Test Solution for Digital Video. DAQTron and National Instruments

Transcription

1 Test Solution for Digital Video DAQTron and National Instruments

2 Overview Overview of Testing Broadcast Video DAQTron Digital Video Test Solution Architecture Digital Video Generation (DVG) Software NI RFSG as a Broadcast Solution DAQTron DVG Screen Shots and Demo

3 Broadcast Video Test Example - Tuner RF Input RF signal with modulated video & audio signal PIF Part Demodulate video & audio signal from RF Input Pin Input digital patterns to Change Channel

4 PXI Based Solution DTV RF Signal Audio Test Video Test Digital I/O

5 Source Coding Source Coding Channel Coding Channel Coding Modulation Upconversion Elements of DVB Solution Digital Content Video Audio Text Service MPEG 2 Transport Stream Modulated RF Waveform RF

6 MPEG-2 Transport Stream (TS) 188 byte packets Audio and Video packets are intermingled in the stream Content is spread throughout stream according to receiver buffer requirements as per MPEG Transport Stream System Target Decoder (T-STD) User defined info can be packaged with the stream (program guide, subtitle, etc.) Unused bandwidth is padded with null packets MPEG-2 TS also carries MPEG-4 content

7 MPEG-2 TS Compilation Video Frames Audio Data Elementary Stream Packet Forming Packet Forming Packetized Elementary Stream TS TS TS TS TS TS Video TS Video TS Video TS Audio TS Audio TS Audio TS Sys. TS Sys. TS Sys. TS NULL TS NULL TS NULL TS MUX MPEG-2 TS

8 Digital Video Broadcast (DVB) European standard using MPEG-2 TS MPEG-2 / H.264 Video MPEG-1/2 / AAC / AC-3 Audio 5/6/7/8 MHz Bandwidth Common set of Service Information (SI) Tables Flavors: DVB-T: Terrestrial, COFDM-Based DVB-H: Mobile, COFDM-Based, IP Encapsulated Content, Time-Sliced DVB-C: Cable, 16/32/64/128/256-QAM DVB-S: Satellite, BPSK, QPSK DVB-S2: Satellite (2 nd Generation), QPSK, 8-PSK, 16/32-APSK

9 Integrated Services Digital Broadcast (ISDB) Japanese Standard Published by ARIB using MPEG-2 TS MPEG-2 / H.264 Video AAC Audio 6 MHz Bandwidth Service Information (SI) Tables adapted from DVB with additions Flavors: ISDB-T: Terrestrial and Mobile, COFDM-Based, spectrum divided into 13 segments, Segments can be divided into 3 different layers ISDB-T SB : Audio, a reduced version of ISDB-T that utilizes only 1 or 3 segments (also called 1seg and 3seg )

10 Adv. Television Systems Committee (ATSC) United States digital Television Standard using MPEG-2 TS MPEG-2 / H.264 Video AC-3 Audio 6 MHz Bandwidth Service Information (SI) Tables different from DVB and ISDB Flavors: Terrestrial: 8/16-VSB Cable: Defined in J.83-Annex B, 64/256-QAM Mobile: (Proposed), based on 8/16-VSB

11 DAQTron s DVG Family of Applications DVTG: DAQTron Video Transport Stream Generator DVG: DAQTron Video Generator DVP: DAQTron Video Player Each application comes in both open source LabVIEW VIs as well as custom TestStand step types making it easy to incorporate into existing systems.

12 Transport Stream Generator (DVTG) Creates Transport Streams (TS) for every major DTV standard Accepts audio and video in all popular formats Encodes audio and video to match requirements of standard Utilizes DirectShow technology Adds optional SI information like event descriptions Powerful yet simple graphical user interface

13 Generator (DVG) Accepts any valid existing transport stream Performs channel coding and modulation User interface simplifies the process of configuring physical parameters Optimized algorithms speed up generation Ability to create long playback files for streaming

14 Player (DVP) Configures the RFSG and downloads BIN files Support for 3 Modes: Tone Generation Full Waveform Download Streaming Optional Addition of Impairments Some parameters (Frequency, Power Level, AWGN, etc) can be changed during playback

15 DVG s Standard Support Currently Supported DVB-T DVB-H DVB-C DVB-S DVB-S2 ISDB-T Under Development ATSC (VSB) J.83 Annex B T-DMB

16 Digital Video Test Solution Architecture Audio Video Data DAQTron TS Generator (DVTG) DAQTron BIN Generator (DVG) DAQTron Player w/ Impairments (DVP) NI RFSG Digital Video Signal Steps Involved in Generating video with DVG Create transport stream (TS) containing SI tables specific for the desired standard Apply channel coding and modulation algorithms to create a binary waveform Optionally add impairments like fading and AWGN to waveform Download and play the resulting waveform on the RFSG hardware Complete TestStand API available

17 RF Vector Signal Generation NI PXI GHz RF Vector Signal Generator with Digital Upconversion Measurement Performance 250 khz to 2.7 GHz 20 MHz Real-Time Bandwidth -145 to +10 dbm power level 50 ppb frequency accuracy Flexible Modulation Software ASK, FSK, MSK, GMSK, PSK, QPSK, /4 DQPSK, QAM, AM, FM, PM, Custom Deep Onboard Memory 32, 256, and 512 MB memory options

18 DAQTron DVTG Extract short videos from longer files Use video and audio in many different formats Replace existing audio or add audio to silence movies Use still pictures (JPEG, BMP, etc) to create test patterns

19 DAQTron DVG Direct control over every physical parameter Dedicated screens for each standard Code limits inputs to allow only valid combinations

20 DAQTron DVP Select file to download or stream Adjust power level and center frequency Optional triggering to signal measurement hardware Optional impairment injection

21 Demo DAQtron DVG Software PXI-5671 RF Vector Signal Generator Mobile DVB-T TV