Breathing biofeedback device

A breathing biofeedback device, comprising:

• a microphone configured to convert breathing related sound signals into a first output signal;
• a preamplifier amplifying the first output signal to generate a second output signal;
• a variable gain amplifier operable to amplify the second output signal in accordance with a gain level signal to generate a third output signal;
• a controller comprising an audio envelope detector operable to receive the second output signal from the preamplifier, wherein the controller is operable to generate the gain level signal in response to an analysis of an output of the audio envelope detector and wherein the gain level signal increases in response to an increase in a volume level of the second output signal and decreases in response to a decrease in the volume level of the second output signal;
• and earphones operable to convert the third output signal into breathing sound signals output to a user, wherein the controller further comprises a state machine configured to detect a type of breath cycle and further wherein the controller is configured to operate in one of several functional modes based on the type of breath cycle detected, wherein the functional mode is selected from a group consisting of:
• a basic mode for enabling a user to set one of an output volume and effects preset to the breathing sound signals output to the user, an anti-snore mode operable to detect breath cycles associated with snoring, a stress reduction mode operable to add additional sounds to the breathing sound signals output to the user, and a fitness training mode operable to add a sound of a pulse to the breathing sound signals output to the user.