ASSMANN Electronic AK-107001 Fiche technique télécharger pdf (Page 238)

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HDMI (High Denition Multimedia Interface) is an interface for transmitting digital audio

and video data und video data which was mainly developed for connection to devices

from the Home Video Area (televisions/recorders, set top boxes, camcorders and SAT/

cable receivers, for example). The HDMI is downwards compatible to established DVI

(Digital Visual Interface). This means that an HDMI-DVI adapter cable can connect a DVD

player with an HDMI output to a projector with a DVI input, for example.

It is important for all HDMI and DVI connections that both connected components (hard-

ware/device/interface) are provided with HDCP copy protection. Transmission of encryp-

ted, digital video data according to this standard is not possible without HDCP!

PLEASE NOTE ! DVI has existed in the computer area for some time – without HDCP ho-

wever. Many projectors and also a few plasma TV devices come from the computer area

and have therefore not implemented HDCP.

HDMI has been continuously developed in recent years. This reects in the states of the

corresponding versions: HDMI 1.0, HDMI 1.1, HDMI 1.2, HDMI 1.2a, HDMI 1.3 and now

currently HDMI 1.4. HDMI 1.3 doubles the band width of the data rate from previously 4.5

Gbit/s (165 Mhz) to 10.2 Gbit/s (340 Mhz) compared to the previous version 1.2. Another

plug type has been established with the introduction of HDMI 1.3.

HDMI Typ A Plug (left), Mini HDMI Typ C Plug (right)

The greatest confusion is with 1080p (full HD). Since 1080p was also a topic in the media

with the introduction of HDMI 1.3 onto the market, several people have the impression

that HDMI 1.3 is required for 1080p. In fact both these terms have nothing to do with

each other. 1080p was already a part of the HDMI specications already in Version 1.0.

Additional data rates were introduced with HDMI 1.3 which were above those of 1080p.

The problem of possible data losses in longer cable lengths –usually after approximately

3-5 meters – was already a topic when HDMI 1.3b was introduced. There are factors

here which inuence the signal quality which have mainly to do with the cable: the perfor-

mance of the HDMI interface in transmitting and receiving devices and also the transfer

rate of the signal also play a role. The higher the latter is, the shorter the „non problema-

tic“ cable length is. If a 4.95 Gbit/s signal could be transmitted with a previous HDMI with

a cable length of up to 10 meters, for example, this length shortens now with the HDMI

1.3b to only 5 meters.

Important: All existing HDMI cables also transmit data in accordance with HDMI 1.3b.

This is only guaranteed up to 4.95 Gbit/s however, in other words slightly less than half

of the maximum data rate of the HDMI 1.3b. The following therefore has to be taken into

consideration: HDMI 1.3 denes the maximum data rate but it does not increase the data

rate of a given signal. An existing 1080p signal transmitted with HDMI 1.3b will continue

to run with HDMI 1.3b - with the same quality and the same cable length. The quality

of the cable will start to be decisive only when the connected components replace the

new technical improvements possible with HDMI 1.3b to send correspondingly higher

synchronized signals.

HDMI

Jack plugs and sockets are internationally widespread. They are used, for example,

for relaying audio signals or for connection to a mains unit for the power supply to a

compact device. Jack plugs are very often used for connecting headphones. They are

sometimes used for transmitting digital signals for control purposes.

Jack plugs are made with varying shaft diameters:

· 2.5 mm (seldom), used for especially compact devices such as headsets for cell

telephones. They are also use for data transmission between some pocket calcu

lators or for cable releases for photographic equipment. This plug size is known as

a „micro plug“.

· 3.5 mm, usually for portable devices (MP3 players, sound cards and small head

phones). Is also known as a „micro plug“.

· 6.35 mm, for stereo systems and practically all devices from the music production,

such as mixing desks, effect devices, synthesizers, keyboards, E pianos, E guitars

and guitar ampliers. They tolerate sufcient mechanical load and have a large

contact surface.

Various adapters are available on the market to connect devices with the varying

connection sockets by using a single cable. These are usually pushed on or screwed on.

One should always try to avoid using adapters wherever necessary. However, since the

number of contacts which are often faulty anyhow is increased by the adapter so that

data transmission becomes worse.

The jack plug types with two (Mono), three (Stereo) and four (Stereo + extra) contacts.

The stereo plug with the extra function is a variation of the stereo plug. Some multi

channel contacts for PC and cameras use these types of 4 pole connections because of

space problems.

Mono-Plug (2-pole): Sig = (sound)signalGND = ground (return line)

Stereo-Plug (3-pole): L = Left sound signal, R = Right sound signal, GND = common ground (return line)

Stereo-Plug with extra function (4-pole): L = Left sound signalR = Right sound signal, AUX = extra signal,

GND = common ground (return line)

Jack plugs

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