Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-07-18
1980-01-15
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
325 38B, G06F 506
Patent
active
041841506
ABSTRACT:
This circuit arrangement, which is connected to a delta modulation encoder operating with a sampling rate F and producing a first delta modulation signal, comprises means for producing the two bits b.sub.2n-1, b.sub.2n-2 which in this first signal precede each of the bits b.sub.2n occurring at the instants 2nT and having a rate F/2, a first flip-flop which is controlled at said instants 2nT for maintaining or not maintaining the state thereof, depending on whether the two above-mentioned bits b.sub.2n-1, and b.sub.2n-2 are identical or not, a second flip-flop to which the output signal of the first flip-flop is applied through a logic circuit, and which assumes either the state of the above-mentioned bit b.sub.2n or the state of the bit b.sub.2n-1, depending on whether the first flip-flop is in the one or in the other state. The output of this second flip-flop produces the desired delta modulation signal.
REFERENCES:
patent: 3766542 (1973-10-01), Tomozawa
patent: 3930121 (1975-12-01), Mathiesen
patent: 3937897 (1976-02-01), Song
patent: 4002981 (1977-01-01), Eggermont
Breant Pierre L. V.
Ferrieu Gilbert M. M.
Briody Thomas A.
Goodman Edward W.
Miller Charles D.
Streeter William J.
Telecommunications Radioelectriques et Telephoniques TRT
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