Invention Grant
US08499328B2 Agile distortion and noise cancellation across multiple channels and ports in a CATV upconverter/modulator
有权
CATV上变频器/调制器中多个通道和端口的敏捷失真和噪声消除
- Patent Title: Agile distortion and noise cancellation across multiple channels and ports in a CATV upconverter/modulator
- Patent Title (中): CATV上变频器/调制器中多个通道和端口的敏捷失真和噪声消除
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Application No.: US13016169Application Date: 2011-01-28
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Publication No.: US08499328B2Publication Date: 2013-07-30
- Inventor: Colin Howlett , Gerald Harron , Michael Jaspar
- Applicant: Colin Howlett , Gerald Harron , Michael Jaspar
- Applicant Address: CA Victoria, BC
- Assignee: Vecima Networks Inc.
- Current Assignee: Vecima Networks Inc.
- Current Assignee Address: CA Victoria, BC
- Agency: Ade & Company Inc.
- Agent Adrian D. Battison
- Main IPC: H04N7/16
- IPC: H04N7/16
Abstract:
A distortion-cancellation method for analog CATV or QAM transmission over cable is provided wherein a single feedback path from the output of a multiple-channel multiple-port upconverter/modulator is down-converted and used to reduce or cancel undesirable noise components including LO leakage, spurious, and modulated noise. The method allows for real-time monitoring, tuning, or control of the CATV/QAM output and of interfering signals and aging effects as compared to a desired performance metric.
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