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Passbands - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/passbands
If two signals fall within the passband of a receiver, they will both compete to be heard. They will also heterodyne together in the detector stage, producing an audio tone equal to their carrier frequency difference. For example, suppose we have an …
Easy Audio Bandpass Filter Kit - QRP Kits
http://www.qrpkits.com/files/AFBPF_Manual_V4_20160707.pdf
Easy Audio Bandpass Filter Kit Description and Specifications The Audio Frequency Band Pass Filter kit from qrpkits.com provides A basic audio filter kit with preamp, op-amp filter and LM386 audio amp to drive headphones or speaker. It has a peak in audio response that is tunable from approximately 300Hz to 2Khz and has a bandwidth
1200 baud data transfer over audio passband of …
https://www.eevblog.com/forum/projects/1200-baud-data-transfer-over-audio-passband-of-cellphone-is-that-possible/25/
Hello, Not exactly 1200bps, but if you're trying to get binary data through the audio channel of a cell phone (or any phone for that matter), you might try borrowing the portions of the FSK encoding used by TTYs/TDD. Although their use is declining, this baudot infrastructure is still active today. The core encoding is half duplex FSK, traditionally it's 45.4 bauds/bps.
How to Build a Passive Bandpass Filter Circuit
http://www.learningaboutelectronics.com/Articles/Passive-bandpass-filter-circuit.php
In this example, the passband is 200Hz-2KHz. The low cutoff frequency would be 200Hz and the high cutoff frequency would be 2KHz. The low cutoff and high cutoff frequenices are the 2 points in the passband in which there is a 3dB drop in amplitude. A 3dB drop equals 0.707VPEAK.
1200 baud data transfer over audio passband of …
https://www.eevblog.com/forum/projects/1200-baud-data-transfer-over-audio-passband-of-cellphone-is-that-possible/
It is the audio passband? How about trying different mark/space frequencies (which will make the modem non-standard)? How about increrasing the audio volume to distortion levels? How about passing fake voice signals to the passband other than the mark and space frequencies to trick the codec?
Ham Supply LogiKit SCAF-1 – Bandpass Filter
https://www.hamsupply.com/logikit-scaf-1-noise-filter/
The audio passband must be capable of passing such signals through. The designers have accomplished this beautifully – and as a result, when using narrower band modes, off frequency QRM can be passed through with brilliant fidelity. Even if you don’t want to hear it. And then there is white noise – noise created in the IF and the audio ...
A Simple Synchronous-AM Demodulator and …
https://www.arrl.org/files/file/Technology/tis/info/pdf/9709qex003.pdf
The DDC passband is widened to 13672 Hz, to give an audio passband of 0 to 6836 Hz, to maximize audio fidelity while keeping the over-sampling ratio a power of two. The PLL forces the dc component of the Q output to be zero. This puts the I component of the HFO in phase with the incoming carrier so that the I output has the demodulated audio.
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