{"query": "Pitch — A440 and the measured reference", "count": 20, "results": [{"id": "card_music_pitch", "title": "Pitch — A440 and the measured reference", "shelf": "codex", "surface": "secular", "snippet": "Concert pitch fixes A above middle C at 440 Hz (MIDI note 69), sealed; the ensemble tunes to it under f = 440 * 2^((n-69)/12). Pitch is a measured frequency, and the interval arithmetic is sealed thro", "authority_tier": "engine_derived", "source": "Narrow Highway — music", "readable": false, "generated": false}, {"id": "card_theory_acoustic_wave_theory", "title": "Acoustic wave theory (harmonics, Doppler)", "shelf": "theories", "surface": "secular", "snippet": "Acoustic wave theory (harmonics, Doppler) — an engine domain that can touch it: acoustics. Calibration: seals — frequencies, harmonics and Doppler shifts compute. Sound is a PRESSURE wave in a medium,", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_heisenberg_uncertainty_principle", "title": "Heisenberg uncertainty principle", "shelf": "theories", "surface": "secular", "snippet": "Heisenberg uncertainty principle — an engine domain that can touch it: physics. Calibration: partial — the bound computes; the ontology is map-only. Δx·Δp ≥ ħ/2. Position and momentum cannot both be s", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_n_f7102828f542", "title": "Martyrdom of Polycarp II", "shelf": "patristics", "surface": "witness", "snippet": "All the martyrdoms, then, were blessed and noble which took place according to the will of God. For it becomes us who profess greater piety than others, to ascribe the authority over all things to God", "authority_tier": "father", "source": "Martyrdom of Polycarp (trans. Roberts-Donaldson, 1885)", "readable": false, "generated": false}, {"id": "card_bridge_theory_tuning_systems_comma__fundamental_theorem_of_arithmetic", "title": "Bridge: Tuning systems & the Pythagorean comma  ↔  Fundamental theorem of arithmetic (unique factorization)", "shelf": "bridges", "surface": "secular", "snippet": "Tuning systems & the Pythagorean comma and Fundamental theorem of arithmetic (unique factorization) are the same form in different domains. pitch ratios are integer factorizations; the comma is 3^12 a", "authority_tier": "reference", "source": "The Bridges — cross-domain isomorphisms", "readable": false, "generated": false}, {"id": "card_bridge_theory_music_theory__fourier_analysis___signal_processing", "title": "Bridge: Music theory (harmonic series, equal temperament)  ↔  Fourier analysis & signal processing", "shelf": "bridges", "surface": "secular", "snippet": "Music theory (harmonic series, equal temperament) and Fourier analysis & signal processing are the same form in different domains. timbre IS a spectrum -- what distinguishes a violin from a flute at t", "authority_tier": "reference", "source": "The Bridges — cross-domain isomorphisms", "readable": false, "generated": false}, {"id": "card_floor_acoustics", "title": "Acoustics — waves, loudness, and harmonics", "shelf": "codex", "surface": "secular", "snippet": "The physics of sound and hearing, standing between matter and mind. Sound is a pressure wave in a medium (v = f lambda); loudness is logarithmic (the decibel); pitch is frequency and timbre is the har", "authority_tier": "engine_derived", "source": "Narrow Highway — acoustics", "readable": false, "generated": false}, {"id": "card_acoustics_harmonics", "title": "Harmonics — pitch, timbre, phonons", "shelf": "codex", "surface": "secular", "snippet": "Pitch is frequency; a string also rings at integer multiples (the harmonic series), and their mix is timbre. The third harmonic of 220 Hz is 660 Hz (sealed). Quantized, a sound wave's quanta are PHONO", "authority_tier": "engine_derived", "source": "Narrow Highway — acoustics", "readable": false, "generated": false}, {"id": "card_floor_music", "title": "Music — interval, tuning, and the harmonic series", "shelf": "codex", "surface": "secular", "snippet": "Music is number made audible: the consonant intervals are small whole-number frequency ratios (octave 2:1, fifth 3:2, fourth 4:3), and a scale is a tuning that divides the octave — equal temperament b", "authority_tier": "engine_derived", "source": "Narrow Highway — music", "readable": false, "generated": false}, {"id": "card_src_etym_pitch", "title": "pitch", "shelf": "etymology", "surface": "secular", "snippet": "pitch: etymology (Webster 1913) — n.: [OE. pich, AS. pic, L. pix; akin to Gr. 1. A thick, black, lustrous, and sticky substance obtained by boiling down tar. It is used in calking the seams of ships; ", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_taxon_42064", "title": "Pinus elliottii — American pitch pine", "shelf": "taxonomy", "surface": "secular", "snippet": "American pitch pine (Pinus elliottii) — a species. In the tree of life under Pinus subgen. Pinus. Also known as: American pitch pine, longleaf pitch pine, slash pine, swamp pine.", "authority_tier": "reference", "source": "NCBI Taxonomy (public domain)", "readable": false, "generated": false}, {"id": "card_src_openstax_entrepreneurship_7_3_developing_pitches_for_various_audie_80f2fd80", "title": "7.3 Developing Pitches for Various Audiences and Goals — Entrepreneurship", "shelf": "reference", "surface": "secular", "snippet": "7.3\n\nDeveloping Pitches for Various Audiences and Goals\n\nPortions of the material in this section are based on original work by Mark Poepsel and produced with support from the Rebus Community. The ori", "authority_tier": "reference", "source": "OpenStax: Entrepreneurship (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_entrepreneurship_key_terms_9500175f", "title": "Key Terms — Entrepreneurship", "shelf": "reference", "surface": "secular", "snippet": "Key Terms\n\nask\nspecific amount of money or type of assistance requested in a pitch\n\ncorporate narrative\nstory about how a successful company grew from something small into something broad and powerful", "authority_tier": "reference", "source": "OpenStax: Entrepreneurship (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_entrepreneurship_discussion_questions_a04d6e77", "title": "Discussion Questions — Entrepreneurship", "shelf": "reference", "surface": "secular", "snippet": "Discussion Questions\n\n1.\n\nAfter a search, give examples of companies with clear vision but poorly defined mission statements.\n\n2.\n\nWhat are the pitfalls in crafting a vision statement that is too broa", "authority_tier": "reference", "source": "OpenStax: Entrepreneurship (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_etym_pay", "title": "pay", "shelf": "etymology", "surface": "secular", "snippet": "pay: etymology (Webster 1913) — v. t.: [OF. peier, fr. L. picare to pitch, i pitch: cf. OF. peiz pitch, F. poix. See Pitch a black substance.]; v. t.: [OE. paien, F. payer, fr. L. pacare to pacify, ap", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_topic_nave_pitch", "title": "Pitch — topical index", "shelf": "topical", "surface": "witness", "snippet": "Pitch — where Scripture speaks to it.\n\n  · Isaiah 34:9\n  · Genesis 6:14\n  · Exodus 2:3\n\n3 passage(s), indexed by Nave's Topical Bible. The topic and its references are the knowledge taken; the work's ", "authority_tier": "reference", "source": "Nave's Topical Bible (Orville J. Nave, 1897) — Public Domain (CrossWire SWORD)", "readable": false, "generated": false}, {"id": "card_src_pron_pitch", "title": "pitch", "shelf": "pronunciation", "surface": "secular", "snippet": "pitch: pronounced (ARPABET) P IH1 CH. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "readable": false, "generated": false}, {"id": "card_src_book_71819", "title": "The statistomat pitch — Chandler Davis", "shelf": "gutenberg", "surface": "secular", "snippet": "The statistomat pitch, by Chandler Davis. Subjects: Science fiction; Short stories; Sales personnel -- Fiction; Business -- Fiction. Read the full text (public domain): https://www.gutenberg.org/ebook", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_fed_resistanceofpond387hoff", "title": "Resistance of ponderosa pine to the gouty pitch midge (Cecidomyia piniinopis)", "shelf": "ecology", "surface": "secular", "snippet": "Resistance of ponderosa pine to the gouty pitch midge (Cecidomyia piniinopis). A United States federal publication, public domain (17 USC 105). The full text (13,220 bytes) is held on the ark; waybill", "authority_tier": "reference", "source": "US Forest Service publications (PD, 17 USC 105)", "readable": true, "generated": false}, {"id": "card_src_etym_picea", "title": "picea", "shelf": "etymology", "surface": "secular", "snippet": "picea: etymology (Webster 1913) — n.: [L., the pitch pine, from pix, picis, pitch.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_music_pitch"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}