{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:UPBGKUTFMVBYXO3GYO5QR2K7T5","short_pith_number":"pith:UPBGKUTF","canonical_record":{"source":{"id":"1407.2351","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-07-09T04:42:25Z","cross_cats_sorted":[],"title_canon_sha256":"36ff630f7df534da59f07bb7b2ad450e46d57e4961a4ab8fa1366b5498475cae","abstract_canon_sha256":"22e2b2d33c809025710c489537b740533895245f805023f7f2cbec699c764612"},"schema_version":"1.0"},"canonical_sha256":"a3c265526565438bbb66c3bb08e95f9f7eddefe46c425eb53c023e2d4195b669","source":{"kind":"arxiv","id":"1407.2351","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.2351","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"arxiv_version","alias_value":"1407.2351v3","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.2351","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"pith_short_12","alias_value":"UPBGKUTFMVBY","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"UPBGKUTFMVBYXO3G","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"UPBGKUTF","created_at":"2026-05-18T12:28:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:UPBGKUTFMVBYXO3GYO5QR2K7T5","target":"record","payload":{"canonical_record":{"source":{"id":"1407.2351","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-07-09T04:42:25Z","cross_cats_sorted":[],"title_canon_sha256":"36ff630f7df534da59f07bb7b2ad450e46d57e4961a4ab8fa1366b5498475cae","abstract_canon_sha256":"22e2b2d33c809025710c489537b740533895245f805023f7f2cbec699c764612"},"schema_version":"1.0"},"canonical_sha256":"a3c265526565438bbb66c3bb08e95f9f7eddefe46c425eb53c023e2d4195b669","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:27:05.366244Z","signature_b64":"sSg+iRspeCETzl842iiR/QGT0q8iZiNJNCakDOR1XMzuOiQxTEfpKMMRFaliAL28T1p2FcVEaT+XYY3AQHOeDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a3c265526565438bbb66c3bb08e95f9f7eddefe46c425eb53c023e2d4195b669","last_reissued_at":"2026-05-18T02:27:05.365842Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:27:05.365842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.2351","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:27:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e30yyKJ0+niVHN6fLk1FLv7tj8/3YqSvMBI9y4B1XtK+gOJPQrm/R8mDyjWnPHLEFJm+NRR8JxHsgm+7whpTBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T10:29:52.448087Z"},"content_sha256":"e17ff426dc01da0a2b10c35cee8fbe48a3d1b19a9e673315316c576dab8f8ec7","schema_version":"1.0","event_id":"sha256:e17ff426dc01da0a2b10c35cee8fbe48a3d1b19a9e673315316c576dab8f8ec7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:UPBGKUTFMVBYXO3GYO5QR2K7T5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Efficient Steered-Response Power Methods for Sound Source Localization Using Microphone Arrays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.SD","authors_text":"Bowon Lee, Leonardo O. Nunes, Luiz W. P. Biscainho, Markus V. S. Lima, Maur\\'icio V. M. Costa, Tadeu N. Ferreira, Wallace A. Martins","submitted_at":"2014-07-09T04:42:25Z","abstract_excerpt":"This paper proposes an efficient method based on the steered-response power (SRP) technique for sound source localization using microphone arrays: the volumetric SRP (V-SRP). As compared to the SRP, by deploying a sparser volumetric grid, the V-SRP achieves a significant reduction of the computational complexity without sacrificing the accuracy of the location estimates. By appending a fine search step to the V-SRP, its refined version (RV-SRP) improves on the compromise between complexity and accuracy. Experiments conducted in both simulated- and real-data scenarios demonstrate the benefits o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.2351","kind":"arxiv","version":3},"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":"2026-05-18T02:27:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZGbRehG6CPgKGSFq7pdYTpxsDME7QOD9qPCblLMzM/0SEY1yi3l/7Z7lNA7+O0kSLPdrgnGzCUYRN9DS//v4CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T10:29:52.448387Z"},"content_sha256":"aa2d88501d90291af4e9fcadbc16f5db9297f0d2fc2b6118fc918c30daa76b8e","schema_version":"1.0","event_id":"sha256:aa2d88501d90291af4e9fcadbc16f5db9297f0d2fc2b6118fc918c30daa76b8e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UPBGKUTFMVBYXO3GYO5QR2K7T5/bundle.json","state_url":"https://pith.science/pith/UPBGKUTFMVBYXO3GYO5QR2K7T5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UPBGKUTFMVBYXO3GYO5QR2K7T5/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":"2026-08-23T10:29:52Z","links":{"resolver":"https://pith.science/pith/UPBGKUTFMVBYXO3GYO5QR2K7T5","bundle":"https://pith.science/pith/UPBGKUTFMVBYXO3GYO5QR2K7T5/bundle.json","state":"https://pith.science/pith/UPBGKUTFMVBYXO3GYO5QR2K7T5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UPBGKUTFMVBYXO3GYO5QR2K7T5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:UPBGKUTFMVBYXO3GYO5QR2K7T5","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":"22e2b2d33c809025710c489537b740533895245f805023f7f2cbec699c764612","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-07-09T04:42:25Z","title_canon_sha256":"36ff630f7df534da59f07bb7b2ad450e46d57e4961a4ab8fa1366b5498475cae"},"schema_version":"1.0","source":{"id":"1407.2351","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.2351","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"arxiv_version","alias_value":"1407.2351v3","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.2351","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"pith_short_12","alias_value":"UPBGKUTFMVBY","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"UPBGKUTFMVBYXO3G","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"UPBGKUTF","created_at":"2026-05-18T12:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:aa2d88501d90291af4e9fcadbc16f5db9297f0d2fc2b6118fc918c30daa76b8e","target":"graph","created_at":"2026-05-18T02:27:05Z","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":"This paper proposes an efficient method based on the steered-response power (SRP) technique for sound source localization using microphone arrays: the volumetric SRP (V-SRP). As compared to the SRP, by deploying a sparser volumetric grid, the V-SRP achieves a significant reduction of the computational complexity without sacrificing the accuracy of the location estimates. By appending a fine search step to the V-SRP, its refined version (RV-SRP) improves on the compromise between complexity and accuracy. Experiments conducted in both simulated- and real-data scenarios demonstrate the benefits o","authors_text":"Bowon Lee, Leonardo O. Nunes, Luiz W. P. Biscainho, Markus V. S. Lima, Maur\\'icio V. M. Costa, Tadeu N. Ferreira, Wallace A. Martins","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-07-09T04:42:25Z","title":"Efficient Steered-Response Power Methods for Sound Source Localization Using Microphone Arrays"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.2351","kind":"arxiv","version":3},"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:e17ff426dc01da0a2b10c35cee8fbe48a3d1b19a9e673315316c576dab8f8ec7","target":"record","created_at":"2026-05-18T02:27:05Z","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":"22e2b2d33c809025710c489537b740533895245f805023f7f2cbec699c764612","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-07-09T04:42:25Z","title_canon_sha256":"36ff630f7df534da59f07bb7b2ad450e46d57e4961a4ab8fa1366b5498475cae"},"schema_version":"1.0","source":{"id":"1407.2351","kind":"arxiv","version":3}},"canonical_sha256":"a3c265526565438bbb66c3bb08e95f9f7eddefe46c425eb53c023e2d4195b669","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a3c265526565438bbb66c3bb08e95f9f7eddefe46c425eb53c023e2d4195b669","first_computed_at":"2026-05-18T02:27:05.365842Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:27:05.365842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sSg+iRspeCETzl842iiR/QGT0q8iZiNJNCakDOR1XMzuOiQxTEfpKMMRFaliAL28T1p2FcVEaT+XYY3AQHOeDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:27:05.366244Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.2351","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e17ff426dc01da0a2b10c35cee8fbe48a3d1b19a9e673315316c576dab8f8ec7","sha256:aa2d88501d90291af4e9fcadbc16f5db9297f0d2fc2b6118fc918c30daa76b8e"],"state_sha256":"524e90c2c94f79f8fa4d75a0e0ee77d7b2c163d1b9a0e0b65da1ab26fe8411bd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WJlbZQMSPXTFIe1m67JEjFRRBmEwahifxD++fbHbas9WkH3kIVpYjebkxqytrMWLVmLGWAun7253vjL0Gx3mBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T10:29:52.452209Z","bundle_sha256":"342724e48125c05e15fd129c3315c1c5b53430380d5303f222f3c95b86621fb7"}}