Method and apparatus for connecting broadband voice and data signals to telephone systems
Assignee1021 Technologies KK
InventorsRichard Geiss, Joe Lung
Life of this patent
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Abstract
A system for use in connecting broadband voice and data signals to communications systems such as the telephone system. Due to the low pass filtering characteristics of a standard twisted pair used in conventional telephone access loops data band signals are attenuated more than voice band signals. The present invention provides apparatus and methods for interfacing data and voice band signals to a common communications medium, such as a twisted pair, while significantly reducing the influence of one frequency band on the other.
Claims18
A termination circuit for a subscriber line interface connected to a transmission medium for bi-directional communication of both voice and data signals, said termination circuit comprising:
- detection means to detect voice and data signals at a connection point to said transmission medium;
- a voice band return loss means monitoring said voice and data signals and generating a voice band return signal to be forwarded to said connection point, said return signal being a representation of said voice band signal;
- and
- a voice band filter connected to said return loss means said voice band filter isolating said voice band return loss signal from said data band signal.
A termination circuit for a subscriber line interface connected to a transmission medium for bi-directional communication of both voice and data signals, said termination circuit comprising:
- detection means to detect voice and data signals at a connection point to said transmission medium;
- a data band return loss means monitoring said voice and data signals and generating a data band return signal to be forwarded to said connection point, said data band return signal being a representation of said data band signal;
- and
- a data band filter connected to said return loss means said data band filter isolating said data band return loss signal from said voice band signal.
A termination circuit for a subscriber line interface connected to a transmission medium for bi-directional communication of both voice and data signals, said termination circuit comprising:
- detection means to detect voice and data signals at a connection point to said transmission medium;
- a voice band return loss means monitoring said voice and data signals and generating a voice band return signal to be forwarded to said connection point, said return signal being a representation of said voice band signal;
- a data band return loss means monitoring said voice and data signals and generating a data band return signal to be forwarded to said connection point, said data band return signal being a representation of said data band signal;
- a voice band filter connected to said return loss means said voice band filter isolating said voice band return loss signal from said data band signal;
- and
- a data band filter connected to said return loss data band means, said data band filter isolating said data band return loss signal from said voice band signal.
A system for canceling a transhybrid component and a near end echo from a data band signal at an communication system interface for bi-directional communication of voice and data band signals over a common communication medium, said circuit comprising:
- an analog circuit to estimate said transhybrid component value and said near end echo value and to subtract said estimated values from an incoming data signal;
- and
- an analog data band filter to restrict the estimation to said data band signal.
A method of terminating an interface to a connection point in a communication system for communicating voice and data band signals over a common communications medium comprising:
- providing an analog filter in a voice band return loss circuit to prevent voice band interference on the data band signal.
A method of terminating an interface to a connection point in a communication system for communicating voice and data band signals over a common communications medium comprising:
- providing an analog filter in a data band return loss circuit to prevent data band interference on the voice band signal.
A method of terminating an interface to a connection point in a communication system for communicating voice and data band signals over a common communications medium comprising:
- providing a first analog filter in a voice band return loss circuit to prevent voice band interference on the data band signal and providing a second analog filter in a data band return loss circuit to prevent data band interference on the voice band signal.
A method of canceling a transhybrid component and near end echo from a data signal at an interface to a communication system for bi-directional communication of voice and data band signals over a common interface comprising:
- providing an analog circuit for removing said transhybrid component and near end echo from an incoming signal;
- and providing an analog data band filter for preventing data band interference on the voice band signal.
Dependencies are inferred from the claim text.