Low power audio detection
First Claim
1. A method, performed by a device, of detecting an audio signal of interest in a number of audio signals, the method comprising:
- operating the device in a low power mode having a relatively low power consumption;
detecting, in the low power mode, a probable presence of the audio signal of interest by;
filtering, using a filter bank, the number of audio signals to include only frequencies corresponding to the audio signal of interest;
detecting, using a narrowband signal detector and a wideband signal detector, variations in the filtered audio signals over a narrow bandwidth and a wide bandwidth, respectively; and
comparing, using a pattern comparator, the detected variations in the filtered audio signals with frequency characteristics of a comparison signal; and
switching the device from the low power mode to a normal power mode based on the detected probable presence of the audio signal of interest, the normal power mode having a relatively high power consumption.
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Accused Products
Abstract
Devices and methods of detecting a predetermined audio signal in audio signals are provided. A device includes a processor coupled to a clock signal generator, a power controller and an audio detector. The power controller controls a clock rate provided to the processor by the clock signal generator, to control the device to operate in a low power mode having a relatively low power consumption or in a normal power mode having a relatively high power consumption. The audio detector receives audio signals and detects, in the low power mode, probable presence of a predetermined audio signal in the audio signals. The power controller controls the device to switch from the low power mode to the normal power mode responsive to the detected presence of the predetermined audio signal by the audio detector.
15 Citations
29 Claims
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1. A method, performed by a device, of detecting an audio signal of interest in a number of audio signals, the method comprising:
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operating the device in a low power mode having a relatively low power consumption; detecting, in the low power mode, a probable presence of the audio signal of interest by; filtering, using a filter bank, the number of audio signals to include only frequencies corresponding to the audio signal of interest; detecting, using a narrowband signal detector and a wideband signal detector, variations in the filtered audio signals over a narrow bandwidth and a wide bandwidth, respectively; and comparing, using a pattern comparator, the detected variations in the filtered audio signals with frequency characteristics of a comparison signal; and switching the device from the low power mode to a normal power mode based on the detected probable presence of the audio signal of interest, the normal power mode having a relatively high power consumption. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 26, 27)
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12. A device comprising:
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a processor coupled to a clock signal generator; a power controller configured to operate the device in a low power mode having a relatively low power consumption or in a normal power mode having a relatively high power consumption; and an audio detector, coupled to the power controller, and configured to detect, in the low power mode, a probable presence of an audio signal of interest in a number of audio signals, the audio detector comprising; a filter bank configured to filter the number of audio signals to include only frequencies corresponding to the audio signal of interest; a narrowband signal detector configured to detect variations in the filtered audio signals over a narrow bandwidth; a wideband signal detector configured to detect variations in the filtered audio signals over a wide bandwidth; and a pattern detector configured to compare the detected variations in the filtered audio signals with frequency characteristics of a comparison signal, wherein the power controller is further configured to switch the device from the low power mode to the normal power mode based on the detected probable presence of the audio signal of interest. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 28, 29)
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Specification