Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1988-04-21
1990-09-18
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341144, 375 34, H03M 302
Patent
active
049581589
ABSTRACT:
Modem comprising a delta modulation (DM) encoder and a DM decoder which has noise-reducing capability in the demodulation of encoded binary pulse signals representative of constant amplitude signals. The DM decoder includes a 1-click delay circuit operable in conjunction with a logic circuit and an integrator to produce a demodulated output signal which is the same as the preceding signal when the input signals to the DM encoder are constant amplitude signals, thereby eliminating are substantially reducing granular noise arising from a constant analog input to the modem without requiring a special filter. The logic circuit of the DM decoder may be an exclusive NOR gate which compares the 1-clock delayed binary pulse signal with the binary pulse signal and provides a control signal output based upon the comparison. The control signal output from the exclusive NOR gate controls the output of the integrator and enables the integrator to produce a substantially noise-free demodulated output signal.
REFERENCES:
patent: 3292086 (1966-12-01), Magnuski
patent: 4112500 (1978-09-01), Peters
patent: 4544911 (1985-10-01), Altman et al.
patent: 4703308 (1987-10-01), Belcher
Hashizume Motomu
Matsumoto Yukoh
Hiller William E.
Merrett N. Rhys
Sharp Melvin
Shoop Jr. William M.
Texas Instruments Incorporated
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