{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:764EMCXL54BTAZNLCBMPROGY46","short_pith_number":"pith:764EMCXL","canonical_record":{"source":{"id":"1412.6357","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2014-12-19T14:30:23Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"8b816dd861f59c1634d9efaf32c57251f3fb29a57746083a8931af5c775c2689","abstract_canon_sha256":"ff4693067ea9f97a64d17df83ac3e4d1c75eeb5dff3449155b7edce244cdf776"},"schema_version":"1.0"},"canonical_sha256":"ffb8460aebef033065ab1058f8b8d8e7ac7308a9b1a0fcd5e0956ff7014efd53","source":{"kind":"arxiv","id":"1412.6357","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1412.6357","created_at":"2026-05-18T02:30:53Z"},{"alias_kind":"arxiv_version","alias_value":"1412.6357v1","created_at":"2026-05-18T02:30:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1412.6357","created_at":"2026-05-18T02:30:53Z"},{"alias_kind":"pith_short_12","alias_value":"764EMCXL54BT","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"764EMCXL54BTAZNL","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"764EMCXL","created_at":"2026-05-18T12:28:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:764EMCXL54BTAZNLCBMPROGY46","target":"record","payload":{"canonical_record":{"source":{"id":"1412.6357","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2014-12-19T14:30:23Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"8b816dd861f59c1634d9efaf32c57251f3fb29a57746083a8931af5c775c2689","abstract_canon_sha256":"ff4693067ea9f97a64d17df83ac3e4d1c75eeb5dff3449155b7edce244cdf776"},"schema_version":"1.0"},"canonical_sha256":"ffb8460aebef033065ab1058f8b8d8e7ac7308a9b1a0fcd5e0956ff7014efd53","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:30:53.724768Z","signature_b64":"LsrnCFVW5fz+QsNwmdHUDvU29pc+My2FC5Z9k/R+K/VpDwczSFoilQNQCPIIRaIgghHvoMUL2iVu/VGIWPa2AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ffb8460aebef033065ab1058f8b8d8e7ac7308a9b1a0fcd5e0956ff7014efd53","last_reissued_at":"2026-05-18T02:30:53.724171Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:30:53.724171Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1412.6357","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":"2026-05-18T02:30:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BlJlEvSM8BBOVPSpI8miW7LY0CZ84/VoyxQrfKRltX1sZKe7qR0E9haQpkEH9z49Z2h7EbJMUJimtNVkVLhbDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T03:33:16.460685Z"},"content_sha256":"85ae44c4e53be262e463ee835d0af767f8d3d282b3ebe1d0d44a2b6e67304953","schema_version":"1.0","event_id":"sha256:85ae44c4e53be262e463ee835d0af767f8d3d282b3ebe1d0d44a2b6e67304953"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:764EMCXL54BTAZNLCBMPROGY46","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Achievement of Preassigned Spectra in the Synthesis of Band-Pass Constant-Envelope Signals by Rapidly Hopping through Discrete Frequencies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.IT","math.IT"],"primary_cat":"physics.data-an","authors_text":"Sergio Callegari","submitted_at":"2014-12-19T14:30:23Z","abstract_excerpt":"Spread-spectrum signals are increasingly adopted in fields including communications, testing of electronic systems, Electro-Magnetic Compatibility (EMC) enhancement, ultrasonic non-destructive testing. This paper considers the synthesis of constant-envelope band-pass wave-forms with preassigned spectra via an FM technique using only a limited number of frequencies. In particular, an optimization-based approach for the selection of appropriate modulation parameters and statistical features of the modulating waveform is proposed. By example, it is shown that the design problem generally admits m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.6357","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":"2026-05-18T02:30:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gPVHLxR1xUqfZTi0V4kAghfqMAzpTNWcf/ZIhhiAYRS4oFHRZVZsk+Fk6tIKbyT9BwiEGK+/qBS6TFaeBFAYBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T03:33:16.461029Z"},"content_sha256":"db647c32a02393da3b43e2c778850e4bd8b4f6885381c3b37f104199fbf1ad11","schema_version":"1.0","event_id":"sha256:db647c32a02393da3b43e2c778850e4bd8b4f6885381c3b37f104199fbf1ad11"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/764EMCXL54BTAZNLCBMPROGY46/bundle.json","state_url":"https://pith.science/pith/764EMCXL54BTAZNLCBMPROGY46/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/764EMCXL54BTAZNLCBMPROGY46/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":"2026-06-24T03:33:16Z","links":{"resolver":"https://pith.science/pith/764EMCXL54BTAZNLCBMPROGY46","bundle":"https://pith.science/pith/764EMCXL54BTAZNLCBMPROGY46/bundle.json","state":"https://pith.science/pith/764EMCXL54BTAZNLCBMPROGY46/state.json","well_known_bundle":"https://pith.science/.well-known/pith/764EMCXL54BTAZNLCBMPROGY46/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:764EMCXL54BTAZNLCBMPROGY46","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":"ff4693067ea9f97a64d17df83ac3e4d1c75eeb5dff3449155b7edce244cdf776","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2014-12-19T14:30:23Z","title_canon_sha256":"8b816dd861f59c1634d9efaf32c57251f3fb29a57746083a8931af5c775c2689"},"schema_version":"1.0","source":{"id":"1412.6357","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1412.6357","created_at":"2026-05-18T02:30:53Z"},{"alias_kind":"arxiv_version","alias_value":"1412.6357v1","created_at":"2026-05-18T02:30:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1412.6357","created_at":"2026-05-18T02:30:53Z"},{"alias_kind":"pith_short_12","alias_value":"764EMCXL54BT","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"764EMCXL54BTAZNL","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"764EMCXL","created_at":"2026-05-18T12:28:16Z"}],"graph_snapshots":[{"event_id":"sha256:db647c32a02393da3b43e2c778850e4bd8b4f6885381c3b37f104199fbf1ad11","target":"graph","created_at":"2026-05-18T02:30:53Z","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":"Spread-spectrum signals are increasingly adopted in fields including communications, testing of electronic systems, Electro-Magnetic Compatibility (EMC) enhancement, ultrasonic non-destructive testing. This paper considers the synthesis of constant-envelope band-pass wave-forms with preassigned spectra via an FM technique using only a limited number of frequencies. In particular, an optimization-based approach for the selection of appropriate modulation parameters and statistical features of the modulating waveform is proposed. By example, it is shown that the design problem generally admits m","authors_text":"Sergio Callegari","cross_cats":["cs.IT","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2014-12-19T14:30:23Z","title":"Achievement of Preassigned Spectra in the Synthesis of Band-Pass Constant-Envelope Signals by Rapidly Hopping through Discrete Frequencies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.6357","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":"sha256:85ae44c4e53be262e463ee835d0af767f8d3d282b3ebe1d0d44a2b6e67304953","target":"record","created_at":"2026-05-18T02:30:53Z","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":"ff4693067ea9f97a64d17df83ac3e4d1c75eeb5dff3449155b7edce244cdf776","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2014-12-19T14:30:23Z","title_canon_sha256":"8b816dd861f59c1634d9efaf32c57251f3fb29a57746083a8931af5c775c2689"},"schema_version":"1.0","source":{"id":"1412.6357","kind":"arxiv","version":1}},"canonical_sha256":"ffb8460aebef033065ab1058f8b8d8e7ac7308a9b1a0fcd5e0956ff7014efd53","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ffb8460aebef033065ab1058f8b8d8e7ac7308a9b1a0fcd5e0956ff7014efd53","first_computed_at":"2026-05-18T02:30:53.724171Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:30:53.724171Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LsrnCFVW5fz+QsNwmdHUDvU29pc+My2FC5Z9k/R+K/VpDwczSFoilQNQCPIIRaIgghHvoMUL2iVu/VGIWPa2AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:30:53.724768Z","signed_message":"canonical_sha256_bytes"},"source_id":"1412.6357","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:85ae44c4e53be262e463ee835d0af767f8d3d282b3ebe1d0d44a2b6e67304953","sha256:db647c32a02393da3b43e2c778850e4bd8b4f6885381c3b37f104199fbf1ad11"],"state_sha256":"5129b8e18b598cbf4a8c6ced82bf8dc1fc23ef2391dd9a7bc837475f114a4afc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rdA7FlOGNxvk4XnguZgmRpAk239QueFGumAPyODQsPoUOed+hClpOUMZhLDWFkBpETkdmxp342XYoQKxvPA8Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T03:33:16.462888Z","bundle_sha256":"4df13d6d5d2afd8e4a6f8830ec3919e87b745d835785c5a762b8d71d41e09da9"}}