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Receiving Pulse-Code Modulation on AM radio at 3 Mhz?
Radium wrote: My question: Will the received PCM audio signal remain noticeably "clean" to the listener or will he/she notice the EMI, RFI, and heterodynes affecting the audio? I ask because I think -- but definitely don't know -- that because the received signal is digital, it is less likely that the EMI, RFI, and heterodynes would cause noticeable auditory disruptions when compared to analog. Do I guess correct? You guess correct, assuming that FEC is applied to the digital signal before it is used to modulate the transmitter. But you wouldn't do it that way anyway. Raw PCM is too bandwidth inefficient. You'd use MPEG layer 2, or apt-X, or something like that to reduce the bandwidth without noticeably degrading the audio quality. You'd probably also multiplex several different channels (programmes) together onto one RF carrier as well, to make better statistical use of the RF bandwidth. Cheers Mike |
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