{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:OR3EM3GMX5XFLMMIN7PP5DVOEW","short_pith_number":"pith:OR3EM3GM","canonical_record":{"source":{"id":"1402.4160","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-02-14T03:11:53Z","cross_cats_sorted":[],"title_canon_sha256":"5516dc981058cc5dceabba008a0efe62790c99ce5d603c38b8563eabd627e227","abstract_canon_sha256":"943732098d8291c263e7fb5f6b2f930ae50f85557a668c363a7458c257bd8222"},"schema_version":"1.0"},"canonical_sha256":"7476466cccbf6e55b1886fdefe8eae25a73583060937ae9967baf0734ffdd418","source":{"kind":"arxiv","id":"1402.4160","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.4160","created_at":"2026-05-18T02:58:44Z"},{"alias_kind":"arxiv_version","alias_value":"1402.4160v1","created_at":"2026-05-18T02:58:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.4160","created_at":"2026-05-18T02:58:44Z"},{"alias_kind":"pith_short_12","alias_value":"OR3EM3GMX5XF","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_16","alias_value":"OR3EM3GMX5XFLMMI","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_8","alias_value":"OR3EM3GM","created_at":"2026-05-18T12:28:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:OR3EM3GMX5XFLMMIN7PP5DVOEW","target":"record","payload":{"canonical_record":{"source":{"id":"1402.4160","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-02-14T03:11:53Z","cross_cats_sorted":[],"title_canon_sha256":"5516dc981058cc5dceabba008a0efe62790c99ce5d603c38b8563eabd627e227","abstract_canon_sha256":"943732098d8291c263e7fb5f6b2f930ae50f85557a668c363a7458c257bd8222"},"schema_version":"1.0"},"canonical_sha256":"7476466cccbf6e55b1886fdefe8eae25a73583060937ae9967baf0734ffdd418","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:58:44.681834Z","signature_b64":"2oLucUv4ifjDd1P/0+eMIpKY8UCZRUCaKkx+I/EKdy+55/arh7Hhp6NW96ERpFqfA22AUmkTj1VQS87UZI6TCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7476466cccbf6e55b1886fdefe8eae25a73583060937ae9967baf0734ffdd418","last_reissued_at":"2026-05-18T02:58:44.681213Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:58:44.681213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1402.4160","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":"2026-05-18T02:58:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FZ5evhEfMsMh2eCp3FJMvdFAolrT9sW1S6T0tVl0k0VL9iyr87j2QrneLeMpVOFT7HB4INihqKfAa5i5ZpGMDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T05:19:34.841073Z"},"content_sha256":"96845ce154451b34dc09d0f7c9c315c4cac056f597bba06bf43894852715c690","schema_version":"1.0","event_id":"sha256:96845ce154451b34dc09d0f7c9c315c4cac056f597bba06bf43894852715c690"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:OR3EM3GMX5XFLMMIN7PP5DVOEW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Maximizing the Signal-to-Alias Ratio in Non-Uniform Filter Banks for Acoustic Echo Cancellation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.SD","authors_text":"D. J. Shpak, R. C. Nongpiur","submitted_at":"2014-02-14T03:11:53Z","abstract_excerpt":"A new method for designing non-uniform filter-banks for acoustic echo cancellation is proposed. In the method, the analysis prototype filter design is framed as a convex optimization problem that maximizes the signal-to-alias ratio (SAR) in the analysis banks. Since each sub-band has a different bandwidth, the contribution to the overall SAR from each analysis bank is taken into account during optimization. To increase the degrees of freedom during optimization, no constraints are imposed on the phase or group delay of the filters; at the same time, low delay is achieved by ensuring that the r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.4160","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":"2026-05-18T02:58:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZIC8sFfI15qmWMGotpnI9SQRC4nQ33VDC/vbTjQ0tiiX3OpTxSb8tgmZHtPj65Rs1AdBGTNI1Oxy3Z0D0bXTCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T05:19:34.841448Z"},"content_sha256":"b7760e33df6c5d40caa455611a7bd3c9e7d84a50771430e21028e9d489595248","schema_version":"1.0","event_id":"sha256:b7760e33df6c5d40caa455611a7bd3c9e7d84a50771430e21028e9d489595248"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OR3EM3GMX5XFLMMIN7PP5DVOEW/bundle.json","state_url":"https://pith.science/pith/OR3EM3GMX5XFLMMIN7PP5DVOEW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OR3EM3GMX5XFLMMIN7PP5DVOEW/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":"2026-06-01T05:19:34Z","links":{"resolver":"https://pith.science/pith/OR3EM3GMX5XFLMMIN7PP5DVOEW","bundle":"https://pith.science/pith/OR3EM3GMX5XFLMMIN7PP5DVOEW/bundle.json","state":"https://pith.science/pith/OR3EM3GMX5XFLMMIN7PP5DVOEW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OR3EM3GMX5XFLMMIN7PP5DVOEW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:OR3EM3GMX5XFLMMIN7PP5DVOEW","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":"943732098d8291c263e7fb5f6b2f930ae50f85557a668c363a7458c257bd8222","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-02-14T03:11:53Z","title_canon_sha256":"5516dc981058cc5dceabba008a0efe62790c99ce5d603c38b8563eabd627e227"},"schema_version":"1.0","source":{"id":"1402.4160","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.4160","created_at":"2026-05-18T02:58:44Z"},{"alias_kind":"arxiv_version","alias_value":"1402.4160v1","created_at":"2026-05-18T02:58:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.4160","created_at":"2026-05-18T02:58:44Z"},{"alias_kind":"pith_short_12","alias_value":"OR3EM3GMX5XF","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_16","alias_value":"OR3EM3GMX5XFLMMI","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_8","alias_value":"OR3EM3GM","created_at":"2026-05-18T12:28:43Z"}],"graph_snapshots":[{"event_id":"sha256:b7760e33df6c5d40caa455611a7bd3c9e7d84a50771430e21028e9d489595248","target":"graph","created_at":"2026-05-18T02:58:44Z","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 new method for designing non-uniform filter-banks for acoustic echo cancellation is proposed. In the method, the analysis prototype filter design is framed as a convex optimization problem that maximizes the signal-to-alias ratio (SAR) in the analysis banks. Since each sub-band has a different bandwidth, the contribution to the overall SAR from each analysis bank is taken into account during optimization. To increase the degrees of freedom during optimization, no constraints are imposed on the phase or group delay of the filters; at the same time, low delay is achieved by ensuring that the r","authors_text":"D. J. Shpak, R. C. Nongpiur","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-02-14T03:11:53Z","title":"Maximizing the Signal-to-Alias Ratio in Non-Uniform Filter Banks for Acoustic Echo Cancellation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.4160","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":"sha256:96845ce154451b34dc09d0f7c9c315c4cac056f597bba06bf43894852715c690","target":"record","created_at":"2026-05-18T02:58:44Z","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":"943732098d8291c263e7fb5f6b2f930ae50f85557a668c363a7458c257bd8222","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2014-02-14T03:11:53Z","title_canon_sha256":"5516dc981058cc5dceabba008a0efe62790c99ce5d603c38b8563eabd627e227"},"schema_version":"1.0","source":{"id":"1402.4160","kind":"arxiv","version":1}},"canonical_sha256":"7476466cccbf6e55b1886fdefe8eae25a73583060937ae9967baf0734ffdd418","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7476466cccbf6e55b1886fdefe8eae25a73583060937ae9967baf0734ffdd418","first_computed_at":"2026-05-18T02:58:44.681213Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:58:44.681213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2oLucUv4ifjDd1P/0+eMIpKY8UCZRUCaKkx+I/EKdy+55/arh7Hhp6NW96ERpFqfA22AUmkTj1VQS87UZI6TCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:58:44.681834Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.4160","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:96845ce154451b34dc09d0f7c9c315c4cac056f597bba06bf43894852715c690","sha256:b7760e33df6c5d40caa455611a7bd3c9e7d84a50771430e21028e9d489595248"],"state_sha256":"1073c953a8ecfa454ea4a615f989d3232b0352ee095edb7b3a46760fe631791d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G9oIAD1JAF6jKtgeZXunXxxfJv3s5k+kexfcNNK5u7xEaDa4i0Ql9DW49KsISareZzrsY5bDHuF7yHsT4bjaCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T05:19:34.843536Z","bundle_sha256":"adbc5ff3e13c7f8322d9dbd22b8cf4fe422497c5e6e43d596d1b8914982830fe"}}