Title:
DEVICE FOR PERFORMING FREQUENCY CONVERSION OF DIGITAL SIGNAL
Document Type and Number:
Japanese Patent JPH07154152
Kind Code:
A
Abstract:
PURPOSE: To reduce the cost of a device for converting frequency of digital signal by simplifying the constitution of the device by providing a plurality of stages each composed of a mixer which converts digital signals into IF signals, an LPF which prevents looping, and a decimator which resamples data at a lower rate. CONSTITUTION: A device for converting frequency of digital signal is composed of multiple stages each composed of a mixer, a filter, and a decimator (MFD), the mixer 202 fetches signals Iin, Qin representing a complex signal I+jQ and the mixer 202 is composed of a multiplier 204 and an adder 206 and outputs IF signals upon receiving signals (A+jB) of a cosine component A and a sine component B. The comb-line filter 222 removes noise caused by looping effect from the IF signals and the decimator 242 outputs data sampled by setting the data rate at 1/N. Therefore, the constitution of the device becomes simple and the cost of the device is reduced as compared with the case where a single complicated high-frequency mixer is used, because the stages operate at different rates and mixed operation is broken up into simple operations.
Inventors:
JIEI UIRIAMU UIKEHAATO
JIEEMUSU ARUFURETSUDO WAAGUNIA
JIEEMUSU ARUFURETSUDO WAAGUNIA
Application Number:
JP15130494A
Publication Date:
June 16, 1995
Filing Date:
July 01, 1994
Export Citation:
Assignee:
FORD MOTOR CO
International Classes:
H03D7/00; H03D7/16; H04B1/26; (IPC1-7): H03D7/00; H04B1/26
Attorney, Agent or Firm:
Akira Asamura (3 outside)
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