Sennheiser HMD 46 - ANNEXE 145 User Manual download pdf (Page 13)

SCOOPY+ - User Manual

2.1.

Transmission interfaces

The SCOOPY+ features in all versions an Ethernet interface for IP protocol networks.

One ISDN, PSTN/POTS and mobile network access is optionally available.

2.1.1. Ethernet/IP interface

The IP interface is a 10BaseT/100BaseT Ethernet interface allowing transmission of the audio

programmes in a wide range of possible bit rates. The audio stream is always transported under the

RTP/UDP protocol.

IP unicast mode

The most classical transmission mode is unicast: audio connection with one distant device, generally

bidirectional. This mode can be used on all types of networks links, LAN or WAN, including links via

Internet. The SCOOPY+ implements the SIP protocol, which allows it to interoperate with IP phones

and other SIP compatible audio codecs, in a way similar to ISDN or POTS connections. Links can be

set up in two ways:

x ´3HHUWRSHHUµFRQQHFWLRQEHWZHHQWZRFRPSDWLEOHXQLWV

x Use of a SIP proxy server to set up the link, or a SIP PBX

Details about the SIP protocols can be found in the annex (see 7.2, Overview of the SIP protocol).

The audio coding algorithm can be selected depending on the required quality and the available

network bandwidth. The following algorithms are currently available:

Codec

Bit rate

(coding)

Bit rate

(total)

Audio

bandwidth

Typical use, main features

G711

64 kbit/s

86 kbit/s

3 kHz

Voice, telephony

Compatible with IP phones

CELP

24 kbit/s

28,5 kbit/s

7 kHz

Suitable for high quality speech;

Low network bandwidth consumption

G722

64 kbit/s

86 kbit/s

7 kHz

High quality speech.

Compatible with some IP phones.

MPEG Layer II

64 to 256

kbit/s

73 to 275

kbit/s

Up to

20 kHz

Highest quality, suitable for speech and

music

MPEG AAC-LC

16 to 256

kbit/s

30 to 277

kbit/s

Up to

20 kHz

Low bit rate, suitable for speech and

music

MPEG HE-AAC

and HE-AAC v2

16 to 128

kbit/s

23 to 139

kbit/s

Up to

20 kHz

Very low bit rate, suitable for speech and

music

4SB ADPCM

128 or

256 kbit/s

173 or

301 kbit/s

15 kHz

Low latency, suitable for speech and

music

Table 2 ² Overview of algorithms available in IP mode

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