A Digital Carrier-Concentrator System with Elastic Traffic Capacity

Boxall, F.

doi:10.1109/tcom.1974.1092097

IEEE Trans. Commun.

1974

DOI: 10.1109/tcom.1974.1092097

|View full text |Cite

A Digital Carrier-Concentrator System with Elastic Traffic Capacity

F. Boxall¹

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

1983

1991

Publication Types

Select...

Article3

Relationship

Self Cite0

Independent3

Authors

Journals

Cited by 3 publications

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

Transmission Errors and Forward Error Correction in Embedded Differential Pulse Code Modulation

Goodman

Sundberg

1983

Bell System Technical Journal

View full text Add to dashboard Cite

We have derived formulas for the combined effects of quantization and transmission errors on the performance of embedded Differential Pulse Code Modulation (DPCM), a source code that can be used for variable‐bit‐rate speech transmission. Our analysis is more general and more precise than previous work on transmission errors in digital communication of analog signals. Special cases include conventional DPCM and Pulse Code Modulation (PCM). Our main result is a signal‐to‐noise ratio formula in which the effects of source characteristics (input signal, codec design parameters) and the effects of transmission characteristics (modulation, channel, forward error correction) are clearly distinguishable. We also present, in computationally convenient forms, specialized formulas that apply to uncoded transmission through a random‐error channel, transmission through a slowly fading channel, and transmission with part or all of the DPCM signal protected by an error‐correcting code. Numerical results show how channel coding can have different effects on conventional and embedded DPCM. They also show how the binary‐number representation of quantizer outputs influences performance.

show abstract

Transmission Errors and Forward Error Correction in Embedded Differential Pulse Code Modulation

Goodman

Sundberg

1983

Bell System Technical Journal

View full text Add to dashboard Cite

show abstract

Adapted packet speech interpolation

Lacovara

Vaman

1991

Int. J. Satell. Commun.

View full text Add to dashboard Cite

Adapted packet speech interpolation (APSI) is presented as an evolution of digital speech interpolation (DSI) techniques. The inherent overload penalties of DSI are mitigated by the use of an overload strategy which distributes the penalties uniformly across all active speech sources. A novel use of linear delta modulation (LDM) allows the system to re‐encode the input sources at various rates depending upon the total offered load to the system. The subjective performance of hardware is discussed. Two models of silence and talk‐spurt behaviour (called activity) of speech are presented: an analytic model for single speakers obtained by the application of renewal theory, and a simulation model obtained from the analytic model.

show abstract

The evolution of digital loop carrier

Andrews¹

1991

IEEE Commun. Mag.

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

A Digital Carrier-Concentrator System with Elastic Traffic Capacity

Cited by 3 publications

References 1 publication

Transmission Errors and Forward Error Correction in Embedded Differential Pulse Code Modulation

Transmission Errors and Forward Error Correction in Embedded Differential Pulse Code Modulation

Adapted packet speech interpolation

The evolution of digital loop carrier

Contact Info

Product

Resources

About