SIGNAL PROCESSING
First Claim
Patent Images
1. Electronic apparatus comprising:
- a transmitter arranged to transmit an ultrasonic signal;
a receiver arranged to receive a reflection of the ultrasonic signal from an input object, and to generate a received analogue electrical signal therefrom;
a filter arranged to take the received analogue electrical signal as input and to output a filtered analogue electrical signal; and
a digital processor configured to control a characteristic of the filter, and to use the filtered analogue electrical signal to determine a user input to the electronic apparatus.
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Accused Products
Abstract
The disclosed electronic apparatus comprises:
- transmitting means 54 arranged to transmit an ultrasonic signal;
- receiving means 55 arranged to receive a reflection of the ultrasonic signal from an input object, and to generate a received analogue electrical signal therefrom;
- a filter 56 arranged to take the received analogue electrical signal as input and to output a filtered analogue electrical signal; and
- digital processing means 52 configured to control a characteristic of the filter 56, and to use the filtered analogue electrical signal to determine a user input to the electronic apparatus.
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Citations
26 Claims
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1. Electronic apparatus comprising:
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a transmitter arranged to transmit an ultrasonic signal; a receiver arranged to receive a reflection of the ultrasonic signal from an input object, and to generate a received analogue electrical signal therefrom; a filter arranged to take the received analogue electrical signal as input and to output a filtered analogue electrical signal; and a digital processor configured to control a characteristic of the filter, and to use the filtered analogue electrical signal to determine a user input to the electronic apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Electronic apparatus comprising:
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a transmitter arranged to transmit an encoded ultrasonic signal; a receiver arranged to receive a reflection of the ultrasonic signal from an input object, and to generate a received analogue electrical signal therefrom; a filter arranged to take the received analogue electrical signal as input and to output a filtered analogue electrical signal, wherein said filter is adapted so as at least partially to apply pulse-compression to said analog electrical signal; and a digital processor configured to use the filtered analogue electrical signal to determine a user input to the electronic apparatus. - View Dependent Claims (20, 21, 22, 23)
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24. Electronic apparatus comprising:
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a transmitter arranged to transmit an ultrasonic signal; a receiver which receives i) a direct path signal from the transmitting means; and
ii) a reflection of the ultrasonic signal from an input object, and to generate a received analogue electrical signal therefrom;a filter arranged to take the received analogue electrical signal as input and to output a filtered analogue electrical signal, wherein said filter is adapted to reduce a contribution of the direct path signal in the analogue electrical signal relative to a contribution of the reflected signal; and a digital processor configured to use the filtered analogue electrical signal to determine a user input to the electronic apparatus. - View Dependent Claims (25)
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26. A method of determining a user input to an electronic apparatus comprising:
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transmitting an ultrasonic signal; receiving a reflection of the ultrasonic signal from an input object; generating a received analogue electrical signal from the reflection; filtering the received analogue electrical signal in a filter which outputs a filtered analogue electrical signal; and controlling a characteristic of the filter with a digital processing means; and using the digital processing means to determine a user input to the electronic apparatus from the filtered analogue electrical signal.
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Specification