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US 5,670,957 AGranted
Methods for communicating with a telecommunications device for the deaf
AssigneeMicrolog Corporation
InventorsGeorg E. Morduch, Joe J. Lynn
Life of this patent
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AssigneeMicrolog Corporation
InventorsGeorg E. Morduch, Joe J. Lynn
Estimating the term…
An automatic telephone answering system employs a switch activated by any of several techniques to select a language for communication with a caller. A single matrix determines the content of a message to be generated in response to input from the caller. A single matrix can be used because it is arranged in accordance with the content of the various messages and not on the specific language of the messages. All of the messages for each respective language are stored in a separate directory such that a given identifier obtained from the matrix will recall that message in the language determined by identification of the particular directory. A telecommunications device for the deaf (TDD) is treated in the same manner as a language and selection of messages employs the same matrix used for traditional languages. Received TDD signals are converted to ASCII for storage, and messages to be identified by the matrix are stored in ASCII and converted to TDD before transmission.
A method for converting message signals stored in ASCII format comprising providing a lookup table for converting an ASCII character code to a Baudot character code, storing digital waveforms, each of said digital waveforms comprising a plurality of digital samples representing the analog waveform of a respective character in analog Baudot tone code, converting said message signals by said lookup table to Baudot signals, and recalling digital waveforms corresponding to said Baudot signals.
A method for converting message signal stored in ASCII format comprising providing a lookup table for converting an ASCII character code to a Baudot character code, storing digital waveforms, each of said digital waveforms representing a respective character in Baudot code, converting said message signals by said lookup table to Baudot signals, recalling digital waveforms corresponding to said Baudot signals;
A method for converting message signals stored in ASCII format comprising providing a lookup table for converting an ASCII character code to a Baudot character code, storing digital waveforms, each of said digital waveforms representing a respective character in Baudot code, converting said message signals by said lookup table to Baudot signals, recalling digital waveforms corresponding to said Baudot signals, wherein the step of storing said digital waveforms comprises storing a plurality of digital samples of each of said Baudot code characters, said digital samples being characterized by a sampling rate at least twice as great as the highest frequency of said analog signals.
A method for converting message signals stored in ASCII format comprising providing a lookup table for converting an ASCII character code to a Baudot character code, storing digital waveforms, each of said digital waveforms representing a respective character in Baudot code, converting said message signals by said lookup table to Baudot signals, recalling digital waveforms corresponding to said Baudot signals, wherein the Baudot code characters represented by said digital waveforms each comprise a plurality of information bits having predetermined durations and frequencies, and further comprising the step of selecting said durations and frequencies such that the duration of each of said Baudot code characters is an integral number of cycles at the corresponding frequency.
A method for converting message signals stored in ASCII format comprising providing a lookup table for converting an ASCII character code to a Baudot character code, storing digital waveforms, each of said digital waveforms representing a respective character in Baudot code, converting said message signals by said lookup table to Baudot signals, recalling digital waveforms corresponding to said Baudot signals, selectively setting the amplitude of said digital waveforms.
A method for converting message signals stored in ASCII format comprising providing a lookup table for converting an ASCII character code to a Baudot character code, storing digital waveforms, each of said digital waveforms representing a respective character in Baudot code, converting said message signals by said lookup table to Baudot signals, recalling digital waveforms corresponding to said Baudot signals, wherein said digital waveforms comprise digital data that has been compressed in accordance with a data compression algorithm, and wherein said digital waveforms are de-compressed in accordance with said algorithm after being recalled.
A method for ascertaining information represented by single-frequency analog signals, comprising applying said analog signals to an analog to digital converter to produce digital representations of said analog signals, determining the frequencies of said analog signals by determining from said digital representations the number of occurrences per unit time of a selected characteristic of said signals, and ascertaining from said frequencies said information represented by said analog signals.
A method for determining the presence or absence of an analog signal, comprising applying said analog signal to an analog to digital converter to produce a plurality of digital samples of said analog signal, processing said digital samples using a data compression/decompression algorithm in which a variable step pointer is calculated, and comparing the calculated value of said step pointer with a threshold value to indicated the presence or absence of said analog signal.
Dependencies are inferred from the claim text.