Patent Number: 6,310,924

Title: Digital demodulator

Abstract: A digital demodulator which is capable of simplifying an application specific integrated circuit (ASIC) of a demodulator using a combined sampling technique. The digital demodulator includes a mixer for multiplying an IF signal from the IF output unit and a local oscillating signal from the local oscillator, a low pass filter for eliminating an image frequency component generated during an operation of the mixer, an A/D converter for converting an output signal from the low pass filter into a digital signal, a multiplier for multiplying an output data from the A/D converter and cos.omega.t and sin.omega.t which are combined signal values and converting into a base band width signal frequency, a demultiplexer for separating a base band width digital data into an I-signal component and Q-signal component, a frequency/phase difference detector for performing the signal processing and compensating the detected frequency and phase difference, an analog low pass filter for filtering an output signal from the frequency/phase difference detector, and a local oscillator for compensating the frequency/phase difference filtered by the analog low pass filter and providing the oscillating frequency which is synchronized with the IF signal inputted from the IF output unit to the mixer.

Inventors: Kang; Byung-Joo (Seoul, KR), Park; Kyu-Hyoun (Seoul, KR), Cheun; Kyung-Hoon (Kyungsgangbuk-do, KR), Choi; Kwon-Hyu (Jeonlamam-do, KR)

Assignee: Hyundai Electronics Industries Co., Ltd.

International Classification: H04L 27/233 (20060101); H04L 027/16 ()

Expiration Date: 10/30/2018