Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 5884255 | Speech detection system employing multiple determinants A speech detection system is provided with multiple speech detector sub-systems. The speech detection sub-systems employ distinct statistical methods for determining whether speech is present in an electronic communication signal received at an output ter... | 03/16/1999 |
| 5793753 | Telecommunications network management observation and response system A system for monitoring and managing the operations of a multi-technology telecommunications network is disclosed. The system includes programmable probes operatively connected to a network for monitoring data transfer activity on the network and collecti... | 08/11/1998 |
| 5784361 | Bi-directional asynchronous telecommunication audio signal processing An apparatus is provided for digital signal processing of telecommunication signals along respective transmit and receive paths of a two-way telecommunication link. The respective transmit and receive signals each include an audio data component and a tim... | 07/21/1998 |
| 5721730 | Spectral noise compensation for telecommunication signal processing A telecommunication signal processor includes a noise compensation system for preventing undesirable spectral modulation of the noise component of a telecommunication signal subjected to a process wherein subband portions of the signal are variably attenu... | 02/24/1998 |
| 5631958 | Automatic echo cancellation for an integrated services digital network interface An echo canceler is connected to an ISDN Primary Rate Interface. The echo canceler is provided with an activation processor for monitoring call control messages on the D-channel and for selectively enabling or disabling echo cancellation on any of the B-c... | 05/20/1997 |
| 5561668 | Echo canceler with subband attenuation and noise injection control An echo canceler for canceling echo components of a send-input signal, includes an analysis filter bank for dividing the send-input signal into a plurality of subband send-input signals. A receive-signal is also divided into a plurality of subband receive... | 10/01/1996 |
| 5550901 | Full-duplex adapter for PBX telephone system An adapter for interconnecting a tip-ring telephone, a PBX telephone, and a private branch exchange (PBX) is configured to pass out-of-band signals between the PBX telephone and the PBX and to attenuate voice-band signals therebetween when the tip-ring te... | 08/27/1996 |
