Having as incident signal the input signal to the system, that is, an acoustic impulse, and as reflected signal, the object's impulse response (reflections); and bearing in mind that the acoustic impedance is the ratio between pressure and volumetric rate, we may relate the impulse response to the impedance, as shown ahead.
2, it can be seen that the input signal is applied to the transistor pair [T.sub.1] and [T.sub.2], and the gain control signal is connected to transistors [T.sub.3], [T.sub.4] and [T.sub.5].
A fibre adaptor for use with the Yokogawa AQ6370 series of optical spectrum analysers (OSAs) is designed to enhance the sensitivity, dynamic range and level stability by reducing the divergence of light emitted from the input fibre and increasing the input signal to the OSA by 5dB.
The operator can turn the EC-E on or off manually using the integrated slide switch or remotely reset the breaker via an input signal. The EC-E series comes in three versions.
The input signal, including noise (white noise) is amplified by an adjustable gain , AC coupled amplifier , in order to match it more closely to the optimum input signal range of the PSD (phase-sensitive detection).