Receiving Pulse-Code Modulation on AM radio?

[Radium]

Hi:

Hypothetical situation: a PCM audio signal [24-bit and monoaural] is
transmitted through an analog 150 Khz AM carrier, an AM receiver on the
other end [tuned to 150 Khz] picks up the signal, and the reciever is
attached to a device that can recieve, process, and decode the PCM
audio back to analog and then send it to a loudspeaker. However -- in
this theoretical situation -- the environment is filled with magnetic
interference that affects all AM stations.

My question: Will the received PCM audio signal remain noticeably
"clean" to the listener or will he/she notice the magnetic disruptions
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 static would
cause noticeable auditory disruptions when compared to analog. Do I
guess correct?


Thanks,

Radium

 

[John Larkin]

Hi:

Hypothetical situation: a PCM audio signal [24-bit and monoaural] is
transmitted through an analog 150 Khz AM carrier, an AM receiver on the
other end [tuned to 150 Khz] picks up the signal, and the reciever is
attached to a device that can recieve, process, and decode the PCM
audio back to analog and then send it to a loudspeaker. However -- in
this theoretical situation -- the environment is filled with magnetic
interference that affects all AM stations.

Won't work. The data bit rate (for 44 KHz sampling) is 1.05 MHz, too
much to put on a 150 KHz AM carrier, at least without insanely exotic
modulation tricks.

John

 

[Radium]

Hi:

Hypothetical situation: a PCM audio signal [24-bit and monoaural] is
transmitted through an analog 150 Khz AM carrier, an AM receiver on the
other end [tuned to 150 Khz] picks up the signal, and the reciever is
attached to a device that can recieve, process, and decode the PCM
audio back to analog and then send it to a loudspeaker. However -- in
this theoretical situation -- the environment is filled with magnetic
interference that affects all AM stations.

Won't work. The data bit rate (for 44 KHz sampling) is 1.05 MHz, too
much to put on a 150 KHz AM carrier, at least without insanely exotic
modulation tricks.

John

Just what are these "insanely exotic modulation tricks"?

 

[Radium]

Hi:

Hypothetical situation: a PCM audio signal [24-bit and monoaural] is
transmitted through an analog 150 Khz AM carrier, an AM receiver on the
other end [tuned to 150 Khz] picks up the signal, and the reciever is
attached to a device that can recieve, process, and decode the PCM
audio back to analog and then send it to a loudspeaker. However -- in
this theoretical situation -- the environment is filled with magnetic
interference that affects all AM stations.

Won't work. The data bit rate (for 44 KHz sampling) is 1.05 MHz, too
much to put on a 150 KHz AM carrier, at least without insanely exotic
modulation tricks.

John

What is we use a 3 MHz AM carrier, instead?

 

[Tim Williams]

My question: Will the received PCM audio signal remain noticeably
"clean" to the listener or will he/she notice the magnetic disruptions
affecting the audio?

Think data error.

Tim

 

[Radium]

Think data error.

Could heterodynes [often heard as frightening high-pitched tones on
analog AM radio] cause data errors [or any other disruptions] in a
digital device receiving PCM signals on an AM station?

 

[Eeyore]

Hi:

Hypothetical situation: a PCM audio signal [24-bit and monoaural] is
transmitted through an analog 150 Khz AM carrier, an AM receiver on the
other end [tuned to 150 Khz] picks up the signal, and the reciever is
attached to a device that can recieve, process, and decode the PCM
audio back to analog and then send it to a loudspeaker. However -- in
this theoretical situation -- the environment is filled with magnetic
interference that affects all AM stations.

Won't work. The data bit rate (for 44 KHz sampling) is 1.05 MHz, too
much to put on a 150 KHz AM carrier, at least without insanely exotic
modulation tricks.

John

Just what are these "insanely exotic modulation tricks"?

They're more insane even than you !

Graham

 

[John Larkin]

Hi:

Hypothetical situation: a PCM audio signal [24-bit and monoaural] is
transmitted through an analog 150 Khz AM carrier, an AM receiver on the
other end [tuned to 150 Khz] picks up the signal, and the reciever is
attached to a device that can recieve, process, and decode the PCM
audio back to analog and then send it to a loudspeaker. However -- in
this theoretical situation -- the environment is filled with magnetic
interference that affects all AM stations.

Won't work. The data bit rate (for 44 KHz sampling) is 1.05 MHz, too
much to put on a 150 KHz AM carrier, at least without insanely exotic
modulation tricks.

John

Just what are these "insanely exotic modulation tricks"?

You'd have to research communications theory. Google "information
theory" and "Shannon capacity" to start.

John