Multiplex communications – Wide area network – Packet switching
Patent
1983-07-07
1985-10-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
381107, H04J 302
Patent
active
045504008
ABSTRACT:
The remote digital volume control system (10) as used in an audio control apparatus comprising at least one multidigital/audio slot bus (12) which is coupled to base stations through interfaces (21-24). Console interfacing circuits (38) are coupled to the bus (12) and a plurality of remote consoles (30) each with channel control panels (32) coupled to the interfacing circuits (38). The system (10) comprises channel control modules (102) and shared A/D circuitry (150) including two comparators (152, 153) and an up/down counter (154) for generating a four-bit word for each volume control setting of each channel control module (102). The remoted interfacing circuits (38) coupled to said bus include a RAM (180) for storing volume level information for each channel control module (102) and routing information, and a timing control circuit (182) for routing information from the respective digital/audio slots on the bus (12) to audio line driver circuits (71-74) in the consoles (30). The remoted interfacing circuits (38) are controlled by the RAM (180), the timing control circuit (182), and a microprocessor (36) which cause appropriate digital/audio slot information to be converted to an analog signal, muted to the desired level, and routed to a desired audio line driver circuit (71-74) coupled to a speaker (91-94) in a desired console (30).
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PMI Data Book on Application Note 37 Eight Channel Codec Demonstrator by B. W. Berry, pp. 15-167.
Henderson, Jr. James A.
Tennant Chris B.
Motorola Inc.
Olms Douglas W.
Roney Edward M.
Scutch III Frank M.
Southard Donald B.
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