System and method for narrow bandwidth digital signal processing

A system for narrow bandwidth digital signal processing of an input audio signal comprising:

• a pre-transmission module configured to receive the input audio signal and create a partially processed signal, wherein said pre-transmission module comprises:
• a high pass filter configured to filter the input audio signal to create a filtered signal,
• a first processing module configured to process the filtered signal to create the partially processed signal,
• a transmitter structured to transmit the partially processed signal,
• a receiver structured to receive the partially processed signal, and
• a post-transmission module configured to further process the partially processed signal to create an output signal, wherein said post-transmission module comprises:
• a splitter configured to split the received signal into a first signal and a second signal,
• a low pass filter configured to filter the first signal to create a filtered first signal,
• a pass through module configured to adjust the gain of the second signal to create a gain-adjusted second signal,
• a second processing module configured to process the filtered first signal and gain-adjusted second signal to create the output signal, wherein said second processing module comprises:
• a mixer configured to combine the filtered first signal and gain-adjusted second signal to create a combined signal;
• a tone control module configured the process the combined signal to create a controlled signal;
• and
• a second compressor configured to modulate the controlled signal to create the output signal.

A method for narrow bandwidth digital signal processing of an input audio signal comprising:

• filtering the input audio signal with a high pass filter to create a filtered signal,
• processing the filtered signal with a first processing module to create a partially processed signal,
• splitting the partially processed signal into a first signal and a second signal,
• filtering the first signal with a low pass filter to create a filtered first signal,
• adjusting the gain on the second signal with a pass through module to create a gain-adjusted second signal,
• processing the filtered first signal and gain-adjusted second signal with a second processing module to create an output signal,
• wherein the processing the filtered first signal and gain adjusted second signal comprises:
• combining the filtered first signal and gain-adjusted second signal with a mixer to create a combined signal;
• processing the combined signal with a tone control module to create a controlled signal;
• and
• modulating the controlled signal with a second compressor to create the output signal.

A system for narrow bandwidth digital signal processing of an input audio signal comprising:

• a high pass filter configured to filter the input audio signal to create a filtered signal,
• a first processing module configured to process the filtered signal to create a partially processed signal, wherein said first processing module comprises a first compressor configured to modulate the filtered signal to create the partially processed signal,
• a splitter configured to split the partially processed signal into a first signal and a second signal,
• a low pass filter configured to filter the first signal,
• a pass through module configured to adjust the gain of the second signal, and
• a second processing module configured to process the filtered first signal and gain-adjusted second signal to create an output signal, wherein said second processing module comprises a mixer configured to combine the filtered first signal and gain-adjusted second signal to create the output signal.