{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp05_complete_proposal_portfolio20_20260803","cell_id":"negative_space_design__marine_science","arm":"COMPLETE_PROPOSAL_PORTFOLIO","candidate_id":"nsd-ms-quiet-acoustic-apertures","proposal_index":1,"version":0,"title":"Protected Quiet Apertures in Active-Acoustic Ocean Surveys","problem":"On a research vessel collecting active-acoustic and passive-hydrophone data concurrently, closely spaced research transmissions and their reverberation repeatedly occupy the acoustic record. Naturally occurring biological calls, geophysical sounds, and the ambient noise floor may therefore be present but lack uncontaminated intervals in which they can be interpreted. The problem is not missing instrumentation; it is that the vessel's scientific program fills nearly every potentially informative quiet interval.","actors":["Cruise chief scientist","Vessel master and bridge watch","Active-acoustics lead","Passive-acoustics lead","Acoustic-system operator","Post-cruise data analysts"],"observable_state":"The transmission log shows few intervals longer than the measured transmitter-and-environment ringdown time; passive records during otherwise eligible transect segments contain scheduled pings or reverberation; analysts cannot label apparent silence as ambient conditions, transmitter inactivity, equipment failure, or missing data from metadata alone.","consequence":"Analysts cannot cleanly estimate the contemporaneous ambient acoustic baseline or determine whether weak natural events were absent, masked by self-generated sound, or lost because of an acquisition fault, weakening interpretation of the passive record and its relationship to the active survey.","affected_objective":"Obtain interpretable passive-acoustic observations and ambient-noise references while retaining the active-acoustic measurements required by the approved survey plan.","intervention":"Before a bounded survey block, map which research transmissions compete with passive observation and designate a recoverable subset as omission candidates. At predetermined, scientifically eligible segment boundaries, the acoustic-system operator activates a controller-enforced quiet aperture: noncritical research transmitters remain off, the passive hydrophone continues recording, and navigation, communications, required mitigation monitoring, and other safety-critical systems remain available. The aperture begins only after recorded transmission and expected ringdown have ceased. A continuous metadata heartbeat labels the state as planned quiet, records which sources are muted, and distinguishes it from equipment failure or missing data. The aperture ends at its scheduled duration, when the passive-acoustics lead records the required reference observation, or immediately upon a vessel-master safety override. Omitted transmissions remain in the survey plan as logged, recoverable work rather than being silently deleted.","structural_mapping":[{"archetype_element":"Attention Competition Map","domain_realization":"A timing-and-frequency map identifies active research transmissions, vessel noise, ringdown, passive targets, and protected safety signals that occupy the same observation field."},{"archetype_element":"Omission Candidate","domain_realization":"Only noncritical research pings within preapproved segment boundaries are candidates for temporary omission; navigation and safety functions are excluded."},{"archetype_element":"Protected Empty Space","domain_realization":"A bounded interval without noncritical active transmissions becomes an acoustic observation aperture that later schedule additions cannot fill without explicit protocol revision."},{"archetype_element":"Positive Form Relationship","domain_realization":"The quiet interval exists specifically to frame ambient sound, weak natural events, and the decay boundary around adjacent active transmissions."},{"archetype_element":"Absence Boundary","domain_realization":"Controller state, start and stop timestamps, ringdown clearance, and a vessel-master override define and enforce the interval."},{"archetype_element":"Meaning-of-Absence Check","domain_realization":"Metadata distinguishes planned transmitter silence from equipment fault, data dropout, permission restriction, and an emergency shutdown."},{"archetype_element":"Reintroduction Trigger","domain_realization":"Research transmissions resume at the scheduled endpoint, after the required passive reference is recorded, or under the approved abort rule."},{"archetype_element":"Accessibility and Recoverability Guardrail","domain_realization":"Operators retain visible transmitter status and an immediate restore path; omitted active samples are logged for possible rescheduling, while safety-critical controls remain exposed."},{"archetype_element":"Clarity or Effect Test","domain_realization":"Blind comparison tests whether analysts can classify ambient baseline and weak candidate events more consistently in protected apertures than in ordinary active-survey intervals."}],"mechanism_mapping":[{"mechanism_slug":"blank_or_rest_frame","role":"Places an unmistakably intentional quiet interval at a genuine survey-segment boundary and defines the return of active transmission as part of the interval's design.","counterfactual_removal":"Without this mechanism, transmitter inactivity would be opportunistic or ambiguously placed, so it could be mistaken for a fault and might not provide a usable observation interval."},{"mechanism_slug":"focus_mode_or_control_hiding","role":"Temporarily suppresses only the noncritical transmitters competing with passive observation while preserving visible status, fast restoration, and safety-critical systems.","counterfactual_removal":"Without selective hiding and guaranteed restoration, the protocol would either leave masking sources active or indiscriminately disable controls needed for safe operation."},{"mechanism_slug":"empty_state_design","role":"Gives the no-transmission state an explicit diagnosis and metadata label, separating planned quiet from failure, missing data, and emergency shutdown.","counterfactual_removal":"Without state diagnosis, analysts could not safely interpret an empty transmission log as designed absence rather than acquisition failure."},{"mechanism_slug":"editorial_cut","role":"Treats each omitted ping as a documented, reversible cut tested against the active survey's load-bearing coverage requirements.","counterfactual_removal":"Without recoverable cutting, quiet apertures could silently erase necessary active observations or become permanent losses that cannot be audited or rescheduled."}],"causal_chain":["Closely spaced research transmissions and reverberation compete with passive signals for the same acoustic record.","Eligible noncritical transmissions are identified rather than deleting acoustic activity indiscriminately.","A controller-enforced boundary prevents those transmissions from filling selected quiet apertures.","Passive recording and an explicit metadata heartbeat continue throughout each aperture.","The resulting interval can be interpreted as planned acoustic absence rather than data failure.","Analysts receive contemporaneous records in which ambient conditions and weak natural events can be assessed without the omitted self-generated signals.","Logged resumption and recovery rules reconnect the quiet interval to the active survey without concealing the measurements that were deferred."],"baseline":"Run the approved active-acoustic schedule continuously except for incidental operational gaps, then attempt to remove transmissions and reverberation during post-processing; incidental gaps are not protected, sized, or consistently labeled as passive-observation states.","nearest_rivals":["Post-process the continuous record using filtering, blanking, or source subtraction; this preserves active coverage but cannot observe passive signal content that was physically masked or saturated during transmission.","Deploy a separate passive platform outside the vessel's acoustic influence; this separates sources spatially but introduces another platform, synchronization requirements, and a different local observation context.","Reduce transmitter power or stagger frequencies while continuing to transmit; this may reduce competition but does not create a fully characterized no-transmission reference interval.","Use unscheduled operational pauses as passive samples; this requires no protocol change but leaves interval duration, placement, and meaning uncontrolled."],"remaining_contrastive_claim":"The proposal's distinctive testable contribution is not general noise reduction or fewer survey measurements; it is whether controller-protected, explicitly labeled absence at selected segment boundaries creates interpretable passive-observation apertures that post-processing of an acoustically occupied interval cannot supply.","authority_safety":{"decision_authority":"The cruise chief scientist may approve eligible quiet apertures within the scientific plan; the active-acoustics lead may execute them; the vessel master retains final authority over navigation, safety, legal compliance, and immediate override.","authorized_first_step":"Conduct one preapproved trial during a noncritical survey or transit block, using a short sequence of ordinary operating intervals and scheduled quiet apertures while preserving all required navigation, communications, mitigation, and safety functions.","excluded_actions":["Disabling collision-avoidance, navigation, distress, or required communications systems","Muting monitoring required by a permit, mitigation plan, or vessel procedure","Creating quiet apertures in safety-critical maneuvering or emergency conditions","Permanently deleting omitted active-acoustic work or its audit record","Extending the trial to the full cruise before the bounded comparison is reviewed","Interpreting planned quiet as evidence that biological or geophysical signals are absent"],"halt_rollback":"The vessel master or acoustic-system operator immediately terminates an aperture if safety, equipment state, or protocol compliance becomes uncertain. The system restores the approved transmitter configuration, retains all state-transition logs, flags the affected aperture as aborted, and returns to the baseline schedule."},"negative_tests":{"strongest_counterevidence":"During eligible trial segments, planned apertures do not produce a distinguishable reduction in self-generated contamination or any improvement in analysts' ability to classify ambient baseline and weak candidate events, while continuous vessel machinery or environmental noise remains the limiting source.","problem_falsifier":"The problem is falsified for the tested system if existing labeled no-transmission intervals already exceed the relevant ringdown duration and provide adequate passive references, yet interpretation remains limited by hydrophone sensitivity, placement, synchronization, or unrelated vessel noise.","intervention_falsifier":"The intervention is falsified if protected apertures are no more interpretable than matched baseline intervals after blinded review, or if their placement creates unacceptable active-survey gaps that cannot be recovered within the approved plan.","risks":["Loss or spatial bias in active-acoustic coverage","Quiet intervals too short for reverberation to decay or too long for the survey objective","Continuous machinery noise dominating despite transmitter silence","Operators mistaking planned muting for a malfunction","Metadata heartbeat failure making intentional absence ambiguous","Schedule pressure consuming the protected intervals","Unanticipated interactions with permits, mitigation duties, or equipment restart behavior"]},"next_evidence_step":"For one noncritical block, preregister aperture eligibility, duration, muted sources, ringdown criterion, override conditions, and active-coverage constraints. Collect synchronized transmitter, hydrophone, vessel-state, and metadata logs across ordinary and quiet intervals. Give blinded, shuffled excerpts to passive-acoustic analysts and compare their ability to identify interval state, estimate an ambient reference, and classify weak candidate events; separately audit lost active samples, restart behavior, safety overrides, and metadata completeness. Use the result only to decide whether a second bounded trial is warranted.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed; this sealed proposal was generated solely from the supplied archetype, mechanisms, and marine-science domain card, without consulting prior experiment candidates.","revision_record":{"parent_version":null,"progress_targets_addressed":["Produce one complete, testable reverse-innovation candidate","Preserve absence as the active causal intervention","Specify authority, safeguards, rivals, falsifiers, and bounded evidence"],"conceptual_changes":[],"operational_changes":[],"evidence_changes":[],"claim_changes":[]}}