StreamSage Unsupervised ASR-Based Topic Segmentation

A new logarithmic conversion system takes advantage of the time domain as an intermediate step in converting an analog input signal into an output signal which is a function of the logarithm of the input signal. A reference signal which varies exponentially as a function of time during each of a succession of time intervals is compared with the input signal. The instant when the two signals are equal divides each period into two portions. During one portion the exponential signal is greater than the input signal and during the other portion the input signal is greater than the exponential signal. The two portions of the time period control the supply of an input to an integrating amplifier, whose output may be made to be a function of either the log of the input signal or the log of one over the input signal. The exponential signals are also used to control the amplifier to provide an output which is a function of the log of the ratio of two input signals.