the invention is capable of making a statement in a TV receiver as to whether or not a source corresponding to the TV standard is present. For this purpose, the locking of the color subcarrier with the horizontal frequency is investigated and two different criteria (FSCFH, CCC) are utilized for the decision. The optimized setting of parameters in the receiver is possible with the aid of the decision made. Furthermore, the circuit provides, in the event of a standard signal, a highly stable sampling clock (fLL1) of the kind necessary, for example, for ColorPlus processing within the PALplus system.

Method and circuit arrangement for distinguishing between standard and

A more accurate voltage-to-time and then time-to-voltage conversion is accomplished by tailoring the amplitude versus time characteristics of the pulses generated in the voltage-to-time conversion. One embodiment includes applying a ramped voltage supply to an amplifier coupled between the voltage/time converter and the time/voltage converter. The ramped supply is arranged to condition the amplitude of a portion of respective pulses to include a slope similar to the ramped voltage applied to the time/voltage converter. This tends to effect a more accurate response in the time/voltage converter.

Method and facility for time/voltage conversion

An actuation circuit for a liquid crystal display includes a plurality of pixel elements constructed in the form of a matrix of columns and rows and a plurality of column capacitors connected to respective columns of the liquid crystal display that can be charged to store a signal to be displayed. The activation circuit comprises a number of blocks which each comprise a separate group of the columns forming the matrix of pixel elements, a corresponding number of column capacitors, and a plurality of data lines. The individual data lines receive respective signals and are connected to the column capacitors. A switch device is connected to each respective block for successively switching between the number of blocks. The signal to be displayed is fed in parallel through the data lines of the columns of a first block to charge respective column capacitors of the first block and after the charging of the column capacitors in the first block, the input lines are switched by the switch device to the data lines of the columns of the next-following block.

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Villingen-Schwenningen, Germany

Michael Maier