{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z","short_pith_number":"pith:MUFJZ5XU","canonical_record":{"source":{"id":"1711.01583","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2017-11-05T13:25:51Z","cross_cats_sorted":["stat.AP"],"title_canon_sha256":"2e8c8f0f6d0b58e8ca51cc4656b90af9d56ba9dbdcdaed6f4771b022df5633da","abstract_canon_sha256":"3b2e9b15e97aaa67a9509e443c8de0006bd7581614ed990d44148d32ea8ce991"},"schema_version":"1.0"},"canonical_sha256":"650a9cf6f46f730daeb76158475f70f672c54fe865292caba078ddd302890d00","source":{"kind":"arxiv","id":"1711.01583","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.01583","created_at":"2026-05-18T00:31:17Z"},{"alias_kind":"arxiv_version","alias_value":"1711.01583v1","created_at":"2026-05-18T00:31:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.01583","created_at":"2026-05-18T00:31:17Z"},{"alias_kind":"pith_short_12","alias_value":"MUFJZ5XUN5ZQ","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"MUFJZ5XUN5ZQ3LVX","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"MUFJZ5XU","created_at":"2026-05-18T12:31:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z","target":"record","payload":{"canonical_record":{"source":{"id":"1711.01583","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2017-11-05T13:25:51Z","cross_cats_sorted":["stat.AP"],"title_canon_sha256":"2e8c8f0f6d0b58e8ca51cc4656b90af9d56ba9dbdcdaed6f4771b022df5633da","abstract_canon_sha256":"3b2e9b15e97aaa67a9509e443c8de0006bd7581614ed990d44148d32ea8ce991"},"schema_version":"1.0"},"canonical_sha256":"650a9cf6f46f730daeb76158475f70f672c54fe865292caba078ddd302890d00","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:31:17.380421Z","signature_b64":"y3Xy8DmH3Cw05Q8a7USCdmu549Wm8Qk+yKHx92ncLkKOUmPaYesCRZjLcTzCW4oAZEyIW6oAcsOMvTQAkKFwCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"650a9cf6f46f730daeb76158475f70f672c54fe865292caba078ddd302890d00","last_reissued_at":"2026-05-18T00:31:17.379761Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:31:17.379761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1711.01583","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":"2026-05-18T00:31:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cC31yi9xW6s0ODUafqxAAfzuBRbH9AgEUJj34YxtDezIYvo9X67/GQldRlVLdZLlbSkgDmwBJK7vdGRgp0aeCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T17:51:33.593872Z"},"content_sha256":"5f54c54b7714663f8cd6e6d96c1987bf7d5d550616c87ff01e12142d713fa843","schema_version":"1.0","event_id":"sha256:5f54c54b7714663f8cd6e6d96c1987bf7d5d550616c87ff01e12142d713fa843"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Robust Expectation-Maximization Algorithm for DOA Estimation of Acoustic Sources in the Spherical Harmonic Domain","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["stat.AP"],"primary_cat":"eess.AS","authors_text":"Hossein Lolaee, Mohammad Ali Akhaee","submitted_at":"2017-11-05T13:25:51Z","abstract_excerpt":"The direction of arrival (DOA) estimation of sound sources has been a popular signal processing research topic due to its widespread applications. Using spherical microphone arrays (SMA), DOA estimation can be applied in the spherical harmonic (SH) domain without any spatial ambiguity. However, the environment reverberation and noise can degrade the estimation performance. In this paper, we propose a new expectation maximization (EM) algorithm for deterministic maximum likelihood (ML) DOA estimation of L sound sources in the presence of spatially nonuniform noise in the SH domain. Furthermore "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.01583","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":"2026-05-18T00:31:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7XGIhbdrBFYTvwGjlZIFfK0zquFmo2xviMl+8obQjf6tR9VxkZeiZpo2xCJKDnctIfcymWTz8y5Uhqfhy0EwDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T17:51:33.594217Z"},"content_sha256":"6e8af3660bbe857db2e95466398355cfcf39c7bb8a0b55ba0976c3e83303be20","schema_version":"1.0","event_id":"sha256:6e8af3660bbe857db2e95466398355cfcf39c7bb8a0b55ba0976c3e83303be20"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z/bundle.json","state_url":"https://pith.science/pith/MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z/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":"2026-06-25T17:51:33Z","links":{"resolver":"https://pith.science/pith/MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z","bundle":"https://pith.science/pith/MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z/bundle.json","state":"https://pith.science/pith/MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:MUFJZ5XUN5ZQ3LVXMFMEOX3Q6Z","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":"3b2e9b15e97aaa67a9509e443c8de0006bd7581614ed990d44148d32ea8ce991","cross_cats_sorted":["stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2017-11-05T13:25:51Z","title_canon_sha256":"2e8c8f0f6d0b58e8ca51cc4656b90af9d56ba9dbdcdaed6f4771b022df5633da"},"schema_version":"1.0","source":{"id":"1711.01583","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.01583","created_at":"2026-05-18T00:31:17Z"},{"alias_kind":"arxiv_version","alias_value":"1711.01583v1","created_at":"2026-05-18T00:31:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.01583","created_at":"2026-05-18T00:31:17Z"},{"alias_kind":"pith_short_12","alias_value":"MUFJZ5XUN5ZQ","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"MUFJZ5XUN5ZQ3LVX","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"MUFJZ5XU","created_at":"2026-05-18T12:31:31Z"}],"graph_snapshots":[{"event_id":"sha256:6e8af3660bbe857db2e95466398355cfcf39c7bb8a0b55ba0976c3e83303be20","target":"graph","created_at":"2026-05-18T00:31:17Z","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 direction of arrival (DOA) estimation of sound sources has been a popular signal processing research topic due to its widespread applications. Using spherical microphone arrays (SMA), DOA estimation can be applied in the spherical harmonic (SH) domain without any spatial ambiguity. However, the environment reverberation and noise can degrade the estimation performance. In this paper, we propose a new expectation maximization (EM) algorithm for deterministic maximum likelihood (ML) DOA estimation of L sound sources in the presence of spatially nonuniform noise in the SH domain. Furthermore ","authors_text":"Hossein Lolaee, Mohammad Ali Akhaee","cross_cats":["stat.AP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2017-11-05T13:25:51Z","title":"Robust Expectation-Maximization Algorithm for DOA Estimation of Acoustic Sources in the Spherical Harmonic Domain"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.01583","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":"sha256:5f54c54b7714663f8cd6e6d96c1987bf7d5d550616c87ff01e12142d713fa843","target":"record","created_at":"2026-05-18T00:31:17Z","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":"3b2e9b15e97aaa67a9509e443c8de0006bd7581614ed990d44148d32ea8ce991","cross_cats_sorted":["stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2017-11-05T13:25:51Z","title_canon_sha256":"2e8c8f0f6d0b58e8ca51cc4656b90af9d56ba9dbdcdaed6f4771b022df5633da"},"schema_version":"1.0","source":{"id":"1711.01583","kind":"arxiv","version":1}},"canonical_sha256":"650a9cf6f46f730daeb76158475f70f672c54fe865292caba078ddd302890d00","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"650a9cf6f46f730daeb76158475f70f672c54fe865292caba078ddd302890d00","first_computed_at":"2026-05-18T00:31:17.379761Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:31:17.379761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"y3Xy8DmH3Cw05Q8a7USCdmu549Wm8Qk+yKHx92ncLkKOUmPaYesCRZjLcTzCW4oAZEyIW6oAcsOMvTQAkKFwCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:31:17.380421Z","signed_message":"canonical_sha256_bytes"},"source_id":"1711.01583","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5f54c54b7714663f8cd6e6d96c1987bf7d5d550616c87ff01e12142d713fa843","sha256:6e8af3660bbe857db2e95466398355cfcf39c7bb8a0b55ba0976c3e83303be20"],"state_sha256":"f3adf8b710b190e6c6f6cefb8e0a1db15e7bb420cefabed928545e127b736418"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cSX5BGDRWSOe7cDjvXHp1Y3r5iE4/QToGZ/ZUHy3XjwSNUr27EME28R6FYed6gSVKIZg8wIcDKhswSPXWnjbCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-25T17:51:33.596142Z","bundle_sha256":"46fc15407ff3f7ee3a6ff47142322ecf14fce2054e5f56fe935774be0ba96707"}}