Singmai Electronics SM02 Скачать руководство пользователя страница 30 | Manualshive

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Figure 20 Matrix test signal.

Zone Plate

The  zone  plate  is  a  two-dimensional  linear  frequency  sweep  with  the
highest  frequencies  at the  edges  of  the  image. It  can  be  used  to measure
the  horizontal  and  vertical  frequency  response  of  system.  Attenuation  on
the  left  and  right  edges  of  the  image  show  low  pass  filtering  of  the  image;
attenuation  of  the  top  and  bottom  of  the  image  show  vertical  filtering,
perhaps line to line averaging or issues with a scaler or de-interlacer.
The zone plate is very useful for designing and testing composite analogue
video decoders, including the new HD composite standards (see Figure 7).

The zone plate’s use is not just restricted to analogue video decoding. Any
video processing, SD or HD, which manipulates the image spatially and/or
temporally  can  be  tested  to  breaking  point  with  the  zone  plate:  such
processing includes video standards conversion, de-interlacing and scaling.

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Содержание SM02

Страница 1: ...1 SM02 High Definition Video Encoder and Pattern Generator User Manual Revision 0 1 15 th March 2015 ...

Страница 2: ...Multiburst 26 15MHzSw 27 30MHzSw 27 Black 28 White 28 50 Grey 29 Red 29 Green 29 Blue 29 Xhatch 29 SDI PLL 29 Matrix 29 Zone Plate 30 5 SM02 Noise generator 32 6 aCVi Data transfer protocol 33 Appendix A Power supply specification 36 Tables Table 1 aCVi output specification 9 Table 2 Analogue Component output Specifications 10 Table 3 HD SDI Output Specifications 10 Table 4 HD SDI Input specificat...

Страница 3: ...orm 23 Figure 11 SMPTE Reverse colour bars waveform 23 Figure 12 SMPTE Pluge waveform 24 Figure 13 Limit ramp waveform 24 Figure 14 10 step waveform 25 Figure 15 2T30T pulse waveform 26 Figure 16 Multiburst waveform 26 Figure 17 15MHz frequency sweep waveform 27 Figure 18 30MHz sweep waveform 28 Figure 19 30MHz sweep markers 28 Figure 20 Matrix test signal 30 Figure 21 Left side The zone plate sho...

Страница 4: ...flat fields 2T 30T and Pulse bar Multiburst 15 7 5MHz and 30 15MHz luma chroma frequency sweeps 5 step linearity Crosshatch 5 pattern matrix pattern Pathological HD SDI test Circular Zone Plate In addition programmable amplitude white noise and or 50Hz or 60Hz hum may be added to the YPbPr Y channel and aCVi outputs As a video encoder SM02 accepts SMPTE 272M inputs at any of the above standards wh...

Страница 5: ...mplitude aCVi Black level YPbPr Luma amplitude YPbPr Pb Pr amplitude YPbPr Sync amplitude YPbPr Black level SM02 is powered by a universal input power supply and controlled with a simple and intuitive selection menu ...

Страница 6: ...reen blue as the colour difference signals because of the visual perception of the eye being less acute to colour can be sent at half or less of the luma bandwidth for aCVi the chroma bandwidth is 7 5MHz effectively aCVi is 4 1 1 transmission To further reduce the bandwidth of the transmission the colour difference signals are modulated onto a carrier in quadrature so they effectively use the same...

Страница 7: ...power 5V drivers to be used Figure 1 aCVi Spectrum ACVi also allows for the bidirectional transfer of data between receiver and transmitter One byte of data is transmitted in each direction per frame i e 50bytes second data rate for a 50Hz frame rate The data rate is deliberately kept low to reduce the effects of cable attenuation Data is sent using two dedicated lines in the vertical blanking int...

Страница 8: ...put is protected against reverse polarity and is fused against internal short circuits or overloads The converter supplied with the SM02 is a model MW173KB manufactured by SL Power Electronics Corp and provides 9VDC at 3A and accepts AC inputs from 100 240VAC Connect the supplied power cord to the AC DC converter and output DC of the converter to the 9VDC Power In input of the SM02 ...

Страница 9: ...nnected to the BNC aCVi Out The specification for the output is shown in Table 1 Parameter Specification Comments Connector Type BNC Output impedance 75Ω Output return loss 30dB 0 37 125MHz aCVi output level 1 5V pk pk Nominal peak Y to sync tip for 100 colour bars input Table 1 aCVi output specification The analogue component outputs are connected to the BNCs Y Out Pb Out and Pr Out The specifica...

Страница 10: ... SMPTE 272M specification Parameter Specification Comments Connector Type BNC Output impedance 75Ω Fixed termination Output return loss 15dB 50Hz 1 485GHz Output level 800mV pk pk 10 Jitter 0 2UI Table 3 HD SDI Output Specifications The serial digital interface HD SDI input only used in encoder mode is connected to the HD SDI In BNC and its specifications are shown in Table 4 The HD SDI input conf...

Страница 11: ...right hand control Adjust switches the unit between On and Standby by pushing it whilst also adjusting the value of parameters by rotating the knob left or right The central switch Select selects the chosen menu parameter and switches preset parameters between for example on and off After the welcome message is displayed the LCD display will show the available top level menus A left hand arrow ind...

Страница 12: ...djust control Once you have chosen the setting you require press the Select button to return to the menu choices The Adjust control is also used to set the parameter values Once set the required value press the Select button to retain that value and return to the menu To return to the top level menu scroll down the menu choices using the Adjust control the last one before the up arrow will show Ex...

Страница 13: ...13 Menu control The complete menu structure is shown in Figure 4 Figure 5 SM02 Menu structure ...

Страница 14: ... 25Hz output standard for the HD SDI YPbPr and aCVi outputs Note a number of items of video equipment do accept this output standard 720p 30 Forces 720p 30Hz output standard for the HD SDI YPbPr and aCVi outputs Note a number of items of video equipment do accept this output standard 720p 50 Forces 720p 50Hz output standard for the HD SDI YPbPr and aCVi outputs 720p 59 Forces 720p 59 94Hz output s...

Страница 15: ... 1080i 59 94Hz output standard for the HD SDI YPbPr and aCVi outputs Pixel clock frequency is 74 74 17582418MHz 2 1 interlaced output frame rate 29 97Hz 1080i 60 Forces 1080i 60Hz output standard for the HD SDI YPbPr and aCVi outputs 2 1 interlaced output frame rate 30Hz Exit Returns to the top level menus The specifications for the standards are shown in Appendix A Pattern Selects the output patt...

Страница 16: ...ve invalid outputs and may result in clipping of the signal aCVi Adjusts the output amplitude of the composite aCVi video output Default value is 100 gain of 1 Range is 0 130 aCVi Y Adjusts the output amplitude of the luma component of the aCVi video output Default value is 100 gain of 1 Range is 0 130 ...

Страница 17: ...itude of the luma Y channel of the component YPbPr analogue video output Default value is 100 gain of 1 Range is 0 130 YPbPr U Adjusts the output amplitude of the Pb of the component YPbPr analogue video output Default value is 100 gain of 1 Range is 0 130 YPbPr V Adjusts the output amplitude of the Pr of the component YPbPr analogue video output Default value is 100 gain of 1 Range is 0 130 YPbPr...

Страница 18: ...plitude of hum injected into the Y output channel of the YPbPr analogue output and the aCVi video output The range of the control is from 0 off default value to 100 maximum hum A fuller description of the noise generator may be found in Chapter 5 Hum60Hz Hum50Hz Selects frequency of the hum 50Hz or 60Hz Exit Returns to the top level menus Setup B light Controls the brightness of the front panel LC...

Страница 19: ...ue is between 0 minimum and 255 maximum The degree of pre emphasis set is dependent on the cable length and is designed to approximately compensate for the high frequency loss of 300m of RG 59 or UTP cable Figures 6 and 7 show the aCVi output with a 30MHz frequency sweep with minimum and maximum pre emphasis set Figure 6 aCVi output 30MHz sweep Pre emphasis minimum ...

Страница 20: ...20 Figure 7 aCVi output 30MHz sweep Pre emphasis maximum Exit Returns to the top level menus ...

Страница 21: ...lour bars with a 100 white bar reference The colour bar sequence is white yellow cyan green magenta red blue and black Figure 8 75 Component colour bar waveform 100 Colour bars 100 colour bars are used for measuring insertion gain chroma level and chroma gain and for monitor alignment The SM02 generates full frame 100 saturated colour bars with a 100 white bar reference The colour bar sequence is ...

Страница 22: ...lour bars white yellow cyan green magenta red and blue Below this and comprising 8 of the frame is a sequence of blue black magenta black cyan black white bars The bars are used to set the monitor colour saturation and contrast Below this is a below black pluge which is used to set the monitor black level ...

Страница 23: ...23 Figure 10 SMPTE Colour Bar component waveform Figure 11 SMPTE Reverse colour bars waveform ...

Страница 24: ...24 Figure 12 SMPTE Pluge waveform Ramp This waveform is a linear modulated ramp and may be used to measure linearity or signal to noise ratio Figure 13 Limit ramp waveform ...

Страница 25: ...p waveform 2T30T This waveform is a pulse bar waveform consisting of a 2T wide pulse a 12 5T wide pulse a 30T wide pulse and a white bar This test signal is used to measure the pulse response of the video path where ringing of pulses or asymmetry indicate possible problems 2T is the minimum pulse width permissible in the HD video stream ...

Страница 26: ...eform is used to measure frequency response It consists of a reference amplitude bar and six packets of 5MHz 10MHz 15MHz 20MHz 25MHz and 30MHz for the luma channel and 2 5MHz 5MHz 7 5MHz 10MHz 12 5MHz and 15MHz for the chroma channels Figure 16 Multiburst waveform ...

Страница 27: ...This waveform is a 1MHz to 30MHz frequency sweep for the luma channel and a 0 5MHz to 15MHz frequency sweep for the chroma channels These frequencies are the limits of the SMPTE 296M specification for HD video At the bottom of the waveform are 5 markers which indicate the 5MHz 10MHz 15MHz 20MHz and 25MHz frequencies for luma and the 2 5MHz 5MHz 7 5MHz 10MHz and 12 5MHz frequencies for chroma ...

Страница 28: ...sweep markers Black Black is a full frame 0mV luma only video signal that may be used for noise measurements White White is a full frame 700mV luma only video signal that may be used for noise measurements or for finding AC coupling or clamping issues ...

Страница 29: ...ttern of values Y 198h and C 300h After scrambling this results in either 19 ones followed by one zero or 19 zeros followed by one one This output stresses the equalizer because of its low frequency content The bottom half consists of a repetitive active line pattern of values Y 110h and C 200h This results in an output with 20 zeros followed by 20 ones This bit pattern tests the receiver PLL beca...

Страница 30: ...p and bottom of the image show vertical filtering perhaps line to line averaging or issues with a scaler or de interlacer The zone plate is very useful for designing and testing composite analogue video decoders including the new HD composite standards see Figure 7 The zone plate s use is not just restricted to analogue video decoding Any video processing SD or HD which manipulates the image spati...

Страница 31: ...31 Figure 21 Left side The zone plate shows flickering colours at the subcarrier frequency because of crosstalk between the luma and the chroma Right side No crosstalk issues ...

Страница 32: ...ded to the luma component of the composite output The noise can be added to the entire video signal including the sync and blanking or just to the active video The maximum noise setting adds approximately 50dB of noise to the signal The second noise generator is a programmable frequency 50Hz or 60Hz hum generator Figure 22 shows the hum generator on the aCVi output across a frame of video Figure 2...

Страница 33: ... 60 bytes to be transferred each second for a 60Hz frame rate The format of the data transfer is shown in Figure 23 Figure 23 aCVi Data format The format is the same regardless of the direction of transfer The first 8 bits are the framing byte which is a unique code signifying the beginning of data The receiving device must monitor the pre defined vertical blanking line for this framing byte which...

Страница 34: ...itter Receiver The next three bits must be a 010 sequence to ensure the uniqueness of the framing byte The next 9 bits are the data for that control function This is an 8 bit byte with any value between 0 and 255 The data byte is separated into nibbles each of 4 bits separated by a 0 again to ensure the uniqueness of the framing byte The last two bits are parity bits one for the control word and o...

Страница 35: ...d centrally in the active video period although the exact position is not important The pre defined video lines used for the transfer of data are the same for all standards Data is transmitted between transmitter to receiver on Line 7 and between receiver and transmitter on line 8 ...

Страница 36: ...ication The AC DC converter supplied with the SM02 is a model MW173KB from SL Power Electronics Corporation It accepts all AC inputs from 100 240VAC and provides a 9V 3A DC output for the SM02 The detailed specification is shown below ...

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