However, several problems are encountered which must be overcome to allow the DSP to be used to implement the type W309B equalizer. Further, the availability of digital signal processor (DSP) integrated circuits would seem to facilitate this implementation. Currently, with the increasing use of digital electronic circuits in telephony for cost savings, it is desirable to implement the commonly used W309B equalizer in a digital circuit. Bump and slope characteristics of the equalizer are set by a craftsman using switch settings. A commonly used equalizer is an analog circuit referred to as a type W309B. In telephony an equalizer is used on a subscriber line circuit to compensate for losses in transmission by providing frequency selective attenuation. H04B3/141- Control of transmission Equalising characterised by the equalising network used using multiequalisers, e.g.H04B3/14- Control of transmission Equalising characterised by the equalising network used.H04B3/04- Control of transmission Equalising.Assignors: NORTEL NETWORKS CORPORATION Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Assignors: NORTHERN TELECOM LIMITED Assigned to NORTEL NETWORKS LIMITED reassignment NORTEL NETWORKS LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: EASTERLING, ROBERT D., Application granted granted Critical Publication of US5226059A publication Critical patent/US5226059A/en Assigned to NORTEL NETWORKS CORPORATION reassignment NORTEL NETWORKS CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd Priority to US07/578,458 priority Critical patent/US5226059A/en Assigned to NORTHERN TELECOM LIMITED reassignment NORTHERN TELECOM LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Original Assignee Northern Telecom Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Fasterling Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US07/578,458 Inventor Robert D. Google Patents US5226059A - DSP line equalizerÄownload PDF Info Publication number US5226059A US5226059A US07/578,458 US57845890A US5226059A US 5226059 A US5226059 A US 5226059A US 57845890 A US57845890 A US 57845890A US 5226059 A US5226059 A US 5226059A Authority US United States Prior art keywords equalizer coefficients dsp predetermined numbers bump Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |