Singmai Electronics SM02 Manual de usuario

SM02

High Definition Video Encoder

and

Pattern Generator

User Manual

Revision 0.1

15th March 2015

Contents

Contents........................................................................................................ 2

Tables ........................................................................................................... 2

Figures..........................................................................................................3

1. Introduction........................................................................................... 4

2. aCVi Overview...................................................................................... 6

3. Connecting up the SM02......................................................................8

4. Quick Start Guide...............................................................................11

Switch On and Control............................................................................11

Menu control...........................................................................................13

5. SM02 Patterns....................................................................................21

75% Colour bars..................................................................................... 21

100% Colour bars...................................................................................21

SMPTE Colour bars................................................................................22

Ramp......................................................................................................24

5-step staircase ......................................................................................25

2T30T .....................................................................................................25

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 specification.............................................................10

Table 5 SM02 Patterns...............................................................................16

Table 6 aCVi Control words Transmitter > Receiver ..................................34

Figures

Figure 1 aCVi Spectrum. ...............................................................................7

Figure 2 SM02 rear panel..............................................................................8

Figure 3 SM02 AC-DC converter...................................................................9

Figure 4 SM02 Front panel......................................................................... 11

Figure 5 SM02 Menu structure................................................................... 13

Figure 6 aCVi output, 30MHz sweep (Pre-emphasis = minimum)............. 19

Figure 7 aCVi output, 30MHz sweep (Pre-emphasis = maximum)............ 20

Figure 8 75% Component colour bar waveform......................................... 21

Figure 9 100% Colour bar waveform.......................................................... 22

Figure 10 SMPTE Colour Bar component waveform................................. 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 shows flickering colours at the

subcarrier frequency because of crosstalk between the luma and the

chroma. Right side: No crosstalk issues..................................................... 31

Figure 22 Hum generator............................................................................ 32

Figure 23 aCVi Data format........................................................................ 33

1. Introduction

SM02 is a video encoder and pattern generator supporting high definition

video standards.

As a video pattern generator, SM02 can generate 19 line based patterns

which are output as simultaneous HD-SDI (SMPTE-272M), YPbPr

component and aCVi.

Standards supported are:

720p/25Hz-30Hz-50Hz-59.94Hz-60Hz

1080p/24Hz-25Hz-29.97Hz-30Hz

1080i/50Hz-59.94Hz-60Hz

Patterns available include:

75%/100%/SMPTE colour bars

Black/White/50% Grey/Red/Green/Blue 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 which it encodes to simultaneous HD-SDI (SMPTE-272M),

YPbPr component and aCVi outputs. Again noise and/or hum may be

added to the YPbPr and aCVi outputs.

Controls provided include:

aCVi amplitude

aCVi Luma amplitude

aCVi Chroma amplitude

aCVi Burst amplitude

aCVi Sync amplitude

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.

2. aCVi Overview

The following is a brief overview of the aCVi interface.

The basic concept of the aCVi interface is to build on the proven and

reliable transport method of NTSC, (the advantages of PAL –v.v. multi-path

reception –is not relevant to a cable system so NTSC is used as the

model). NTSC transmissions are capable of transmitting more than 1km

across RG-59 cable but the bandwidth is limited to 5MHz. NTSC also has

chroma/luma crosstalk issues that are difficult to resolve at the receiver

end.

Because the cable system is a closed system, it is only necessary for the

transmitter and receiver to ‘understand’ each other so we can modify the

basic NTSC method to suit HD transmissions.

The first thing to overcome is the bandwidth restrictions of the cable. HD

video transmission requires a luma bandwidth of 30MHz according to the

SMPTE-296M specification. Because we have only a single coaxial cable

for the transport we have chosen to transmit luma and colour difference

signals (as opposed to component red, green 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 bandwidth. However, to minimise the signal recovery problems of

NTSC, (and as we have no backward compatibility issues), the lower

sideband of the chroma and the luma high frequencies overlap minimally;

the chroma subcarrier for aCVi is set to ~41.4MHz. (See Figure 1).

For 300m of RG-59 cable we can expect 18dB loss at this frequency

(6.2dB/100m @ 50MHz). However the synchronizing signals are at a much

lower frequency where the loss is only about 1-2dB so reliable rastering of

the received signal should always be assured.

To simplify the high frequency compensation of the transmission, pre-

emphasis is used. The degree of pre-emphasis is programmable to allow

for different cable lengths. The maximum pre-emphasis is set at 30dB and

the frequency response of the pre-emphasis is set to approximate the cable

characteristics.

A further improvement in the SNR is achieved through transmitting a peak

to peak video level of 1.5V which maintains compatibility with any legacy

SD equipment on the network and also allows common low-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 interval.

3. Connecting up the SM02

All connections to the SM02 are made via the rear panel: see Figure 2.

Figure 2 SM02 rear panel.

The AC-DC converter connects to the left hand jack. The SM02 input 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.

Figure 3 SM02 AC-DC converter

A full specification for the supplied AC-DC converter may be found in

Appendix A.

The SM02 provides both analogue and digital component outputs for

connecting to the equipment under test.

The aCVi output is connected 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 specification for the outputs is shown in Table 2.

Parameter

Specification

Comments

Connector Type

BNC

Output impedance

75Ω

Output return loss

>30dB

0-5MHz

Y output level

1.0V pk.pk

Nominal 100% colour bars

input

Cb/Cr output levels

±350mV pk-pk

Nominal 100% colour bars

input

Table 2 Analogue Component output Specifications

The serial digital interface (HD-SDI) output is connected to the ‘HD SDI Out’

BNC and its specifications are shown in Table 3.

The HD-SDI output conforms to the 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

The HD-SDI input conforms to the SMPTE-272M specification.

Parameter

Specification

Comments

Connector Type

BNC

Input impedance

75Ω

Fixed termination

Input return loss

>15dB

50Hz-1.485GHz

Input level

800mV pk-pk

Nominal

Table 4 HD-SDI Input specification.

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