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Plate reverberators with adjustable features - concept of study and test stand

Korytowski Adam, Olszewski Ryszard, Pluta Marek

Vibrations in Physical Systems

2023

Vol. 34, nr 2

art. no. 2023204

Mechanical vibration of plates have applications in many fields of science and industry including synthesis of artificial reverberation - one of the most important signal processors in audio engineering. The paper presents a concept for study and measurements of reverberating plates that contains an initial numerical solution with a goal of predicting behaviours of the vibrating plate as its response for physically affecting its vibration. The concept also considers experimental measurements of selected simplified solutions as well as their comparison with numerical simulation. In addition the paper contains evidence for perceptible differences between audio signals obtained from the initial experiments, which suggests the viability of adjustable mechanical reverberation mechanism. Moreover, the paper includes concept for test stand for experimental study of reverberating plates in order to achieve signals differing in perceptually significant way. The test stand and study will allow to increase knowledge of vibrating plates as parts of plate reverberation devices.

Optimisation of the total harmonic distortions of the acoustic vacuum tube push-pull amplifier

Maleczek S.

Archives of Acoustics

2008

Vol. 33, No. 1

103-109

The study presents the method of reducing total harmonic distortions of the acoustic vacuum tube amplifier with 30 W output power. The optimisation of the amplifier's circuit is carried out by introducing the solutions applied in the transistor technology such as differential amplifiers with a source of a current. Selection of the amplifier vacuum tubes, as well as of their operating points, was studied as a mean to reduce the distortion amount of the whole amplifier stage. By optimising the amplifier it was presented how a simple circuit solution assures very good final parameters with relatively low costs. The measurements were conducted using the Audio Precision systems.