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What is the difference between the Unite’s HD and SD audio modes?

  • Updated

Unite’s audio modes have different bandwidths and latencies. The listed latencies refer to transmission from a Unite master device to a Unite receiver.

Audio Mode

Radio Type

Latency

Frequency range

Connections in DECT region  EU*: Up to …

Connections in DECT region North America*: Up to …

Connections in DECT region Japan*:
Up to …

Remark

HD
(High quality)

Broadcast

~22 ms

50 – 14.000 Hz

32

14

14

One master device (TP,TH,AP4) transmits to multiple receivers (RP,RP-T).
Robust signal quality due to retransmission of the signal

SD
(Standard quality)

Broadcast

~19 ms

50 – 7000 Hz

32

20

20

One master device (TP,TH,AP4) transmits to multiple receivers (RP,RP-T).
Robust signal quality due to retransmission of the signal.

HD
(High quality)

Full-Duplex

~18 ms

50 – 14.000 Hz

32

14

14

Bi-directional connection between two devices:
RP-Talkback or Sub-Master (TP, TH)

and Master device (TP,TH,AP4)

SD
(Standard quality)

Full-Duplex

~14 ms

50 – 7000 Hz

32

20

20

Bi-directional connection between two devices:
RP-Talkback or Sub-Master (TP, TH)

and Master device (TP,TH,AP4)

 

Important notes:

  • The values for the maximum number of available channels are "up to" and can be achieved under ideal RF conditions.
  • The actual number of available channels that can be used simultaneously depends on the RF power setting and the environmental conditions.
  • The number can be additionally reduced by other DECT services in the same environment.
  • When using multiple Unite AP4 access points in the same receive/transmit area, the maximum number of channels can only be utilized if the access points are synchronized with each other to ensure stable operation.