| 摘要 |
A system forming a digitized representation of an analog signal ranging over a wide DB range which incorporates a pre-amplifier, a post amplifier, and digitizer. The digitizer is limited to a maximum input voltage. The amplifier circuitry connected to the digitizer is switched in gain level to precondition the signal for the digitizer. A gain control circuit for the amplifier forms a digitized value representative of system gain. The output of the system is a floating point representation of the analog signal having a sign bit, a digitized mantissa, and a gain level code in digital form.
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