Source: https://patents.google.com/patent/US7113557B2/en
Timestamp: 2018-07-20 19:14:00
Document Index: 612050164

Matched Legal Cases: ['art 27', 'art 27', 'art 27', 'art 5', 'art 5', 'art 19']

US7113557B2 - Noise canceling method and apparatus - Google Patents
Noise canceling method and apparatus Download PDF
US7113557B2
US7113557B2 US10047132 US4713202A US7113557B2 US 7113557 B2 US7113557 B2 US 7113557B2 US 10047132 US10047132 US 10047132 US 4713202 A US4713202 A US 4713202A US 7113557 B2 US7113557 B2 US 7113557B2
US10047132
US20030002590A1 (en )
FIG. 4A is a structure diagram of a transmission/reception system according to a prior art; and FIG. 4B is a transmission/reception system according to the prior invention. As shown in FIG. 4B, on a transmission side, there is provided a zero point inserting part 27-2 between a transmission signal generating part 27-1 and a nyquist transmission path 27-3. The zero point inserting part 27-2 inserts a specific signal having an insertion time position, an amplitude and a phase, which are previously specified. Hereinafter, it is assumed that the specific signal has an amplitude equal to zero and the specific signal is referred to as “zero point signal” or simply referred to as “zero signal”.
C = ⁢ Z ⁡ [ t ⁡ ( n ) ] = T ⁡ ( z ) = ⁢ ( 1 / 2 ) × [ S ⁡ ( z ) + S ⁡ ( - z ) ] ( 3 )
FIG. 19A is a graph showing a distribution of a noise power output from the noise distribution detecting part 5-10 having a 6-kHz interval. FIG. 19B is an illustration of a determination by comparison between frequency components having a copy relationship in the power comparing part 5-20, that is, power values of f0 and f′0, f1 and f′1, . . . , f31 and f′31. According to the determination by comparison, a result of determination is output by setting the frequency band having a larger power value to “1” and the frequency band having a smaller power value to “0”. If the power values are equal to each other, the lower band is set to “1”, and the higher,band is set to “0”.
FIGS. 33, 34 and 35 show a channel rearranging operation according to a noise distribution. FIG. 33 shows an example of a noise distribution detected by a noise distribution recognition part in the reception side. The reception side investigates a noise distribution using a no-transmission energy section (NTE frame), and represents “1” or “0” as to whether a noise has a constant value for each frequency band, and notifies the remote station of the result of investigation. FIG. 33 indicates an example in which noises in the bands F5, F14, F′5 and F′13 exceed a predetermined value. It should be noted that the noise distribution recognition corresponds to the output of the noise distribution recognizing part 19-24 shown in FIG. 32.
US10047132 2001-06-20 2002-01-15 Noise canceling method and apparatus Expired - Fee Related US7113557B2 (en)
JP2001-186276 2001-06-20
US20030002590A1 true US20030002590A1 (en) 2003-01-02
US7113557B2 true US7113557B2 (en) 2006-09-26
US10047132 Expired - Fee Related US7113557B2 (en) 2001-06-20 2002-01-15 Noise canceling method and apparatus
US20100190462A1 (en) * 2009-01-29 2010-07-29 Denso Corporation Communication device
EP0798871A1 (en) 1995-10-18 1997-10-01 Toyo Communication Equipment Co. Ltd. Method and device for separating and presuming noise contained in spread spectrum signal
WO1998021849A1 (en) 1996-11-08 1998-05-22 Deutsche Telekom Ag Method for suppressing interference signals during transmission of digital signals
US8378810B2 (en) 2009-01-29 2013-02-19 Denso Corporation Communication device
JP2003008521A (en) 2003-01-10 application
EP1303094A3 (en) 2006-08-30 application
JP3427381B2 (en) 2003-07-14 grant
EP1814277A2 (en) 2007-08-01 application
EP1303094A2 (en) 2003-04-16 application
EP1814277A3 (en) 2007-09-19 application
US20030002590A1 (en) 2003-01-02 application
CN1392687A (en) 2003-01-22 application