EN55032测试中的音频和视频接口信号要求

  • Audio signals

For EUTs that support audio signals, the signal used to exercise the EUT shall be a 1 kHz sinusoidal signal unless otherwise specified as more appropriate by the  manufacturer.

 

  • Video signals

EUTs that display video images or  EUTs with ports that are used to provide video signals   shall be exercised in accordance with Table B.1 and configured, where possible, using the parameters given in Table B.2.

Video ports shall output signals, and images shall be displayed, corresponding to the highest complexity level listed in Table B.1 that the EUT is capable of generating. However, the manufacturer may choose to exercise the displays and video ports using the text image given    in Table B.1 (Complexity level 2) where emission levels using this text image are not reduced    in comparison to emission levels obtained using Complexity levels 3 or  4.

Table B.1 – Methods of exercising displays and video  ports

 

Complexity Level Display image Description Examples of equipment
4 (Most) Colour bars with moving pictureelement Standard television colour bar signal according to ITU-  R BT 1729 with an additional small moving element.  See a. Digital television set, set-top box, personal computer, DVD equipment, video gameconsole, stand alone  monitor.
3 Colour bars Standard television colour bar signal according to ITU-R BT 471-1. See a. Analogue television set,display on camera, display on photo printer.
2 Text image Where possible a pattern consisting of all H characters shall be displayed. The character size and number of characters per line shall be set so that typically   thegreatest number of characters per screen is displayed. If text scrolling is supported on the display, the text shall scroll. POS terminal, computer terminal without graphic capability.
1 (Least) Typical display The most complex display that can be generated by the EUT. An EUT with  proprietarydisplays and/or not capable of displaying any of the above images, electronic music

keyboard, telephone.

a         This display image is also valid for monochrome displays which will display grey scale bars. 

When there is more than one display or video port, each display/port shall be exercised  appropriately  subject  to  the provisions of B.2.2.

 

The display images may be modified, when necessary to exercise primary functions of the EUT. Where possible, these modifications should be restricted to the bottom or top half of the display area so that the image defined in the table fills the  majority of the display.

 

For analogue television sets, only colour bars should be displayed, defined in complexity 3.




 

Table B.2 – Display and video parameters

Function Setting
Hardware acceleration Maximum.
Screen settings Highest effective resolution (including the settings for pixel and frame    rate).
Colour quality Highest colour bit depth.
Brightness, contrast, colour saturation Use either the factory default settings or typical   settings.
Other Adjusted to obtain a typical picture using settings giving the highest    performance.
  • Digital broadcast signals

Examples of digital broadcast signal specifications are shown in Table  B.4.

  • Other signals

Other ports shall be exercised using the methods defined in Table  B.3.




Table B.3 – Methods used to exercise ports

Port Methods used to exercise  port
Broadcast receiver tuner port The modulation of the RF signal carrier shall be set according to the system for which the EUT is intended.Unless otherwise defined, the input signal level at the relevant ports shall be sufficient to provide a  noise-free picture and/or audio

In addition refer to B.2.1 and  B.2.2

Examples of digital broadcast signal specifications for digital broadcast receiver ports are given in Table B.4.

The radiated emissions and mains power port conducted emissions from an EUT with broadcast reception functionality shall be assessed when tuned to one channel in each

reception mode, for example: analogue TV, DVB-T, DVB-C, analogue radio, digital radio etc.

For guidance on how to determine channel/s for conducted measurements on the broadcast receiver tuner port see  C.4.2.1.

Wired network port A representative signal shall be defined by the   manufacturer.For ports supporting Ethernet traffic (for example 100Base-T, 1000Base-T), that can operate   at multiple rates, measurements may be limited to mode in which the EUT operates at its

maximum rate.

When assessing an EUT transmitting 10Base-T Ethernet traffic, apply the    following:

In order to make reliable emission measurements representative of high LAN utilization it is only necessary to create a condition of LAN utilization in excess of 10 % and sustain that

level for a minimum of 250 ms. The content of the test traffic should consist of both periodic and pseudo-random messages in order to emulate realistic types of    data transmission.

(Examples of pseudo-random messages: files that are compressed or    encrypted.

Examples of periodic messages: uncompressed graphic files, memory dumps,    screen

updates, disk images.) If the LAN maintains transmission during idle periods, measurements shall also be made during idle  periods.

All other ports not defined above A representative signal shall be defined by the   manufacturer.