JPS5763937A - Noise suppression system - Google Patents
Noise suppression systemInfo
- Publication number
- JPS5763937A JPS5763937A JP55139495A JP13949580A JPS5763937A JP S5763937 A JPS5763937 A JP S5763937A JP 55139495 A JP55139495 A JP 55139495A JP 13949580 A JP13949580 A JP 13949580A JP S5763937 A JPS5763937 A JP S5763937A
- Authority
- JP
- Japan
- Prior art keywords
- correlation
- output
- signals
- circuit
- coefficient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
Landscapes
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Radio Transmission System (AREA)
Abstract
PURPOSE:To improve an S/N ratio by putting two input signals in phase and adding them synchronously by providing a delay equalizing means in front of an adaptive filter which depends upon a coefficient of frequency correlation. CONSTITUTION:A sound from one signal source 34 is acquired by microphones 32 and 33, whose signals are supplied to terminals 24 and 25. The input signals to the terminals 24 and 25 are A/D-converted 26 and 27 and the resulting signals are supplied to a delay equalizing stage 23 to be put in phase before being inputted to an adaptive filter part 11. At the filter part 11, those two signals are separated by high-speed Fourier arithmetic circuits 14 and 15 into frequency components X1- Xn, and Z1 and Zn, which are added synchronously by an adder 18. Simultaneously, a correlation coefficient calculating circuit 16 finds a coefficient of correlation between the both, and the result is weighted by a weighting circuit 17 corresponding to a weight function. The output of the adder 18 is multiplied 19 by the output of the circuit 17, and the output of a noise component having no correlation is decreased and outputted; and respective frequency components are synthesized by a high-speed Fourier arithmetic circuit 21, whose output is converted into an analog signal by a DA converter 22.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55139495A JPS5763937A (en) | 1980-10-06 | 1980-10-06 | Noise suppression system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55139495A JPS5763937A (en) | 1980-10-06 | 1980-10-06 | Noise suppression system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5763937A true JPS5763937A (en) | 1982-04-17 |
JPS6214139B2 JPS6214139B2 (en) | 1987-03-31 |
Family
ID=15246593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55139495A Granted JPS5763937A (en) | 1980-10-06 | 1980-10-06 | Noise suppression system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5763937A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58181099A (en) * | 1982-04-16 | 1983-10-22 | 三菱電機株式会社 | Voice identifier |
JPH02192325A (en) * | 1989-01-20 | 1990-07-30 | Nec Corp | In-phase synthetic space diversity receiver |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53135204A (en) * | 1977-04-27 | 1978-11-25 | Western Electric Co | Signal processor |
-
1980
- 1980-10-06 JP JP55139495A patent/JPS5763937A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53135204A (en) * | 1977-04-27 | 1978-11-25 | Western Electric Co | Signal processor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58181099A (en) * | 1982-04-16 | 1983-10-22 | 三菱電機株式会社 | Voice identifier |
JPH023520B2 (en) * | 1982-04-16 | 1990-01-23 | Mitsubishi Electric Corp | |
JPH02192325A (en) * | 1989-01-20 | 1990-07-30 | Nec Corp | In-phase synthetic space diversity receiver |
Also Published As
Publication number | Publication date |
---|---|
JPS6214139B2 (en) | 1987-03-31 |
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