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Added pre-transmission beep

A project log for Audio delay and VOX using ESP32

This simple project implements an audio delay and time-shifing VOX using the ESP32S ADC and DAC capabilities.

J ReynoldsonJ Reynoldson 12/11/2018 at 01:060 Comments

As I wanted to be able to use transmitters that didn't externalise the PTT, and also because I wanted to alert the final receivers that the transmission was a crossband one, I have added a beep that sounds before the delayed voice.  This can be heard by the receivers, and also serves to give the transmitter VOX something to trigger it quickly.

In addition, I added a flag to stop DAC output unless the delay VOX was triggered so that the quiescent input signal to the transmitter VOX would be as quiet as possible.

Code update soon.

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