Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7110518 | Network support for enhanced dialing capability A method is provided for supporting an enhanced dialing service in telecommunications equipment. The method includes: receiving a series of dialed digits from customer premises equipment (CPE) (10); determining if the dialed digits correspond to a designated ... | 09/19/2006 |
| 7035394 | Tone detector judging a detection of a predetermined tone signal by comparing a characteristic quantity of the tone signal with characteristic quantities of other signals A tone transmission part transmits a tone signal. A tone signal detection part detects data representing an echo signal of the tone signal transmitted by the tone transmission part, and detects data representing a predetermined tone signal targeted to be detected. T... | 04/25/2006 |
| 6940964 | Push-button signal receiving circuit and a method of detecting a push-button signal A push-button signal receiving circuit and a push-button signal detection method are provided which can enhance frequency detection accuracy and yet can reduce erroneous determination as to the valid length of PB signal and thus erroneous operation. Valid signal det... | 09/06/2005 |
| 6937717 | Low power signal detection The present invention provides a low power method and apparatus for detecting a signaling tone. The apparatus comprises a resonator which can be configured to resonate at a specified frequency, a controller for configuring the resonator, and a comparator for compari... | 08/30/2005 |
| 6853725 | Method and apparatus for off-hook management of plural subscriber premises devices connected to same telephone line An off-hook management telecommunication system comprising a DTMF detector, an encoder and a microprocessor located within a channel unit. The system allows the user to depress a selected sequence of keys during a line connection which indicate to the microprocessor... | 02/08/2005 |
| 6839429 | Spectral optimization for communication under a peak frequency-domain power constraint System and methods for determining an optimized transmit spectra (spectral distributions of transmission power) for a set of communications channels that experience cross-talk among themselves and for transmitting data on the channels. The transmit spectra are prefe... | 01/04/2005 |
| 6829768 | Information processing method and information processing apparatus An information processing apparatus has an SDL execution unit described in a specification and description language (SDL), an external environment description unit described in a programming language other than the SDL, and an adapter having a pseudo internal signal... | 12/07/2004 |
| 6590972 | DTMF detection based on LPC coefficients A system and method for DTMF tone detection receives an input signal. The input signal includes a DTMF tone. The DTMF tone has a first frequency and a second frequency. An initial first frequency and an initial second frequency of said DTMF tone are selec... | 07/08/2003 |
| 6366669 | System and method for providing universal access to interactive voice response systems A system and method for allowing callers using DP telephones to access IVR systems, including monitoring DP signals until a dialed digit is recognized, where the DP signals are generated by a transmission element and received by a reception element within... | 04/02/2002 |
| 5926544 | Direct current feed with line status change adaptation in a communication system A line card integrates subscriber line interface circuitry, A/D and D/A converters, and digital signal processing technology. The digital signal processing technology performs many line card tasks such as switch hook detection, ground key detection, DC fe... | 07/20/1999 |
| 5881146 | Method and apparatus for determining digits dialed using a selected algorithm A technique for minimizing the number of users which must dial training digits in a voice processing system. The system uses the first digit normally dialed as part of the user responses to the voice processing application, and measures such digit to dete... | 03/09/1999 |
| 5822424 | Dial pulse detector and detecting method for paging service for mechanical telephone subscriber A dial pulse detector in a paging system for rendering a paging service for a subscriber who uses a mechanical telephone includes a delay correlativity calculator for receiving dial pulses generated by predetermined pre-test dialing digits dialed by the s... | 10/13/1998 |
| 5787159 | Use of caller ID information An improved voice processing system is described which utilizes caller ID information, or portions thereof, in order to change processing parameters utilized by the voice processing system to process future signals received during a telephone call.... | 07/28/1998 |
| 5646991 | Noise replacement system and method in an echo canceller A noise replacement system and method for providing a synthesized noise replacement signal to an output speech channel in an echo cancellation system. A far-end speech signal transmitted through a communications channel may be passed through an echo chann... | 07/08/1997 |
| 5638437 | Telecommunication system and method enabling a user to get access to an automated call processing from a central station operating on pulse dialling mode The present invention is related to a telecommunication system and method enabling a user to get access to any of automated call processing systems. The system comprises in combination a telephone line interface means adapted to provide function of a tele... | 06/10/1997 |
| 5638435 | Impulse signal convertor An impulse convertor for converting a received telephone impulse dialing signal into a restored dialing signal has a limiter-amplifier, a signal detector, an output formatter, and a controller. The limiter-amplifier receives the impulse dialing signal fro... | 06/10/1997 |
| 5521967 | Method for monitoring telephone call progress A call progress monitor and algorithm for placing a telephone call over the telephone lines. The algorithm is hierarchically arranged having three major routines or portions: tone detection, signal recognition and situation recognition. The tone detection... | 05/28/1996 |
| 5422945 | Fast last digit detection of a dialed telephone number A method and system for efficiently recognizing the last digit of a computer-dialed DTMF telephone number. The actual gaps between a number of first-dialed successive digits are compared with a standard gap exhibited during computer dialing to determine w... | 06/06/1995 |
| 5347572 | Telephone line monitoring apparatus and method A fax monitoring apparatus comprises one or more line interface circuits to simultaneously detect and analyze audio signals produced on any given telephone line by two connected fax machines, analyzing circuitry to analyze and interpret the audio signals ... | 09/13/1994 |
| 5307403 | Telephone branch line transmission circuit with blocking capacitor A telephone branch line transmission circuit includes a control device which receives dial pulses and in response thereto controls at least two switching devices arranged between two branch lines to a telephone exchange. A blocking capacitor is coupled to... | 04/26/1994 |
| 5218636 | Dial pulse digit detector Method and apparatus for detecting and identifying dial pulse digits in a telephone signal. An embodiment of the inventive method includes the steps of: detecting a dial pulse "0" digit; analyzing the dial pulse "0" digit to determine a predetermined set ... | 06/08/1993 |
| 5144652 | Device for connecting a subscriber line to a selected internal line Device for connecting one out of a plurality of internal lines (34,36) to an information exchange subscriber line, such as a telephone, facsimile or telex line, provided with decoding means (28,1-16) to detect dialling disc pulses (a), preferably on base ... | 09/01/1992 |
| 4944001 | Rotary dial pulse receiver Apparatus and method for receiving and decoding the bursts of line current activity produced by rotary dial action in dialing a sequence of digits. In accordance with the apparatus of the present invention, a rotary dial pulse receiver counts the number o... | 07/24/1990 |
| 4924501 | Dial pulse selection A dial pulse detection system 20 has an analogue input buffer 22, an analogue to digital converter (ADC) 24, a processor 25, and an output buffer 26. Processor 25 operates on the digitally encoded samples produced by ADC 24 from the received signal to ach... | 05/08/1990 |
| 4860230 | Signal recognition system A signal persistence time interval recognition system reproduces a condition of an input signal as a condition of an output signal only when the input signal condition persists for at least a predetermined time interval. The system periodically scans the ... | 08/22/1989 |
| 4845752 | Multi-signal processor synchronized system A multiprocessor system includes a plurality of signal processors and a common unit processor. Each of the signal processors is connected to a different source of signals such as voice signals and performs one or more signal processing functions relative ... | 07/04/1989 |
| 4839920 | Method for determining telephone dial pulse parameters independently of subscriber line length A method is disclosed for measuring telephone dial pulse parameters independent of telephone subscriber line length. To avoid distortions resulting from varying subscriber line lengths, there is performed during the first pulse interval of a dial pulse se... | 06/13/1989 |
| 4811381 | Direct inward dial integration apparatus A direct inward dial integration device is connected to the trunk side of a PBX in a business telephone system. The present invention permits a voice message system (VMS) to answer forwarded calls with a personal greeting of a called party. When a direct ... | 03/07/1989 |
| 4782520 | Pulse receiver circuit providing longitudinal balance A pulse receiver for connection in a telephone circuit including two coils connected between a voltage potential and ground further including an external impedance that is alternately connected between the coils. The pulse receiver includes a first impeda... | 11/01/1988 |
| 4720853 | Ring signal discriminator An improvement to automatic answering and call forwarding features used in telephone communications which allows a user to remotely activate, modify, and deactivate these features. The improvement describes a transformerless means for coupling signals to ... | 01/19/1988 |
| 4712233 | Monolithic telephone subscriber line interface circuit The present invention is an improved subscriber line interface circuit which allows fast detection of an off-hook signal in the presence of a ringing signal during an answer mode while also permitting fast detection of dialing pulses during a calling mode... | 12/08/1987 |
| 4604713 | Tone detector and multifrequency receiver using said detector The purpose of the receiver is to indicate the reception of a multifrequency signal and to identify said signal. A multifrequency signal is a signal combining two predetermined pure tones, one belonging to a high-frequency range, the other to a low-freque... | 08/05/1986 |
| 4590432 | Constant-percent break pulse corrector Constant-percent break interval pulse correctors insure that the break interval of a dial pulse subsists for a substantially constant percentage of the total pulse interval; i.e., break interval plus make interval. The constant-percent break interval puls... | 05/20/1986 |
| 4475011 | Arrangement of interactive telephone switching processors providing selective functional capability by port A telephone switching system for telephone lines in a telephone network that carry voice and associated supervisory information signals. The voice signals are received through one of a plurality of ports under the control of a port event processor and are... | 10/02/1984 |
| 4440979 | Current sink for DPT channel unit DC Saturation effects in the VF transformer of a DPT are reduced or eliminated with apparatus diverting cental office battery loop current away from windings of the transformer when a trunk circuit is seized for an off-hook condition of a calling parties ... | 04/03/1984 |
| 4071708 | Dial pulse detector A dial pulse detector apparatus accurately detects the occurrence of dial pulses in the presence of adverse line conditions resulting in severe signal distortions due to inductive effects, noise and loading by other pieces of equipment. Signals greater th... | 01/31/1978 |
| 4065642 | Message signaling and alerting system and method thereof A telephone signaling and paging system is disclosed. The signaling and paging system senses the presence of a telephone message when recorded by a telephone answering system and automatically dials a preselected number to provide an alerting signal or pa... | 12/27/1977 |
| 4042784 | Digit storer for telecommunication system A storage network co-operating with a marker comprises a shift register whose stages are loaded in parallel with the digits of a call number received from a local subscriber, the first digit or digits of that call number being read out to an associated ma... | 08/16/1977 |
| 4017689 | Digit analysis system for private automatic branch exchange telephone system Digit analysis within an electronic private automatic branch exchange telephone system is carried out through interconnected sections of digit decoder circuitry. A first portion of the digit decoder effectively processes dialed impulses originating within... | 04/12/1977 |
| 4013838 | Telephonic enquiry system This system allows remote enquiry of the status of a condition over the telephone transmission lines by sending a code number with the telephone and specifically includes means for both decoding multifrequency telephone signals and detecting the number of... | 03/22/1977 |
