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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 11: THE WORKS – Detailed Menu Reference 208

G.722actssimilarlytotheDualmodesdiscussedabove.AudioinputAis

encodedandtransmittedon"line1"whileAudioinputBistransmittedover

"line2".

Offers7.5kHzaudiofrequencyresponse.Delayisverylowat14milliseconds.

L2Stereo

L2J‐Stereo

Theseworksimilarlytotheequivale

ntLayer‐3modes.Twoconnectionsare

required.

L2Stereooffersdiscretestereotransmissionwith7.8kHzaudiofrequency

responsewhenthe48kHzSamplerateisusedifthetransmissionchannelis56

kbps.Itoffers9.8kHzfrequencyresponsewhenthe48kHzSamplerateisused

ifthetransmissionchannelis64k

bps.

L2J‐Stereooffers20kHzaudiofrequencyresponsewhenthesamplerateis48

kHzand15kHzresponsewhenthesamplerateissetto32kHz.

h

HOT TIP!

Of course you will want to use Layer 3 or AAC when supported at the far end.

We strongly recommend Layer 2 Joint stereo over Layer 2 Stereo when transmitting stereo

material in Layer 2 at 128kbps. While some loss of stereo image will occur, the reduced

compression ratio required will provide noticeably improved fidelity (.i.e. reduced artifacts).

Layer 2 stereo is appropriate only when the two channels to be transmitted are unrelated

sonically and must therefore be kept separate.

Z

ZEPHYR CLASSIC VS XSTREAM COMPARISON!

Some early Zephyr software releases refer to L2 Stereo as "L2 Dual". We changed the name

for two reasons. This mode cannot be used to send two mono streams to two sites. And,

because phase integrity of the two channels is maintained.

L2Mono128

Thismodeisverycommonmodeusedinthevoice‐overindustry.Itworksin

thesamewayastheotherMono128modes.

Offers19HzaudiofrequencyresponsewhentheSampleRateissetto48kHz

and15kHzresponsewhentheSampleRateissetto32kHz.

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