Microbit RRC-1258 MkII(s) Manual do Utilizador descarregar pdf (Página 230)

USER MANUAL

m crob t

RRC-1258 MKII

Ba1258B_RemoteRig_MkIIs-A33.docx

User manual

Rev. A33 – 2015 Jan 28

230 of 236

Appendix A - Audio coding

Quality 1 or 2 is recommended for short wave listening, they are good compromises between

quality and need for bandwidth. Practical test have shown that quality 0 (G711) is not the

optimal coding if the signal to noise ratio is low which is common on the shortwave bands.

Quality 8 gives a very good audio quality even if you listen to music on FM. 16 kHz sample

rate and 16 bits deep gives a very good dynamic range and a large SNR and good audio

bandwidth. Quality 11 and 12 can be used when very limit bandwidth is available, the audio

quality is reduced. The other qualities are more of academic interest. A good speaker is

always a good investment also.

Note – Different codings can be used in the uplink and downlink, which can be useful in

asymmetrical Internet links like ADSL and most mobile systems. Sample rate must be same

in both ends but coding can be different.

Audio

quality

Coding

Sample

rate

[kHz]

Bandwidth

dual-rx=0

[kbps]

Packet size

dual-rx=0

[ms]

Bandwidth

dual-rx=1

[kbps]

Packet size

dual-rx=1

[ms]

A-law (G711)

160

Linear-12bits

120

240

Linear-16bits

160

320

A-law (G711)

120

240

Linear-12bits

180

360

17,8

Linear-16bits

240

480

13,3

A-law (G711)

160

320

Linear-12bits

240

480

13,3

Linear-16bits

320

640

A-law (G711)

240

480

13,3

Linear-12bits

360

17,8

720

8,9

Linear-16bits

480

13,3

960

6,7

IMA ADPCM 4bits

192

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