Near-echo suppression

US7039020B1 · kind B1 · utility

Assignee

• STMICROELECTRONICS N.V. · NL

Inventors

• Gunnar Bahlenberg · Luleå, SE
• Daniel Bengtsson · Luleå, SE
• Siwert Hakansson · Luleå, SE
• Anders Isaksson · Luleå, SE
• Lars-Ake Isaksson · Luleå, SE
• Mikael Isaksson · Luleå, SE
• Magnus Johansson · Luleå, SE
• Mauritz Lahti · Huddinge, SE
• Lis-Marie Ljunggren · Luleå, SE
• Hans Lundberg · Luleå, SE
• Tomas Nordstrom · Luleå, SE
• Lennart Olsson · Luleå, SE
• Sven-Rune Olofsson · Älvsbyn, SE
• Tomas Stefansson · Luleå, SE
• Hans Oman · Luleå, SE
• Goran Okvist · Luleå, SE
• Per Ödling · Ayacucho, PE
• Petra Dentgen · Ljusdal, SE
• Franck Sjöberg · Luleå, SE

Key dates

• Filing date: Oct 27, 1998
• Grant date: May 2, 2006
• Expiry date: Oct 27, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B3/23
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The hybrid circuit can be used to substantially reduce near echo signals. The circuit includes a balanced 2-wire to 4-wire hybrid for interconnecting a two wire receive path and a two wire transmit path to a two wire transmission line. The two wire receive path connects the balanced hybrid to an A/D converter and the two wire transmit path connects a D/A converter to the balanced hybrid. The two wire receive path contains a filter, dimensioned to remove signals transmitted from the D/A converter. The invention is particularly adapted for use with FDD and OFDD.