Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-12-05
1985-04-23
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, 340347C, 340347M, 370 7, 375 30, H03K 1302
Patent
active
045132798
ABSTRACT:
An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch means cyclically connects C2 between ground and either ground or a reference voltage, and across C1 for providing an indication on C2 of the step offset in a prescribed segment; cyclically connects C3 between ground and the reference voltage and across C1 for stepping through segments below the prescribed segments; transfers all of the charge on C2 to C1 for the prescribed segment; and alternately connects opposite sides of C3 to ground and across C1 for segments above the prescribed segment for redistributing charge on the capacitors and producing an analog signal sample on C1. In an alternate embodiment for satisfying the A-law, all charge on C3 is transferred to C1 for only a first segment that is below the prescribed segment.
REFERENCES:
patent: 3541446 (1970-11-01), Prozeller
Haque et al., A Two-Chip PCM Voice Codec with Filters, IEEE Journal of Solid State Circuits, vol. SC-14, No. 6, pp. 961-969, 12/1979.
Caves et al., A PCM Voice Codec with On-Chip Filters, IEEE Journal of Solid State Circuits, vol. SC-14, No. 1, 2/1979, pp. 65-73.
Gray et al., A Segmented Mu-255 Law PCM Encoder, IEEE Journal of Solid State Circuits, vol. SC-11, No. 6, 12/1976, pp. 740-747.
Kaneko, A Unified Formulation of Segment Companding Laws, The Bell System Technical Journal, 9/1970, pp. 1555-1588.
Cannon Russell A.
GTE Communications Products Corporation
Sloyan T. J.
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