{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:GJ4ZPRABVKZSPJWGRATOOOGOAE","short_pith_number":"pith:GJ4ZPRAB","canonical_record":{"source":{"id":"1811.11663","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-11-28T16:43:56Z","cross_cats_sorted":["eess.AS"],"title_canon_sha256":"97a887586abf93a904d76eaffeb51afc2897cd0c7aeae3048335fe10babc7e50","abstract_canon_sha256":"c232f8249e300df47da64b3c2103b9734c3c46cde02794ee92fe7b10216b2427"},"schema_version":"1.0"},"canonical_sha256":"327997c401aab327a6c68826e738ce01378224a509915ceffc24ce3bcd7b83ad","source":{"kind":"arxiv","id":"1811.11663","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.11663","created_at":"2026-05-17T23:59:40Z"},{"alias_kind":"arxiv_version","alias_value":"1811.11663v1","created_at":"2026-05-17T23:59:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.11663","created_at":"2026-05-17T23:59:40Z"},{"alias_kind":"pith_short_12","alias_value":"GJ4ZPRABVKZS","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GJ4ZPRABVKZSPJWG","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GJ4ZPRAB","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:GJ4ZPRABVKZSPJWGRATOOOGOAE","target":"record","payload":{"canonical_record":{"source":{"id":"1811.11663","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-11-28T16:43:56Z","cross_cats_sorted":["eess.AS"],"title_canon_sha256":"97a887586abf93a904d76eaffeb51afc2897cd0c7aeae3048335fe10babc7e50","abstract_canon_sha256":"c232f8249e300df47da64b3c2103b9734c3c46cde02794ee92fe7b10216b2427"},"schema_version":"1.0"},"canonical_sha256":"327997c401aab327a6c68826e738ce01378224a509915ceffc24ce3bcd7b83ad","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:40.342620Z","signature_b64":"SWVn30wrPy0SEeG1QsCWrfmPXvuziFxyBGLLEsS46rJv2z3w062U6ZTs5FpLt+uHpMswtEYyOfPmoz1mkONnDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"327997c401aab327a6c68826e738ce01378224a509915ceffc24ce3bcd7b83ad","last_reissued_at":"2026-05-17T23:59:40.342009Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:40.342009Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.11663","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":"2026-05-17T23:59:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8zsZ0IStIUpxbIEvA2FGIXsIgUc9XncK217UazfVcO2dOAFD42dMFdSaEXxl9tgNZe1K/MkrRIJegNqqqQ1cCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T09:45:36.877773Z"},"content_sha256":"b9a6c6b5a6ca38ee375582809d15d7319000bb4e51311555d8c6632acebe39a3","schema_version":"1.0","event_id":"sha256:b9a6c6b5a6ca38ee375582809d15d7319000bb4e51311555d8c6632acebe39a3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:GJ4ZPRABVKZSPJWGRATOOOGOAE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multiple source direction of arrival estimation using subspace pseudointensity vectors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.AS"],"primary_cat":"cs.SD","authors_text":"Alastair H. Moore","submitted_at":"2018-11-28T16:43:56Z","abstract_excerpt":"The recently proposed subspace pseudointensity method for direction of arrival estimation is applied in the context of Tasks 1 and 2 of the LOCATA Challenge using the Eigenmike recordings. Specific implementation details are described and results reported for the development dataset, for which the ground truth source directions are available. For both single and multiple source scenarios, the average absolute error angle is about 9 degrees."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.11663","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":"2026-05-17T23:59:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"99bxMkz2Sz9W94wt1f7zo0iXPq4q91MFna1PNmQNTPfEK1XbL0YSp6gSSH0LY3BWhw7tbF2lEtJi5+Xofzb7DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T09:45:36.878118Z"},"content_sha256":"d86d6dc4195a7d51c4e6071bf034d898b04a590a2b886d11fb254ddfb975be06","schema_version":"1.0","event_id":"sha256:d86d6dc4195a7d51c4e6071bf034d898b04a590a2b886d11fb254ddfb975be06"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GJ4ZPRABVKZSPJWGRATOOOGOAE/bundle.json","state_url":"https://pith.science/pith/GJ4ZPRABVKZSPJWGRATOOOGOAE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GJ4ZPRABVKZSPJWGRATOOOGOAE/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":"2026-07-02T09:45:36Z","links":{"resolver":"https://pith.science/pith/GJ4ZPRABVKZSPJWGRATOOOGOAE","bundle":"https://pith.science/pith/GJ4ZPRABVKZSPJWGRATOOOGOAE/bundle.json","state":"https://pith.science/pith/GJ4ZPRABVKZSPJWGRATOOOGOAE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GJ4ZPRABVKZSPJWGRATOOOGOAE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:GJ4ZPRABVKZSPJWGRATOOOGOAE","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":"c232f8249e300df47da64b3c2103b9734c3c46cde02794ee92fe7b10216b2427","cross_cats_sorted":["eess.AS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-11-28T16:43:56Z","title_canon_sha256":"97a887586abf93a904d76eaffeb51afc2897cd0c7aeae3048335fe10babc7e50"},"schema_version":"1.0","source":{"id":"1811.11663","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.11663","created_at":"2026-05-17T23:59:40Z"},{"alias_kind":"arxiv_version","alias_value":"1811.11663v1","created_at":"2026-05-17T23:59:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.11663","created_at":"2026-05-17T23:59:40Z"},{"alias_kind":"pith_short_12","alias_value":"GJ4ZPRABVKZS","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GJ4ZPRABVKZSPJWG","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GJ4ZPRAB","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:d86d6dc4195a7d51c4e6071bf034d898b04a590a2b886d11fb254ddfb975be06","target":"graph","created_at":"2026-05-17T23:59:40Z","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":"The recently proposed subspace pseudointensity method for direction of arrival estimation is applied in the context of Tasks 1 and 2 of the LOCATA Challenge using the Eigenmike recordings. Specific implementation details are described and results reported for the development dataset, for which the ground truth source directions are available. For both single and multiple source scenarios, the average absolute error angle is about 9 degrees.","authors_text":"Alastair H. Moore","cross_cats":["eess.AS"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-11-28T16:43:56Z","title":"Multiple source direction of arrival estimation using subspace pseudointensity vectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.11663","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:b9a6c6b5a6ca38ee375582809d15d7319000bb4e51311555d8c6632acebe39a3","target":"record","created_at":"2026-05-17T23:59:40Z","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":"c232f8249e300df47da64b3c2103b9734c3c46cde02794ee92fe7b10216b2427","cross_cats_sorted":["eess.AS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2018-11-28T16:43:56Z","title_canon_sha256":"97a887586abf93a904d76eaffeb51afc2897cd0c7aeae3048335fe10babc7e50"},"schema_version":"1.0","source":{"id":"1811.11663","kind":"arxiv","version":1}},"canonical_sha256":"327997c401aab327a6c68826e738ce01378224a509915ceffc24ce3bcd7b83ad","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"327997c401aab327a6c68826e738ce01378224a509915ceffc24ce3bcd7b83ad","first_computed_at":"2026-05-17T23:59:40.342009Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:40.342009Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SWVn30wrPy0SEeG1QsCWrfmPXvuziFxyBGLLEsS46rJv2z3w062U6ZTs5FpLt+uHpMswtEYyOfPmoz1mkONnDA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:40.342620Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.11663","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b9a6c6b5a6ca38ee375582809d15d7319000bb4e51311555d8c6632acebe39a3","sha256:d86d6dc4195a7d51c4e6071bf034d898b04a590a2b886d11fb254ddfb975be06"],"state_sha256":"819daf6338fb14954716d38ff0752caa6c15bc39b85dd39c2e6a9db291b7a0d2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Tp4UTy29uLQ3gPPfpNmtctVFFjjxFQTppvEZNyD2pSytg8KaPGzLZrXSthrBEjLNN0yFdXWnQkzqagEGYZbkAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-02T09:45:36.880037Z","bundle_sha256":"8c2b30d22a55460bc1817d6e00f90a09010326e9dd917e4d1b2c7ea0e4786867"}}