Tap sensitive alarm clock
First Claim
1. A tap-sensitive alarm clock, comprising:
- a housing;
a vibration sensor mechanically coupled to the housing for receiving a shock in response to a user tapping on the housing;
a control circuit for controlling a function of the alarm clock in response to said shock;
an audio unit coupled to an audio circuit, said audio circuit being operable to effect production by the audio unit of sound simultaneously with the reception by the vibration sensor of said shock, wherein the shock includes overlapping frequency components that overlap sound frequency components of the sound; and
a filter coupled to the vibration sensor, to the audio circuit, and to the control circuit, the filter having a filter curve matched to filter frequency components that are present in the sound so that only frequency components of the shock that do not overlap the sound frequency components are passed to the control circuit,wherein the filter is automatically adjusted in dependence on audio content of the sound such that the filter curve is changed to remain matched to the filter frequency components that are present in the sound when the audio content of the sound changes and the filter continues to filter the sound to block the sound frequency components and the overlapping frequency components and to pass only the frequency components of the shock that do not overlap the sound frequency components.
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Accused Products
Abstract
A tap sensitive alarm clock has a housing (20), a vibration sensor (22) mechanically coupled to the housing for receiving a shock due to a user tapping the housing, and a control circuit (24) coupled to the vibration sensor for controlling a function of the alarm clock. An audio unit (26) is coupled to an audio circuit (25) for generating sound, e.g. a loudspeaker in an alarm clock or a wake up light. To avoid interference of the sound and the vibration sensor, the alarm clock is provided with a filter (23) coupled to the vibration sensor and the control circuit. The filter has a filter curve matched to block frequencies occurring in the sound. Advantageously it is avoided that the sound frequencies trigger the function, while the sensor is sensitive to other frequencies up to the frequency range of the sound for reliably detecting the tapping.
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Citations
15 Claims
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1. A tap-sensitive alarm clock, comprising:
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a housing; a vibration sensor mechanically coupled to the housing for receiving a shock in response to a user tapping on the housing; a control circuit for controlling a function of the alarm clock in response to said shock; an audio unit coupled to an audio circuit, said audio circuit being operable to effect production by the audio unit of sound simultaneously with the reception by the vibration sensor of said shock, wherein the shock includes overlapping frequency components that overlap sound frequency components of the sound; and a filter coupled to the vibration sensor, to the audio circuit, and to the control circuit, the filter having a filter curve matched to filter frequency components that are present in the sound so that only frequency components of the shock that do not overlap the sound frequency components are passed to the control circuit, wherein the filter is automatically adjusted in dependence on audio content of the sound such that the filter curve is changed to remain matched to the filter frequency components that are present in the sound when the audio content of the sound changes and the filter continues to filter the sound to block the sound frequency components and the overlapping frequency components and to pass only the frequency components of the shock that do not overlap the sound frequency components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification