Tone and announcement message code generator for a telephonic switching system and method
First Claim
1. An apparatus for generation tone and announcement message codes for a telephonic switching network, comprising:
- a single message memory for storing a repertoire of PCM encoded tone and announcement messages respectively at a plurality of preselected addressable message memory locations of said message memory;
a multichannel interface circuit for interconnecting said single message memory with said telephonic switching system;
a share memory for storage of identification codes for selected ones of said plurality of message memory locations for each of a plurality of time slot channels;
a controller for issuing command signals with respect to each of said time slot channels in response to a computer of the telephonic network; and
a sequencer responsive to said controller for selectively causing said single message memory to successively write out, through the multichannel interface circuit, the plurality of selected tone and announcement messages at said selected ones of the plurality of addressable message locations for each of said time slot channels in accordance with a command signal directing it to do so.
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Accused Products
Abstract
A tone and announcement PCM code generator (10) outputs to selected multiple channels of a TDM telephonic switching system (12) selected tones and voice announcements stored in a message memory (16) according to command signals from a telephonic switching system central controller (12A) through a share memory (20) to a state machine, or sequencer, (22). The sequencer controls the message memory (16) to provide selected tones and voice announcements through a serial interface (24) on the selected TDM channels. The entire repertoire of tones and announcements can be down loaded from a central memory (12B) of the telephonic switching system (12), and customer designed voice messages from any channel of the telephonic switching system can be stored in the message memory (16) for later local playback or for up loading to the central memory (12B). All tones and announcements are processed uniformly and any tone or announcement can be preselected to any or all channels simultaneously for maximum system flexibility. The entire period of periodic tone signals including the silent segment are stored to enable processing in the same way as continuous tones.
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Citations
41 Claims
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1. An apparatus for generation tone and announcement message codes for a telephonic switching network, comprising:
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a single message memory for storing a repertoire of PCM encoded tone and announcement messages respectively at a plurality of preselected addressable message memory locations of said message memory; a multichannel interface circuit for interconnecting said single message memory with said telephonic switching system; a share memory for storage of identification codes for selected ones of said plurality of message memory locations for each of a plurality of time slot channels; a controller for issuing command signals with respect to each of said time slot channels in response to a computer of the telephonic network; and a sequencer responsive to said controller for selectively causing said single message memory to successively write out, through the multichannel interface circuit, the plurality of selected tone and announcement messages at said selected ones of the plurality of addressable message locations for each of said time slot channels in accordance with a command signal directing it to do so. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An apparatus for generating announcement message codes for a telephonic switching network, comprising:
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a message memory for storing a plurality of PCM encoded announcement messages at a plurality of addressable memory locations; a multichannel interface circuit for interconnecting said message memory with a plurality of channels of said telephonic network; and means for controlling said message memory to store a selected PCM encoded announcement received through said telephonic interface circuit from a selected channel of said telephonic switching network at selected ones of said plurality of memory locations associated with the selected channel. - View Dependent Claims (27, 28, 29)
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30. An apparatus for generating tone message codes for a telephonic switching network, comprising:
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a local tone message memory for storing a plurality of PCM encoded tone messages at a plurality of addressable memory locations; a multichannel interface circuit for interconnecting said message memory with a central tone memory of said telephonic switching system; and means for controlling said tone message memory for downloading PCM encoded tone messages from said centro tone memory of the telephonic switching system at selected addressable memory locations of said tone message memory. - View Dependent Claims (31, 32, 33)
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34. A method of selectively providing PCM codes for a plurality of tones and announcements to a plurality of different time division multiplexing channels of a multichannel telephonic switching network having a central control computer, comprising the steps of:
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storing the message codes for the plurality of tones and announcements in a message memory at addressable memory locations therein; temporarily storing in a reprogrammable memory a representation of a sequence of addresses of selected ones of the addressable memory locations for each channel of said multichannel telephonic switching network in response to asynchronous command signals from said central control computer, different command signals causing temporary storage of representations of different tones and announcements; and selectively, sequentially writing out the message codes at the addressable memory locations of said sequence of addresses to each of the channels of the telephonic network during a succession of time slots of said channels, respectively. - View Dependent Claims (35, 36, 37, 38)
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39. A method of generating a periodic tone signal for a telephonic switching network, comprising the steps of:
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storing in PCM code a plural number of cycles of a tone corresponding to a preselected time period of periodic tone generation of the periodic tone signal at a preselected periodic tone memory location of a memory; storing a plural number of PCM codes representative of substantially zero amplitude corresponding to a preselected time period of periodic silence of the periodic tone signal adjacent to the PCM codes of the plural number of cycles of tone of the preselected periodic tone memory location, said PCM codes of plural cycles of tome together with the PCM codes of substantially zero amplitude forming at least one complete period of the periodic tone signal; and selectively reading the PCM codes of the periodic tone signal in response to a command signal from the telephonic switching network for producing an audible period tone signal. - View Dependent Claims (40, 41)
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Specification