Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-09-29
1982-04-06
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, 375 26, H03K 1302
Patent
active
043238858
ABSTRACT:
A reduction in idle channel noise and crosstalk in a mid-riser-biased successive approximation encoder is achieved through the use of two polarity decisions. Encoder (401) assigns a sampled analog input signal to the closest one of a multitude of discrete signal levels or code steps. A comparator (109) provides this assignment by successive comparisons of the sampled signal with a series of reference signals (110). Each comparison produces a binary digit. The first comparison, or polarity decision, is not transmitted and instead coupled to feedback circuitry (401) to reduce any dc component in the analog input signal to substantially zero. A second polarity decision is then made using a non-zero offset reference signal (402) corresponding to an intermediate position on a code step, typically the midpoint. The non-zero offset reference signal is applied along with subsequent reference signals to the comparator to determine the closest code step. The binary digit from the second polarity decision, along with the binary digits representing the code step, are coupled to the encoder output. Accordingly, the encoder is now biased at the intermediate position to substantially reduce the likelihood of idle channel noise and crosstalk enhancement.
REFERENCES:
patent: 3646586 (1972-02-01), Kurz
patent: 3735392 (1973-05-01), Kaneko
patent: 4151516 (1979-04-01), O'Neill
patent: 4193066 (1980-03-01), Morrison
By Bell Telephone Lab. Staff, "Transmission Systems for Communications", Dec. 1971, pp. 583-585.
Carriere Joseph F.
Gaunt, Jr. Wilmer B.
Landry Joseph E.
Spires Dewayne A.
Bell Telephone Laboratories Incorporated
Miller Charles D.
Padnes David R.
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