Robbed bit signal detection and compensation
First Claim
1. A method of detecting and compensating for a periodic disturbance in sampled data, comprising steps of:
- identifying a period of N samples at which the periodic disturbance repeats;
collecting a first subset of the sample data, said first subset being a representative acquisition of a first series of each Nth sample taken from the sampled data, wherein said collecting stores data representative of the first subset of sample data, the least significant bits of the first subset of sample data, and integrates the least significant bits of the first subset of sample data;
detecting the presence of the periodic disturbance in said first subset;
adjusting the sample data to minimize the effect of error introduced in the sampled data by the periodic disturbance; and
collecting a second subset of sampled data by integrating the least significant bits of the second subset of sampled data as a representative acquisition of a second series of each Nth sample taken from the sampled data.
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Accused Products
Abstract
Detection and compensation for periodic disturbances in sampled data such as the error introduced by robbed bit signaling (RBS) in a digital carrier system. A period of N samples, e.g., six or twelve frames, at which the periodic disturbance repeats is identified for collecting a subset of the sampled data, i.e., samples taken from a common frame. In a digital telephone network (DTN), the RBS disturbance repeats at an integer multiple of 6 frames; signaling bits A, B in a superframe (SF), or at a period of 12 frames. In an extended superframe (ESF), the RBS may repeat every 24 frames, using signaling bits A, B, C, D in one of every sixth frame. An embodiment detects the presence of the periodic robbed bit signaling disturbances in sampled data by integrating the least significant bits (lsbs) of the subset samples from a frame to determine whether in-band signaling is being performed in the frame. Thus, the octets of identified frames may be adjusted by plus or minus a half least significant bit magnitude to compensate for the error introduced by T-Carrier signaling and the like.
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Citations
11 Claims
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1. A method of detecting and compensating for a periodic disturbance in sampled data, comprising steps of:
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identifying a period of N samples at which the periodic disturbance repeats;
collecting a first subset of the sample data, said first subset being a representative acquisition of a first series of each Nth sample taken from the sampled data, wherein said collecting stores data representative of the first subset of sample data, the least significant bits of the first subset of sample data, and integrates the least significant bits of the first subset of sample data;
detecting the presence of the periodic disturbance in said first subset;
adjusting the sample data to minimize the effect of error introduced in the sampled data by the periodic disturbance; and
collecting a second subset of sampled data by integrating the least significant bits of the second subset of sampled data as a representative acquisition of a second series of each Nth sample taken from the sampled data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification