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RFAnalyzer/Demodulator.java at master · demantz ... - …
https://github.com/demantz/RFAnalyzer/blob/master/app/src/main/java/com/mantz_it/rfanalyzer/Demodulator.java
private static final int AUDIO_RATE = 31250; // Even though this is not a proper audio rate, the Android system can // handle it properly and it is a integer fraction of the input rate (1MHz). // The quadrature rate is the sample rate that is used for the demodulation:
Data to audio and back. Modulation / demodulation with ...
https://stackoverflow.com/questions/4976213/data-to-audio-and-back-modulation-demodulation-with-source-code
The demodulation would be an (optional) 10KHz filter followed by comparing with a threshold. This is a fairly simple scheme to implement. Generally the higher the signal frequency and your available bandwidth, the faster you can switch that signal on and off.
Android Audio Framework Architecture - Bits & Qubits
http://gopinaths.gitlab.io/post/android-audio-framework-architecture/
Android audio architecture defines how audio functionality is implemented and points to the relevant source code involved in the implementation. Application framework. The application framework includes the app code, which uses the android.media APIs to interact with audio hardware.
RF Analyzer - Apps on Google Play
https://play.google.com/store/apps/details?id=com.mantz_it.rfanalyzer&hl=en_US&gl=US
Use an OTG (on-the-go) USB cable to connect your HackRF/RTL-SDR to an Android phone/tablet and this app will visualize the RF spectrum (frequency magnitude and waterfall plot)! ... - AM/FM/SSB audio demodulation - adjust squelch and channel width - Record to a raw IQ file compatible with hackrf_transfer, ... - Bookmarks
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