Description:     Coder COD-506.300 is intended to code four TV channels, it provides the synchronization of several coders, commutation of the input signal, does not contain built-in receiver. To the inputs of the coder a standard composite analog videosignal is transmitted.

Facilities

• CVBS video inputs;
• coding with the digital processing of video signal;
• transcoding SECAM-PAM;
• video channel time delay compensation;
• creeping line insertion;
• test signal mode;
• frame synchronization of the output signal with an external sync pulses generator (this function is fulfilled when there is high-quality input signal with high frequency stability).

Construction

    It is constructively made as a single metal case Multipac. The case is easily assembled into the 19" device box. Case height - 2U (90,45 mm), depth - 295 mm, width -483 mm.
    Аудио/видео входы/выходы скомпонованы на задней панели.

Specification of the coder COD-506.300

Name	Value
Quantity of channels	4
Input videosignal type	CVBS
Color system of the input analog videosignal	PAL, SECAM
Color system of the output videosignal	PAL
Quantity of the created test videosignals	16
The quantity of engaged decoders, not more	48000
The quantity of symbols in a creeping line, not more	5214
Outside syncronization	Full, vertical
Program control interface	RS-232
Renewal of all work modes after power disappearing	Automatic
Quantity of the commutated signal sources for a channel	2
Quantity of channels of every signal source sound accompaniment, not more	2
Commutator control	Control computer, connector "commutator"
Dimensions, mm, not more	483х90х295
Weight, kg, not more	2,3

Description

    A program "Win_Loader", which is distributed together with the Crypton equipment, controls the work of coder and decoders. The program was tested based on the next operating systems: Windows 98, Windows XP, Windows 2000.
    Coders are installed into a loop break between videosignal source and a modulator of the radiosignal of TV image. They are connected to the communication COM computer port. Control over several coders is fulfilled through their direct coupling.
    Every next coder is connected to the previous one. The coders are connected in the following way. To the input of the first coder a feed cable is linked up.
    To the output of the first coder a transfer cable is connected, the second connector of the cable is linked to the input of the next coder up. So, on every next coder the output of the previous one is connected with the input of the next one.
    Studio modulator is connected to one of the two equivalent video outputs.
    For synchronous work of several coders the following procedures of synchronization are used in the system:
        - autonomous work;
        - videosignal synchronization;
        - channel synchronization;
        - full synchronization.
    When working isolated coders are not synchronized, even if input signals are synchronous. In such a case the quartz generator of the coder defines an output videosignal frequency. When working isolated the light diode "Mode" shines yellow.
    To get videosignal synchronization one of the coders is appointed as Master (in such state the light diode shines red), the rest - slave (light diode "Mode" shines green). All coders, in such a case, use quartz generator of the Master or they are fully synchronized by the test videosignal when connecting to the video synchronizing connector, output line and field sync pulses at the output of all coders appear at the same time. To compensate time delay in modulators, different videosignal delays with discreteness 37 nsec may be introduced. In the program this is the window "phase shift in synchronous mode". 37 nsec correspond to one unit. Zero phase shift -127 units.
    In a channel synchronization mode кодеры работают также, как и в режиме синхронизации видеосигнала, а для декодеров дополнительно синхронизируется часть служебной информации, что позволяет сократить время включения декодера при переключении канала и поддерживать разные списки абонентов для разных каналов.
    In a mode of full synchronization a videosignal and additional information for decoders are synchronized. All decoders at all channels receive the same information, which is transmitted by the master coder. Subscriber lists and some other directions in master coders are ignored. This mode is necessary for work of the group decoders in MMDS systems.
    If no one coder is not appointed as " master", than all coders automatically turn to autonomous mode.
    Connectors "Synchronization input/output" are designed for the synchronization of several four-channel coders. At the same time patch-cable is connected from the synchronization output of the first coder to the synchronization input of the second coder and so on for every coder. In such a way, coders synchronization system is connected, that allows to appoint "master" every coder.
    Availability of a high quality commutator of audio- and video- signals allows to use coder as an advertising commutator. When controlling commutator with the help of the program "Win_Loader" the period of switching signal depends on the master computer speed, quality of coders and index number of the coder in a system. For an instant switching of signal sources an outside commutator control input is provided. As an outside control device any device creating TTL-signal on the output can by used.

 Description of the coder COD-506.300 in PDF format in Russian

 Operating manual of the coder COD-506.300 in PDF format in Russian