XONYCS COLOUR TV RECEIVER RC4020PS YEAR 1993.

The XONYCS  COLOUR TV RECEIVER RC4020PS  is a 20 inches (48cm) color television with 90 programs and VST tuning search system.

The set is full Multistandard (PAL - SECAM - NTSC) Multisystem  via AV SCART socket, and features an interesting CTI (color transient Improvement)CTI Picture Improvements circuitry in which colour signal, e.g. the line-sequential colour difference signals (R-Y,B-Y), is processed by an edge steepening circuit e.g. a colour transient improver and/or a two-line delay line in which the colour signals from two lines are added. The delay line may be part of a drop-out compensation circuit in which the colour signal of line n is replaced by the signal present for line n-2. A CCD-line may be used as the two-line delay line, and an amplitude limiter included. ADVANTAGE - Increased picture sharpness and improved signal-to-noise ratio capability, tint correction, auto grey scale, bright pictures, full color.
In the past analog commercial TV transmission standards, the limited bandwidth of the transmitted chrominance (or chrominance difference) signals causes the received images to have perceptibly blurred colour transition edges. This is especially evident if the received image contains geometrical patterns, e.g. test-colour bars, and results in the loss of detail detectable in complex multicoloured fine patterns.

In order to improve the quality of the received images, it is necessary to provide the receiver end with circuits capable of restoring, as far as possible, the frequency components in the chrominance signals which have been filtered away by the requirements of the reduced transmission bandwidth: in this way, the temporal duration of the chrominance transition edges, and thus the spatial extent of the chrominance transitions on the TV screen, can be reduced, and the edge definition improved. Circuits of this type are called "Color Transient Improvement" ("CTI") or Chrominance Transition Enhancement circuits.

An important constraint on chrominance transition enhancement circuits is the need to ensure that the center of the chrominance transition is unaffected by the enhancement process, so that the center of the chrominance transition after the enhancement process is still aligned with the center of the associated transition in the luminance signal. Also, it is necessary to leave gradual transitions in time unaltered; preserve, and possibly enhance, fine patterns; prevent the introduction in the image of additional distortions; and ensure that the existing noise components are not accentuated.
The present invention relates to an automatic mode detection for a TV broadcasting system (a broadcast system automatic-discriminating apparatus) which is provided in a multiple-system television receiver, automatically discriminates the television signals (TV signals) of different broadcast systems, and performs reception.
A multiple-system television receiver, so as to deal with the different TV broadcast systems, for example, the NTSC broadcast system used in Japan, the PAL broadcast system used in Germany, the South American area, etc., the SECAM broadcast system used in France, etc. must discriminate the broadcast system by a certain means and operate the video receiver differently in accordance with each broadcast system.
Particularly in an area where TV signals of a plurality of broadcast systems can be received, in order to enable the viewer to watch the TV program without having to be concerned with the broadcast system, it is necessary to provide a broadcast system automatic-discriminating apparatus in which the broadcast system can be automatically discriminated on the TV receiver side, automatically discriminate the TV signals of the respective broadcast systems, and perform signal processing with respect to the TV signals by the methods in accordance with them.
In general, this type of broadcast system automatic-discriminating apparatus performs the automatic discrimination of the broadcast system according to the difference of the frequencies of the color sub-carrier waves (SC) provided for transferring the information of color in the TV signals of the respective broadcast systems.

A SCART Connector (which stands for Syndicat des Constructeurs d'Appareils Radiorécepteurs et Téléviseurs) is a standard for connecting audio-visual equipment together. The official standard for SCART is CENELEC document number EN 50049-1. SCART is also known as Péritel (especially in France) and Euroconnector but the name SCART will be used exclusively herein. The standard defines a 21-pin connector (herein after a SCART connector) for carrying analog television signals. Various pieces of equipment may be connected by cables having a plug fitting the SCART connectors. Television apparatuses commonly include one or more SCART connectors.

Although a SCART connector is bidirectional, the present invention is concerned with the use of a SCART connector as an input connector for receiving signals into a television apparatus. A SCART connector can receive input television signals either in an RGB format in which the red, green and blue signals are received on Pins 15, 11 and 7, respectively, or alternatively in an S-Video format in which the luminance (Y) and chroma (C) signals are received on Pins 20 and 15. As a result of the common usage of Pin 15 in accordance with the SCART standard, a SCART connector cannot receive input television signals in an RGB format and in an S-Video format at the same time.

Consequently many commercially available television apparatuses include a separate SCART connectors each dedicated to receive input television signals in one of an RGB format and an S-Video format. This limits the functionality of the SCART connectors. In practical terms, the number of SCART connectors which can be provided on a television apparatus is limited by cost and space considerations. However, different users wish the input a wide range of different combinations of formats of television signals, depending on the equipment they personally own and use. However, the provision of SCART connectors dedicated to input television signals in one of an RGB format and an S-Video format limits the overall connectivity of the television apparatus. Furthermore, for many users the different RGB format and S-Video format are confusing. Some users may not understand or may mistake the format of a television signal being supplied on a given cable from a given piece of equipment. This can result in the supply of input television signals of an inappropriate format for the SCART connector concerned.

This kind of connector is todays obsoleted !

It has a basic OSD (PHILIPS VST uC). with voltage synthesis tuning system with digital memory, in particular for a television transmissions receiver, wherein a plurality of digital codes, each respectively identifying a television channel, are memorised in a digital tuning memory, to a corresponding plurality of addresses, with an automatic tuning circuit, and with means for modifying the respective digital code, in the presence of frequency drift phenomenons, exceeding the pull-in range of such automatic tuning circuit; the main characteristic of the invention consists in that the system searches the television station modifying the digital tuning code and simultaneously verifying the presence of a station identification signal; and that the exact tuning is obtained verifying a high slope signal coming from the automatic tuning circuit.
Generally, a tuner includes a tuning circuit, a mixer and an oscillator. The tuning circuit is tuned to a radio frequency signal of a bandwidth which is selected by a user among a plurality of broadcasting signals which are received via an antenna, and outputs the tuned radio frequency signal to the mixer. The oscillator generates a continuous wave which is equivalent to the radio frequency signal which is tuned by the tuning circuit. The mixer mixes the tuned radio frequency signal from the tuning circuit with the continuous wave signal from the oscillator, and outputs an intermediate frequency signal. Most of the tuning circuits have a function of varying a tuning frequency by using a varactor diode in order to be tuned to a specific bandwidth of the radio frequency signal.
In the tuning circuit which includes the varactor diode, the tuning frequency is tuned by applying a tuning voltage which is equivalent to a specific frequency to the varactor diode. The tuning voltage which is applied to the tuning circuit is discretely distributed on the basis of assigned channels. Thus, in order to change the tuning frequency of the tuning circuit, i.e., the channel of the tuner, the tuning circuit can be tuned to each of the channel frequencies by discretely providing the tuning voltage to both terminals of the varactor diode of the tuning circuit.
On screen display (OSD) arrangements employed in video processing systems include a switching (or "multiplexing") network for switching between graphic image representative signals and normal video signals so that a graphic image can be displayed on the screen of a picture reproduction device either in place of the image represented by the video signals or together with (inserted in) the image. The graphic image can take the form of alphanumeric symbols or-pictorial graphics, and can be used to indicate status information, such as channel numbers or time, or operating instructions.

In an OSD arrangement for use in an analog video signal processing system, the multiplexing network typically operates to switch in levels corresponding to the desired intensity of respective portions of the graphic image at the time the graphic image portions are to be displayed. In such an arrangement the graphic image representative signals take the form of timing pulses which occur when the graphic image portions are to be displayed and are used to control the multiplexing network. Such an analog OSD arrangement can also be used in a digital video processing system, but requires that the video signals be first converted to analog form. While digital video signal processing systems typically include a digital-to-analog converter section in which the digital video signals are converted to analog form, it may be more cost effective for the OSD arrangement to be incorporated as an integral part of the digital video processing section.
Front commands are present replacing almost all remote control functions.

The XONYCS  COLOUR TV RECEIVER 20"  is fabricated by a chinese factory RECOR (Defunct) and was sold at fair low price in supermarkets for a low batch number of sets for a brief period of time (Price offer). Therefore  the set is almost unknown by brand name and model and almost extint.

The set is internally looking like almost a chinese pocket radio but all semiconductors technology is completely based on PHILIPS Chipset. (it can be easy controlled by any PHILIPS RC5 remote).

In 1993 European & Japan TV fabricants were concentrated to feature the best set with top multiple types of features even in relatively small sets.

This here today is an example of cheap set with interesting features in a very low cheap market sector.

And even if it was an irrelevant  set it has really cracking pictures ways more better than any modern LCD crap lying around.

The critical part was the Line deflection output which was frequently faulty toghether with PSU (which have had the habit to rise up the supply  voltages), and with some resistors sometime going crazy around the chassis, anyway  many of them were running 10 or even 12 Hours a day without any issue for 10 15 years until the owners scrapped them.

(I noticed that some ex owners of  this tellye are still remembering it  todays by model and brand name )

The set features a SAMSUNG CRT TUBE.

From what I know, both brand name (XONYCS) and manufacturer (RECOR) are long Defunct !