Hemingway Audio

Schematic Figures about Hemingwayaudio

Fig.1 A propagating electromagnetic wave. The sinusoidally varying magnetic field is at right angles to the sinusoidally varying electric field, and both are at right angles to the direction of propagation.

Fig.2 Approximate relationship of propagating field E-Bar to loss field B-Barσ. B-Barσ is sinusoidal and is shown at 100Hz, 1kHz, and 10kHz for a conductor of width 10mm.

Fig.3 Cross-section of coaxial cable showing radial E-Bar field and circumferential H-Bar field.

Fig.4 Basic field relationships and direction of propagation of main external field and internal loss field.

Fig.5 Measurement system for extracting error signal due to internal loss field within a conductor exhibiting significant "skin" depth.

Fig.6 shows a computer simulation of a tone burst that has been modified by a transfer function similar to that occurring in the cable. A similar measured result is shown in fig.7. In the steady state, a 45° phase shift occurs. However, after the tone is switched off a dispersive component is revealed. This latter period is where the energy contained within the conductors decays and is constrained by the low velocity of propagation within a good conductor.

Fig.6 Predicted error due to internal loss field of conductor operating in skin depth-limited region.

Fig.7 Measured error due to internal loss field of conductor operating in skin depth-limited region. Note that input and output waveforms are not on the same scale, and that time dispersion is proportional to the tone period in the skin depth-limited region, meaning that the time scale is immaterial.