Tone control system for a time division switching system

Claim 2

In a time division switching system, means for assigning each call served by said system to a unique time slot in a repetitively recurring series of time slots, a tone generator, means effective upon each occurrence of a slot for applying to said tone generator a call status word representing the current call serving state of said slot, a time division bus, and means responsive to the reception of each status word by said generator for applying a service tone from said generator to said bus whenever said word represents a call state that requires the application of a tone.

Claim 3

In a time division switching system, means for assigning each call served by said system to a unique time slot in a repetitively recurring series of time slots, a tone generator, means effective upon each occurrence of a slot for applying to said tone generator a call status word representing the current call serving state of said slot, a time division bus, and means responsive to the reception of each status word by said generator for applying a service tone from said generator to said bus whenever said word represents a call state that requires the application of a tone.

Claim 4

In a time division switching system, means for assigning each call served by said system to a unique time slot in a repetitively recurring series of time slots, a tone generator, means effective upon each occurrence of a slot for applying to said tone generator a call status word representing the current call serving state of said slot, a time division bus, and means responsive to the reception of each status word by said generator for applying a service tone from said generator to said bus whenever said word represents a call state that requires the application of a tone.

Claim 5

applying each received status word to a logic circuit in said generator,

Claim 6

applying each received status word to a logic circuit in said generator,

Claim 7

generating a repetitively recurring series of time slots,

Claim 8

generating a repetitively recurring series of time slots,

Claim 9

decoding each status word received by said generator to determine the call state represented by said word,

Claim 10

decoding each status word received by said generator to determine the call state represented by said word,

Claim 11

assigning each call served by said system to a unique time slot in a repetitively recurring series of time slots,

Claim 12

assigning each call served by said system to a unique time slot in a repetitively recurring series of time slots,

Claim 13

applying to a tone generator upon each occurrence of a slot a call status word representing the current call serving state of said slot,

Claim 14

applying to a tone generator upon each occurrence of a slot a call status word representing the current call serving state of said slot,

Claim 15

applying a service tone to said time division bus whenever a received status word represents a call state that requires the application of a tone, and

Claim 16

applying a service tone to said time division bus whenever a received status word represents a call state that requires the application of a tone, and

Claim 17

assigning each call served by said system to a unique slot in said series,

Claim 18

assigning each call served by said system to a unique slot in said series,

Claim 19

controlling the closure of a normally open line switch to connect an output of said generator with said time division bus upon each reception by said logic circuit of a status word requiring the application of a tone,

Claim 20

controlling the closure of a normally open line switch to connect an output of said generator with said time division bus upon each reception by said logic circuit of a status word requiring the application of a tone,

Claim 21

The system of claim 1 in which said tone generator comprises, means for decoding each received status word to determine the call state represented by said word, means responsive to said decoding for applying a service tone to said bus whenever said word represents a call state that requires the application of a tone, and means including said means for decoding for removing said tone from said bus upon the termination of the reception of said status word by said generator.

Claim 22

The system of claim 1 in which said tone generator comprises, a normally open line switch, a plurality of tone sources, a logic circuit responsive to the reception by said generator of each status word requiring the application of a tone for closing said line switch to connect said generator to said time division bus, means for decoding each received word requiring the application of a tone to identify the one of said plurality of said sources that is to be applied, and means controlled by said decoding means for connecting said identified tone source signalwise to said bus via said closed line switch.

Claim 23

applying a priming signal to the input of a decoder from said logic circuit upon each reception by said generator of a status word requiring the application of a tone,

Claim 24

applying a priming signal to the input of a decoder from said logic circuit upon each reception by said generator of a status word requiring the application of a tone,

Claim 25

entering into a memory word location unique to and assigned to each slot of said series a status word comprising information indicating the current call serving state of the slot to which each location is assigned as well as information indicating the current state of any call currently assigned to said slot,

Claim 26

entering into a memory word location unique to and assigned to each slot of said series a status word comprising information indicating the current call serving state of the slot to which each location is assigned as well as information indicating the current state of any call currently assigned to said slot,

Claim 27

removing said tone from said bus upon the termination of the reception of said status word by said generator.

Claim 28

removing said tone from said bus upon the termination of the reception of said status word by said generator.

Claim 29

applying a service tone from said generator to a time division bus of said system whenever a received status word represents a call state that requires the application of a tone to said bus.

Claim 30

applying a service tone from said generator to a time division bus of said system whenever a received status word represents a call state that requires the application of a tone to said bus.

Claim 31

reading said memory upon each occurrence of a slot to apply to an output bus the status word currently stored in said location assigned to said slot,

Claim 32

reading said memory upon each occurrence of a slot to apply to an output bus the status word currently stored in said location assigned to said slot,

Claim 33

applying each received status word to said decoder to specify which one of a plurality of tone sources comprising said generator is to be applied to said time division bus,

Claim 34

applying each received status word to said decoder to specify which one of a plurality of tone sources comprising said generator is to be applied to said time division bus,

Claim 35

In a time division switching system, means for generating a repetitively recurring series of time slots, means for assigning each call served by said system to a unique slot in said series, a memory having a word location unique to and assigned to each slot of said series, means for storing in each word location a status word comprising information indicating the current call serving state of the slot to which said location is assigned, said status word information also indicating the current state of any call currently assigned to the slot to which said location is assigned, a memory output bus, means effective upon each occurrence of a slot for applying from said memory to said bus the status word currently stored in the location assigned to said slot, system control means, means for periodically applying said status word from said output bus to said control means to control the serving of said call by said system including the processing of information signals for said call, a tone generator, means effective upon each occurrence of a slot for applying from said output bus to said tone generator the call status word currently stored in the location assigned to said slot, a time division bus, and means responsive to the reception of each status word by said generator for applying a call service tone to said time division bus whenever said word represents a call state that requires the application of said tone to said bus.

Claim 36

In a time division switching system, means for generating a repetitively recurring series of time slots, means for assigning each call served by said system to a unique slot in said series, a memory having a word location unique to and assigned to each slot of said series, means for storing in each word location a status word comprising information indicating the current call serving state of the slot to which said location is assigned, said status word information also indicating the current state of any call currently assigned to the slot to which said location is assigned, a memory output bus, means effective upon each occurrence of a slot for applying from said memory to said bus the status word currently stored in the location assigned to said slot, system control means, means for periodically applying said status word from said output bus to said control means to control the serving of said call by said system including the processing of information signals for said call, a tone generator, means effective upon each occurrence of a slot for applying from said output bus to said tone generator the call status word currently stored in the location assigned to said slot, a time division bus, and means responsive to the reception of each status word by said generator for applying a call service tone to said time division bus whenever said word represents a call state that requires the application of said tone to said bus.

Claim 37

applying said specified one tone source to said time division bus via said generator output and said closed line switch under the control of the status word and said priming signal received by said decoder.

Claim 38

applying said specified one tone source to said time division bus via said generator output and said closed line switch under the control of the status word and said priming signal received by said decoder.

Claim 39

periodically extending the status word applied to said output bus to a system control means for controlling the serving of calls by said system including the processing of call information signals,

Claim 40

periodically extending the status word applied to said output bus to a system control means for controlling the serving of calls by said system including the processing of call information signals,

Claim 41

The system of claim 4 in which said tone generator comprises, means for decoding each received status word to determine the call state represented by said word, means responsive to said decoding for applying a service tone to said time division bus whenever said word represents a call state that requires the application of a tone to said time division bus, and means including said means for decoding for removing said tone from said bus upon the termination of the reception of said status word by said generator.

Claim 42

The system of claim 4 in which said tone generator comprises, a normally open line switch having a first side connected to said time division bus and a second side connected to an output of said generator, a plurality of tone sources, a decoder, a logic circuit responsive to the reception by said generator of each status word requiring the application of a tone for closing said line switch to connect the output of said generator to said time division bus, means for decoding each received word requiring the application of a tone to identify the one of said plurality of said sources that is to be applied, and means controlled by said decoder for connecting said identified tone source signalwise to said bus via said output and said closed line switch.

Claim 43

applying each status word read out of said memory upon each occurrence of a slot to a tone generator,

Claim 44

applying each status word read out of said memory upon each occurrence of a slot to a tone generator,

Claim 45

controlling said generator upon the reception of each word for applying a service tone to a time division bus whenever said received word represents a call state that requires the application of a tone to said time division bus.

Claim 46

controlling said generator upon the reception of each word for applying a service tone to a time division bus whenever said received word represents a call state that requires the application of a tone to said time division bus.

Claim 47

The system of claim 6 wherein each status word comprises a plurality of bit orders, wherein said logic circuit is responsive to a first combination of the plurality bit orders comprising said status word and wherein said decoder is responsive to remainder of the bit orders comprising said status word, said system further comprising means controlled by said logic circuit upon the reception of each status word requiring the application of a tone for applying an enable signal to said decoder, said decoder being responsive to the reception of status words to identify one of said tone sources only when an enable signal is received from said logic circuit.

Claim 50

The method of claim 8 in which said last step comprises the means of,