Browse Prior Art Database

Distribution of Tones

IP.com Disclosure Number: IPCOM000073696D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Colas, JD: AUTHOR [+2]

Abstract

This is a method to control the working of "tone senders", i.e. switches connecting continuous tone generators to lines receiving a tone signal and cutting those continuous tones into pulses satisfying a required cadence. For each type of modulation there is associated a Modulation table defining the sequence of SET and RESET orders to be given to tone senders and a Direct Control Channel (DCC) table registering the list of the tone senders which have to receive these orders. At regular intervals, each Modulation table is read in order to determine the step reached for the type of modulation corresponding to this table and the order corresponding to this step is transmitted to the tone senders defined by the associated DCC table.

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Distribution of Tones

This is a method to control the working of "tone senders", i.e. switches connecting continuous tone generators to lines receiving a tone signal and cutting those continuous tones into pulses satisfying a required cadence. For each type of modulation there is associated a Modulation table defining the sequence of SET and RESET orders to be given to tone senders and a Direct Control Channel (DCC) table registering the list of the tone senders which have to receive these orders. At regular intervals, each Modulation table is read in order to determine the step reached for the type of modulation corresponding to this table and the order corresponding to this step is transmitted to the tone senders defined by the associated DCC table.

The Modulation tables and the DCC tables are parts of a general memory which also contains a Type of Modulation table, storing the address of the Modulation Tables. A tone distribution program is periodically called (for example once very 200 milliseconds). At each call, a pointer A, points to each address in the Type of Modulation table. For each Modulation table the routine advances a pointer B associated with this table. If the next position is "END OF TABLE", pointer B immediately points to the first step position, so as to assure a cyclical operation.

Each step position contains an order: SET, RESET, or NON OPERATION. If the indicated action is SET, the DCC table associated with the Modulation table indicates w...