| 摘要 |
A low power transmitter providing selectable waveforms includes a self-contained power source, such as a battery. A timer powered by the battery provides a transmitter actuation signal after a predetermined delay. A voltage regulator coupled to the power source and to the timer provides power in response to the transmitter actuation signal. A waveform generator coupled to the voltage regulator provides one or more selected continuous or pulse waveforms when power is supplied by the voltage regulator. The waveform generator is pre-programmed with one or more selected continuous or pulse waveforms in digital format. The waveform generator outputs at least one selected waveform selected when power is provided by the voltage regulator. Any waveform may be selected by appropriately programming the waveform generator. Signal conditioners, coupled to the waveform generator and the voltage regulator, convert the one or more selected waveforms that are output in unfiltered analog format by the waveform generator into corresponding waveforms in analog format. An amplifier, coupled to the voltage regulator and to the signal conditioners, amplifies the one or more selected waveforms in analog format when power is provided by the voltage regulator. A transducer is coupled to the amplifier for acoustically radiating the selected waveforms in analog format in a marine environment.
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