Intercommunication system with adaptive transmit delay

A method of using Adaptive Transmit Delay to patch an audio source to a radio system, the method comprising:

• performing a training procedure to characterize an audible Talk Permit Tone coming from a radio in the radio system, wherein the training procedure comprises:
• keying the radio;
• listening for a first incoming audio stream from the radio in response to keying the radio;
• and
• performing a frequency analysis on the first incoming audio stream to generate an audio pattern, wherein the audio pattern is representative of the Talk Permit Tone;
• receiving an outgoing audio stream to be transmitted after the audio pattern has been generated;
• in response to receiving the outgoing audio stream to be transmitted:
• keying the radio;
• buffering the outgoing audio stream to be transmitted;
• listening for a second incoming audio stream in response to keying the radio;
• performing a frequency analysis on the second incoming audio stream;
• and
• matching the results of the frequency analysis of the second incoming audio stream to the audio pattern representative of the Talk Permit Tone to determine whether the second incoming audio stream is the Talk Permit Tone;
• and
• in response to determining that the second incoming audio stream is the Talk Permit Tone, sending the buffered outgoing audio to the radio.