Project for a Digital Telephone Network

Neu, Werner; Kündig, Albert

doi:10.1109/tcom.1968.1089911

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…The resulting codes are interesting both from the standpoint of coding and digital transmission [2] as well as computation [3]. It can be shown that the A-law, as discussed above, is a piecewise linear approximation to a compression law of the form An:…”

Section: B Codesmentioning

confidence: 99%

Digital filtering in PCM telephone systems

Kündig¹

1970

IEEE Trans. Audio Electroacoust.

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The advent of cheap and fast digital integrated circuits permits, at least in principle, the application of digital processing directly to PCM coded telephone signals. At present, the following applications look most promising: channel filters; digital conference circuits; receivers for MFC or touch-tone signals; and sampling rate conversion. Following a review of these fields, an account is given of the problems which exist specifically in a PCM telephone system.

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Section: B Codesmentioning

confidence: 99%

Digital filtering in PCM telephone systems

Kündig¹

1970

IEEE Trans. Audio Electroacoust.

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“…He received the B.E., M.E., and D.E. degrees in electrical engineering from Tokyo Institute of Technology, Tokyo, Japan, in 1966, 1968, and 1971 He joined Central Research Laboratory, Hitachi, Ltd., Tokyo, Japan, in 1971, where he has worked on the development of automatic equalizers. Currently he is engaged in the development of fiber optic digital repcaters.…”

mentioning

confidence: 99%

Optical Pulse Formats for Fiber Optic Digital Communications

Takasaki

Tanaka

Maeda

et al. 1976

IEEE Trans. Commun.

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Abxstruct-Some new optical pulse formats are investigated for solving practical problems in fiber optic communication systems. These pulse formats provide many advantageous features such as error monitoring capability, abundant timing information, uniform optical power utilization, stable detection of optical input, and so forth.It is shown that a modification of Personick's receiver design theory can be used for comparison of various optical pulse formats. The comparison suggests that for state-of-the-art fiber systems with moderate fiber loss and moderate repeater spacing, where no pulse equalization is required, some new classes of 1 binary digit converted to 2 binary digits (1B2B) or 2B3B formats will permit the realization of very simple and reliable repeaters for fiber optic digital transmission.A future low-loss fiber system may permit a very long repeater spacing with the help of equalization.In this case, application of the Experimental 6.3 Mbit/s and 100 Mbit/s transmissions demon-, correlative signal-processing technique is shown to be very promising.strate some advantageous features of these optical pulse formats.

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The Spectral Density of a Coded Digital Signal

Bosik¹

1972

Bell System Technical Journal

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The stochastic process appearing at the output of a digital encoder is investigated. Based upon the statistics of the code being employed, a systematic procedure is developed by means of which the average power spectral density of the process can be determined. The method is readily programmed on the digital computer, facilitating the calculation of the spectral densities for large numbers of codes. As an example of its use, the procedure is applied in the case of a specific multi‐alphabet, multi‐level code.

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Project for a Digital Telephone Network

Cited by 10 publications

References 8 publications

Digital filtering in PCM telephone systems

Digital filtering in PCM telephone systems

Optical Pulse Formats for Fiber Optic Digital Communications

The Spectral Density of a Coded Digital Signal

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