Title:
PWM SIGNAL GENERATOR, PWM SIGNAL GENERATING DEVICE, AND DIGITAL AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2008/012904
Kind Code:
A1
Abstract:
In a full digital amplifier for an audio amplifier or the like, it is possible to suppress
the concentration of an electromagnetic noise emission spectrum at a specific
frequency. A sampling period variation type digital filter is realized by varying
the coefficient of a noise shaping filter (3) for the delta-sigma modulator of
the full digital amplifier depending on a sampling period. This allows the variation
in the carrier frequency of the pulse width modulation.
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Inventors:
YONEYA AKIHIKO (JP)
Application Number:
PCT/JP2006/314917
Publication Date:
January 31, 2008
Filing Date:
July 27, 2006
Export Citation:
Assignee:
NAT UNIV CORP NAGOYA INST TECH (JP)
YONEYA AKIHIKO (JP)
YONEYA AKIHIKO (JP)
International Classes:
H03M5/08; H03F3/217; H04L25/49
Foreign References:
| JP2006054800A | 2006-02-23 | |||
| JP2005236928A | 2005-09-02 | |||
| JP2006054815A | 2006-02-23 | |||
| JPH0563457A | 1993-03-12 | |||
| JP2006101112A | 2006-04-13 | |||
| JP2003264465A | 2003-09-19 | |||
| JPH11266579A | 1999-09-28 |
Other References:
YONEYA A. E: "Full Digital Amplifier no Tameno PWM Hai Hoshogata Noise Shaping Filter/Noise Shaping Filter Compensating PWM Disortion for Fully Digital Amplifier.", THE TRANSACTIONS OF THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN C IEEJ TRANSACTIONS ON ELECTRONICS, INFORMATION AND SYSTEMS, vol. 125, no. 12, 1 December 2005 (2005-12-01), pages 1818 - 1823, XP003024403
Attorney, Agent or Firm:
MORITA, Kenichi (NAGOYA-SHOKO-KAIGISHO Bldg.9F 10-19, Sakae 2-chome, Naka-k, Nagoya-shi Aichi 22, JP)
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