Transfer function

About: Transfer function is a research topic. Over the lifetime, 14362 publications have been published within this topic receiving 214983 citations. The topic is also known as: system function & network function.

Fundamentals of Acoustic Field Theory and Space-Time Signal Processing

Abstract: Part I ACOUSTIC FIELD THEORY: The Linear Wave Equation and Fundamental Acoustical Quantities: Equations of Motion. Equation of Continuity. Equation of State and the Speed of Sound. Derivation of the Linear Wave Equation. Time-Average Intensity Vector and Time-Average Power. Sound-Pressure Level, Source Level, Transmission Loss, and Sound-Intensity Level. Problems. Appendices. Bibliography. Wave Propagation in the Rectangular Coordinate System: Solution of the Linear Three-Dimensional Homogeneous Wave Equation. Free-Space Propagation. Reflection and Transmission Coefficients. The Rectangular Cavity. Waveguide with Rectangular Cross-Sectional Area. The Time-Independent Free-Space Green's Function. Solution of the Linear Three-Dimensional Inhomogeneous Wave Equation with Arbitrary Source Distribution. Integral Representations of the Time-Independent Free-Space Green's Function in Rectangular Coordinates. Problems. Appendices. Bibliography. Wave Propagation in the Cylindrical Coordinate System: Solution of the Linear Three-Dimensional Homogeneous Wave Equation. Free-Space Propagation. The Cylindrical Cavity. Waveguide with Circular Cross-Sectional Area. Scattering by a Cylinder. Integral Representations of the Time-Independent Free-Space Green's Function in Cylindrical Coordinates. Reflection and Transmission of Spherical Waves at Planar Boundaries. Waveguide Models of the Ocean: Normal Modes. Waveguide Model of the Ocean: Full-Wave Solution. Problems. Appendices. Bibliography. Wave Propagation in the Spherical Coordinate System: Solution of the Linear Three-Dimensional Homogeneous Wave Equation. Free-Space Propagation. The Spherical Cavity. Scattering by a Sphere. Problems. Bibliography. Wave Propagation in Inhomogeneous Media: The WKB Approximation. Ray Acoustics. The Parabolic Equation Approximation. Problems. Appendices. Bibliography. Part II SPACE-TIME SIGNAL PROCESSING: Complex Aperture Theory: Coupling Transmitted and Received Electrical Signals to the Fluid Medium. Near-Field and Far-Field Directivity Functions of Volume Apertures. Linear Apertures and Far-Field Directivity Functions. Linear Apertures and Near-Field Directivity Functions. Planar Apertures and Far-Field Directivity Functions. Planar Apertures and Near-Field Directivity Functions. Directivity Index. Problems. Appendix. Bibliography. Array Theory: Linear Arrays and Far-Field Directivity Functions. Linear Arrays and Near-Field Directivity Functions. Array Gain. Planar Arrays and Far-Field Directivity Functions. Planar Arrays and Near-Field Directivity Functions. Volume Arrays and Far-Field Directivity Functions. Problems. Bibliography. Signal Processing: FFT Beamforming for Planar Arrays. Complex Envelopes. The Auto-Ambiguity Function. Time Compression/Stretch Factor, Time Delay, and Doppler Shift Expressions. Problems. Appendix. Bibliography. Fundamentals of Linear, Time-Variant, Space-Variant Filters and the Propagation of Small-Amplitude Acoustic Signals: Impulse Response and Transfer Function. Bifrequency Function. Output Frequency and Angular Spectrum. Coupling Equations and Pulse Propagation. Bibliography. SYMBOLS AND ABBREVIATIONS. INDEX.

Recursive algorithm for computing the frequency response of a class of non-linear difference equation models

Abstract: A recursive algorithm is developed which is both computationally compact and enables the nth-order frequency response functions of a large class of non-linear difference equation models to be found without restriction on the order n.

A multi-path signal propagation model for the powerline channel in the high frequency range

Abstract: For the use of the mains networks as high speed data path for Internet, voice and data services carrier frequencies within the range from 500 kHz up to 20 MHz must be considered. The development of suitable communication systems and the planning of power line communication networks requires measurement-based models of the transfer characteristics of the mains network in the abovementioned frequency range. ' The heterogeneous structure of the mains network with numerous branches and impedance mismatching causes numerous reflections. Besides multi-path propagation with frequency-selective fading, typical power cables exhibit signal attenuation increasing with lengtli and frequency. The complex transfer function of n power line link can be described by a parametric model in the considered frequency range. Measurements of amplitude and phase response of a sample network with well-known geometry approve the validity of the model. Comparisons with measurements conducted at ,,live6' mains networks prove the validity of the model also for real network topologies.

Analog reconstruction circuit and bar code reading apparatus employing same

Abstract: A bar code detection circuit accepts as input the discretized analog output of a CCD array, and performs piecewise linear reconstruction to produces a continuous polylinear output signal. In the region of a bar/space transition, the output signal is a close approximation of the reflectance function of a bar code symbol convolved with the system transfer function of the bar code reader. Linear interpolation is performed in order to determine the offset of a given threshold value from an edge of the CCD analog output.