Parts list for building a radio to receive 200 Hz–20 kHz audio signal range

The discussion centers on building a radio receiver capable of capturing audio signals in the 200 Hz to 20 kHz range, specifically related to a cochlear implant system transmitting wireless signals within this frequency band. Clarification was sought on whether the goal was to receive modulated RF signals carrying audio or directly receive audio frequency signals. The implant transmits longwave (ULF) radio frequencies rather than Bluetooth or typical AM/FM bands, with the medical team located remotely. Suggested components include a bandpass filter (potentially at 455 kHz IF for AM), operational amplifiers, coils or loop antennas for magnetic coupling, and active tunable notch filters for frequency selection. The use of a loop or coil antenna is recommended over simple wire antennas to avoid interference and improve selectivity. A referenced ULF radio project circuit was tested, with questions about antenna connection, tuning mechanisms, and input/output usage. It was noted that the implant’s carrier frequency might be in the MHz range with amplitude-coded digital modulation, implying the received signal may not be directly audible without demodulation. The importance of obtaining detailed transmitter specifications from the implant manufacturer or medical team was emphasized to design an appropriate receiver and antenna system.
Summary generated by the language model.