Apparatus and method for reducing the time required to acquire synchronization with an incoming data stream

• Main Author: SPAGNA FULVIO
• Format: Patent
• Language: English
• Published: 14.08.2001
• Edition: 7
• Subjects: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

The inventive apparatus includes a first filter which receives an analog-based input signal and a feedback signal, performs equalization on the analog-based input signal and the feedback signal, and outputs an equalized signal based on the analog-based input signal and the feedback signal. The first filter may include an analog finite impulse response filter. The apparatus also includes an analog to digital converter which receives the equalized signal and outputs a digital signal converted from the equalized signal in accordance with the feedback signal. In addition, the apparatus includes a phase detector which receives the digital signal, detects a phase difference therefrom and outputs a signal corresponding to a magnitude of the phase difference. The apparatus also includes a second filter and a voltage controlled oscillator. The second filter receives and filters the signal corresponding to a magnitude of the phase difference and outputs a filtered signal corresponding to a magnitude of the phase difference. The voltage controlled oscillator receives the filtered signal corresponding to a magnitude of the phase difference and outputs the feedback signal. The first filter performs equalization on the analog-based input signal and feedback signal in accordance with a function defined by an expression having a plurality of coefficients including a first coefficient. Significantly, only the first coefficient of the plurality of coefficients is set equal to a value of one and any remaining coefficients of the plurality of coefficients are set to a value of zero.