Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 4203008 | Digital signalling receiver for receiving PCM tones A digital signalling receiver translates pulse code modulated (PCM) tone signalling into a signal format compatible with a controller in an associated time division multiplex (TDM) telephone switching facility. In the receiver, steering signals are genera... | 05/13/1980 |
| 4155070 | Code-converter with preservation of parity The invention provides a circuit for converting M-bits of an input data word having M+A bits in addition to an input parity bit, to B-bits of an output data word having B+A bits in addition to an output parity bit. A code-conversion circuit is responsive ... | 05/15/1979 |
| 4154985 | Interface circuit for digital telephone facilities A digital telephone signal interface circuit couples data signal from one digital telephone facility, operating at one data bit rate, to another digital telephone facility operating at another data bit rate. The interface circuit includes a storage system... | 05/15/1979 |
| 4153819 | Telephone tone signalling receiver with up-conversion of frequency of tones controlled by word instructions A tone receiver, for receiving audio frequency tone signals typically used in telephone signalling, includes a reference frequency generator and a modulator for up-converting audio frequencies. Telephone network tone signalling is up-converted and coupled... | 05/08/1979 |
| 4138785 | Machine for clinching a multiple lead component A clinching machine for clinching the leads of a connector on a circuit board includes a top wall which provides a work surface having an opening for receiving the leads and a clamp for clamping the circuit board and the connector in place against the wor... | 02/13/1979 |
| 4138599 | Modular communication system having self-identifying modules Trunk and line circuits packaged as modules are provided with circuitry for generating self-identifying type-code information which is retrievable on request by the central control unit of the system. The received information is compared with the type-cod... | 02/06/1979 |
| 4124898 | Programmable clock A clock signal generator is responsive to a signal having a pulse repetition rate, and to a word instruction to generate a new signal having a pulse repetition rate according to the word instruction. The clock signal generator in one embodiment is capable... | 11/07/1978 |
| 4123624 | Switching network for a PCM TDM system A two-stage switching network is provided wherein the two stages are interconnected by a pseudo space switch. The input and output ports of the network, each comprising a plurality of channels, are partitioned into groups each one of which is common to a ... | 10/31/1978 |
| 4122534 | Parallel bidirectional shifter A circuit for shifting a binary data word having N-bits any number up to N-1 positions left or right is described. A shifting network having a plurality of levels for shifting a binary word a predetermined number of positions in only one predetermined dir... | 10/24/1978 |
| 4103108 | Circuit and method for digitally measuring signal levels of PCM encoded signals A digital circuit for the level measurement of PCM signals representing an analogue signal and encoded in accordance with a predetermined companding law comprising a selector circuit having position 0-n for selecting integers between 0 - n; a sampling cir... | 07/25/1978 |
| 4103112 | Telephone line circuit with differential loop current sensing and compensation The invention provides a telephone line circuit in which the likelihood of exposing circuit devices in an associated switching facility to potentially damaging currents or voltages is greatly reduced. A repeat coil includes a primary winding for connectio... | 07/25/1978 |
| 4076965 | Universal receiver/sender A universal receiver/sender is achieved by providing circuitry having parameters setable by binary data words from the data processing unit of a switching facility. A clock signal generator provides output signals corresponding to respective binary instru... | 02/28/1978 |
| 4069399 | TDM PCM Communication system A TDM PCM communication system includes a plurality of user terminals, a switching network and a CPU for controlling the establishment of transmission paths between the user terminals and the switching network for the transfer of information between prede... | 01/17/1978 |
| 4041255 | Switching circuit for telecommunications lines A switching circuit includes a magnetically latching relay and associated contacts connected between a subscriber loop and associated subscriber equipment. In one state of latched operation the subscriber equipment is connected to the loop via the contact... | 08/09/1977 |
| 4040120 | Electrostatic protection for a telecommunications terminal apparatus A telecommunications terminal apparatus, connected to a transmission facility which includes a source of energizing current and an earth connection, is protected from static discharge of the type typically originating with a user. The terminal apparatus i... | 08/02/1977 |
| 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 filter to high and low band translator circuits. Each tra... | 06/07/1977 |
| 4021652 | Incrementally adjustable digital attenuator/amplifier An interface circuit adapted to selectively input serial and parallel PCM coded words and to selectively output serial and parallel PCM coded words is connected to a memory means. The memory means has a storage capacity for at least 2n memory w... | 05/03/1977 |
| 4018995 | Noise suppression circuit for switched telephone lines A circuit for suppressing noise pulses generated by the transfer of a charged telephone line from one supervisory circuit to another is provided. A capacitor is first connected to the telephone line and is charged to the voltage level appearing across the... | 04/19/1977 |
| 4001513 | Method and apparatus for the detection of fraudulent toll telephone calls Fraudulent toll telephone calls are detected by the recognition of extraneous supervisory signals which are generated in the originating office in response to a perpetrator placing such a call. The invention provides a means of detecting a second proceed-... | 01/04/1977 |
| 3949238 | Distributed power switch for modular systems Power is fed from a pair of power supplies to each one of a plurality of load circuits through a distributed power switch. A plurality of switch means are each associated with a respective one of the load circuits for connecting it to one of the power sup... | 04/06/1976 |
| 3931566 | Temperature compensated current sensing circuit for a power supply A converter power supply is provided with a novel current regulating circuit. A magnetoresistive element is disposed in flux coupling proximity to the output inductor of a power supply for providing a control signal corresponding to the output current the... | 01/06/1976 |
