Hi Kyle, I was looking at your "EQ with Your Ears" course on the audio university webpage. Ever since the sales end, I can't find out how I could purchase the course. It only tells me that the sale has ended but there is no page where you can pay the original price and get access to the course😅. Is this intended?
frequency modulation turns a wide noisey 200khz channel into a clean 20khz audio channel or 15khz in actual FM radio. there's a certain theory for that but you can look at it from a kind of information perspective: an 80khz 4bit channel has a 24db signal to noise ratio, a 20khz 16bit channel uses the same amount of data but has a 96 db ratio. To improve the signal in an AM setting like that you need to crank up the power by 72 db which is about 20 million times. FM doesn't have 100% efficiency but that's more or less what it does. a wide 24db channel __--------__ into a narrow __--__ but 'higher' say 80db channel, both cover more or less the same surface area. The stereo part of FM stereo is AM modulated at 38khz there it loses lots of that 'frequency spread out' advantage the ratio is alot lower so the stereo part of FM stereo is alot noisier. You can kind of picture how FM 'works' by looking at it from a really low freq or bass to FM modulation perspective: say you have a short sample of sine waves, 100 of them like "~~~~~" and another one at a slightly higher frequency 101 cycles. If you put them next to each other one is clearly distinguisable from the other, noise would really have to 'destroy' the whole thing. If you take a snippet 1/20 of these samples you get 5 cycles vs 5.05, now it becomes alot harder to tell them apart noise can creep in.
This is very interesting. Do all transmitters transmit 100kz above and below the carrier? So in effect, if you’re transmitting at 432 MHz you’re actually using 431.9-432.1 MHz? Also; with the air full of frequencies, how does that affect a person’s bio-rhythms?
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It's complicated but helpful
Hi Kyle, I was looking at your "EQ with Your Ears" course on the audio university webpage. Ever since the sales end, I can't find out how I could purchase the course. It only tells me that the sale has ended but there is no page where you can pay the original price and get access to the course😅. Is this intended?
frequency modulation turns a wide noisey 200khz channel into a clean 20khz audio channel or 15khz in actual FM radio. there's a certain theory for that but you can look at it from a kind of information perspective: an 80khz 4bit channel has a 24db signal to noise ratio, a 20khz 16bit channel uses the same amount of data but has a 96 db ratio. To improve the signal in an AM setting like that you need to crank up the power by 72 db which is about 20 million times. FM doesn't have 100% efficiency but that's more or less what it does. a wide 24db channel __--------__ into a narrow __--__ but 'higher' say 80db channel, both cover more or less the same surface area. The stereo part of FM stereo is AM modulated at 38khz there it loses lots of that 'frequency spread out' advantage the ratio is alot lower so the stereo part of FM stereo is alot noisier.
You can kind of picture how FM 'works' by looking at it from a really low freq or bass to FM modulation perspective: say you have a short sample of sine waves, 100 of them like "~~~~~" and another one at a slightly higher frequency 101 cycles. If you put them next to each other one is clearly distinguisable from the other, noise would really have to 'destroy' the whole thing.
If you take a snippet 1/20 of these samples you get 5 cycles vs 5.05, now it becomes alot harder to tell them apart noise can creep in.
This is very interesting. Do all transmitters transmit 100kz above and below the carrier? So in effect, if you’re transmitting at 432 MHz you’re actually using 431.9-432.1 MHz? Also; with the air full of frequencies, how does that affect a person’s bio-rhythms?
These are interesting questions, Chuck. I don’t know the answers!
The waves pass through u ur not affected it’s a reflector. Think of it like a record player in the air
👏
Really good explanation. Thank you.
Thank you very much, you do great work!
Glad you enjoy it!
Very interesting!, so for Amplitude Modulation would it work the same way?
Yes. But rather than modulating the frequency, it modulates the amplitude.
This was great!
Thanks!
This is brilliant
Way better explanation than my college teacher, thank you 🙏
Cheers.