A Theory of Scanning Loss in Phonographs

White JV. A Theory of Scanning Loss in Phonographs. J Audio Eng Soc. 1973;21(2):94-102. Available from: https://aes.org/publications/elibrary-page/?id=2005

@article{White1973_2005,
  author = {White, James V.},
  title = {{A Theory of Scanning Loss in Phonographs}},
  journal = {Journal of the Audio Engineering Society},
  volume = {21},
  number = {2},
  pages = {94--102},
  year = {1973},
  month = mar,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=2005}
}

TY  - JOUR
TI  - A Theory of Scanning Loss in Phonographs
AU  - White, James V.
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 21
IS  - 2
SP  - 94
EP  - 102
PY  - 1973
DA  - 1973/03/06
UR  - https://aes.org/publications/elibrary-page/?id=2005
PB  - Audio Engineering Society
LA  - en
AB  - Scanning loss is defined as that component of the total mechanical playback loss which is independent of the driving-point impedance of the stylus. A phenomenological theory of this loss is developed to account for the main features in scanning-loss data obtained by J. G. Woodward. The theory in its simplest form states that the magnitude of the scanning loss as a function of recorded wavelength depends on three parameters: (1) width w of the stylus-groove contact region, which determines the frequencies of the dips in scanning-loss data; (2) an asymmetry parameter a that measures a component of asymmetry in the stylus-groove interaction, which determines the depths of thses dips; and (3) an envelope frequency f that measures the extent to which the groove deformation permits approaching parts of the groove modulation to influence the stylus motion before this modulation actually touches the stylus, which determines the envelope of scanning-loss data. Direct verification of the theory will be possible when measurements of the phase responses of phonographs become available.
ER  -