Automatic number identification blocking system
Granted: November 3, 1992
Patent Number:
5161181
ANI Blocking System (ABS) logically interfaces between a calling party and a called party in a telephone network which provides CallerID and CallerID blocking. The ABS automatically: (1) accepts a call from the calling party; (2) places a call to the called party; and (3) connects the called party with the calling party.
Converter for in-band routing and/or origination information
Granted: September 3, 1991
Patent Number:
5046088
An ANI Converter System (ACS): (1) logically interfaces between: (a) a telephone network, on the one hand, and customer premises equipment (CPE), on the other hand, or (b) two portions of a switched telephone network, such as two tandem toll switching machines; (2) accepts incoming calls; (3) extracts in-band network routing and/or origination information such as ANI information; (4) uses the information to extract relevant information from a data base; and (5) places a call to a…
Method and apparatus for identifying speech in telephone signals
Granted: December 18, 1990
Patent Number:
4979214
Method and apparatus for identifying telephone signals which are produced by a human voice. The method includes determining a measure of the energy of predetermined frequency bins of the frequency spectrum of the signal for a frame comprised of a predetermined number of consecutive samples of the signal, if the signal is an analog signal; averaging the measure of the energy of the predetermined frequency bins over a predetermined number of frames to provide a frame group average energy…
Method and apparatus for frequency analysis of telephone signals
Granted: June 5, 1990
Patent Number:
4932062
For faster realtime analysis related to Discrete Fourier Transform (DFT), prestored pre-multiplied values of amplitude times cosine and sine functions are used. Method and apparatus for determining the content of a predetermined frequency bin f in the frequency spectrum of a signal and, in particular, a signal which occurs in a telephone network, includes the step of storing on a storage means:C.sub.k (x.sub.k,n)=x.sub.k *cos(2.pi.kn/N) and S.sub.k (x.sub.k,n)=x.sub.k *sin(2.pi.kn/N)for:…
Measurement of transmission quality of a telephone channel
Granted: August 29, 1989
Patent Number:
4862492
Apparatus and method for measuring the transmission quality of a telephone line, for example, a telephone line connected between two voice processing systems. The apparatus includes means for generating a predetermined sequence of DTMF pulses having predetermined amplitude values and for transmitting them over a telephone line; means for receiving DTMF pulses from a telephone line and determining the value of each pulse; means for counting the number of received DTMF pulses; and means…
Automated call filter
Granted: July 25, 1989
Patent Number:
4852149
A Call Filter System (CFS): (1) logically interfaces between a public telephone network and business customer premises equipment; (2) automatically processes incoming and outgoing calls which are amenable to such intervention; and (3) enlists the aid of human intervention on calls requiring such intervention. The CFS includes a network line interface (NLI) for receiving calls from and placing calls to the public telephone network; a premises line interface (PLI) for receiving calls from…
Detection of single-frequency signals
Granted: July 18, 1989
Patent Number:
4849688
Apparatus for detecting a single-frequency signal having a predetermined frequency in an analog signal includes means for converting the analog signal to a differentially encoded digital signal and detection means for detecting a single-frequency signal having the predetermined frequency from the differentially encoded digital signal. In a preferred embodiment, the detection means includes: means for detecting one cycle of the analog signal by detecting a signal maximum followed by…
Peripheral interrupt interface for multiple access to an interrupt level
Granted: July 26, 1988
Patent Number:
4760516
Circuitry which permits a plurality of peripherals to share a single interrupt signal line in computer systems and thereby increase the number of peripherals which can be supported.
Method and apparatus for controlling access to an asynchronous communication network
Granted: April 5, 1988
Patent Number:
4736365
A method and apparatus for communication circuit acquisition in an information processing system for high throughput communication of digital information is disclosed. High throughput is achieved by providing acquire logic circuitry for acquiring a communication circuit among a multiplicity of communication circuits, which are preferably four-wire, full duplex bidirectional channels for serial communication of digital information, and by preferably providing full duplex, bidirectional…
Method and apparatus for fault tolerant serial communication of digital information
Granted: March 10, 1987
Patent Number:
4649384
A method and apparatus for serial communication of digital information in an information processing system for high throughput fault tolerant communication is disclosed. High throughput is achieved by providing a multiplicity of communication circuits, which are preferably four-wire, full duplex bidirectional channels for serial communication of digital information, and by providing full duplex, bidirectional communication of messages at a first rate and half duplex, unidirectional…
