Telephonic communications – Subscriber line or transmission line interface – For line length compensation
Patent
1984-04-10
1987-06-16
Rubinson, Gene Z.
Telephonic communications
Subscriber line or transmission line interface
For line length compensation
379338, 379340, 379399, H04B 300
Patent
active
046741194
ABSTRACT:
A wide band high voltage and high power amplifier is particularly useful for telephony applications. The amplifier employs a flyback converter with the capacitor storage element coupled across the line. The subscriber line is characterized in having a definite load impedance which impedance is in parallel with the storage capacitor of the flyback converter. The subscriber lines are monitored by a differential amplifier which provides a single-ended output indicative of the levels across the lines. This output is summed with the input signal to develop an error signal. The input signal to the line circuit is the particular signal of concern such as ringing, the voice signal and so on. The error signal is supplied as one input to a comparator having another input coupled to a triangular reference waveform. The output of the comparator provides a pulse width modulated waveform where the width of the pulses are indicative of the error signal. These pulses are applied to a transistor coupled to the primary winding of the transformer associated with the flyback converter to enable flyback operation during the pulse and hence to transfer energy to the storage capacitor as a function of the error signal.
REFERENCES:
patent: 3172019 (1965-03-01), Ragonese
patent: 3334243 (1967-08-01), Cooper
patent: 4059807 (1977-11-01), Hamada
patent: 4071877 (1978-01-01), Stewart et al.
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4306122 (1981-12-01), Nijman et al.
patent: 4315106 (1982-02-01), Chea, Jr.
patent: 4357495 (1982-11-01), Sweet et al.
patent: 4415777 (1983-11-01), Agnew
patent: 4490580 (1984-12-01), Nagashima
patent: 4546421 (1985-10-01), Bello et al.
ITT Corporation
Rubinson Gene Z.
Vaas R.
Van Der Sluys Peter C.
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