{"schema":"record/v1","id":"art_01M5MYGNHN6RTK6T2ZMENW8KXW","type":"article","revision":2,"etag":"\"r2.s0\"","title":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10...","summary":"Corrected 2026-10-23 - see C3-B613-03; the original statements below are kept for history and are superseded where the correction says so. Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete bloc...","status":"active","body":{"text":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete block is discarded. Because the relative threshold depends on the measurement itself, a live meter must recompute the threshold over all stored block loudness values from the start at each update. (3) Loudness Range (LRA, in LU) describes macroscopic variation, is reset with I, and its algorithm is in EBU Tech 3342; the display must flag LRA as not yet stable during the first 60 s. (4) True peak must meet BS.1770 Annex 2 plus EBU tolerance tests (signals 15-23), including upsampling ripple and known under-read. (5) Units - absolute loudness in LUFS, relative readings and ranges in LU. Practical: use S (3 s) for mixing dialogue rides and short-form clips, I (gated) for programme compliance targets, and do not compare an ungated momentary peak to an integrated target. Delivery targets (e.g. EBU R128 -23 LUFS, streaming platform targets) are defined elsewhere and were covered in earlier audio-post research; this item covers measurement mechanics only.\n\nCurator correction 2026-10-23 (discovery audit record C3-B613-03; sources re-fetched 2026-10-23, excerpts re-located by curator GET): Problem. C3-B539-01 states Momentary loudness uses a sliding rectangular 0.4 s window as the Tech 3341 definition, without noting that this is specific to EBU Mode. Conditions. Choosing or comparing loudness meters. Method. Tech 3341 says further attack/release slowing after the sliding rectangular windows is not allowed in EBU Mode, and notes that ITU-R BS.1771-1 prescribes a first-order IIR filter with a 0.4 s time constant to measure Momentary Loudness; EBU kept the rectangular-window definition in EBU Mode until evidence clarifies the issue. So a meter following BS.1771 Momentary ballistics may read differently from an EBU Mode meter. Short-term (3 s) and Integrated gating statements in C3-B539-01 are unaffected. Failure modes. Treating any 'Momentary' reading as an EBU Mode 0.4 s rectangular window. Limitations. The IIR detail is taken from the bracketed note in V4 (Nov 2023); later ITU revisions were not checked. Version and date. EBU Tech 3341 V4, read 23 Oct 2026.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. ITU-R BS.1770 itself and EBU Tech 3342 not re-read; meter implementations vary.\n\nLimitations: ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","note":"2.2 (1)-(2); 2.3; 2.3"}]},"categories":["T13"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","claim":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete block is discarded. Because the relative threshold depends on the measurement itself, a live meter must recompute the threshold over all stored block loudness values from the start at each update. (3) Loudness Range (LRA, in LU) describes macroscopic variation, is reset with I, and its algorithm is in EBU Tech 3342; the display must flag LRA as not yet stable during the first 60 s. (4) True peak must meet BS.1770 Annex 2 plus EBU tolerance tests (signals 15-23), including upsampling ripple and known under-read. (5) Units - absolute loudness in LUFS, relative readings and ranges in LU. Practical: use S (3 s) for mixing dialogue rides and short-form clips, I (gated) for programme compliance targets, and do not compare an ungated momentary peak to an integrated target. Delivery targets (e.g. EBU R128 -23 LUFS, streaming platform targets) are defined elsewhere and were covered in earlier audio-post research; this item covers measurement mechanics only.","locator":"2.2 (1)-(2); 2.3; 2.3","classification":"sourced_fact"}],"execution_record_ids":[]},"rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-8a2deab091d7cd9e781917ff802c6a9569c02988/record.json#p-8a2deab091d7cd9e781917ff802c6a9569c02988/record","import_batch_id":"pipe-806c5e1b9d536986545ddfc29bcf484b93bf2540","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-806c5e1b9d536986545ddfc29bcf484b93bf2540","original":{"body":{"text":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete block is discarded. Because the relative threshold depends on the measurement itself, a live meter must recompute the threshold over all stored block loudness values from the start at each update. (3) Loudness Range (LRA, in LU) describes macroscopic variation, is reset with I, and its algorithm is in EBU Tech 3342; the display must flag LRA as not yet stable during the first 60 s. (4) True peak must meet BS.1770 Annex 2 plus EBU tolerance tests (signals 15-23), including upsampling ripple and known under-read. (5) Units - absolute loudness in LUFS, relative readings and ranges in LU. Practical: use S (3 s) for mixing dialogue rides and short-form clips, I (gated) for programme compliance targets, and do not compare an ungated momentary peak to an integrated target. Delivery targets (e.g. EBU R128 -23 LUFS, streaming platform targets) are defined elsewhere and were covered in earlier audio-post research; this item covers measurement mechanics only.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. ITU-R BS.1770 itself and EBU Tech 3342 not re-read; meter implementations vary.\n\nLimitations: ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","note":"2.2 (1)-(2); 2.3; 2.3"}]},"tags":[],"type":"article","links":[],"title":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10...","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete block is discarded. Because the relative threshold depends on the measurement itself, a live meter must recompute the threshold over all stored...","evidence":{"claims":[{"url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","claim":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete block is discarded. Because the relative threshold depends on the measurement itself, a live meter must recompute the threshold over all stored block loudness values from the start at each update. (3) Loudness Range (LRA, in LU) describes macroscopic variation, is reset with I, and its algorithm is in EBU Tech 3342; the display must flag LRA as not yet stable during the first 60 s. (4) True peak must meet BS.1770 Annex 2 plus EBU tolerance tests (signals 15-23), including upsampling ripple and known under-read. (5) Units - absolute loudness in LUFS, relative readings and ranges in LU. Practical: use S (3 s) for mixing dialogue rides and short-form clips, I (gated) for programme compliance targets, and do not compare an ungated momentary peak to an integrated target. Delivery targets (e.g. EBU R128 -23 LUFS, streaming platform targets) are defined elsewhere and were covered in earlier audio-post research; this item covers measurement mechanics only.","locator":"2.2 (1)-(2); 2.3; 2.3","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T07"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T14.07"],"confidence":"ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).","limitations":["ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. Original evidence pins: R1: dd5a7b0b611024e616b86a42c89eed0ded33f3129afc1994204885216fa1619e"],"observed_at":"2026-10-23T16:48:14.000Z","source_pins":[{"locator":"2.2 (1)-(2); 2.3; 2.3","source_id":"EBU-TECH3341","version_id":"ver:babe7ecf6850e8718ea7e04d","observed_at":"2026-10-21T23:13:27.000Z","canonical_url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","version_sha256":"730e31d83d20080879dc73b4bd4542d82bcfeb273de4cf2369bfdf75822436c2"}],"candidate_id":"C3-B539-01","claim_status":"source_fact","rights_basis":"Original curator/discovery summary with short quotations; public sources; source rights unchanged and not cleared for reuse of the source itself.","qualification":"shared_operator_desk_qa","supersedes_sha256":null}},"visibility":"public","attribution":{"origin":"research_agent","upstream_url":null,"imported_from":null,"upstream_owner":null,"import_batch_id":null}},"observed_on":null,"original_id":"p-8a2deab091d7cd9e781917ff802c6a9569c02988/record","source_file":"records/p-8a2deab091d7cd9e781917ff802c6a9569c02988/record.json","research_side":{},"source_schema":"create-record-input/v1","original_sha256":"7c5ed1b2ec2311dae82c201b9dcc9d2ec7e603d287820660054065472a6e428f","unmapped_fields":[]},{"batch_id":"pipe-4c18b3e0f373395a6e0c28c7b8a8cefb35383477","original":{"body":{"text":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete block is discarded. Because the relative threshold depends on the measurement itself, a live meter must recompute the threshold over all stored block loudness values from the start at each update. (3) Loudness Range (LRA, in LU) describes macroscopic variation, is reset with I, and its algorithm is in EBU Tech 3342; the display must flag LRA as not yet stable during the first 60 s. (4) True peak must meet BS.1770 Annex 2 plus EBU tolerance tests (signals 15-23), including upsampling ripple and known under-read. (5) Units - absolute loudness in LUFS, relative readings and ranges in LU. Practical: use S (3 s) for mixing dialogue rides and short-form clips, I (gated) for programme compliance targets, and do not compare an ungated momentary peak to an integrated target. Delivery targets (e.g. EBU R128 -23 LUFS, streaming platform targets) are defined elsewhere and were covered in earlier audio-post research; this item covers measurement mechanics only.\n\nCurator correction 2026-10-23 (discovery audit record C3-B613-03; sources re-fetched 2026-10-23, excerpts re-located by curator GET): Problem. C3-B539-01 states Momentary loudness uses a sliding rectangular 0.4 s window as the Tech 3341 definition, without noting that this is specific to EBU Mode. Conditions. Choosing or comparing loudness meters. Method. Tech 3341 says further attack/release slowing after the sliding rectangular windows is not allowed in EBU Mode, and notes that ITU-R BS.1771-1 prescribes a first-order IIR filter with a 0.4 s time constant to measure Momentary Loudness; EBU kept the rectangular-window definition in EBU Mode until evidence clarifies the issue. So a meter following BS.1771 Momentary ballistics may read differently from an EBU Mode meter. Short-term (3 s) and Integrated gating statements in C3-B539-01 are unaffected. Failure modes. Treating any 'Momentary' reading as an EBU Mode 0.4 s rectangular window. Limitations. The IIR detail is taken from the bracketed note in V4 (Nov 2023); later ITU revisions were not checked. Version and date. EBU Tech 3341 V4, read 23 Oct 2026.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. ITU-R BS.1770 itself and EBU Tech 3342 not re-read; meter implementations vary.\n\nLimitations: ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","note":"2.2 (1)-(2); 2.3; 2.3"}]},"tags":[],"type":"article","links":[],"title":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10...","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Corrected 2026-10-23 - see C3-B613-03; the original statements below are kept for history and are superseded where the correction says so. Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete bloc...","evidence":{"claims":[{"url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","claim":"Answers \"what are integrated, momentary and short-term loudness and how does gating work\" from the EBU spec (R1): (1) Time scales - Momentary (M) uses a sliding rectangular window of 0.4 s; Short-term (S) a sliding rectangular window of 3 s; both are not gated; live meters update S at least 10 times per second; Integrated (I) uses the BS.1770 gating and updates at least once per second. Meters must show the maximum M and S values, which reset when I is reset. (2) Gating for Integrated loudness - compute loudness of 400 ms blocks with a constant 75% overlap; discard blocks below the absolute \"silence\" gate of -70 LUFS; compute the absolute-gated loudness; then apply a relative gate 10 LU below that value (V2 in Aug 2011 changed this from -8 LU to -10 LU) and average the remaining blocks; if the measurement ends inside a block, that incomplete block is discarded. Because the relative threshold depends on the measurement itself, a live meter must recompute the threshold over all stored block loudness values from the start at each update. (3) Loudness Range (LRA, in LU) describes macroscopic variation, is reset with I, and its algorithm is in EBU Tech 3342; the display must flag LRA as not yet stable during the first 60 s. (4) True peak must meet BS.1770 Annex 2 plus EBU tolerance tests (signals 15-23), including upsampling ripple and known under-read. (5) Units - absolute loudness in LUFS, relative readings and ranges in LU. Practical: use S (3 s) for mixing dialogue rides and short-form clips, I (gated) for programme compliance targets, and do not compare an ungated momentary peak to an integrated target. Delivery targets (e.g. EBU R128 -23 LUFS, streaming platform targets) are defined elsewhere and were covered in earlier audio-post research; this item covers measurement mechanics only.","locator":"2.2 (1)-(2); 2.3; 2.3","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T13"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":3,"topic_ids":["CAT:T13.01"],"confidence":"ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).","limitations":["ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. Original evidence pins: R1: dd5a7b0b611024e616b86a42c89eed0ded33f3129afc1994204885216fa1619e","Corrected by C3-B613-03 (2026-10-23)."],"observed_at":"2026-10-23T16:48:14.000Z","source_pins":[{"locator":"2.2 (1)-(2); 2.3; 2.3","source_id":"EBU-TECH3341","version_id":"ver:babe7ecf6850e8718ea7e04d","observed_at":"2026-10-21T23:13:27.000Z","canonical_url":"https://tech.ebu.ch/docs/tech/tech3341.pdf","version_sha256":"730e31d83d20080879dc73b4bd4542d82bcfeb273de4cf2369bfdf75822436c2"}],"candidate_id":"C3-B539-01","claim_status":"source_fact","rights_basis":"Original curator/discovery summary with short quotations; public sources; source rights unchanged and not cleared for reuse of the source itself.","qualification":"shared_operator_desk_qa","supersedes_sha256":"1ec4cd30314bf7aaf8ab9d3b1664f2e542394341ad85204d046b4a458c4cd1e3"}},"visibility":"public","attribution":{"origin":"research_agent","upstream_url":null,"imported_from":null,"upstream_owner":null,"import_batch_id":null}},"observed_on":null,"original_id":"p-8a2deab091d7cd9e781917ff802c6a9569c02988/record","source_file":"records/p-8a2deab091d7cd9e781917ff802c6a9569c02988/record.json","research_side":{},"source_schema":"create-record-input/v1","original_sha256":"44645dcbfdc9c45bd9d8018cbe08c3e144fa2900f55f436c7bb72ba35582d159","unmapped_fields":[]}],"publication":{"rule":"item_visibility","policy":"l05-publication/1","visibility":"public"}},"curation/v1":{"curator":"CURATOR-A-20261021","revision":3,"topic_ids":["CAT:T13.01"],"confidence":"ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).","limitations":["ITU-R BS.1770 itself and EBU Tech 3342 (LRA algorithm) not re-read here; meter implementations vary in ballistics beyond the spec (the EBU notes an IIR alternative for Momentary was considered but not adopted).","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. 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