Method and apparatus for DC compensation
First Claim
1. A DC compensation module for suppressing the DC content of a signal containing a periodic sequence, comprising a signal transport path, a signal compensation path and a combination unit,said signal transport path transferring the signal from the input of the module to an input on the combination unit,said signal compensation path being coupled to another input on the combination unit and comprising a low pass filter filtering a signal transferred via the signal compensation path,said low pass filter of the signal compensation path comprising a notch at a frequency corresponding to the period of the periodic signal, andsaid combination unit supplying an output signal in response to the difference between the signals received from the transport path and from the signal compensation path.
1 Assignment
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Accused Products
Abstract
A DC compensation module for suppressing the DC content of a signal containing a periodic sequence comprises a signal transport path (10), a signal compensation path (13) and a combination unit (11). The signal transport path (10) transfers the signal from the input of the module to an input on the combination unit (11). The signal compensation path (13) is coupled to another input on the combination unit (11), and is provided with a low pass filter (14; 17) filtering a signal transferred via the signal compensation path (13). The low pass filter (14; 17) of the signal compensation path (13) is provided with a notch (20) at a frequency corresponding to the period of the periodic signal. The combination unit (11) supplies a signal in response to the difference between the signals received from the signal transport path (10) and from the signal compensation path (13).
10 Citations
17 Claims
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1. A DC compensation module for suppressing the DC content of a signal containing a periodic sequence, comprising a signal transport path, a signal compensation path and a combination unit,
said signal transport path transferring the signal from the input of the module to an input on the combination unit, said signal compensation path being coupled to another input on the combination unit and comprising a low pass filter filtering a signal transferred via the signal compensation path, said low pass filter of the signal compensation path comprising a notch at a frequency corresponding to the period of the periodic signal, and said combination unit supplying an output signal in response to the difference between the signals received from the transport path and from the signal compensation path.
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9. A DC compensation module for suppressing the DC content of a signal containing a periodic sequence, comprising a signal transport path, a signal compensation path and a combination unit,
said signal transport path transferring the signal from the input of the module to an input on the combination unit, said signal compensation path being coupled to another input on the combination unit and comprising a low pass filter filtering a signal transferred via the signal compensation path, said low pass filter of the signal compensation path comprising a notch at a frequency corresponding to the period of the periodic signal, and said combination unit supplying an output signal in response to the difference between the signals received from the transport path and from the signal compensation path, wherein the signal compensation path is comprised of a DC level hold device controlled by a monitor device which monitors the periodic signal on the output of the DC compensation device.
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10. A radiotelephone for communication via a wireless network and operable to receive a signal having a periodic preamble and a sequence of binary data in a data burst, said radiotelephone comprising a DC compensation module for suppressing a DC content of a signal containing a periodic sequence, said DC compensation module comprising:
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a signal transport path; a signal compensation path comprising a low pass filter having a notch at a frequency corresponding to the period of the periodic signal, and a combination unit having a first input for receiving the signal from the input of the DC compensation module transferred via said signal transport path, a second input for receiving the signal from said signal compensation path, and an output for supplying a signal in response to a difference between the signals on the first and the second inputs. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification