Pair Of Output Signals Research Articles

Output-only identification of input–output models

In applications of system identification where the input signal is unknown, transmissibility identification can be used to estimate the operator between a pair of output signals. A limitation of transmissibility identification is the fact that the numerator and denominator of a transmissibility are numerators of the transfer functions from the input to the sensors. Consequently, transmissibility identification does not capture the poles of the system. To overcome this limitation, this paper introduces transmissibility-based system identification (TBSID), which uses estimates of two transmissibilities to identify the complete dynamics from two unmeasured inputs to two measured outputs. The method assumes that the system can be excited nonsimultaneously by two input signals at two distinct locations.

Head related transfer functions for panned stereo audio content

A method to process audio signals, an apparatus accepting audio signals, a carrier medium that carried instructions for a processor to implement the method to process audio signals, and a carrier medium carrying filter data to implement a filter of audio signals. The method includes filtering a pair of audio input signals by a process that produces a pair of output signals corresponding to the results of: filtering each of the input signals with a HRTF filter pair, and adding the HRTF filtered signals. The HRTF filter pair is such that a listener listening to the pair of output signals through headphones experiences sounds from a pair of desired virtual speaker locations. Furthermore, the filtering is such that, in the case that the pair of audio input signals includes a panned signal component, the listener listening to the pair of output signals through headphones is provided with the sensation that the panned signal component emanates from a virtual sound source at a center location between the virtual speaker locations.

Velocity sense detection based on the spatial filter method

A technique for determining the velocity sense using a pair of parallel spatial filters arranged in opposing senses (or using a single differential spatial filter) is proposed. This method is analogous to the relationship between convolutions and correlations. By mapping the relationship into the spatial domain, where the motion occurs, and applying simple signal-processing procedures to the pair of output signals, the velocity sense is detected. The theory behind the spatial filter method is discussed. Results of a computer simulation that verify the usefulness of the technique are presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Reverberator having tapped and recirculating delay lines

A reverberator comprises a tapped delay line (2, 3, 4, 5, 10) connected to an analog audio signal source (1) for deriving therefrom at least one pair of output signals which are respectively delayed by first and second different values with respect to the source signal, the ratio of the first to second values being an irrational number. A recirculating delay line (6, 7, 11, 12) is connected to the output of the tapped delay line having a delay element (63, 73, 113, 123) for introducing an additional delay to the output signals of the tapped delay line and a resistive recirculating path (65, 75, 115, 125) for recirculating the additionally delayed signals through the delay element. The output of the recirculating delay line is combined with the source signal to derive a reverberating audio signal.