Abstract
The group delay characteristic of pneumatic transmission lines has been investigated to present a transmission distortion in digital signals and PWM wave signals.
In these signals, interesting information is usually contained in the waveforms rather than in the magnitudes. Therefore, it is important to avoid waveform distortions in pneumatic transmission lines. To estimate the waveform distortions, the group delay transmission characteristic is used for the reasons shown below:
(1) Waveform distortions are estimated in the frequency domain.
(2) Waveform distortions correspond to group delay distortions.
Then, the most desirable transmission line has a flat group delay characteristic.
In this paper, a formula describing a condition of the flat group delay characteristic is theoretically proposed with non-dimensional parameters, and experimentally examined
