Dynamic information storage or retrieval – Specific detail of information handling portion of system – Mechanical modification or sensing of storage medium
Patent
1979-04-26
1982-01-19
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Mechanical modification or sensing of storage medium
369 88, 330302, G11B 300, G11B 374, H03F 304
Patent
active
043120601
ABSTRACT:
The preamplifier has a first stage or section of low or unity gain, such as an emitter-follower circuit, which also isolates the preamplifier from impedance variations of the cartridge, and with a bandwidth for greater than the audio range to reproduce signals with a very high amplitude, rapidly changing wavefront without slew or amplitude overload distortion. A RIAA high frequency de-emphasis network is coupled between this first stage or section and a second amplifier section. A RIAA low frequency emphasis network is preferably placed in a negative feedback circuit of the latter amplifier section where the feedback circuit does not contain the high frequency components filtered out by the high frequency de-emphasis network. The second amplifier section need not have the bandwidth of the first amplifier stage or section.
REFERENCES:
patent: 3718857 (1973-02-01), Bernard
Electronic World, vol. 73, No. 3, Mar. 1965, p. 76: TK 6540 R623, "Ceramic Cartridge Phon Preamplifier".
Raytheon Technical Information Bulletin, TIS 117-T, May 1959: "Transistorized Preamplifiers", Starko.
Transient Distortion in Transistorized Audio Power Amplifiers, IEEE Transactions on Audio and Electroacoustic, vol. AU-18, No. 3, Sep. 1970, Otala, pp. 234-239.
Suppression of Slew-Rate and Transient Intermodulation Distortions in Audio Power Amplifiers, Journal of the Audio Engineering Society, vol. 25, No. 7/8, Jul./Aug. 1977, pp. 466-473, Leach, Jr.
SAE-Schematic for Amplifier Model No. 5534.
Phonograph Preamplifier Design Criteria Arising From System Measurements, by Holeman and Kampmann, Paper Presented to the Audio Engr. Society 1977 Convention.
Journal of Audio Engineering Society, vol. 20, No. 5, Jun. 1972, pp. 396-399.
Handbook of Basic Transistor Circuits and Measurements: Educational Services, Inc., .COPYRGT. 1966, pp. 14-15, 34-35.
New Factors in Phonograph Preamplifier Design, Holman: Journal of the Audio Engineering Society, May 1976, vol. 24, No. 4, pp. 263-270.
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