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Automatic Segmentation of Speech

Thesis Info

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Author

Mirza Muhammad Ali Baig

Program

PhD

Institute

NED University of Engineering & Technology

City

Karachi

Province

Sindh

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Electrical Engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/10810/1/Mirza_Muhammad_Ali_Baig_Elect.Engg_HSR_2017_NED_UET_03.13.2019.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727709058

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Time-aligned and labeled speech at sub-word level is required to develop spoken language technology components. Determining time boundaries of sub word units of speech and labelling those, is the speech segmentation problem. Manual human-labeling is considered to be the most accurate, which however requires significant amount of time when large amount of speech has to be dealt. The evidences which humans employ are based on knowledge of acoustic-phonetics and at very basic level works on spectrograms based techniques. Based on a hypothesis that computers can also segment speech automatically if evidence which human experts utilizes are used, leads us towards time effective automatic speech segmentation. In this thesis unsupervised automatic time-alignment of speech at sub-word level is carried out based on the pieces of information which spectrograms carry. The speech spectrogram engineered in this thesis does not possess information of vocal excitations and capture dynamics of vocal tract only. The novel feature is found suitable for segmentation problem and utilizes both forward and inverse characteristics of vocal tract (FICV). Additionally to evaluate the suitability of a feature extraction technique for speech segmentation task, a framework has also been developed. In the thesis, speech segmentation is carried out on indigenously developed Classical Arabic (CA) dataset and therefore becomes first scheme of its kind for CA which is an under resourced language in speech technology. The performance of FICV based speech segmentation scheme is compared and shown to be significantly better than standard unsupervised and supervised techniques both in terms of error-rates and alignment accuracies. Reduction of 12.29% in error rates is achieved with FICV based feature when compared with standard unsupervised technique. Carrying out supervised segmentation requires a basic sub-word level recognizer, which labels and aligns speech. In this connection a Hidden Markov Model (HMM) based speech recognizer is trained. The acoustic modeling is carried using a discriminative technique which shows better recognition accuracies of up to 4% than the non-discriminative technique. Thesis also verifies that using manually-labeled data for training acoustic models can further improve recognition accuracies by 3-4%. In this regard, thesis carries details of experimental steps which can also serve as guideline for developing an automatic speech recognizer for CA.
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ناول

اُس کا گاؤںسو، سوا سو کچے اور دو پکے گھروں پر مشتمل تھا۔ اُس کا گاؤں دریائے راوی کا وہ اندھا طاقت ور پانی تھا جو کبھی تو ارد گرد کی زمین پر بھی بھل ڈال کر اُسے اور بھی طاقت ور اور زرخیز بناتا تو کبھی لہلہاتی فصلوں، کچے مکانوں اور دیواروں کو اپنے ساتھ بہا کر لے جاتا۔گہرے مٹیالے رنگ کا وہ جھاگ والا ٹھنڈا پانی زندگی اور موت کا جدا جدا رنگ تھا۔اُس کا گاؤں وسیع و عریض برساتی نالے کے ریتلے پیٹ میں کہیں کہیں بنے ہوئے وہ جوہڑ تھے، جن کے نم آلود کناروں پر ریت کو کھود کھود کر ہل چلانے والے ، چرواہے اور مسافر چھوٹے چھوٹے گڑھے بناتے، وہ گڑھے نتھرے ہوئے پانی سے بھر جاتے تو وہ اِس پانی سے اپنی پیاس بجھا لیتے۔:وہ جوہڑ جو برساتی نالہ خشک ہو جانے پر بھی پانی سے بھرے رہتے تھے، وہ جوہڑ جن میں نوجوان چرواہے تپتی دھوپ میں چھوٹے چھوٹے گول سینگوں والی بھینسوں کو نہلاتے، ایک دوسرے کی دیکھا دیکھی بھینسوں کے جسم کو چمکاتے اور خود ڈبکیاں لگاتے ہوئے نہاتے۔
اُس کا گاؤں پورب کی وہ ٹھنڈی ہوا تھی جو شام کو چلتی تو سانپ اور دیگر کیڑے مکوڑے اپنی قیام گاہوں سے نکل کر لہلہاتے خوب صورت کھیتوں کی پگڈنڈیوں پر بے خوف لیٹ جاتے۔ اُس کا گاؤں جیٹھ ہاڑ کی چلچلاتی اور ویران دوپہروں کی طرح تھا جن میں کنوارے لڑکے اکیلے خوشبو لگا کر باہر نکلنے سے خوف کھاتے تھے کہ کہیں چڑیلیں اُن کا کلیجہ نہ نکال لیں۔ اُن گرم دوپہروں میں چرواہے اپنے مویشیوں کو ماؤں جیسے مہربان شیشم کے درختوں کی چھاؤں میں جگالی کرتے چھوڑ کر اُن کے پاس بیٹھ کر اڈہ کھڈہ کھیلتے یا پھر فحش گانے گاتے۔
اُس کا گاؤں ساون بھادوں کی ہواؤں کے وہ تیز جھونکے...

EFFECTS OF PHYSICAL THERAPY-BASED MANAGEMENT APPROACHES FOR TENSION TYPE HEADACHE

Background of the Study: Multiple Physical Therapy approaches have recently been developed and reported in the literature for providing better results in the treatment regimens of tension-type headaches. The advancement in the field of Physical therapy towards the treatment approaches of tension-type headaches has become the driving force for writing this article. Methodology: Studies comparing the effects of physical therapy management with conventional treatment approaches are included in the meta-analysis. PRISMA guidelines were used for performing the qualitative analysis and assessment of risk of biases. Results: According to the findings of nine randomized controlled trials, the analysis of the results had revealed that physical therapy intervention demonstrated a significant improvement in reducing headache severity. In a random effect model, the pool effects of physical therapy strategies in terms of Standardized Mean Difference had an impact of 1.41, which according to a Cohen rule of thumb displays a larger effect of physical therapy management in significant decrease in pain intensity among tension-type headache patients Conclusion: The study has concluded that physical therapy-based management strategies as provided in several RCTs analyzed in this review article revealed a pool effect of moderate size in managing the frequency of pain and a larger effect size in managing pain intensity and duration. Further, it was concluded that tension-type headaches can be effectively managed through physical therapy-based approaches.

Design, Fabrication and Performance Evaluation of an Agro-Dryer for Drying Agro-Commodities

Muhammad Saleh Soomro Ph.D. Power and Machmery Engineering "Design. Fabrication and Performance Evaluation of an Agro-dryer for Drying Agro-commoditles" "7ne pUf:JOS€ Of thiS stuay vIas to aeslgn faoflcate anc les: a~ ag~''" C0-''''''· tor crvlng a9ro-commodltles in.tlailY a surve~'' was cona~clea lO IQam,;) vmlC:1 CQr:1mOOltles are arlea loca~r} ana \''.'',a~ r:1e:i1QCS were aoomec Ir ej ..... ,'':ng Thereafter a:ye~ aeSlgns Ir use Ir, vanous Dans of tne world were r,o~v,ewed and a su:tab!e deslg:l was selectee ~or 1tle DfotOiyoe Mal eOl1ohasls was given In oeSlgnlng a Simole macnlr.e to De maae from loca!" availaoie malenalS ana manufact<...!nng technology Iriormatlon gathered '':or. 200 respondents tndlcaieo tha: local-y'' cerea~s_ iegU:719S conOlmeniS fruits. vege:anies medicinal pial"lts. hay ana fodder TISi: ana mea: are arlec mostiy ;.., eDen air or uncer snade Ooen air-drying was repOilea as tne mos: ~'')mmon metlloa of orylng agro-commooltles T1e :armers were nOt na:)p,'' .v~t~ uncontroileo open ai'' methoo a~: aeslred 1.e ces''~., a Slm:)le a'',c easy to 50''- law cost dryer sur;C1n!e j.;)r 0,\'':n·1 2''1Y agrO-C~)f;1:''10dl:y H'' a ("'':e8:'' or clau,:y ~ "''y aav A orOWlype drier v.as aesr'':::''1€:: rna: l:se:J D":"''" a.rect ana Inc re:c:: 50,a IE:'': II· conJL: c;lon vn:1 a :), IV:S~;:i ":G~ c~yl;; ;"''"''·3:e-2:s \ViP"'' S,- ''-~;o::::ts , .. .In:je~ II -:;;:ne;l~ weather CO:1ClI:lons 11ltia:1y t~e c·:.-·er v:as ;e5!ed Unoei three drYlfl" :-"''""IC·'':::~S \'' orye. alone til) Orye~ \\·Fl DOQSter El1:) 1111) open alr<Y·~·ln:::: 3.~ :or~rOi) on Chilies and rase f10\"2~S Results lno.catea :ha: d~yer-:)oQsti r <,;omDlnailon removed tne prod~;G rlOIS:>JrE- very CJlckly fo!''c\.'':ea by c-Yt=.: 1Io:''c w:111e open alf took double the orylng :''.r""1e as compared to dryer r:lodes HaVing gamed ine confide~ce on the cry·;:::- performance ce:3!ied tes.ts /I,=~e conaucted to stuay me e--:e.::::s ct lOur ary:ng modes dryer alone driEr DOaSter charcoal heating and open air forced air convection [at night] ~r3y sr.I''Ilng and material layer Inlckness on Ihe oryer pertormance Tes:~ Ind:cated that drier alone removed 1 6 to 3 OC/~ mOlst>Jre/hour f~orr Chili ~ C8:;..llflower and green peas as CO:Toare-: iO Jt..:S~ '' ... ~ per hour In open a:r However f~am rose flowers 5-1 OS~ mlhr was removed In dryer mode wt"l, E c:·~n-Cllr moae removed 3-''h~ m/nr Thus the a~lng time reqUired IP C:""'',£": modes was more Of less half of that requlrec In op~n-alr C''Ylng Dryer modes unde, 7:)!"";:::ed air convection [at nlgnt: remov~; s:;n,:,cantly more mOisture compared to open-air moce Shifting of liS,. ~ however hao no significant effect In !irS; iWO aays but on third ana "ourt/1 c;;;:. the e7iect was slgmflcant. MOisture removed from ::llck layer of commod.:.~<" unoer forced air convection In d;yer moces Vias Significantly higher pc: cOr:1~ared to open-air mode Charcoal heating was as effective as the soia: drymg 90 kg of vegetables were dned uSing one oag Of charcoa'' oay In A days Calculations on me calorific value and drying efficiency confirmed tnat G kg charcoal would deliver 5 3 M~I of energy I hour and a 40 kg bag of charcoal was enougn for one day The farmer may use thiS option on a rainY or clouoy oay In a s;ackea lray arrangement tne too trays cried Significantly fasle~ lIlan tne trays ola::eo 0810W t~e tOP trays I; was oeservec rna: In a StacK 0'' G trays tne top tray removed 36% secane tray ''11.>,; 8r''lC tnlrd trav 41:i. more mo!sture comoarea to tne ::-8,. placeo a: !ne Doner Cnilles a: full load wnen orled In aDen-ali reO''Jlreo 40°,.: more [lme as com oared [0 the aryer mooes A: P811 load open alr-arylng [Ook "''75 10 -;33°,,., more time 2S comparee to dryer modes In rose flowers 100% more time was requlrea In aDen al~-orylng tnan the aryer-boosle~ mode Cauliflower when Cried In ooen al;" required 50% more time under natural air canveC[1on ano 100% more time In forced air convection as comparec to oryer mode Similar treno was nmea In green Deas ana cniiles In StaCK tests MOisture removal !rom Chilies CGullfiower and green peas 0/1 dally baSIS Indicated tna: cUr.1ulauvely 40°''0 mOisture escaped on first day 69% on second day ana 89% on third day In aryer modes wnereas 30''/0 on firs: day 56% on secona cay and 76% on third Gay In open-air aryln;: mace Thus the drye~ moaes remov9G slgmficantly mo~e mOisture than tne open·al~ mode The temDerature Inside the dryer at high mOisture ratio was less due ;:0 heavy mOisture load InSloe the dryer As tne mOisture raIlO staned dec:-easil''lg wltn progress In o''Ylng process mus the te~pe:-ature SimultaneouslY energized tne d-Ylng process Conversely tne rela:''ve humidity remained h''gr 1:151de rhe dryer at higher mOisture ratiO As the drymg process progressed the mOisture ratio decreasea and consequentlY the reiatlve humidity oroopec.; sharply to a minimum, Temperature and humIdity snowed a Similar respons~ In green peas and chilies The ratmg of organole:::>tlc marenals dried In dryer With solar or charceal heat was between good and excellent while the matenals aned In open air were rated betvveen poor and fair Two models were developed to predict the rate o~ mOisture removal With crying time The empIrical model based on the mOisture removal - time relationship yielded predication eauatlons of logantnmlc form that best fitted t,- the expenmental values with R2 ranging from 091 to a 99 Another mathematIcal model usee mOisture rs:io - time relationship. also Yielded prediction ecuatlons of exponenllal form that also very accurately matchea WIth the exoenmental results With R2 approaching unity A Simple dryer deSIgn IS suggested for farmers WIth babul wood frame and a polyetnylene shee: transparent cover The cost of the suggested dryer IS affordaole. ensuring a better product qt.:atlty