{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:MDWKHQED5PR355ZTFM7CUINEFN","short_pith_number":"pith:MDWKHQED","canonical_record":{"source":{"id":"1802.05125","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2018-02-13T01:32:34Z","cross_cats_sorted":["cs.SD"],"title_canon_sha256":"084516d23e8da1c27e93f3e9e01d1f07bc5749e72a8d82cb66c93cff6663737d","abstract_canon_sha256":"55d45cef5a4ec44a9f5b1015344734edef74857756803e642e1cbf2dd52c3028"},"schema_version":"1.0"},"canonical_sha256":"60eca3c083ebe3bef7332b3e2a21a42b6c5406aeb2765373deeb52d8ea5b830a","source":{"kind":"arxiv","id":"1802.05125","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.05125","created_at":"2026-05-18T00:23:20Z"},{"alias_kind":"arxiv_version","alias_value":"1802.05125v1","created_at":"2026-05-18T00:23:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.05125","created_at":"2026-05-18T00:23:20Z"},{"alias_kind":"pith_short_12","alias_value":"MDWKHQED5PR3","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"MDWKHQED5PR355ZT","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"MDWKHQED","created_at":"2026-05-18T12:32:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:MDWKHQED5PR355ZTFM7CUINEFN","target":"record","payload":{"canonical_record":{"source":{"id":"1802.05125","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2018-02-13T01:32:34Z","cross_cats_sorted":["cs.SD"],"title_canon_sha256":"084516d23e8da1c27e93f3e9e01d1f07bc5749e72a8d82cb66c93cff6663737d","abstract_canon_sha256":"55d45cef5a4ec44a9f5b1015344734edef74857756803e642e1cbf2dd52c3028"},"schema_version":"1.0"},"canonical_sha256":"60eca3c083ebe3bef7332b3e2a21a42b6c5406aeb2765373deeb52d8ea5b830a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:23:20.370763Z","signature_b64":"xx5JM9340yRBst7esU/4DNR904zLXvHzZurb/ilwWk1+8Dkg6DVasiETS7Npk2VLq/Zjl3iDBOITkNqks8jzDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"60eca3c083ebe3bef7332b3e2a21a42b6c5406aeb2765373deeb52d8ea5b830a","last_reissued_at":"2026-05-18T00:23:20.370030Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:23:20.370030Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.05125","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":"2026-05-18T00:23:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ty+omoFJnZJs4Rc3rQSpdtkyA3s3KymO5vPXnDuUjvGSb8nRfZ76wNvrs7knT7G5SRO/1lKkwoetvx7U+n9+DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T12:01:58.988897Z"},"content_sha256":"0fd90ff812d096df7b8aae67138844289796cfbcad801bc0c8458e11739198e1","schema_version":"1.0","event_id":"sha256:0fd90ff812d096df7b8aae67138844289796cfbcad801bc0c8458e11739198e1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:MDWKHQED5PR355ZTFM7CUINEFN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Enhancement of Noisy Speech with Low Speech Distortion Based on Probabilistic Geometric Spectral Subtraction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SD"],"primary_cat":"eess.AS","authors_text":"Celia Shahnaz, Md Tauhidul Islam, M. Omair Ahmad, Wei-Ping Zhu","submitted_at":"2018-02-13T01:32:34Z","abstract_excerpt":"A speech enhancement method based on probabilistic geometric approach to spectral subtraction (PGA) performed on short time magnitude spectrum is presented in this paper. A confidence parameter of noise estimation is introduced in the gain function of the proposed method to prevent subtraction of the overestimated and underestimated noise, which not only removes the noise efficiently but also prevents the speech distortion. The noise compensated magnitude spectrum is then recombined with the unchanged phase spectrum to produce a modified complex spectrum prior to synthesize an enhanced frame. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.05125","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":"2026-05-18T00:23:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o4lXXJxK7D29C352bPLW1w8u5CeZMGP2pioNajhkbCwSBJEInca3qvM9pIiyXiig9pmcVCfCCu7uvCrZvQM/CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T12:01:58.989581Z"},"content_sha256":"f0e88ac718cc994b7a606f656cac85a9420ff6834665d448c77ebede2e864ab2","schema_version":"1.0","event_id":"sha256:f0e88ac718cc994b7a606f656cac85a9420ff6834665d448c77ebede2e864ab2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MDWKHQED5PR355ZTFM7CUINEFN/bundle.json","state_url":"https://pith.science/pith/MDWKHQED5PR355ZTFM7CUINEFN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MDWKHQED5PR355ZTFM7CUINEFN/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":"2026-05-22T12:01:58Z","links":{"resolver":"https://pith.science/pith/MDWKHQED5PR355ZTFM7CUINEFN","bundle":"https://pith.science/pith/MDWKHQED5PR355ZTFM7CUINEFN/bundle.json","state":"https://pith.science/pith/MDWKHQED5PR355ZTFM7CUINEFN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MDWKHQED5PR355ZTFM7CUINEFN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:MDWKHQED5PR355ZTFM7CUINEFN","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":"55d45cef5a4ec44a9f5b1015344734edef74857756803e642e1cbf2dd52c3028","cross_cats_sorted":["cs.SD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2018-02-13T01:32:34Z","title_canon_sha256":"084516d23e8da1c27e93f3e9e01d1f07bc5749e72a8d82cb66c93cff6663737d"},"schema_version":"1.0","source":{"id":"1802.05125","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.05125","created_at":"2026-05-18T00:23:20Z"},{"alias_kind":"arxiv_version","alias_value":"1802.05125v1","created_at":"2026-05-18T00:23:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.05125","created_at":"2026-05-18T00:23:20Z"},{"alias_kind":"pith_short_12","alias_value":"MDWKHQED5PR3","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"MDWKHQED5PR355ZT","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"MDWKHQED","created_at":"2026-05-18T12:32:37Z"}],"graph_snapshots":[{"event_id":"sha256:f0e88ac718cc994b7a606f656cac85a9420ff6834665d448c77ebede2e864ab2","target":"graph","created_at":"2026-05-18T00:23:20Z","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":"A speech enhancement method based on probabilistic geometric approach to spectral subtraction (PGA) performed on short time magnitude spectrum is presented in this paper. A confidence parameter of noise estimation is introduced in the gain function of the proposed method to prevent subtraction of the overestimated and underestimated noise, which not only removes the noise efficiently but also prevents the speech distortion. The noise compensated magnitude spectrum is then recombined with the unchanged phase spectrum to produce a modified complex spectrum prior to synthesize an enhanced frame. ","authors_text":"Celia Shahnaz, Md Tauhidul Islam, M. Omair Ahmad, Wei-Ping Zhu","cross_cats":["cs.SD"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2018-02-13T01:32:34Z","title":"Enhancement of Noisy Speech with Low Speech Distortion Based on Probabilistic Geometric Spectral Subtraction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.05125","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":"sha256:0fd90ff812d096df7b8aae67138844289796cfbcad801bc0c8458e11739198e1","target":"record","created_at":"2026-05-18T00:23:20Z","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":"55d45cef5a4ec44a9f5b1015344734edef74857756803e642e1cbf2dd52c3028","cross_cats_sorted":["cs.SD"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2018-02-13T01:32:34Z","title_canon_sha256":"084516d23e8da1c27e93f3e9e01d1f07bc5749e72a8d82cb66c93cff6663737d"},"schema_version":"1.0","source":{"id":"1802.05125","kind":"arxiv","version":1}},"canonical_sha256":"60eca3c083ebe3bef7332b3e2a21a42b6c5406aeb2765373deeb52d8ea5b830a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"60eca3c083ebe3bef7332b3e2a21a42b6c5406aeb2765373deeb52d8ea5b830a","first_computed_at":"2026-05-18T00:23:20.370030Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:23:20.370030Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xx5JM9340yRBst7esU/4DNR904zLXvHzZurb/ilwWk1+8Dkg6DVasiETS7Npk2VLq/Zjl3iDBOITkNqks8jzDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:23:20.370763Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.05125","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0fd90ff812d096df7b8aae67138844289796cfbcad801bc0c8458e11739198e1","sha256:f0e88ac718cc994b7a606f656cac85a9420ff6834665d448c77ebede2e864ab2"],"state_sha256":"72784768b75fb39a26b8c3ac5d0042d93ba4507030b108aad0a87e80527242ea"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eCsoAI9QHlGyiEZsfniCoBy0mWgMo4vUvsIMelL6S1ksfsi7HYVctPTV2DIcpJKYOM4mzSx6jGV1aMZHvpTjCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T12:01:58.992606Z","bundle_sha256":"5a74a419ea02c2f71d17150e6780d9d86c3468eded6f362182ec1eef391e6e7c"}}