DSpace DSpace 日本語

AIT Associated Repository of Academic Resources >
A.研究報告 >
A1 愛知工業大学研究報告 >
3.愛知工業大学研究報告 .B(1976-2007) >
26号 >

Please use this identifier to cite or link to this item: http://hdl.handle.net/11133/875

Title: Short Time DFTフィードフォワードシラビックコンパンダの特性と構成
Other Titles: Short Time DFT フィード フォワード シラビック コンパンダ ノ トクセイ ト コウセイ
Authors: 岸, 政七
KISHI, Masahichi
Issue Date: 31-Mar-1991
Publisher: 愛知工業大学
Abstract: Reducing the spectrum occupancy over radio channels is as well known as important to prevent from exhausting radio spectrum resources. The syllabic compandor provides with indispensable function both to improve speech quality and reduce fading noise over radio channels against to saving transmission power and narrowing spectrum occupancy. Therefore, many invesitigations are keenly studied on realizing the syllabic compandors. Unfortunatelly, most of them have been concerned with approximation in the way of AM demodulation to estimate envelope component with certain intermodulation error between input signals and their envelopes. When such approximating envelope detector is adopted to compressor/expander, the intermodulation error in the approximately estimated envelopes induces harmonic distortions to expand spectrum occupancy and to degrade speech quality in the aprior communication systems. An exact compandor is succesfully discussed with employing instantaneous spectrum analysis insted of AM demodulation approximations in realizing the envelope detectors, which is based on that compressing/expanding is precisely performed on the frequency domain. After being decomposed into instantaneous spectrum, input signals are processed via dividing/multiplying along each vector of the instantaneous spectrum components. The output signals are synthesized from the compressed/expanded instantaneous spectrum without alomost any harmonic distortions.
URI: http://hdl.handle.net/11133/875
Appears in Collections:26号

Files in This Item:

File Description SizeFormat
紀要26号B(P183-189).pdf896.5 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback