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#41
September 14th 06, 08:14 PM
posted to sci.electronics.basics,sci.physics.electromag,rec.radio.shortwave,rec.radio.amateur.equipment,uk.radio.amateur
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Receiving Pulse-Code Modulation on AM radio at 3 Mhz?
"Michael A. Terrell" wrote:
That is a SPL chart with the dB levels referenced to 0 dB SPL = 0.0002 µbar. errrr,,, excuse me ...but.... scratches head trying to see since when has a fraction of microBar had any effect on an rf link using any sort of modulation ? |
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#42
September 14th 06, 08:16 PM
posted to sci.electronics.basics,sci.physics.electromag,rec.radio.shortwave,rec.radio.amateur.equipment,uk.radio.amateur
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Receiving Pulse-Code Modulation on AM radio at 3 Mhz?
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#43
September 20th 06, 08:22 PM
posted to sci.electronics.basics,sci.physics.electromag,rec.radio.shortwave,rec.radio.amateur.equipment,uk.radio.amateur
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Receiving Pulse-Code Modulation on AM radio at 3 Mhz?
Brian Reay wrote:
"Mike Gathergood (G4KFK)" wrote in message oups.com... Radium wrote: What is FEC? Forward Error Correction. Google it :-) Just to add to Mike's comment, FEC works by send the same message several times- in simple terms, in the hope that one with get through correctly. You may want to read up on Viterbi, Sequential, Turbo Product Codes (TPC) and Low Density Parity Check (LDPC) forms of FEC to see how they work and see if that statement still holds true! It's truly amazing how many errors Turbo codes and LDPC codes can actually correct even with only an additional 5% of error correction coding on top of the data stream in some cases! |
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