Monitoring apparatus and methods for measuring physiological and/or environmental conditions

A removable audio headset connected to a wearable electronic device via an audio port of the wearable electronic device, the headset comprising:

• at least one earbud;
• at least one physiological sensor powered by a power supply of the wearable electronic device via the audio port of the wearable electronic device, wherein the at least one physiological sensor is configured to detect physiological information from a person wearing the headset and is configured to produce an electrical signal containing the physiological information;
• at least one microphone powered by the power supply of the wearable electronic device via the audio port of the wearable electronic device, wherein the microphone is configured to produce an audio signal containing audio information responsive to a verbal communication by the person;
• power conditioning circuitry configured to condition the power received from the power supply of the wearable electronic device and to adjust voltage and/or current supplied to the at least one physiological sensor;
• and
• modulation circuitry powered by the power supply of the wearable electronic device, wherein the modulation circuitry is configured to modulate the electrical signal produced by the at least one physiological sensor and the audio signal produced by the at least one microphone to create a modulated signal comprising both the audio information and the physiological information,
• wherein the modulation circuitry is configured to transmit the modulated signal via the audio port of the wearable electronic device, and wherein the wearable electronic device includes demodulating circuitry configured to receive and to demodulate the modulated signal.