Wearable alert device having selectable alert volume and method of operating same
First Claim
Patent Images
1. A wearable alert device, comprising:
- a housing enclosing a sealed volume;
an audio transducer disposed in the sealed volume;
a driver circuit disposed in the sealed volume that selectively drives the audio transducer in either a single ended mode or a double ended mode responsive to an enable signal;
control circuitry disposed in the sealed volume that includes a personal area network (PAN) interface and a clock signal source that produces a clock signal, and which applies the clock signal and enable signal to the driver circuit responsive to receiving an alert message at the PAN interface, wherein the enable signal is controlled to have a state that is on, off, or alternating based on an audio profile used responsive to receiving the alert message.
3 Assignments
0 Petitions
Accused Products
Abstract
A wearable alert device includes an audio transducer and driver circuit that allows selection of either a high or low volume setting for driving the transducer. The driver circuit is operable in a single ended mode for low volume and a double ended mode for high volume. The single ended mode holds one terminal of the transducer low while the other is driven in correspondence with a clock signal, while the double ended mode drives one terminal in correspondence with the clock signal and the other terminal is inverted from the clock signal. The transducer is activated in response to an alert event, and can be driven according to a profile or pattern.
-
Citations
20 Claims
-
1. A wearable alert device, comprising:
-
a housing enclosing a sealed volume; an audio transducer disposed in the sealed volume; a driver circuit disposed in the sealed volume that selectively drives the audio transducer in either a single ended mode or a double ended mode responsive to an enable signal; control circuitry disposed in the sealed volume that includes a personal area network (PAN) interface and a clock signal source that produces a clock signal, and which applies the clock signal and enable signal to the driver circuit responsive to receiving an alert message at the PAN interface, wherein the enable signal is controlled to have a state that is on, off, or alternating based on an audio profile used responsive to receiving the alert message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A wearable alert device, comprising:
-
an audio transducer comprising a first terminal an a second terminal; a driver circuit disposed in the sealed volume that selectively drives the audio transducer in either a single ended mode or a double ended mode responsive to an enable signal; an audio driver circuit comprising; a first driver logic path that outputs a first drive signal to the first terminal of the audio transducer and that corresponds to an input clock signal provided to the first driver logic path; and a second driver logic path that outputs a second drive signal to the second terminal of the audio transducer and that is responsive to an enable signal to output the second drive signal as a constant output when the enable signal is in a first state and to output the second drive signal as an inverted signal that is an inverted version of the first drive signal when the enable signal is in a second state. - View Dependent Claims (10, 11, 12, 13, 14)
-
-
15. A method of driving an audio transducer in an alert device, comprising:
-
detecting an occurrence of an alert event by the alert device; responsive to detecting the occurrence of the alert event, determining a drive mode for driving the audio transducer, wherein the drive mode is one of a single ended mode and a double ended mode; responsive to determining that the drive mode is the single ended mode, driving the audio transducer using the single ended mode; and responsive to determining that the drive mode is the double ended mode, driving the audio transducer using the double ended mode. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification