{"id":"https://openalex.org/W2347117091","doi":"https://doi.org/10.1109/expat.2015.7463284","title":"An alternative methodology for the estimation of frequency changes in electroencephalogram signals","display_name":"An alternative methodology for the estimation of frequency changes in electroencephalogram signals","publication_year":2015,"publication_date":"2015-06-01","ids":{"openalex":"https://openalex.org/W2347117091","doi":"https://doi.org/10.1109/expat.2015.7463284","mag":"2347117091"},"language":"en","primary_location":{"id":"doi:10.1109/expat.2015.7463284","is_oa":false,"landing_page_url":"https://doi.org/10.1109/expat.2015.7463284","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2015 3rd Experiment International Conference (exp.at'15)","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5010197657","display_name":"C\u00e9sar Teixeira","orcid":"https://orcid.org/0000-0001-9396-1211"},"institutions":[{"id":"https://openalex.org/I76903346","display_name":"University of Coimbra","ror":"https://ror.org/04z8k9a98","country_code":"PT","type":"education","lineage":["https://openalex.org/I76903346"]}],"countries":["PT"],"is_corresponding":true,"raw_author_name":"Cesar Teixeira","raw_affiliation_strings":["CISUC-University of Coimbra, DEI, Coimbra, Portugal"],"affiliations":[{"raw_affiliation_string":"CISUC-University of Coimbra, DEI, Coimbra, Portugal","institution_ids":["https://openalex.org/I76903346"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5026481811","display_name":"Alberto Cardoso","orcid":"https://orcid.org/0000-0003-1824-1075"},"institutions":[{"id":"https://openalex.org/I76903346","display_name":"University of Coimbra","ror":"https://ror.org/04z8k9a98","country_code":"PT","type":"education","lineage":["https://openalex.org/I76903346"]}],"countries":["PT"],"is_corresponding":false,"raw_author_name":"Alberto Cardoso","raw_affiliation_strings":["CISUC-University of Coimbra, DEI, Coimbra, Portugal"],"affiliations":[{"raw_affiliation_string":"CISUC-University of Coimbra, DEI, Coimbra, Portugal","institution_ids":["https://openalex.org/I76903346"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5055127085","display_name":"Maria Piedade Costa Gomes","orcid":null},"institutions":[{"id":"https://openalex.org/I2802025818","display_name":"Hospitais da Universidade de Coimbra","ror":"https://ror.org/04032fz76","country_code":"PT","type":"healthcare","lineage":["https://openalex.org/I2802025818"]}],"countries":["PT"],"is_corresponding":false,"raw_author_name":"Maria Piedade Costa Gomes","raw_affiliation_strings":["Centro Hospitalar e Universit\u00e1rio de Coimbra, Coimbra, Portugal"],"affiliations":[{"raw_affiliation_string":"Centro Hospitalar e Universit\u00e1rio de Coimbra, Coimbra, Portugal","institution_ids":["https://openalex.org/I2802025818"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5083958408","display_name":"Francisco Sales","orcid":null},"institutions":[{"id":"https://openalex.org/I2802025818","display_name":"Hospitais da Universidade de Coimbra","ror":"https://ror.org/04032fz76","country_code":"PT","type":"healthcare","lineage":["https://openalex.org/I2802025818"]}],"countries":["PT"],"is_corresponding":false,"raw_author_name":"Francisco Sales","raw_affiliation_strings":["Centro Hospitalar e Universit\u00e1rio de Coimbra, Coimbra, Portugal"],"affiliations":[{"raw_affiliation_string":"Centro Hospitalar e Universit\u00e1rio de Coimbra, Coimbra, Portugal","institution_ids":["https://openalex.org/I2802025818"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5059952617","display_name":"Ant\u00f3nio Dourado","orcid":"https://orcid.org/0000-0002-5445-6893"},"institutions":[{"id":"https://openalex.org/I2802025818","display_name":"Hospitais da Universidade de Coimbra","ror":"https://ror.org/04032fz76","country_code":"PT","type":"healthcare","lineage":["https://openalex.org/I2802025818"]}],"countries":["PT"],"is_corresponding":false,"raw_author_name":"Antonio Dourado","raw_affiliation_strings":["Centro Hospitalar e Universit\u00e1rio de Coimbra, Coimbra, Portugal"],"affiliations":[{"raw_affiliation_string":"Centro Hospitalar e Universit\u00e1rio de Coimbra, Coimbra, Portugal","institution_ids":["https://openalex.org/I2802025818"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":5,"corresponding_author_ids":["https://openalex.org/A5010197657"],"corresponding_institution_ids":["https://openalex.org/I76903346"],"apc_list":null,"apc_paid":null,"fwci":0.1613,"has_fulltext":false,"cited_by_count":1,"citation_normalized_percentile":{"value":0.55387864,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":94},"biblio":{"volume":"89","issue":null,"first_page":"302","last_page":"305"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10429","display_name":"EEG and Brain-Computer Interfaces","score":0.9955999851226807,"subfield":{"id":"https://openalex.org/subfields/2805","display_name":"Cognitive Neuroscience"},"field":{"id":"https://openalex.org/fields/28","display_name":"Neuroscience"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},"topics":[{"id":"https://openalex.org/T10429","display_name":"EEG and Brain-Computer Interfaces","score":0.9955999851226807,"subfield":{"id":"https://openalex.org/subfields/2805","display_name":"Cognitive Neuroscience"},"field":{"id":"https://openalex.org/fields/28","display_name":"Neuroscience"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10436","display_name":"Anesthesia and Sedative Agents","score":0.9843999743461609,"subfield":{"id":"https://openalex.org/subfields/2703","display_name":"Anesthesiology and Pain Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T13248","display_name":"Healthcare Technology and Patient Monitoring","score":0.9835000038146973,"subfield":{"id":"https://openalex.org/subfields/2746","display_name":"Surgery"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/phase-locked-loop","display_name":"Phase-locked loop","score":0.7816383838653564},{"id":"https://openalex.org/keywords/voltage-controlled-oscillator","display_name":"Voltage-controlled oscillator","score":0.7474761009216309},{"id":"https://openalex.org/keywords/frequency-domain","display_name":"Frequency domain","score":0.6624314785003662},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6414716839790344},{"id":"https://openalex.org/keywords/automatic-frequency-control","display_name":"Automatic frequency control","score":0.5837269425392151},{"id":"https://openalex.org/keywords/lock","display_name":"Lock (firearm)","score":0.5000350475311279},{"id":"https://openalex.org/keywords/range","display_name":"Range (aeronautics)","score":0.4885023832321167},{"id":"https://openalex.org/keywords/time\u2013frequency-analysis","display_name":"Time\u2013frequency analysis","score":0.44969823956489563},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.42352184653282166},{"id":"https://openalex.org/keywords/electroencephalography","display_name":"Electroencephalography","score":0.42324337363243103},{"id":"https://openalex.org/keywords/frequency-synthesizer","display_name":"Frequency synthesizer","score":0.4174349904060364},{"id":"https://openalex.org/keywords/signal","display_name":"SIGNAL (programming language)","score":0.41585808992385864},{"id":"https://openalex.org/keywords/control-theory","display_name":"Control theory (sociology)","score":0.3614470958709717},{"id":"https://openalex.org/keywords/voltage","display_name":"Voltage","score":0.286770224571228},{"id":"https://openalex.org/keywords/control","display_name":"Control (management)","score":0.2606099247932434},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.237934410572052},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.1907188594341278},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.18405964970588684},{"id":"https://openalex.org/keywords/electrical-engineering","display_name":"Electrical engineering","score":0.1301446557044983},{"id":"https://openalex.org/keywords/computer-vision","display_name":"Computer vision","score":0.10500171780586243}],"concepts":[{"id":"https://openalex.org/C12707504","wikidata":"https://www.wikidata.org/wiki/Q52637","display_name":"Phase-locked loop","level":3,"score":0.7816383838653564},{"id":"https://openalex.org/C5291336","wikidata":"https://www.wikidata.org/wiki/Q852341","display_name":"Voltage-controlled oscillator","level":3,"score":0.7474761009216309},{"id":"https://openalex.org/C19118579","wikidata":"https://www.wikidata.org/wiki/Q786423","display_name":"Frequency domain","level":2,"score":0.6624314785003662},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6414716839790344},{"id":"https://openalex.org/C25915539","wikidata":"https://www.wikidata.org/wiki/Q220786","display_name":"Automatic frequency control","level":2,"score":0.5837269425392151},{"id":"https://openalex.org/C174839445","wikidata":"https://www.wikidata.org/wiki/Q1134386","display_name":"Lock (firearm)","level":2,"score":0.5000350475311279},{"id":"https://openalex.org/C204323151","wikidata":"https://www.wikidata.org/wiki/Q905424","display_name":"Range (aeronautics)","level":2,"score":0.4885023832321167},{"id":"https://openalex.org/C142433447","wikidata":"https://www.wikidata.org/wiki/Q7806653","display_name":"Time\u2013frequency analysis","level":3,"score":0.44969823956489563},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.42352184653282166},{"id":"https://openalex.org/C522805319","wikidata":"https://www.wikidata.org/wiki/Q179965","display_name":"Electroencephalography","level":2,"score":0.42324337363243103},{"id":"https://openalex.org/C182099602","wikidata":"https://www.wikidata.org/wiki/Q2660678","display_name":"Frequency synthesizer","level":4,"score":0.4174349904060364},{"id":"https://openalex.org/C2779843651","wikidata":"https://www.wikidata.org/wiki/Q7390335","display_name":"SIGNAL (programming language)","level":2,"score":0.41585808992385864},{"id":"https://openalex.org/C47446073","wikidata":"https://www.wikidata.org/wiki/Q5165890","display_name":"Control theory (sociology)","level":3,"score":0.3614470958709717},{"id":"https://openalex.org/C165801399","wikidata":"https://www.wikidata.org/wiki/Q25428","display_name":"Voltage","level":2,"score":0.286770224571228},{"id":"https://openalex.org/C2775924081","wikidata":"https://www.wikidata.org/wiki/Q55608371","display_name":"Control (management)","level":2,"score":0.2606099247932434},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.237934410572052},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.1907188594341278},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.18405964970588684},{"id":"https://openalex.org/C119599485","wikidata":"https://www.wikidata.org/wiki/Q43035","display_name":"Electrical engineering","level":1,"score":0.1301446557044983},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.10500171780586243},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.0},{"id":"https://openalex.org/C78519656","wikidata":"https://www.wikidata.org/wiki/Q101333","display_name":"Mechanical engineering","level":1,"score":0.0},{"id":"https://openalex.org/C15744967","wikidata":"https://www.wikidata.org/wiki/Q9418","display_name":"Psychology","level":0,"score":0.0},{"id":"https://openalex.org/C146978453","wikidata":"https://www.wikidata.org/wiki/Q3798668","display_name":"Aerospace engineering","level":1,"score":0.0},{"id":"https://openalex.org/C118552586","wikidata":"https://www.wikidata.org/wiki/Q7867","display_name":"Psychiatry","level":1,"score":0.0},{"id":"https://openalex.org/C134652429","wikidata":"https://www.wikidata.org/wiki/Q1052698","display_name":"Jitter","level":2,"score":0.0},{"id":"https://openalex.org/C554190296","wikidata":"https://www.wikidata.org/wiki/Q47528","display_name":"Radar","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/expat.2015.7463284","is_oa":false,"landing_page_url":"https://doi.org/10.1109/expat.2015.7463284","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2015 3rd Experiment International Conference (exp.at'15)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Life below water","score":0.5199999809265137,"id":"https://metadata.un.org/sdg/14"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":7,"referenced_works":["https://openalex.org/W1486715499","https://openalex.org/W2003352387","https://openalex.org/W2062918839","https://openalex.org/W2080601119","https://openalex.org/W2153134014","https://openalex.org/W2153230907","https://openalex.org/W2165878107"],"related_works":["https://openalex.org/W2070109416","https://openalex.org/W1523213765","https://openalex.org/W2040399070","https://openalex.org/W2388316590","https://openalex.org/W4388486464","https://openalex.org/W2902200568","https://openalex.org/W2380576078","https://openalex.org/W2774664569","https://openalex.org/W2402088482","https://openalex.org/W2371165954"],"abstract_inverted_index":{"We":[0,57],"present":[1],"a":[2,22,45,50,118,143],"novel":[3],"methodology":[4,113],"based":[5,20],"on":[6,21,61,126],"communication":[7],"systems,":[8],"able":[9],"to":[10,89,108],"track":[11],"frequency":[12,36,64,74,151],"changes":[13,83],"in":[14,100,137,153],"biosignals.":[15],"The":[16,38,95,111,133],"proposed":[17,39],"approach":[18,97],"is":[19,114,135],"phase":[23],"lock":[24],"loop":[25],"(PLL)":[26],"circuit":[27],"and":[28,84,149,159],"includes":[29],"subcomponents":[30],"that":[31,59,82],"allow":[32],"the":[33,62,66,70,78,90,124,154],"estimation":[34],"of":[35,54,65,80,92,131],"variations.":[37],"system":[40,134],"can":[41],"be":[42],"modeled":[43],"as":[44,117],"second-order":[46],"control":[47,146],"system,":[48],"enabling":[49],"strait":[51],"forward":[52],"definition":[53],"its":[55],"parameters.":[56],"found":[58],"depending":[60],"initial":[63],"voltage-controlled":[67],"oscillator":[68],"(VCO)":[69],"PLL":[71],"tracks":[72],"different":[73],"components,":[75],"allowing":[76],"assessing":[77],"range":[79],"frequencies":[81],"how":[85,142,150],"they":[86],"change,":[87],"leading":[88],"development":[91],"time-frequency":[93,155],"maps.":[94],"new":[96],"was":[98],"tested":[99],"Electroencephalogram":[101],"(EEG)":[102],"signals":[103],"collected":[104],"from":[105,123],"patients":[106],"subjected":[107],"general":[109],"anesthesia.":[110],"developed":[112],"available":[115],"online":[116],"demonstration":[119],"tool":[120],"for":[121],"students":[122],"Master":[125],"Biomedical":[127],"Engineering":[128],"at":[129],"University":[130],"Coimbra.":[132],"didactic":[136],"two":[138],"ways:":[139],"it":[140],"demonstrates":[141],"second":[144],"order":[145],"systems":[147],"works,":[148],"variations":[152],"domain":[156],"are":[157],"computed":[158],"their":[160],"importance.":[161]},"counts_by_year":[{"year":2018,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}