OK, I’ll try to be concise. Why did consumer AM radios get saddled with PLL detection?
I hear AM PLL demodulation as being squashed/compressed/denatured/limited in gradient, as opposed to old fashioned sine wave detection as being more open/natural/uncompressed.
If anyone else can hear what I’m talking about, please consider and chime in.
Mathematically, if we treat the two factors of rf, incoming and local as unlimited terms, which they’re not (for reasons of intermod we don’t want them to get too far out of proprotion), but by math if either input increases so does the output.
When one factor is limited to two states as in PLL detection, won’t the whole range of mathematic results be limited by the input terms of one factor being only zero or one?
What happens to all the gradient states of information? They must necessarily be
“mapped” to either zero or one.
If there is someone who can explain mathematically how all these gradient states can be quantized and accurately reproduced against a detection state of one or zero against an arbitrary voltage reference, I’d love to hear how it can be done.
All I can see is ones or zeroes after such a multiplication.
I was taught that this is WHY we don’t want the local oscillator signal to become
disproportionately larger than the incoming rf, unless we like that squashed sound as in
a communications receiver.
I hear AM PLL demodulation as being squashed/compressed/denatured/limited in gradient, as opposed to old fashioned sine wave detection as being more open/natural/uncompressed.
If anyone else can hear what I’m talking about, please consider and chime in.
Mathematically, if we treat the two factors of rf, incoming and local as unlimited terms, which they’re not (for reasons of intermod we don’t want them to get too far out of proprotion), but by math if either input increases so does the output.
When one factor is limited to two states as in PLL detection, won’t the whole range of mathematic results be limited by the input terms of one factor being only zero or one?
What happens to all the gradient states of information? They must necessarily be
“mapped” to either zero or one.
If there is someone who can explain mathematically how all these gradient states can be quantized and accurately reproduced against a detection state of one or zero against an arbitrary voltage reference, I’d love to hear how it can be done.
All I can see is ones or zeroes after such a multiplication.
I was taught that this is WHY we don’t want the local oscillator signal to become
disproportionately larger than the incoming rf, unless we like that squashed sound as in
a communications receiver.
