{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:SIVNQKUX37Z3Q2K26G3RQYSWGT","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"88b726c0b46c2cf5f50fd15c026fa7585d2e3fd61963a4a90cdc19c2d8108304","cross_cats_sorted":["cs.SD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2019-04-05T15:54:38Z","title_canon_sha256":"b0d5041ce3c4b7a3fcce2f6ef01e326ddcf7a41846b3553b19b5e27e193a64c7"},"schema_version":"1.0","source":{"id":"1904.03130","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.03130","created_at":"2026-05-17T23:49:18Z"},{"alias_kind":"arxiv_version","alias_value":"1904.03130v1","created_at":"2026-05-17T23:49:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.03130","created_at":"2026-05-17T23:49:18Z"},{"alias_kind":"pith_short_12","alias_value":"SIVNQKUX37Z3","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"SIVNQKUX37Z3Q2K2","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"SIVNQKUX","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:a0a3301f5575252971e659778aee04b788226511dd86a32e2f29cd6958b86eb2","target":"graph","created_at":"2026-05-17T23:49:18Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In this paper, we present RT-GCC-NMF: a real-time (RT), two-channel blind speech enhancement algorithm that combines the non-negative matrix factorization (NMF) dictionary learning algorithm with the generalized cross-correlation (GCC) spatial localization method. Using a pre-learned universal NMF dictionary, RT-GCC-NMF operates in a frame-by-frame fashion by associating individual dictionary atoms to target speech or background interference based on their estimated time-delay of arrivals (TDOA). We evaluate RT-GCC-NMF on two-channel mixtures of speech and real-world noise from the Signal Sepa","authors_text":"Jean Rouat, Sean U. N. Wood","cross_cats":["cs.SD"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2019-04-05T15:54:38Z","title":"Unsupervised Low Latency Speech Enhancement with RT-GCC-NMF"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.03130","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:17e7afb15995220cd0258d2e0bea11809d3e129fc863bfcaea3caf52efffb2b5","target":"record","created_at":"2026-05-17T23:49:18Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"88b726c0b46c2cf5f50fd15c026fa7585d2e3fd61963a4a90cdc19c2d8108304","cross_cats_sorted":["cs.SD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2019-04-05T15:54:38Z","title_canon_sha256":"b0d5041ce3c4b7a3fcce2f6ef01e326ddcf7a41846b3553b19b5e27e193a64c7"},"schema_version":"1.0","source":{"id":"1904.03130","kind":"arxiv","version":1}},"canonical_sha256":"922ad82a97dff3b8695af1b718625634c008a1b5e0bdc4688d8cc99a330e15b6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"922ad82a97dff3b8695af1b718625634c008a1b5e0bdc4688d8cc99a330e15b6","first_computed_at":"2026-05-17T23:49:18.488434Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:18.488434Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+tRgyob7wOjmTt53UmKKrGE72t4hUdaHdvBlhqsNMt0Q52x991tbV3BUD3XqI3j/fB9oIBRxauPpspQY5qSFCw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:18.489080Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.03130","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:17e7afb15995220cd0258d2e0bea11809d3e129fc863bfcaea3caf52efffb2b5","sha256:a0a3301f5575252971e659778aee04b788226511dd86a32e2f29cd6958b86eb2"],"state_sha256":"45f6ad435a74f4235097e4b8aa2a6c9f6272982f0063b735c12393c3b45390f0"}