Ultrasonic transmitter, ultrasonic transceiver and sonar apparatus
First Claim
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1. An ultrasonic transmitter comprising:
- a transducer having a plurality of transducer elements, each transducer element being associated with a separate channel, arranged on a surface of the transducer; and
a transmitting beamformer which provides commands to generate carrier drive signals for forming an ultrasonic transmitting beam by driving the multiple transducer elements with the carrier drive signals;
wherein said transmitting beamformer generates a control signal, for each channel, for controlling pulse durations of a reference signal to generate a carrier drive signal, further wherein the control signal is based upon at least one channel dependent parameter.
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Abstract
An ultrasonic transmitter generates a reference signal based on a clock signal of a specific frequency and a control signal made up of binary values 0 and 1 for controlling how the level (High or Low) of a carrier drive signal should change, and generates an analog signal constituting the carrier drive signal by pulse-duration-modulating the reference signal. Produced from the carrier drive signal, a driving pulse signal is shaped into a curved waveform having a gradually rising leading edge and a gradually falling trailing edge as the amplitude of the carrier drive signal is gradually increased and decreased based on the control signal.
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11 Claims
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1. An ultrasonic transmitter comprising:
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a transducer having a plurality of transducer elements, each transducer element being associated with a separate channel, arranged on a surface of the transducer; and a transmitting beamformer which provides commands to generate carrier drive signals for forming an ultrasonic transmitting beam by driving the multiple transducer elements with the carrier drive signals; wherein said transmitting beamformer generates a control signal, for each channel, for controlling pulse durations of a reference signal to generate a carrier drive signal, further wherein the control signal is based upon at least one channel dependent parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification