Broadband network access device for voice data transmission
View Patent ↗In the broadband network access device for transmitting narrowband, low-frequency voice signals and broadband, higher-frequency data signals, the voice data is sampled in the data clock pattern and subsequently decimated. The transmission of the data which has already been decimated to the voice clock to the voice DSP (DSP) is still carried out in the data clock pattern. The conversion to the voice clock pattern is carried out in a synchronization interface (SM), directly upstream of the voice DSP. The same applies correspondingly in the opposite direction of transmission. The invention is used in xDSL methods, for example ADSL.Lite.
1. A broadband network access device for the transmission of voice and data, comprising:
one or more broadband subscriber line interface circuits, parallel with one another, for connecting to analog telephone subscriber lines;
a splitting device which splits narrowband, low-frequency voice signals and broadband, higher-frequency data signals from one another in both directions of transmission and converts the voice and data signals into a digital signal in the direction of transmission to a network by sampling, and in the opposite direction of transmission into an analog signal;
a digital voice signal processor for processing the voice signal data, which is connected to a digital voice network;
a digital data signal processor for processing the data signal data, which is connected to a digital data network;
wherein the voice signals are sampled in the splitting device in the direction of transmission to the digital voice network with a multiple of a data clock base, and subsequently decimated, and the data, decimated to the voice clock, is transmitted to the digital voice signal processor in a data clock pattern which is multiple of the data clock base; and
wherein the conversion to a voice data pattern, which is a multiple of a voice clock base, is carried out in a synchronization interface module upstream of the digital voice signal processor which is provided for processing the voice data; and
a phase locked loop that is supplied with a multiple of the voice clock base and generates a signal with a frequency that is a multiple of the data clock base on which the data sampling is based.
2. The broadband network access device of claim 1 , wherein the synchronization module is combined at the module level with the digital voice signal processor that is provided for processing the voice data.
3. The broadband network access device of claim 1 , wherein the synchronization interface module is embodied as a device for performing soft synchronization between the data clock pattern and the voice data pattern.
4. The broadband network access device of claim 1 , wherein the data clock base is 4.3125 kHz and the voice clock base is 8 kHz.
5. The broadband network access device of claim 1 , wherein the broadband network access device is used for implementing a xDSL (x-Digital Subscriber Line) system.