Patent · US Expired

Low-rate speech coder for non-speech data transmission

US6345251B1 · kind B1 · utility

81Cited by

8References

8Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Fredrik Jansson · Sundbyberg, SE
Erik Ekudden · Stockholm, SE
Karl Hellwig · Wonfurt, DE
Tomas Frankkila · Luleå, SE

Key dates

Filing date	Jun 15, 1999
Grant date	Feb 5, 2002
Priority date	—
Expiry date	Jun 15, 2019

Classification

Technology area (CPC G)Physics
CPC primaryG10L25/78
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Low rate data signals, such as standard TTY signals and standard DTMF signals, can be effectively analyzed and encoded by speech encoders employed in conventional digital cellular system. This is accomplished by providing a low rate data encoder in the transmission path of the low rate data signal, just prior to the speech encoder used by the digital cellular system. In so doing, the standard, low rate data signal is transformed (i.e., modified) by the low rate data encoder into a signal that is more compatible with the speech encoder. Similarly, a low rate data decoder is provided at the receiving end of the transmission path to decode the modified, low rate data signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.