Good day everyone,
I am pretty new to digital filtering and AM modulation, and demodulation in general. I have designed and constructed an analogue AM modulator/demodulator, and I have recently designed a digital filter (FIR). My goal, however, is to make an AM demodulator using the STM32F429. I plan to use my analogue AM modulator to feed an AM signal to the ADC (Planning on interleaving ADCs) of the STM32. After that, I want to use a digital filter to allow me to select a particular frequency channel and filter out the rest within the AM band ( 535.5 kHz to 1606.5 kHz ). But unfortunately, this is where my thought of the process fades. I understand that a bandpass filter allows one to select a specific frequency range to pass (Passband between shoulder frequencies FL and FH), but how would one approach a situation where one would want to select a channel at every 9 kHz, for example. Would one use multiple bandpass filters for every channel (120 bandpass filters in this case)? Or would one build a type of bandpass filter that adjusts for every 9kHz to the change of the AM signal's frequency? Thank you for everyone's input and time.
Greetings,
Ryan
I am pretty new to digital filtering and AM modulation, and demodulation in general. I have designed and constructed an analogue AM modulator/demodulator, and I have recently designed a digital filter (FIR). My goal, however, is to make an AM demodulator using the STM32F429. I plan to use my analogue AM modulator to feed an AM signal to the ADC (Planning on interleaving ADCs) of the STM32. After that, I want to use a digital filter to allow me to select a particular frequency channel and filter out the rest within the AM band ( 535.5 kHz to 1606.5 kHz ). But unfortunately, this is where my thought of the process fades. I understand that a bandpass filter allows one to select a specific frequency range to pass (Passband between shoulder frequencies FL and FH), but how would one approach a situation where one would want to select a channel at every 9 kHz, for example. Would one use multiple bandpass filters for every channel (120 bandpass filters in this case)? Or would one build a type of bandpass filter that adjusts for every 9kHz to the change of the AM signal's frequency? Thank you for everyone's input and time.
Greetings,
Ryan