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Document Title |
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4088838 |
Voice response system
Improvements in a push button signal receiving device for use in a voice response system, wherein in order to permit a push button signal from a user's telephone terminal to be received even during...
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4061885 |
Digital tone decoder
A digital tone decoder includes means for generating a timing signal, zero crossing counter means for generating a decode signal after a predetermined number of zero crossings in response to an...
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4048450 |
Trunk circuit traffic analyzer
Analyzer for monitoring the traffic of a group of trunks conveying decimal code signalling and dialling impulses and multifrequency code signalling and dialling signals. It comprises multifrequency...
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4044206 |
Digital decoder for multiple frequency telephone signalling
A multiple-frequency decoder which measures the two-tone output from a multiple-frequency dial type telephone and identifies what number was dialed. A unique binary code is produced as a timed...
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4042787 |
Output processing and output coupling circuit for a digital tone receiver
A circuit is provided to convert a set of mutually exclusive digital signals representing presence or absence of individual tones of a Dual Tone Multiple Frequency (DTMF), or 2-of-8 signal, system...
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4042790 |
Voice guard circuit for a tone receiver
Analog detection of invalid signal conditions at the input to a Dual Tone Multiple Frequency (DTMF) tone receiver is provided. The average of the voltage peak amplitudes of the signals in the upper...
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4042788 |
Tone detector
A digital tone detector is of the period detection type employing a digital counter which is stepped by means of a high speed clock. The counter is reset by zero-crossings of an analog tone signal....
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4028501 |
Method and apparatus for translating multiple frequency signalling
A multiple frequency signalling receiver translates combinations of tone signals received from a telephone set to derive binary two out of eight coded signalling. Received signals are directed by a...
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4025730 |
In-band signal receiver
A multifrequency signal receiver for an in-band audio frequency signalling system uses Discrete Fourier Transform or Fast Fourier Transform processing techniques or a combination of both to...
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4016370 |
Digital tone decoder
A decoder is disclosed for use in a communication system wherein bits of information are conveyed by the transmission, on a communication line, of code tones of distinctive frequencies each...
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4016371 |
Frequency tone detection
The detection of frequency tones, such as used in telephone pushbutton dialing to identify the digits of a called number, is performed in a digital manner which affords both speed and reliability...
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4009353 |
Analog signal detection
Disclosed is a method and apparatus for detecting the presence of signals, particularly touch-tone signals, of characteristic complex waveforms by comparing unknown signals with pre-specified...
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4001521 |
Signal identification system
A signal identification system, in which a signal of a specified frequency included in an analog signal indicated by an input pulse train converted from the analog signal is detected from the pulse...
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3963878 |
Signal interpreting system for frequency selective multifrequency tone dialing
A signal interpreting system for frequency-selective multi-frequency tone dialing includes a code tester and a code converter, and two serially connected delay means processing the output of said...
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3961143 |
Multi-frequency signalling system
A multi-frequency receiver is provided as part of a system able to evaluate the presence of 2 out of 5 signals and which incorporates 5 channel paths each including a parallel resonant circuit each...
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3959603 |
Dual tone multiple frequency receiver/decoder
A method and apparatus for separating the two analog component signals which make up a dual tone multiple frequency (Touch Tone) signal, converting the component signals into digital identification...
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3934097 |
Multifrequency tone detection
A method and apparatus for detecting multifrequency tones in a received signal by summing aperiodic samples and without using bandpass filters. In a receiver capable of detecting m different tones...
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3931480 |
Time compression receiver
Time compression receiver for detecting the signalling tones in a DTMF (dual tone multi-frequency) format present on eight receiver input lines. A multiplexer repeatedly samples the input signals...
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3917912 |
Multifrequency dialing signal receiver for push-button type telephone systems
A dialing signal receiver for use in a push-button type telephone system is described. In the proposed system, the multifrequency dialing signal is first divided into a pair of frequency...
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3906365 |
Limiter circuit
In a multi-frequency receiver for use in telecommunications system, tones within the audio frequency range are received. The tones transmitted are separated, amplified, and shaped into square...
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3706855 |
GENERATOR FOR DIGITAL PULSE SIGNALS REPRESENTATIVE OF ANALOG SIGNAL PAIRS
A technique of multifrequency pulsing consisting of transmitting a digitally valid number over pulse code modulated carrier from a time division multiplex office. The signals generated thereby...
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3649771 |
VF PUSHBUTTON SIGNALING ARRANGEMENT
This relates to "guard" arrangements for a VF receiver, especially for handling 2 × (1 out of 4) code signals from pushbutton subscriber sets. It is shown that if signals from a high-impedance...
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3614322 |
SYSTEM FOR SELECTING AND REPRODUCING PERCEPTIBLE PROGRAMS
A system for selecting and reproducing audio, video, or other humanly perceptible programs comprises a program source providing a multiplicity of program signals, a plurality of stations at which...
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3582565 |
TONE CHANNELS FOR MULTIFREQUENCY RECEIVERS
A tone channel of the type used in multifrequency receivers has in cascade an input band-pass filter that has a frequency curve similar to that of overcoupled filters, a limiter-amplifier, and an...
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3562434 |
INTEROFFICE SIGNALING SYSTEM EMPLOYING SELECTED ONES OF THE TOUCH-TONE TELEPHONE FREQUENCIES FOR ESTABLISHING INTEROFFICE CONNECTIONS
A system for providing interoffice connections as may be necessary to couple calling and called parties within a telephone network employing multifrequency signals of the Touch-Tone telephone type...
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3539731 |
MULTIFREQUENCY SIGNAL RECEIVER
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3482051 |
VOICE-FREQUENCY KEY DIALLING FACILITY
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3428757 |
MULTIFREQUENCY INBAND TELEPHONE SIGNALING SYSTEMS
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3334190 |
Centralized repertory system for multifrequency signaling telephones
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3270144 |
Dial signal receiving facilities
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3259697 |
Telephone signaling system
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3231675 |
Multidigit register circuit
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3229041 |
Voice-frequency signal receivers as used in telephone systems
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3209076 |
Multi-frequency supervisory signal receiving system
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3140357 |
Multifrequency receiver
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3133994 |
Conference circuit for telephone switching systems
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3129290 |
Impulse register
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3114005 |
Inband signaling system
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3057964 |
Multifrequency signaling receiver
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2847508 |
Stage-by-stage all-relay telephone switching system using voice frequency control
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2832834 |
Signalling arrangement for telecommunication systems
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