- Test procedure:

Configuring the measured signal:

STB input level: - 60 dBm

Transmission line: The jitter with random amplitude within 50 (s to be added to the PCR field for two images services STB s d dng truyn ti bao gm cc chng trnh vi rung pha PCR l 50 (s.

Tn hiu hnh PAL c theo di trn mn hnh hin th.

Kt qu yu cu:

Ting v hnh ch cm trong khi thu ng h thi gian h thng (STC) (chuyn tip s khng b gy khc v lin mch khi khch hng chuyn knh). B gim m s c kh nng:

- Phc hi STC s dng PCR vi rung pha cc i 50 (s.

- Bm d bin i di hn ca tn s STC trong b m ha.

Vi mi dch v, thit b gii ghp knh s phc hi ng h ngun bng cch thu gi tr PCR nhn c trong b ghp knh pha trc v chn chng vo vng lp kha pha thch hp.

STB c kh nng hin th hnh nh khng li trong vng 5 min.

STB will detect the transmission line including several programs with PCR jitter of 50 (s.

PAL video signal is monitored on the display monitor.

Expected Results:

Audio and video in mute mode while recording system time clock (STC) (forwarding to the crease and seamlessly when customers switch channels). Muffler code will be able to:

- recover the STC by using PCR with maximum jitter +/- 50 us.

- track long-term variations in the frequency of the encoder's STCFor each service, the demultiplexer shall recover the source clock by extracting the associated PCR values received within the incoming multiplex and insert them into the appropriate Phase Locked Loop.

STB is able to display images with not errors within 5 min.

A.5 Audio and video equipment

A.5.1 Decoding image with aspect ratio 16: 9 displaying on screen 4: 3.

Test measurement

- Equipment:

Image A.8 - Measurement chart for decoding image with aspect ratio 16: 9 displaying on 4: 3 screen

- Test procedure:Multiplexer include a number of services with the aspect ratio of 4: 3 and a service with the aspect ratio of 16: 9. All services in the multiplexer be stored in de-multiplexing before recording.STB shall detect the transport stream with the services the on the aspect ratio of 16: 9.

It is necessary check the receiver with the capability to transmit at least one signal suitable to 4:3 aspect ratio. Such suitable signal shall consist of the following formats:

Center cut-out format, possible with lines/scan

Letterbox format

Expected results:The viewer shall be able to choose between the following storable display mode preferences:

1.Display picture part by use of transmitted pan vectors or if the pan-vectors are not present, display with letterbox conversion. (Default mode in decoder settings)

2.Display 16:9 material in letterbox regardless of pan-vectors 3.Display picture part by use of transmitted pan vectors or if the pan-vectors are not present display with center cut-out.A.5.2 Image Decoding - Conversion to lower display rate- Test procedure:

Equipment

Tn hiu o c to ra theo s o sau:

Measured signal is generated according to the measurement chart below:Image A.9 - Measurement chart of the Conversion to lower display rate- Test procedure:

Using STB to detect the transport stream including streaming services in redundancy with the valid input resolution ( 720x576, 544x576, 480x576, 352x576, 352x288 pixels - Video resolutions supported) and the valid output resolution to be converted down to respective 1/16 of displayed screen size (360x288 and 180x144 size) shall be implemented.Expected Results:Down-conversion from any valid input resolution(720x576, 704x576, 544x576, 480x576, 352x576, 480x288, pixels) to 1/4 respective 1/16 of displayed screen size(360x288 and 180x144) shall be implemented. It shall be possible to locate the downconverted video anywhere on the screen.

Figure A.10 - Measure chart of output image - TeletextA.5.3 Output image - Teletext (Television text) pagesTest procedure:

- Equipment:Using STB to detect TV services including ITU-R Teletext services of System B.The Teletext data in the VBI as inserted in the lines 6 to 22 and lines 320 to 335 should be examinedIn parallel with the STB case, a teletext screen is used shall be available to present the decoded Teletext pages.Expected results:

Check the ITU-R Teletext page data of System B being inserted into the VBI of the analogue CVBS video output.

The figures of teletext pages shall be inserted into the VBI in the lines 6 to 22 and lines 320 to 335.A.5.4 u ra hnh - Ph

A.3 Digital signal input

A.3.1 K thut iu ch v tc k hiu

Test procedure

- Thit b:

Thit b pht hnh s

Thit b pht tn hiu th cho cp

Hnh A.3 - S o k thut iu ch v tc k hiu

- Th tc o:

Pht mt knh s ti 442 MHz. Thay i iu ch v tc k hiu trn knh s nh sau:

16 QAM with 4 MS/s and 7 MS/s

64 QAM with 4 MS/s and 7 MS/s

Expected result:

STB c c tnh RF tt hn hay bng cc gi tr sau:

Tc k hiu: 6 n 7 Mbaud

iu ch: 16-, 64-, 128-, and 256-QAM.

STB thu c v gii m hnh nh m khng c mo hnh.