Multi Standard CONVERTERS - DIGITAL TO ANALOG VIDEO

CONVERTERS - DIGITAL TO ANALOGUE VIDEO MDE-1000 Snell & Wilcox Multi-standard standalone Digital encoder.

SDI inputs, analogue video outputs. Еncoder / Decoder

Snell&Wilcox MDE 1000 Multi Standard Encoder

The MDE1000 is a digital encoder designed to encode 10 bit component digital video into any of the worlds major composite standards.

Providing outputs of PAL NTSC SECAM PALM and PALN the encoding process is entirely digital needing no setup or maintenance.

The unit is housed in a compact 1U X 19 inch rack frame, and contains the switched mode power supply, axial blower for cooling and two PCBs (the AOP and IPD) for video processing.

The IPD ’input digital’ PCB performs decoding of the input component digital video signal which can be either parallel or serial format. The system microcomputer is also contained on the PCB together with all user controls. Luminance from the input can be processed by the digital notch filter,and this provides ten levels of non linear attenuation of those signal components located around the output subcarrier frequency which could give rise to annoying cross effects when the output is decoded.

This PCB also has a frame memory giving the unit a delay of one frame with respect to the reference input. The output of the IPD PCB is 10 bits of luminance at 13.5MHz and 10 bits of Cb and Cr at 6.75MHz with timing and preprocessing applied, this signal is passed to the AOP PCB together with video timing information.

The AOP PCB performs the digital encoding function. All functions necessary for encoding to take place are contained on this PCB, including subcarrier generation, chrominance filtering and level transcoding. Blanking and the addition of the composite timing information are also performed on this PCB. The encoded digital output is rounded to 12 bits and converted to an analogue signal using a high speed 12 bit D to A converter. This signal is filtered by a high quality 5.75MHz filter, and buffered to drive up to 5 outputs.

 

INPUTS SIGNALS Parallel component video Via a 25 way D type socket with pin-out in accordance with CCIR Rec 656 The input is terminated with 11 X 100 ohm resistive loads and should be encoded in accordance with CCIR Rec 601, 4:2:2 format. Serial component video An active loop-through input via BNC connectors. The input signal must be connected to the INPUT connector , where it is internally terminated in 75 Ohms, and the output signal taken from the OUTPUT connector. The serial input should be of scrambled format following the polynomial (X9+X4+1)(X+1). This input contains an automatic equaliser allowing input lengths up to 200m when high quality coax is used. Return loss is better then 15dB. Analogue reference Passive loop-through with return loss greater then 35dB. 2 X BNC socket Reference signal is nominally of composite format 1Vpp or black & burst and the unit can operate with variations of +3dB and -3dB about this level. A mono source can also be used as reference but in this mode the unit will line lock rather than the subcarrier lock which is performed when a burst is present. When no reference is present the unit will perform line lock to the F and H data contained in the incoming video data. OUTPUTS SIGNALS Composite video Five isolated outputs 1Vp-p via BNC connectors for 75 ohms and conforms to CCIR report 624-3. Return loss better then 35dB DC to 5.5 MHz. Mixed sync 2Vp-p via BNC connector for 75 ohms Early sync 2Vp-p via BNC connector for 75 ohms Sync Delay TTL signal representing the synchroniser delay time. Signal will go high at the beginning of input field 1, will stay high for the delay time and then go low at the end of the delay time. Maximum delay is 1 frame and increments in steps of 74ns. For use with auto-tracking audio delay units. POWER REQUIREMENTS Voltage Range 88V to 264V AC 1.2A 45Hz to 60Hz IEC320 inlet socket Fused 2.5A(T) Power Consumption 40VA maximum. TEMPERATURE RANGE 0 to 40°C Operating, -30 to +75°storage MECHANICAL The unit is ruggedly constructed in a 19" 1U steel rack mount case Dimensions 483mm X 495mm X 45mm (W,D,H) Weight 10kg

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