The theory of fundamental design limitations is well understood for the case that the performance variable is measured for feedback. In the present paper, we extend the theory to systems for which the performance variable is not measured. We consider only the special case for which the performance and measured outputs and the control and exogenous inputs are all scalar signals. The results of t...

A new approach to computer music instruments is described. Rather than sense control parameters from acoustic instruments (or non-acoustic instrument controllers), the sound of an acoustic instrument is used directly by a synthesis algorithm, usually replacing an oscillator. Parameters such as amplitude and pitch can control other aspects of the synthesis. This approach gives the player more co...

the aim of this research was to investigate the ability of arousal control in male and female athletes using mental imagery and biofeedback methods. participants were 30 male and female athlete students of tehran university (mean aged 23) who were assigned into two homogeneous groups based on vividness of movement imagery questionnaire 2. participants were given acoustic biofeedback during thre...

Abstract A low-noise low-pressure ultra-high-bypass-ratio fan stage to be implemented in the next generation of aircraft engines is described and evaluated acoustically with semi-empirical analytical methods suited for preliminary design. As expected, good reduction potentials are observed jet noise tonal components when UHBR design compared current fans service. However, concerns identified br...