## Technical memorandum, Volume 63Dept. of Engineering Science and Applied Physics, Acoustic Research Laboratory, Harvard University, 1970 - Education |

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amplitude arbitrary assume assumptions Audio Eng average axis calculate Chapter cm/s contact area coordinate system critical wavelength deformation force depends Dimensionless effective scanning aperture envelope equation estimate factor force law Fourier transform frequency response func function H groove deformation groove impedance groove velocity groove wall hardness function intersection point J.G. Woodward linear M(tQ measured modulated groove nonlinear obtained output parameter peak perfect pickup pickup function plastic flow playback distortion power series predistortion q(tQ radius record reliable theory scanned modulation scanning effects scanning function scanning loss scanning operation scanning-loss second-order shown in Fig sine wave sliding friction smoothing star-scanned modulation starred system stylus displacement stylus impedance stylus vibrations stylus-groove contact stylus-groove resonance tion tracing error tracing theory tracking force transducer transfer function two-port network u-z PLANE ulation unmodulated unsmoothed scanning values vertical wavelength weighting function width Woodward's data zero-order Zg(f