Adder circuit for encoded PCM samples

Details Adder circuit for encoded PCM samples Adder circuit for encoded PCM samples

1984-12-31

1987-10-06

Harkcom, Gary V.

Boots, shoes, and leggings

364748, G06F 750, G06F 738

Patent

active

046987711

ABSTRACT:
A circuit adds and subtracts pulse code modulation (PCM) samples in D2 format. An exponent subtractor determines the difference between exponents of the two PCM samples. A mantissa shifter circuit shifts the mantissa portion of a selected PCM sample to compensate for the difference in the exponents. A mantissa adder circuit adds or subtracts the mantissa portion of the shifted and unshifted PCM samples and a sign generator provides a sign value representative of the resultant added or subtracted PCM samples. A normalizer circuit ensures that the mantissa has a predetermined range of values.

REFERENCES:
patent: 4357674 (1982-11-01), Ikeda et al.
patent: 4511990 (1985-04-01), Hagiwara et al.
patent: 4612628 (1986-09-01), Beauchamp et al.
Dauby et al., "Pulse Code Modulation Adder", IBM Technical Disclosure Bulletin, vol. 18, No. 8, pp. 2536-2537, Jan. 1976.

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