2024年3月13日发(作者：闫乾)
专利内容由知识产权出版社提供
专利名称：Digital demodulator
发明人：Byung-Joo Kang,Kyu-Hyoun Park,Kyung-
Hoon Cheun,Kwon-Hyu Choi
申请号：US09004201
申请日：19980108
公开号：US06310924B1
公开日：20011030
专利附图：
摘要：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&ohgr;t and
sin&ohgr;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.
申请人：HYUNDAI ELECTRONICS INDUSTRIES CO., LTD.
代理机构：Lackenbach Siegel
代理人：J. Harold Nissen
更多信息请下载全文后查看
2024年3月13日发(作者：闫乾)
专利内容由知识产权出版社提供
专利名称：Digital demodulator
发明人：Byung-Joo Kang,Kyu-Hyoun Park,Kyung-
Hoon Cheun,Kwon-Hyu Choi
申请号：US09004201
申请日：19980108
公开号：US06310924B1
公开日：20011030
专利附图：
摘要：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&ohgr;t and
sin&ohgr;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.
申请人：HYUNDAI ELECTRONICS INDUSTRIES CO., LTD.
代理机构：Lackenbach Siegel
代理人：J. Harold Nissen
更多信息请下载全文后查看