Patent ID: 7605687

Claim:
An ambient condition detector to detect at least one ambient condition comprising: control electronics with audio pitch control; at least one ambient condition sensor to sense an ambient condition coupled to the control electronics with audio pitch control; at least one audio output transducer coupled to the control electronics with audio pitch control; the control electronics with audio pitch control outputs an alarm tonal pattern through the at least one audio output transducer when the at least one ambient condition sensor detects an ambient condition, the tonal pattern comprising at least two distinctly different tone pitches with at least one silent period within the tonal pattern occurring between the distinctly different tone pitches; the at least two distinctly different tone pitches differ by at least a frequency of 500 Hz so a tonal pattern emitted by the at least one audio output transducer may be heard by a wide range of users including users with a hearing sensitivity deficit; and the at least one ambient condition sensor comprises at least one of a smoke sensor, a fire sensor, thermal sensor, a gas sensor, a motion sensor, or a radiation sensor.