1
Dirk Hughes Hartogs: Ensemble modem structure for imperfect transmission media. Telebit Corporation, Townsend and Townsend, July 7, 1987: US04679227 (301 worldwide citation)

A high-speed modem that transmits and receives digital data on an ensemble of carrier frequencies spanning the usable band of a dial-up telephone line. The modem includes a system for variably allocating data and power among the carriers to compensate for equivalent noise and to maximize the data ra ...


2
Dwight W Decker, Payne Freret, Dirk Hughes Hartogs, Mark B Flowers, Frederick L Mueller: Speech and data multiplexor optimized for use over impaired and bandwidth restricted analog channels. Telebit Corporation, Donald C Feix, July 12, 1988: US04757495 (277 worldwide citation)

The present invention relates to an apparatus and method for the simultaneous transmission of analog speech and modulated data, such apparatus and method being optimized for use over impaired and bandwidth restricted analog channels, or digital representations of such channels. In each instance of u ...


3
Dirk Hughes Hartogs: Ensemble modem structure for imperfect transmission media. Telebit Corporation, Townsend & Townsend, March 15, 1988: US04731816 (233 worldwide citation)

A high-speed modem that transmits and receives digital data on an ensemble of carrier frequencies spanning the usable band of a dial-up telephone line. The modem includes a system for variably allocating data and power amount the carriers to compensate for equivalent noise and to maximize the data r ...


4
Dirk Hughes Hartogs: Ensemble modem structure for imperfect transmission media. Telebit Corporation, Townsend and Townsend, May 23, 1989: US04833706 (94 worldwide citation)

A high-speed modem that transmits and receives digital data on an ensemble of carrier frequencies spanning the usable band of a dial-up telephone line. The modem includes a system for variably allocating data and power among the carriers to compensate for equivalent noise and to maximize the data ra ...


5
Dirk Hughes Hartogs: Ensemble modem structure for imperfect transmission media. Telebit Corporation, Allston L Jones, October 1, 1991: US05054034 (91 worldwide citation)

A high-speed modem that transmits and receives digital data on an ensemble of carrier frequencies spanning the usable band of a dial-up telephone line. The modem includes a system for variably allocating data and power among the carriers to compensate for equivalent noise and to maximize the data ra ...


6
Dirk Hughes Hartogs: Adaptive expansion table in a digital telephone receiver. Canon Kabushiki Kaisha, Fenwick & West, August 29, 2000: US06111935 (48 worldwide citation)

A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote party (90). The send equipment (40) comprises an A-law map (12) and a mu-law map (43). Receive equipment ( ...


7
Dirk Hughes Hartogs: Transmission of analog and digital information across a single line. Canon, Elizabeth F Enayati, Edward J Radlo, February 27, 1996: US05495485 (23 worldwide citation)

Apparatus for sending and receiving both analog and digital information from a single information transmission medium. The apparatus includes a core processor (200), including a digital signal processor (DSP) (212) or a CPU/DSP, in communication with an integrated services digital network (ISDN) int ...


8
Dirk Hughes Hartogs: ISDN fax routing. Canon Kabushiki Kaisha, Fenwick & West, December 29, 1998: US05854829 (14 worldwide citation)

Apparatus for efficiently routing facsimiles to and from a plurality of facsimile devices (62,64,66). At least one BRI line (16) is coupled to several ISDN terminals (21-28). At least one multiplexer (31,32) is coupled to the outputs of the terminals (21-28). A fax server (50) is coupled to the outp ...


9
Dirk Hughes Hartogs: Ink intrusion resistant digital code. Canon Kabushiki Kaisha, Paul Hentzel, March 22, 1994: US05296693 (12 worldwide citation)

A two dimensional row and column based system for storing digital data is formatted on a suitable base medium such as paper sheet 10. The data format is formed by a plurality of data units 10U having L data entry locations 14. The data is contained in the selective presence or absence of recording i ...


10
Dirk Hughes Hartogs: ISDN fax routing. Canon Kabushiki Kaisha, Edward J Radlo, August 12, 1997: US05657381 (11 worldwide citation)

Apparatus for efficiently routing facsimiles to and from a plurality of facsimile devices (62, 64, 66). At least one BRI line (16) is coupled to several ISDN terminals (21-28). At least one multiplexer (31, 32) is coupled to the outputs of the terminals (21-28). A fax server (50) is coupled to the o ...



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