{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:OH7OTJ3P4N7OWQYTPZLJW4LGZT","short_pith_number":"pith:OH7OTJ3P","schema_version":"1.0","canonical_sha256":"71fee9a76fe37eeb43137e569b7166cceae3f970d1d1a293f39a0a674daf3052","source":{"kind":"arxiv","id":"2105.13476","version":1},"attestation_state":"computed","paper":{"title":"The Complex-Pole Filter Representation (COFRE) for spectral modeling of fNIRS signals","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["physics.med-ph","stat.ME"],"primary_cat":"q-bio.QM","authors_text":"Hugo L. Hammer, Marco A. Pinto Orellana, Peyman Mirtaheri","submitted_at":"2021-05-13T16:42:00Z","abstract_excerpt":"The complex-pole frequency representation (COFRE) is introduced in this paper as a new approach for spectrum modeling in biomedical signals. Our method allows us to estimate the spectral power density at precise frequencies using an array of narrow band-pass filters with single complex poles. Closed-form expressions for the frequency resolution and transient time response of the proposed filters have also been formulated. In addition, COFRE filters have a constant time and space complexity allowing their use in real-time environments. Our model was applied to identify frequency markers that ch"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2105.13476","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"q-bio.QM","submitted_at":"2021-05-13T16:42:00Z","cross_cats_sorted":["physics.med-ph","stat.ME"],"title_canon_sha256":"6c260299b5cd9eb15e3ac7f4c8d60194e724e9e0e700d2610e56889e2c5d5454","abstract_canon_sha256":"b12399d10ac6816cf8f8ccacc83d74874afe7f81084db3bb1cf4260b6a1e7ecd"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:44:08.387433Z","signature_b64":"4uEcOq1iNs1rqN8FW1m2OozAwJsnk9UJKlg6Tvndm23YTzUhVL0qViDfdExkSc+AZ+1nqHHNjkCtSMegaIJvDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"71fee9a76fe37eeb43137e569b7166cceae3f970d1d1a293f39a0a674daf3052","last_reissued_at":"2026-07-05T02:44:08.387079Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:44:08.387079Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Complex-Pole Filter Representation (COFRE) for spectral modeling of fNIRS signals","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["physics.med-ph","stat.ME"],"primary_cat":"q-bio.QM","authors_text":"Hugo L. Hammer, Marco A. Pinto Orellana, Peyman Mirtaheri","submitted_at":"2021-05-13T16:42:00Z","abstract_excerpt":"The complex-pole frequency representation (COFRE) is introduced in this paper as a new approach for spectrum modeling in biomedical signals. Our method allows us to estimate the spectral power density at precise frequencies using an array of narrow band-pass filters with single complex poles. Closed-form expressions for the frequency resolution and transient time response of the proposed filters have also been formulated. In addition, COFRE filters have a constant time and space complexity allowing their use in real-time environments. Our model was applied to identify frequency markers that ch"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.13476","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2105.13476/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2105.13476","created_at":"2026-07-05T02:44:08.387132+00:00"},{"alias_kind":"arxiv_version","alias_value":"2105.13476v1","created_at":"2026-07-05T02:44:08.387132+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.13476","created_at":"2026-07-05T02:44:08.387132+00:00"},{"alias_kind":"pith_short_12","alias_value":"OH7OTJ3P4N7O","created_at":"2026-07-05T02:44:08.387132+00:00"},{"alias_kind":"pith_short_16","alias_value":"OH7OTJ3P4N7OWQYT","created_at":"2026-07-05T02:44:08.387132+00:00"},{"alias_kind":"pith_short_8","alias_value":"OH7OTJ3P","created_at":"2026-07-05T02:44:08.387132+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT","json":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT.json","graph_json":"https://pith.science/api/pith-number/OH7OTJ3P4N7OWQYTPZLJW4LGZT/graph.json","events_json":"https://pith.science/api/pith-number/OH7OTJ3P4N7OWQYTPZLJW4LGZT/events.json","paper":"https://pith.science/paper/OH7OTJ3P"},"agent_actions":{"view_html":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT","download_json":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT.json","view_paper":"https://pith.science/paper/OH7OTJ3P","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2105.13476&json=true","fetch_graph":"https://pith.science/api/pith-number/OH7OTJ3P4N7OWQYTPZLJW4LGZT/graph.json","fetch_events":"https://pith.science/api/pith-number/OH7OTJ3P4N7OWQYTPZLJW4LGZT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT/action/storage_attestation","attest_author":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT/action/author_attestation","sign_citation":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT/action/citation_signature","submit_replication":"https://pith.science/pith/OH7OTJ3P4N7OWQYTPZLJW4LGZT/action/replication_record"}},"created_at":"2026-07-05T02:44:08.387132+00:00","updated_at":"2026-07-05T02:44:08.387132+00:00"}