Infineon Technologies Ag

Siemens Aktiengesellschaft

Gerald H&ouml;fer

Herbert Zojer

Stephan Wim&ouml;sterer

Ulrich Tomalla

Pidder Kassel

Codec circuit for increasing the data transmission rate in a modem transmission with a first programmable digital filter ( ) which is connected into a transmission signal path of the Codec circuit, a second programmable digital filter ( ) which is connected into a reception signal path of the Codec circuit, a modem signal detection device ( ) for detecting whether the transmission signal which is output on the transmission signal path or the reception signal which is received on the reception signal path is a modem signal, the modem signal detection device ( ) switching the first and second digital filters ( ) to a widened filter bandwidth when a modem signal is detected.

Codec circuit and method for increasing the data transmission rate during a modem transmission

Digital code words are transmitted via a digital communication network, e.g. from a digital modem ( ) to an analog modem ( ). Whenever an RBS technique is used for an RBS channel, a given bit, as a rule the LSB, of a corresponding code word is changed. In order to recognize and correct such RBS channels, training code words transmitted during a training phase are evaluated. If an RBS channel is detected, the given bit of the corresponding code word is set to a fixed value.

Method and apparatus for correcting digital code words in a digital communication network

The S -interface for ISDN base access connects a four-wire line with a receiver line pair and a transmitter line pair to an ISDN terminal device, subject to potential separation within the interface. Each of the receiver lines has a respective capacitor for potential separation and the transmitter lines have a transformer. An inductance is connected into each receiver line and each transmitter line on the interface side. Preferably, the receiver line pair is connected to a voltage amplifier on the device side. The voltage amplifier has a voltage amplification in the same ratio as the voltage amplification of the transformer in the transmitter line pair.

Growing community of inventors

Langerringen, Germany

Gerald Höfer

Growing community of inventors

Langerringen, Germany

Gerald H&ouml;fer

Gerald Höfer