IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0027004
(1993-03-05)
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발명자
/ 주소 |
- Enge Per (Los Altos CA) Farmer Dominic (Milpitas CA) Westfall Brian (Mountain View CA)
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| 출원인 / 주소 |
- Trimble Navigation Limited (Sunnyvale CA 02)
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| 인용정보 |
피인용 횟수 :
103 인용 특허 :
0 |
초록
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Method and apparatus for reducing or cancelling impulse noise from a signal containing noise. The desired noise-free signal is assumed to have a representative frequency w3, but may have a range of frequencies adjacent to this frequency, and is assumed to have substantially zero amplitude for all fr
Method and apparatus for reducing or cancelling impulse noise from a signal containing noise. The desired noise-free signal is assumed to have a representative frequency w3, but may have a range of frequencies adjacent to this frequency, and is assumed to have substantially zero amplitude for all frequencies ww1 and/or for all frequencies ww2, where w1w3w2 or w1w2. An input (noisy) signal is filtered and analyzed in a narrow frequency region surrounding ww1 and/or a narrow frequency region surrounding ww2 to obtain one or two output signal components n1(t) and/or n2(t), respectively, that, ideally, contain no contribution from the desired signal. The input signal is also filtered and analyzed in a narrow frequency region surrounding ww3 to obtain an output signal s(t)+n3(t) component including the desired signal s(t). A linear combination of signals, such as S(t)=s(t)+n3(t)±[n1(t)n2(1)] ½, or S(t)=s(t)+n3(t)+af1(t)n2(1)]½,or S(t)=s(t)+n3(t)±nk(t) (k=1,2), or S(t)=s(t)+n3(t)+exp(-jfk(t), or S(t)=s(t)+n3(t)+[exp(-jy1(t)+exp(-jy2(t)]/2, or S(t)=s(t)+n3(t)+ay1(t)+exp(-jy2(t)]/2, is formed as a circuit output signal, and the ±sign and/or the multiplier afyyy1(t) and n2(t), replacing the (complex) arithmetic mean and geometric mean, may be used for the linear combination signal S(t). Methods for computation of the phase angles fyyy
대표청구항
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A method for removing impulse noise from a circuit electrical signal s(t) that includes a desired signal s0(t) plus a noise signal n(t), where each component may vary with time t, the method comprising the steps of: receiving a circuit input signal that is a sum of a desired signal s0(t) plus a nois
A method for removing impulse noise from a circuit electrical signal s(t) that includes a desired signal s0(t) plus a noise signal n(t), where each component may vary with time t, the method comprising the steps of: receiving a circuit input signal that is a sum of a desired signal s0(t) plus a noise signal n(t) that includes impulse noise from a circuit electrical signal, where the noise signal n(t) is to be determined; passing the circuit input signal through a bandpass filter, with a selected frequency passband PB, to form a bandpassed signal; passing the bandpassed signal through a first selected signal processing channel that has frequency support contained in a first frequency band having a central frequency w1, to produce a first noise signal n1(t); passing the bandpassed signal through a second selected signal processing channel that has frequency support contained in a second frequency band, having a central frequency w2, that is spaced apart from and does not overlap any part of the first frequency band, to produce a second noise signal n2(t); passing the bandpassed signal through a third selected signal processing channel that has a third frequency band, having a central frequency w3, that is spaced apart from and does not overlap any part of the first frequency band and the second frequency band, to produce a third channel output signal s(t)+n3(t), where the third channel has frequency support contained in the third frequency band that includes substantially all frequencies that contribute to the desired signal s(t), and where the frequencies w1, w2 and w3 lie in the selected frequency pass band PB; where the first, second and third selected channels include frequency shift by selected first, second and third shift frequencies, respectively, and include passage through a low pass filter with selected first, second and third roll-off frequencies, respectively, to form first, second and third channel output signals, respectively; forming a combined signal that is a symmetric, homogeneous function HS{n1(t), n2(t); qqqq1 or 2); forming a linear combination signal LC{HS{n1(t), n2(t); q3(t)}of the combined signal HS{n1(t), n2(t); q3(t); adjusting the parameters q1(t), n2(t); q3(t)}provides a best possible estimate of the desired signal s(t), according to a selected criterion, for an optimal choice qq0 of these parameters; and issuing the linear combination signal LC{HS{n1(t), n2(t); qq0}; s(t)+n3(t)}as an estimate of the desired signal s(t).
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