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SCOOPY+ S - User Manual
2.2.1. G711 coding
Application: telephony, coordination. Low latency.
G711 is the standard coding used for voice transmission on public telephone networks, and features 300
to 3400 Hz audio bandwidth. This algorithm is typically used for links over IP networks with IP
telephones or VoIP gateways. Via ISDN, G711 is used for links with telephones or hybrid devices.
G711 is available only for IP or ISDN transmission
2.2.2. Mobile telephony coding: GSM , AMR
Application: telephony, mobile coordination. Moderate latency.
These algorithms are exclusively used for speech transmission over mobile telephone networks, with a
300 to 3400 Hz audio bandwidth. Gateways perform, whenever needed, transcoding in order to
interface with fixed PSTN, ISDN and IP networks.
2.2.3. Mobile HD Voice coding: AMR-WB
Application: commentaries, mobile coordination. Moderate latency.
The AMR-WB coding (standardised as G722.2 by the ITU-T) is used between compatible mobile
terminals, when the mobile network supports the so called "HD Voice" service, and provides speech
transmission with a 50-7000 Hz bandwidth.
SCOOPY+ S automatically implements this algorithm in mobile voice mode every time it is possible, and
automatically falls back to standard voice coding if not (when network does not support, or the remote
terminal is not compatible).
Unfortunately it is not possible to see directly whether AMR-WB is active or not at a given moment.
You have to rely on your listening skills! However, it has to be active if the conditions are met: a)
support from the network on both sides of the link, b) both terminals compatible, c) service
continuity from end to end1
2.2.4. CELP coding
Application: commentaries, coordination. Low capacity transmission channels
This algorithm operates in mono for a net nominal bit rate of 24 kbit/s, and provides 7 kHz bandwidth
and a quality close to G722 for a much lower bit rate.
CELP is available for IP or PSTN networks. For PSTN (POTS), the bit rate may be reduced to adapt for the
line quality, among the following values: 12 kbit/s, 14.4 kbit/s, 16.8 kbit/s, 19.2 kbit/s, 21.6 kbit/s,
24 kbit/s. The bandwidth is reduced accordingly.
Still for POTS lines, in addition to the normal mode two "protected modes" are available, bringing an
increased resistance to transmission problems, however with an increased latency as well.
1 At the time of writing, this requires both units to be on the same network: same operator, same country
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