The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 350
he output passing through thetelephone receiver. A receiving circuit that is commonly used and in which thebattery Eg is replaced by a condenser, will be discussed later on.(Section 103.) It will be apparent that the reason why equation (19) con-tains a term having the same frequency ^ that is used… … Fig. 195. form C sin -pt sin qt, simple trigonometry will show that the onlyaudio component of the current in the output of the detector isone which has double the modulating frequency, the audiodetecting current being given by: /d = C2sin2 2J«sin2g^, (20) which on evaluating and dropping inaudible…
Telegraph, Wireless
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