Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1980-05-12
1982-05-04
Canney, Vincent P.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369128, 324 60CD, 333124, 333 17M, G11B 2736
Patent
active
043285732
ABSTRACT:
A phonograph cartridge interface which enables any magnetic phonograph cartridge to be operated into its proper termination impedance. One embodiment of the device includes a capacitance test section which is used to determine the unknown capacitance of a tonearm cable. A termination network is then adjusted to provide a proper amount of capacitance in view of the determined capacitance and the value of total termination capacitance specified by the cartridge manufacturer. The network also is adjustable to provide the proper termination resistance in parallel with the capacitance.
In a second embodiment capacitance matching circuitry is included which enables the total termination capacitance provided by the tonearm cable and termination network to be adjusted to a desired value. In this embodiment, actual measurement of the tonearm cable capacitance is not required.
Either embodiment of the invention can be (a) configured as a stand-alone device for use with any phono preamplifier or (b) incorporates as an integral part of a phono preamplifier. An isolation amplifier is included in the stand-along version to eliminate effects of the input capacitance of the phono preamplifier to which the interface is connected.
REFERENCES:
patent: 2279500 (1942-04-01), Severin
patent: 2539674 (1951-01-01), Rhoads
patent: 3534180 (1970-10-01), Grout
patent: 3824459 (1974-07-01), Uchida
patent: 4001676 (1977-01-01), Hile
patent: 4065715 (1977-12-01), Jaffe
patent: 4103225 (1978-07-01), Stephens
patent: 4187460 (1980-02-01), Dauge
Kelm Edward
Kurtin Stephen
Canney Vincent P.
Faber Alan
NAD International
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