{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:P763GJ4VW3ZCTYI7NW2OHJSBNV","short_pith_number":"pith:P763GJ4V","canonical_record":{"source":{"id":"1509.00533","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2015-09-02T00:31:40Z","cross_cats_sorted":["cs.CL","stat.AP"],"title_canon_sha256":"61783b63a15bc625e01b0496495b1affe9fee1c66242818dece2b0b71daf6762","abstract_canon_sha256":"69e19a0519ee03d4e3a335f8c468103f72d705180e2d6c22d433447f0a88f66f"},"schema_version":"1.0"},"canonical_sha256":"7ffdb32795b6f229e11f6db4e3a6416d51e0931661159277fa88ec0d6defee69","source":{"kind":"arxiv","id":"1509.00533","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.00533","created_at":"2026-05-18T01:34:06Z"},{"alias_kind":"arxiv_version","alias_value":"1509.00533v1","created_at":"2026-05-18T01:34:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00533","created_at":"2026-05-18T01:34:06Z"},{"alias_kind":"pith_short_12","alias_value":"P763GJ4VW3ZC","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"P763GJ4VW3ZCTYI7","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"P763GJ4V","created_at":"2026-05-18T12:29:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:P763GJ4VW3ZCTYI7NW2OHJSBNV","target":"record","payload":{"canonical_record":{"source":{"id":"1509.00533","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2015-09-02T00:31:40Z","cross_cats_sorted":["cs.CL","stat.AP"],"title_canon_sha256":"61783b63a15bc625e01b0496495b1affe9fee1c66242818dece2b0b71daf6762","abstract_canon_sha256":"69e19a0519ee03d4e3a335f8c468103f72d705180e2d6c22d433447f0a88f66f"},"schema_version":"1.0"},"canonical_sha256":"7ffdb32795b6f229e11f6db4e3a6416d51e0931661159277fa88ec0d6defee69","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:34:06.926419Z","signature_b64":"BieSh9FYuYe1tsN4AD/rF5SlBLTJg4LP5NSCArLMvoaAYe1sI1il6QD7+bJv2VKUxBTMzyiGbi+a4Sg8URDnCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ffdb32795b6f229e11f6db4e3a6416d51e0931661159277fa88ec0d6defee69","last_reissued_at":"2026-05-18T01:34:06.925731Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:34:06.925731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.00533","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:34:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"71pE3MpOxDY+AIwXeS1xBtna3QB76BJ05JsiC+BYP2dsxitpFiKBMxoxG8qqeNl4xWJM5pMuwRIsW7qKhA/mCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T10:00:49.458999Z"},"content_sha256":"c04ef91d8b81882ed36d1540159346702d63ae2de286640fe46bcc41cf6df133","schema_version":"1.0","event_id":"sha256:c04ef91d8b81882ed36d1540159346702d63ae2de286640fe46bcc41cf6df133"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:P763GJ4VW3ZCTYI7NW2OHJSBNV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Enhancement and Recognition of Reverberant and Noisy Speech by Extending Its Coherence","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CL","stat.AP"],"primary_cat":"cs.SD","authors_text":"James Pitton, Les Atlas, Scott Wisdom, Thomas Powers","submitted_at":"2015-09-02T00:31:40Z","abstract_excerpt":"Most speech enhancement algorithms make use of the short-time Fourier transform (STFT), which is a simple and flexible time-frequency decomposition that estimates the short-time spectrum of a signal. However, the duration of short STFT frames are inherently limited by the nonstationarity of speech signals. The main contribution of this paper is a demonstration of speech enhancement and automatic speech recognition in the presence of reverberation and noise by extending the length of analysis windows. We accomplish this extension by performing enhancement in the short-time fan-chirp transform ("},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00533","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:34:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vM7dgWph4c3THeJgE18n4aPVyhVU4bhpV80GlFZlWS3d3f6xddpWiVbpdBhN3TXJKMdS44akCbFYoopFDr4oCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T10:00:49.459360Z"},"content_sha256":"162b1530e67765ea2f6d9bb1c1b1048d17220597c908f2675630e2935537d3b4","schema_version":"1.0","event_id":"sha256:162b1530e67765ea2f6d9bb1c1b1048d17220597c908f2675630e2935537d3b4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P763GJ4VW3ZCTYI7NW2OHJSBNV/bundle.json","state_url":"https://pith.science/pith/P763GJ4VW3ZCTYI7NW2OHJSBNV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P763GJ4VW3ZCTYI7NW2OHJSBNV/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-05T10:00:49Z","links":{"resolver":"https://pith.science/pith/P763GJ4VW3ZCTYI7NW2OHJSBNV","bundle":"https://pith.science/pith/P763GJ4VW3ZCTYI7NW2OHJSBNV/bundle.json","state":"https://pith.science/pith/P763GJ4VW3ZCTYI7NW2OHJSBNV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P763GJ4VW3ZCTYI7NW2OHJSBNV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:P763GJ4VW3ZCTYI7NW2OHJSBNV","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":"69e19a0519ee03d4e3a335f8c468103f72d705180e2d6c22d433447f0a88f66f","cross_cats_sorted":["cs.CL","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2015-09-02T00:31:40Z","title_canon_sha256":"61783b63a15bc625e01b0496495b1affe9fee1c66242818dece2b0b71daf6762"},"schema_version":"1.0","source":{"id":"1509.00533","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.00533","created_at":"2026-05-18T01:34:06Z"},{"alias_kind":"arxiv_version","alias_value":"1509.00533v1","created_at":"2026-05-18T01:34:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00533","created_at":"2026-05-18T01:34:06Z"},{"alias_kind":"pith_short_12","alias_value":"P763GJ4VW3ZC","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"P763GJ4VW3ZCTYI7","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"P763GJ4V","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:162b1530e67765ea2f6d9bb1c1b1048d17220597c908f2675630e2935537d3b4","target":"graph","created_at":"2026-05-18T01:34:06Z","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":"Most speech enhancement algorithms make use of the short-time Fourier transform (STFT), which is a simple and flexible time-frequency decomposition that estimates the short-time spectrum of a signal. However, the duration of short STFT frames are inherently limited by the nonstationarity of speech signals. The main contribution of this paper is a demonstration of speech enhancement and automatic speech recognition in the presence of reverberation and noise by extending the length of analysis windows. We accomplish this extension by performing enhancement in the short-time fan-chirp transform (","authors_text":"James Pitton, Les Atlas, Scott Wisdom, Thomas Powers","cross_cats":["cs.CL","stat.AP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2015-09-02T00:31:40Z","title":"Enhancement and Recognition of Reverberant and Noisy Speech by Extending Its Coherence"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00533","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:c04ef91d8b81882ed36d1540159346702d63ae2de286640fe46bcc41cf6df133","target":"record","created_at":"2026-05-18T01:34:06Z","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":"69e19a0519ee03d4e3a335f8c468103f72d705180e2d6c22d433447f0a88f66f","cross_cats_sorted":["cs.CL","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2015-09-02T00:31:40Z","title_canon_sha256":"61783b63a15bc625e01b0496495b1affe9fee1c66242818dece2b0b71daf6762"},"schema_version":"1.0","source":{"id":"1509.00533","kind":"arxiv","version":1}},"canonical_sha256":"7ffdb32795b6f229e11f6db4e3a6416d51e0931661159277fa88ec0d6defee69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ffdb32795b6f229e11f6db4e3a6416d51e0931661159277fa88ec0d6defee69","first_computed_at":"2026-05-18T01:34:06.925731Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:34:06.925731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BieSh9FYuYe1tsN4AD/rF5SlBLTJg4LP5NSCArLMvoaAYe1sI1il6QD7+bJv2VKUxBTMzyiGbi+a4Sg8URDnCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:34:06.926419Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.00533","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c04ef91d8b81882ed36d1540159346702d63ae2de286640fe46bcc41cf6df133","sha256:162b1530e67765ea2f6d9bb1c1b1048d17220597c908f2675630e2935537d3b4"],"state_sha256":"e6e9e80852cacc8378e51fa732333609dcf12daae8dcfd57c8291ef95d334943"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ihiGAHtIKDoyLvzNEB4H6diyRlc2s8IHFK5HfvN9dFW7S5XKFCo5RvZ/Nnm3X+JHQ4KvPoACOvUSgVN9IODCDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T10:00:49.461266Z","bundle_sha256":"fc865888924826e4da3aeb8455c2d8293a19903ebc014bc109e5eee494f52c07"}}