Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1977-05-10
1979-09-18
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
84 101, 307310, 340347M, 340347CC, H03K 1302
Patent
active
041684923
ABSTRACT:
A temperature-compensated antilogarithmic converter has a temperature-sensitive signal generator for generating a temperature dependent signal which varies in proportion to absolute temperature; a multiplying means for mixing and converting the temperature dependent signal and an input signal into a product signal; and a non-temperature compensated antilogarithmic amplifier for converting the product signal into a non-temperature compensated antilogarithm of the product signal, wherein by placing the temperature-sensitive element of the temperature-sensitive signal generator and the antilogarithmic element of the antilogarithmic amplifier at the same temperature, the dependance of the antilogarithmic amplifier is temperature compensated by the temperature dependent signal. Thereby, an output converted signal the voltage or current of which is stable with respect to temperature variation can be generated.
REFERENCES:
patent: 3653033 (1972-03-01), Bonami et al.
patent: 3940760 (1976-02-01), Brokaw
patent: 3952624 (1976-04-01), Kawakami
patent: 4015149 (1977-03-01), Tsunekawa et al.
patent: 4063116 (1977-12-01), Schmoock
Clayton, Experiments with Operational Amplifiers; Using Transistors for Logarithmic Conversion, Wireless World, 1/1973, pp. 33-35.
Dobkin, Logarithmic Converters, IEEE Spectrum, 11/1969, pp. 69-72.
Matsushita Electric - Industrial Co., Ltd.
Sloyan Thomas J.
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