Depth meter having improved time varying gain control专利检索-仪表放大器差分放大器电子零件及设备专利检索查询-专利查询网

Depth meter having improved time varying gain control

阅读：704发布：2022-05-23

专利汇可以提供Depth meter having improved time varying gain control专利检索，专利查询，专利分析的服务。并且This invention relates to a meter for indicating the depth of water. More particularly, the invention provides a depth meter having a transducer means for imparting sound pulses near the surface of a body of water in response to electrical energization and in turn for providing electrical signal output in response to reflected sound pulses, a time base circuit providing evenly spaced systems initiating signals, an oscillator circuit providing sequential bursts of electrical energy to the transducer, in response to the system initiating signals, a receiving amplifier connected to the transducer amplifying the reflected signal output in response to reflected sound waves, a metering circuit connected to the time base circuit and the amplifier providing means of indicating the time response between the transmitted signal and the signal received in response to receipt of sound waves as an indication of the distance to the bottom of the body of water reflecting the sound waves from the transducer and a time varying gain control circuit connected to the time base circuit and receiver amplifier providing a time varying bias to the amplifier following each system initiating signal, the bias being applied to the amplifier with time whereby signals resulting from the bottom at greater distances from the transducer are amplified more than signals resulting from shallower depths.，下面是Depth meter having improved time varying gain control专利的具体信息内容。

权利要求

1. An improved depth sounder for detecting the depth of objects under the water comprising: a transducer for imparting sound pulses in response to electrical energization and in turn for providing an electrical signal output in response to reflected sound pulses; a resonant tank circuit having a transducer output-input connected to said transducer, a transmitting signal input, and a signal output; a voltage source having a positive pole and a negative pole; a time base circuit having a first, a second and a third NPN transistor each having a base, a collector and an emitter, the base of the first transistor being connected to the collector of the second transistor through a resistor, and the base of the second transistor being connected to the collector of the third transistor, the emitter of the first and second transistors being connected to the negative pole of said voltage source through a common resistor, the collectors of the first and second transistors being connected to the positive pole of said voltage source through separate resistors, the collector of the first transistor being connected to the base of the third transistor through a resistor, a capacitor connected across the collector-emitter junction of the third transistor, the emitter of the third transistor being connected to said voltage source negative pole and a resistor being connected between the third transistor base and said voltage source negative pole, the voltage signal appearing at the collector of said first transistor providing timing voltage signal of preselected pulse frequency, each pulse being of a preselected duration and the voltage signal appearing at the collector of the third transistor providing a ramp gain control signal at the same frequency as the timing voltage pulses; an oscillator circuit having an input connected to receive said time base circuit timing voltage signal and an output, the oscillator circuit providing time spaced bursts of electrical energy in response to energization by said time base circuit, the output of the oscillator circuit being connected to said resonAnt tank circuit transmitting signal input; a receiver amplifier circuit having an input, an output and a biasing signal input, the output of the amplifier being connected to said resonant tank circuit signal output; a metering circuit having a first input, a second input, the first input of the metering circuit being connected to said time base circuit output whereby each of said time spaced voltage pulses of said time base circuit initiates a measuring sequence in the metering circuit, the second input of the metering circuit being connected to said amplifier circuit output whereby signals received from said amplifier circuit in response to amplified signals generated by said transducer in response to receipt of sound pulses as an indication of the distance to the surface reflecting the sound pulses from said transducer, said amplifier circuit connected to receive said time base circuit gain control signal whereby said amplifier circuit has impressed thereon a time varying biasing voltage following each timing voltage signal pulse, such biasing voltage applied to said amplifier circuit serving to increase the amplification of said amplifier circuit with time whereby the signals resulting from reflective surfaces at greater distances from said transducer are amplified more than signals resulting from closer reflective surfaces.

2. An improved depth sounder according to claim 6 including: a second receiver amplifier circuit having an input and an output, the input being connected to said first mentioned receiver amplifier circuit and the output being connected to said metering circuit providing two stages of amplification between said transducer means and said metering circuit; and a manual gain control in said second receiver amplifier circuit providing a two stage amplifier arrangement having a manual gain control and a time varying automatic gain control superimposed thereon.

3. An improved depth sounder according to claim 6 including: a detector circuit having an input and an output, the input being connected to said receiver amplifier circuit and the output connected to said metering circuit, the detector circuit providing means of detecting the occurrence of reflected sound pulses by said transducer means and actuating said metering circuit in response thereto.

4. An improved depth sounder according to claim 6 wherein said metering circuit includes a bi-stable multivibrator circuit, the transmitted signal from said oscillator circuit serving to set the multivibrator circuit in one of two stable states and the returning echo received by said transducer means and amplified by said receiver amplifier circuit serving to trigger the multivibrator circuit to the other of the stable states; and including a meter connected to measure average current flow occurring during one of the stable states of said multivibrator.

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Depth meter having improved time varying gain control

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