Automatic tracking device and method

An automatic tracking device and clock signal technology, applied in automatic power control, television, instruments, etc., can solve the problems of reduced tracking quality, impracticality, time-consuming, etc., and achieve the effect of excellent tracking quality, easy implementation, and small memory
CN1222175CInactive Publication Date: 2005-10-05MAGIC PIXEL
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
MAGIC PIXEL
Publication Date
2005-10-05
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The design and processing method to detect the frequency and phase shift of input signal includes one or several samplers to response the clock signal to sample input signal. The number for each sample is determined and the sample difference value is calculated, and the difference value is self-multiplied with the products being accumulated. The sample is carried out to the data set of various clock signal, and the variance sum of the response to the frequency and phase shift of the input signal is selected.
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Description

technical field

[0001] The present invention relates to a device and method for detecting the frequency and phase shift of an input signal. The device applies time-domain methods to control a clock signal used to sample an input signal and detect its frequency and phase. Background technique

[0002] Automatic tracking for real-time video applications consists in automatically tracking the frequency and phase shift angle of the analog input signal. Some solutions are found in frequency domain methods, such as fast Fourier transform (hereinafter referred to as FFT), discrete cosine transform (hereinafter referred to as DCT) or wavelet (wavelet). However, these frequency domain methods are expensive to implement in hardware. Furthermore, because of the computational complexity of these frequency domain methods, it is usually not practical to analyze the entire data screen for automatic tracking. Frequency-domain methods often only analyze a small portion of the entire scree...

Claims

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