TECHNICAL DOCUMENT AES TECHNICAL COUNCIL Document ESTD1001.0.01-05 Multichannel surround sound systems and operations AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 1
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B L 2 C 1 R β 1 β 2 30 120 100 LS RS (2 ß 1 = 33 ) (2 ß 2 = 48 ) C 0 1.2m* 0 * L, R 30 1.2m 0 LS, RS 100120 =1.2m 15 *) L/C/R and LS/RS ITU-R BS. 775-1 AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 5
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5.1 Signal source LFE L C R LS RS + 10dB Separation of low frequencies S Subwoofer L C R LS RS AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 7
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AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 9
6.2.1 ch Multichannel 2ch 2ch 2ch 2ch ( ) 2ch 10
6.2.2 < ± ± < ( ) AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 11
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6.2.3 6.2.4 ± ± AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 13
/ 40 Hz 16 khz 0 : 4dB : 4dB ±10 0 : 3dB 0 : 3dB ±30 0 : 4 db 0 : 4 db 0.5 db 0.5 db > 250 Hz to 2 khz 250 Hz 16 khz 8 db ± 2 db 6dB 12 db (SPL=96dB) <100 Hz >100 Hz -30 db (= 3%) -40 db (= 1%) -30 db (= 3%) -40 db (= 1%) 1/e ts[s] <5/f [Hz] <5/f [Hz] ts, 0.37 of the ( : 2.5/f) ( : 2.5/f) output level. δt 10µs 10µs L eff max >112 db >120 db ( IEC 268- (IEC 268-1 ) ) (IEC 268-5; 17.2) L noise 10dBA 10dBA 14
6.3 2.2T m T Tm+0.0 1.5T m 80Hz 250H z Tm- 2kHz 5kHz 8kHz AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 15
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7 1 L Left 2 R Right 3 C Center 4 LFE Low Frequency Enhancement 5 LS Left Surround 3dB 6 RS Right Surround 3dB 7 2/0 stereo mix 8 2/0 stereo mix 1 2 3 4 Lt/Rt 18
7.2.1 AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 19
7.4.1 L LISTref = 85 10 log n (dba). n L LISTref = 78 dba L LISTref = 85 20
1 khz L AS /ITU/SSF 1 khz L AS /SMPTE digital analog digital digital ref. db FS RMS ref. db L PMS RMS film/tape nw/m TPPM with τ <0.1 ms QPPM with τ = 10 ms 18 9 dbr (ARD/D: 113) (SMPTE: 233) 20 11 dbr SMPTE: 185 (ARD/D: 90) ARD/D: 320 (<2% THD) (SMPTE: 656) level L PMS 9 0 dbr (D = +6 dbu) SPL db lin SPL db C (slow) 18 18 --- - -- 20 20 9 9 SPL db A level L MS 30 21 dbr 30 30 18 9 13 82 81 78 20 Hz 20 khz SSF: 20 11 15 80 81 78 200 Hz 20 khz 18??? 81 78 250 Hz 4 khz 500 Hz 2 khz 18 85 82 SMPTE 500 Hz 4 khz 18 85 82 SSF/AES 500 Hz 2 khz 20 10 83 80 TMH Test Tape Simul.Progr.Sign. IEC 268-1 resp. ITU-Rep. 798 25 db 18 db 9 db 16 dbr 9 dbr 0 dbr 80 87 93? 77 84 93? AES TC-MBAT Information Document: Multichannel Su rround Sound Systems and Operations. 21
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[1] ITU-R BS. 775-1 Multichannel Stereophonic Sound System with and without accompanying Picture,Rec., International Telecommunications Union, Geneva, Switzerland (1992 1994). [2] SMPTE RP-173, Loudspeaker Placements for Audio Monitoring in High Definition Electronic Production,Rec., SMPTE N 15.04/152-300B, Society of Motion Picture and Television Engineers (1991). [3] SMPTE Channel Assignments and Levels on Multichannel Audio Media,Proposed Standard for TelevisionITU Information doc. ITU-R. 10C/11 and 10-11R/2 (1998 March 16). [4] EBU R22, Listening conditions for the assessment of sound programme material,rec., European Broadcasting Union (2000). For details see EBU Tech3276 with supp1.1. [5] T. Nousaine,Multiple subwoofers for home theatre,presented at the 103 rd Convention of the Audio Engineering Society, J. Audio Eng. Soc. (Abstracts), vol.45, p. 1015 (1997 Nov.), preprint 4558. [6] N. Zacharov, S. Bech, and D. Meares, The use of subwoofers in the context of surround sound program reproduction,j. Audio Eng. Soc. (Abstracts) vol.46, pp.276 287(1998 Apr.). [7] C. Kügler, and G. Theile,Loudspeaker reproduction: study on the subwoofer concept,presented at 92 nd Convention of the Audio Engineering Society, J. Audio Eng. Soc. (Abstracts), vol.40, p.437 (1992 May), preprint 3335. [8] D. Griesinger, Spatial impression and envelopment in small rooms, presented at the 103 rd Convention of the Audio Engineering Society, J. Audio Eng. Soc. (Abstracts), vol.45, p. 1013-1014 (1997 Nov.), preprint 4638. [9] ISO 1996, Onethird octave band background noise level limits noise rating curves NR,Rec., International Standards Organization, Geneva, Switzerland (1972). [10] ITU-R BS.1116-1, Methods for the subjective assessment of small impairments in audio systems including multichannel sound systems, Rec., International Telecommunications Union, Geneva, Switzerland (1997). [11] EBU R 91, Track allocations and recording levels for the exchange of multichannel recording,rec., European Broadcasting Union (1998); EBU R 96 Format for production and delively of multichannel programme, Rec., ibid. (2000). 24
[12] ITU-R BS. 1384, Parameters for international exchange of multi-channel sound recording, International Telecommunications Union, Geneva, Switzerland (1998). [13] N. Zacharov, and S. Bech, Multichannel level alignment, Part iv: the correlation between physical measures and subjective level calibration, presented at the 109 th Convention of the Audio Engineering Society, J. Audio Eng. Soc. (Abstracts), vol. 48, p. 1110 (2000 Nov.), preprint 5241. 25