{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:OQKIOO3IXSFCHOYWAYXRPBQGCG","short_pith_number":"pith:OQKIOO3I","canonical_record":{"source":{"id":"2309.09493","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.AS","submitted_at":"2023-09-18T05:30:15Z","cross_cats_sorted":["cs.AI","cs.SD"],"title_canon_sha256":"8ed8cbd988adbd53c25466377e41ebbdcca47a656178b349c625a8660a38ce06","abstract_canon_sha256":"df04af756ce80968d493968449d4215ccee3611ecbe66c89595139dcdce3a65b"},"schema_version":"1.0"},"canonical_sha256":"7414873b68bc8a23bb16062f17860611ae57b6e94b769a6df073e4940b322ce3","source":{"kind":"arxiv","id":"2309.09493","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.09493","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"arxiv_version","alias_value":"2309.09493v1","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.09493","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"pith_short_12","alias_value":"OQKIOO3IXSFC","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"pith_short_16","alias_value":"OQKIOO3IXSFCHOYW","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"pith_short_8","alias_value":"OQKIOO3I","created_at":"2026-07-05T06:51:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:OQKIOO3IXSFCHOYWAYXRPBQGCG","target":"record","payload":{"canonical_record":{"source":{"id":"2309.09493","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.AS","submitted_at":"2023-09-18T05:30:15Z","cross_cats_sorted":["cs.AI","cs.SD"],"title_canon_sha256":"8ed8cbd988adbd53c25466377e41ebbdcca47a656178b349c625a8660a38ce06","abstract_canon_sha256":"df04af756ce80968d493968449d4215ccee3611ecbe66c89595139dcdce3a65b"},"schema_version":"1.0"},"canonical_sha256":"7414873b68bc8a23bb16062f17860611ae57b6e94b769a6df073e4940b322ce3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:51:39.961220Z","signature_b64":"f2Ofk/TgkGhXIwepNJZAfxUgYWKCI0sMXeePt58j4PAXte7gtkFaYSGfbtgfDj313cvxyok0LD6bCZaUWgv7Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7414873b68bc8a23bb16062f17860611ae57b6e94b769a6df073e4940b322ce3","last_reissued_at":"2026-07-05T06:51:39.960692Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:51:39.960692Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2309.09493","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":"2026-07-05T06:51:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tojyrFCniBQbM4JJsqP718c29XsrjvIXCUKunWGt2CyAFLS9DgpSUnVRV5uIP9HU6cWZ77Dm52e9fgX7gKloDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T17:19:09.620558Z"},"content_sha256":"d63c743c12d5469d0b6599dd1692bed7055485242b818386b3f8a92f6092973a","schema_version":"1.0","event_id":"sha256:d63c743c12d5469d0b6599dd1692bed7055485242b818386b3f8a92f6092973a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:OQKIOO3IXSFCHOYWAYXRPBQGCG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HiFTNet: A Fast High-Quality Neural Vocoder with Harmonic-plus-Noise Filter and Inverse Short Time Fourier Transform","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["cs.AI","cs.SD"],"primary_cat":"eess.AS","authors_text":"Cong Han, Nima Mesgarani, Xilin Jiang, Yinghao Aaron Li","submitted_at":"2023-09-18T05:30:15Z","abstract_excerpt":"Recent advancements in speech synthesis have leveraged GAN-based networks like HiFi-GAN and BigVGAN to produce high-fidelity waveforms from mel-spectrograms. However, these networks are computationally expensive and parameter-heavy. iSTFTNet addresses these limitations by integrating inverse short-time Fourier transform (iSTFT) into the network, achieving both speed and parameter efficiency. In this paper, we introduce an extension to iSTFTNet, termed HiFTNet, which incorporates a harmonic-plus-noise source filter in the time-frequency domain that uses a sinusoidal source from the fundamental "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.09493","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2309.09493/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T06:51:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NfRCRiSthTXCgJYngKVUV86/mJSdvC27X7skO7VRTULmUnEylJ5Zt2MS5yxCP5iJ24fMJka3UsFxiKseHDqODg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T17:19:09.620928Z"},"content_sha256":"72d3cc2882f91519f8cc4e427659ce322e677fdc20d4f3504b5c14440e1b289c","schema_version":"1.0","event_id":"sha256:72d3cc2882f91519f8cc4e427659ce322e677fdc20d4f3504b5c14440e1b289c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OQKIOO3IXSFCHOYWAYXRPBQGCG/bundle.json","state_url":"https://pith.science/pith/OQKIOO3IXSFCHOYWAYXRPBQGCG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OQKIOO3IXSFCHOYWAYXRPBQGCG/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":"2026-07-08T17:19:09Z","links":{"resolver":"https://pith.science/pith/OQKIOO3IXSFCHOYWAYXRPBQGCG","bundle":"https://pith.science/pith/OQKIOO3IXSFCHOYWAYXRPBQGCG/bundle.json","state":"https://pith.science/pith/OQKIOO3IXSFCHOYWAYXRPBQGCG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OQKIOO3IXSFCHOYWAYXRPBQGCG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:OQKIOO3IXSFCHOYWAYXRPBQGCG","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":"df04af756ce80968d493968449d4215ccee3611ecbe66c89595139dcdce3a65b","cross_cats_sorted":["cs.AI","cs.SD"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.AS","submitted_at":"2023-09-18T05:30:15Z","title_canon_sha256":"8ed8cbd988adbd53c25466377e41ebbdcca47a656178b349c625a8660a38ce06"},"schema_version":"1.0","source":{"id":"2309.09493","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.09493","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"arxiv_version","alias_value":"2309.09493v1","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.09493","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"pith_short_12","alias_value":"OQKIOO3IXSFC","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"pith_short_16","alias_value":"OQKIOO3IXSFCHOYW","created_at":"2026-07-05T06:51:39Z"},{"alias_kind":"pith_short_8","alias_value":"OQKIOO3I","created_at":"2026-07-05T06:51:39Z"}],"graph_snapshots":[{"event_id":"sha256:72d3cc2882f91519f8cc4e427659ce322e677fdc20d4f3504b5c14440e1b289c","target":"graph","created_at":"2026-07-05T06:51:39Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2309.09493/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recent advancements in speech synthesis have leveraged GAN-based networks like HiFi-GAN and BigVGAN to produce high-fidelity waveforms from mel-spectrograms. However, these networks are computationally expensive and parameter-heavy. iSTFTNet addresses these limitations by integrating inverse short-time Fourier transform (iSTFT) into the network, achieving both speed and parameter efficiency. In this paper, we introduce an extension to iSTFTNet, termed HiFTNet, which incorporates a harmonic-plus-noise source filter in the time-frequency domain that uses a sinusoidal source from the fundamental ","authors_text":"Cong Han, Nima Mesgarani, Xilin Jiang, Yinghao Aaron Li","cross_cats":["cs.AI","cs.SD"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.AS","submitted_at":"2023-09-18T05:30:15Z","title":"HiFTNet: A Fast High-Quality Neural Vocoder with Harmonic-plus-Noise Filter and Inverse Short Time Fourier Transform"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.09493","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:d63c743c12d5469d0b6599dd1692bed7055485242b818386b3f8a92f6092973a","target":"record","created_at":"2026-07-05T06:51:39Z","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":"df04af756ce80968d493968449d4215ccee3611ecbe66c89595139dcdce3a65b","cross_cats_sorted":["cs.AI","cs.SD"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.AS","submitted_at":"2023-09-18T05:30:15Z","title_canon_sha256":"8ed8cbd988adbd53c25466377e41ebbdcca47a656178b349c625a8660a38ce06"},"schema_version":"1.0","source":{"id":"2309.09493","kind":"arxiv","version":1}},"canonical_sha256":"7414873b68bc8a23bb16062f17860611ae57b6e94b769a6df073e4940b322ce3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7414873b68bc8a23bb16062f17860611ae57b6e94b769a6df073e4940b322ce3","first_computed_at":"2026-07-05T06:51:39.960692Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:51:39.960692Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"f2Ofk/TgkGhXIwepNJZAfxUgYWKCI0sMXeePt58j4PAXte7gtkFaYSGfbtgfDj313cvxyok0LD6bCZaUWgv7Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T06:51:39.961220Z","signed_message":"canonical_sha256_bytes"},"source_id":"2309.09493","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d63c743c12d5469d0b6599dd1692bed7055485242b818386b3f8a92f6092973a","sha256:72d3cc2882f91519f8cc4e427659ce322e677fdc20d4f3504b5c14440e1b289c"],"state_sha256":"9473fff877b0932e20adc04de4377850be100185e96b5272637c1697d0e90671"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BKOvBBeFiTG5cj8GH9vfc0LH56wBkGm10TSAUGcMUUJcMmaiz1U0T72eSZGF52o/ddu6xzZvI1zLrGlkr8ToAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T17:19:09.623033Z","bundle_sha256":"267195ea29c8571b98ca02c93587795dc204bf26ce71182599af353c8e811ec5"}}