{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:ZS5K232WFIHQSHRUJO7ETYFID6","short_pith_number":"pith:ZS5K232W","canonical_record":{"source":{"id":"1605.01329","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2016-05-04T16:16:12Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"3143e1ef626281242b258f93f5b0f1a0df0e2f2afd10f400df55b4a3e14582ee","abstract_canon_sha256":"f6c90687ae88eb7a2f29104e1e2c466589988eca9ec70c69a381005a723951c8"},"schema_version":"1.0"},"canonical_sha256":"ccbaad6f562a0f091e344bbe49e0a81fb80ab8f8b1fda520d6d5206318e9e47c","source":{"kind":"arxiv","id":"1605.01329","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.01329","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"arxiv_version","alias_value":"1605.01329v1","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.01329","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZS5K232WFIHQ","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZS5K232WFIHQSHRU","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZS5K232W","created_at":"2026-05-18T12:30:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:ZS5K232WFIHQSHRUJO7ETYFID6","target":"record","payload":{"canonical_record":{"source":{"id":"1605.01329","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2016-05-04T16:16:12Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"3143e1ef626281242b258f93f5b0f1a0df0e2f2afd10f400df55b4a3e14582ee","abstract_canon_sha256":"f6c90687ae88eb7a2f29104e1e2c466589988eca9ec70c69a381005a723951c8"},"schema_version":"1.0"},"canonical_sha256":"ccbaad6f562a0f091e344bbe49e0a81fb80ab8f8b1fda520d6d5206318e9e47c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:31.762207Z","signature_b64":"UzGhHoF2retrSfGqhrMtXN6nzkJG9cUADKZzBpjKatfEILb69lZzlTT6jqy4VT4iLSTMidSbvTIXO6LSTsn1CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ccbaad6f562a0f091e344bbe49e0a81fb80ab8f8b1fda520d6d5206318e9e47c","last_reissued_at":"2026-05-18T01:15:31.761562Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:31.761562Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.01329","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":"2026-05-18T01:15:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2Yu6AIdCSRjeAHxhgmAyBG4kv7lmXDfI1ojchaWdDC9mqKLc2iEfCaOZitXzL9uTgl2qxjhS9O2Il4om9XxWDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T15:41:44.021591Z"},"content_sha256":"f1d6ff9bd1724616f38035c495a9ba90f3c1e01540de2af2ca4aaa95968e7811","schema_version":"1.0","event_id":"sha256:f1d6ff9bd1724616f38035c495a9ba90f3c1e01540de2af2ca4aaa95968e7811"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:ZS5K232WFIHQSHRUJO7ETYFID6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Single Channel Speech Enhancement Using Outlier Detection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"cs.SD","authors_text":"Bernard Widrow, Bowon Lee, Eunjoon Cho, Ronald Schafer","submitted_at":"2016-05-04T16:16:12Z","abstract_excerpt":"Distortion of the underlying speech is a common problem for single-channel speech enhancement algorithms, and hinders such methods from being used more extensively. A dictionary based speech enhancement method that emphasizes preserving the underlying speech is proposed. Spectral patches of clean speech are sampled and clustered to train a dictionary. Given a noisy speech spectral patch, the best matching dictionary entry is selected and used to estimate the noise power at each time-frequency bin. The noise estimation step is formulated as an outlier detection problem, where the noise at each "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.01329","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":"2026-05-18T01:15:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fUNDjOxKt4au61uLQTxaJgppNX1JF9RWLA0zwl/T/dp9ZliOg4fr7Tzj//Z4C/L29UV/Jf+DYJusHF4eMQZICw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T15:41:44.022063Z"},"content_sha256":"cb98b17f4e9ad809ef1d52c8f86a99db577e8d704c978a8e216c6bf348bd89e8","schema_version":"1.0","event_id":"sha256:cb98b17f4e9ad809ef1d52c8f86a99db577e8d704c978a8e216c6bf348bd89e8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZS5K232WFIHQSHRUJO7ETYFID6/bundle.json","state_url":"https://pith.science/pith/ZS5K232WFIHQSHRUJO7ETYFID6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZS5K232WFIHQSHRUJO7ETYFID6/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":"2026-08-05T15:41:44Z","links":{"resolver":"https://pith.science/pith/ZS5K232WFIHQSHRUJO7ETYFID6","bundle":"https://pith.science/pith/ZS5K232WFIHQSHRUJO7ETYFID6/bundle.json","state":"https://pith.science/pith/ZS5K232WFIHQSHRUJO7ETYFID6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZS5K232WFIHQSHRUJO7ETYFID6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZS5K232WFIHQSHRUJO7ETYFID6","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":"f6c90687ae88eb7a2f29104e1e2c466589988eca9ec70c69a381005a723951c8","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2016-05-04T16:16:12Z","title_canon_sha256":"3143e1ef626281242b258f93f5b0f1a0df0e2f2afd10f400df55b4a3e14582ee"},"schema_version":"1.0","source":{"id":"1605.01329","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.01329","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"arxiv_version","alias_value":"1605.01329v1","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.01329","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZS5K232WFIHQ","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZS5K232WFIHQSHRU","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZS5K232W","created_at":"2026-05-18T12:30:55Z"}],"graph_snapshots":[{"event_id":"sha256:cb98b17f4e9ad809ef1d52c8f86a99db577e8d704c978a8e216c6bf348bd89e8","target":"graph","created_at":"2026-05-18T01:15:31Z","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":"Distortion of the underlying speech is a common problem for single-channel speech enhancement algorithms, and hinders such methods from being used more extensively. A dictionary based speech enhancement method that emphasizes preserving the underlying speech is proposed. Spectral patches of clean speech are sampled and clustered to train a dictionary. Given a noisy speech spectral patch, the best matching dictionary entry is selected and used to estimate the noise power at each time-frequency bin. The noise estimation step is formulated as an outlier detection problem, where the noise at each ","authors_text":"Bernard Widrow, Bowon Lee, Eunjoon Cho, Ronald Schafer","cross_cats":["cs.LG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2016-05-04T16:16:12Z","title":"Single Channel Speech Enhancement Using Outlier Detection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.01329","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:f1d6ff9bd1724616f38035c495a9ba90f3c1e01540de2af2ca4aaa95968e7811","target":"record","created_at":"2026-05-18T01:15:31Z","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":"f6c90687ae88eb7a2f29104e1e2c466589988eca9ec70c69a381005a723951c8","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2016-05-04T16:16:12Z","title_canon_sha256":"3143e1ef626281242b258f93f5b0f1a0df0e2f2afd10f400df55b4a3e14582ee"},"schema_version":"1.0","source":{"id":"1605.01329","kind":"arxiv","version":1}},"canonical_sha256":"ccbaad6f562a0f091e344bbe49e0a81fb80ab8f8b1fda520d6d5206318e9e47c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ccbaad6f562a0f091e344bbe49e0a81fb80ab8f8b1fda520d6d5206318e9e47c","first_computed_at":"2026-05-18T01:15:31.761562Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:31.761562Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UzGhHoF2retrSfGqhrMtXN6nzkJG9cUADKZzBpjKatfEILb69lZzlTT6jqy4VT4iLSTMidSbvTIXO6LSTsn1CQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:31.762207Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.01329","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f1d6ff9bd1724616f38035c495a9ba90f3c1e01540de2af2ca4aaa95968e7811","sha256:cb98b17f4e9ad809ef1d52c8f86a99db577e8d704c978a8e216c6bf348bd89e8"],"state_sha256":"41b008d82224a433456658f81f39f784641cf50415e3dae0d11252ee047b0b2b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vqq5U7mdWuTZ6W1PFMG8DBPk3bfRHbGaL/fYO+Le5/iHmVbiVpYP+SRBgCTaWfvANewq4xnin5kFMaEWDc7eCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T15:41:44.026169Z","bundle_sha256":"3444144073cb1bd52f24b59a65dde09162b82161a1c898f0248af98173b09f5e"}}