JPPA 2002 THX pm3 Seminar - Lecture 1 · 2012. 6. 21. · (Dolby, DTS) , DVD-A, SACD, DTV etc. pm3...

JPPA 2002 THXpm3 Seminarby Masataka Nakahara

© 2002 SONA CORPORATION.

pp. A - 11st June 2002

thinks about the multi-channel studios.

JPPA2002_THXpm3

SONA CORPORATION2-19-9 Yayoi-cho Nakano-ku Tokyo 164-0013 Japan

P/ +81 3 5350 2621, F/ +81 3 5350 2670E/ [email protected], [email protected], [email protected]

Greeting from SONA



SONA is working for …

Acoustic design / Acoustical survey and measurement / Acoustical consultationArchitectural design and construction / Specially ordered furniture designTechnical support for audio makers / Study and research with acoustic lab

THX pm3 (Professional Multichannel Mixing and Monitoring) is a Studio designing program for a professional multichannel studio.

Dealer company of M&K professional loudspeakers

Representation company of Lucasfilm THX®pm3TM program- SONA is an only international rep. of THXpm3. -

1 / 2



Digest of SONA’s Works2 / 2


JPPA2002_THXpm3

THXpm3 project and SONA

THX and Lucasfilm are ©Lucasfilm Ltd. & TM. All rights are reserved. Used under authorization.

Copyright 2002 SONA CORPORATION



Advantages of THXpm3 studios

pm3 studio can maintain the accurate monitoring environment which is standardized by DVD-V (Dolby, DTS) , DVD-A, SACD, DTV etc.pm3 studio can take the monitoring environment which is tuned by the THX field technician. pm3 is a tailor-made program which can suit for any physical conditions and any usages of the studio.pm3 studio can maintain their monitoring specific without any self-measurement because of the annual measurement by the THX field technician．pm3 studio can have the well-matched monitoring environment between sound images and video images.pm3 studio can have the several monitoring environment at one site (e.g., both DVD-V and DVD-A).pm3 studio can use “THX®pm3™ Logo”.e.g., Catalogue of the studio

Credit of an end-roll DVD-V etc.Package Music etc.

1 / 4

pm3 = Professional Multi-channel Mixing and MonitoringAcoustic design and maintenance program for small / medium multichannel studios




THXpm3 Logos etc.

THXpm3 plaques

Mixed & Recorded in a

THX® pm3TM Certified Facility

THXpm3 Logos

2 / 4

pm3 = Professional Multi-channel Mixing and MonitoringAcoustic design and maintenance program for small / medium multichannel studios







THXpm3 project among Client, THX and SONA

pm3 = Professional Multi-channel Mixing and Monitoring

ClientStudio owner

SONA

￥Support fee￥Pre-measurement

Pre-tuning fee

＄Design, measurement fee

Manager

Accounting

Designer

Fieldtechnician

THX

＄THX CC4 fee

Trading directly

Agreement papers

Support of all progresses

Cooperation

Pre-tuning, Pre-measurementSupport of measurement works

on site

3 / 4

Acoustic design and maintenance program for small / medium multichannel studios




SONA supports THXpm3 project

pm3 = Professional Multi-channel Mixing and Monitoring

Project flow of THXpm3

4 / 4

Acoustic design and maintenance program for small / medium multichannel studios


Note ! THXpm3 room is certificated only by the THX people (not by SONA).

SONA can supports each or all processGeneral affairs

– Agreement papers, import of CC4, support of a certification measurementPlanning

– Acoustic design / consulting, system planningDrawing

– Planning drawings, Working drawingsConstructingMeasurement / tuning

– Room acoustic, loudspeaker response

ProposalRoom acoustic

Monitoring system

planning DrawingPlanning drawingWorking drawing

Constructing CertificateMeasurement

Tuning

Annualtesting


Copyright 2002 SONA CORPORATION

Jun 1st 2002

Some keys of Multichannel monitoring environment

Masataka NakaharaSONA Corporation

JPPA2002_THXpm3



Overview

1 / 21



Keys of Multichannel monitoring2 / 21

Multichannelformats

Bassmanagement

Timealignment

Loudspeakers’placement

Surround processingA/D, D/A, Compression

Record spec.Playback spec.

L/C/R, SUBDirect surroundDiffuse surround

Room acousticsLoudspeakers’ placement

Bass management controller

Comb filteringHaas effect

X-over of sub



Monitor flow3 / 21

L R C S3-1

Main BUS

L R C LFELS RS5.1

Mon

itor

BU

SR

ec. B

US

To Recorder

SW

LSRS

LRC

Master Vol.VU

Multichannelformats


Bassmanagement

Timealignment

L R2






Today’s special4 / 21

Multichannelformats

Bassmanagement

Timealignment


Surround processingA/D, D/A, Compression

Record spec.Playback spec.

L/C/R, SUBDirect surroundDiffuse surround

Room acousticsLoudspeakers’ placement

Bass management controller

Comb filteringHaas effect

X-over of sub



Direct / Diffuse surround environment- Loudspeakers’ placement -

5 / 21



L C R

SW

L C R

SW

Direct surround and Diffuse surround

Advantagesprecise phantom images (statical)

DrawbacksCompatibilities between different monitoring environments“Hot-spot” listening area

LS RS

＋＝

Direct Surround environment Diffuse Surround environment

RSLS

CL R

LS RS

ITU (100°～120°) 135° 150°

LS RS

CL R

LS RS

CL R

Music, Rec. ITU-R BS. 775-1 Movie, Postproduction

6 / 21

Advantagesambient, fly-over

(dynamic)Robust, generality

DrawbacksAmbiguous phantom images

Tripole ® by M&K.



GeneralityUltimate

Interchangeability

Direct Surround Diffuse Surround

CL R

LS RSLS RS

CL R

LS RS

CL R

Studios

End-users

LS RS

CL R

LS RS

CL R CL R

LS RS

×

○

△

7 / 21

Interchangeabilities



Monitoring impressions

LC

R

LS RS

Small room

85dBC84dBC

Out of area

Large room

LC

R

LS RS

“Hot-spot” listening

Large SPL differences “Headphone” images of LS and RS

8 / 21



-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000

r [mm]

Off-

axis

ang

le [°

]

Off-axis errors

-250mm

+250mm

L, R

LS, RS

1m < r < 5m

r=1m～5m

Δd = 250mm

+250 -250

θL,R = 30°

30

θLS,RS = 110°

110°

Off

-axi

s ang

le [d

egs]

0

+5

+10

+15

-5

-10

-15

+5°+3°

-6°-2.5°

1 1.5 2 2.5 3 3.5 4 4.5 5r [mm]

9 / 21

L

C

R

LS

RS






-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000

r [mm]

Off-

axis

ang

le [°

]

Off-axis errors

-250mm

+250mm

L, R

LS, RS

Off

-axi

s ang

le [°

]

0

+5

+10

+15

-5

-10

-15

+5°+3°

-6°-2.5°

1 1.5 2 2.5 3 3.5 4 4.5 5r [mm]

Small room / Large roomSmall roomFront / SurroundSurroundsForward / Backward・L,R Forward・LS,RS Backward

10 / 21

Which needs a WIDE dispersion speaker

LS, RS in a Small roomneeds

Wide dispersion speaker

Tripole ® by M&K.



SPL errors11 / 21

0

Small room : r=1.5m

Large room : r=4.0m

-35-30-25-20-15-10-5

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.5 5.0Distance from a source [m]

rela

tive

SPL

[dB

]

4.0

-0.8dB～1.0dB

-0.4dB～0.4dB

Small room 3.5m (W) ×4.0m (D)×2.2m (H)，r = 1.5mLarge room 10.0m (W)×15.0m (D)×6.0m (H)，r = 4.0m

Source : Q=2, Room :αave = 0.6

+250 -250

30

110°

L

C

R

LS

RSr = 1.5m, 4m

r=1.5m, 4m

Δd = 250mmθL,R = 30° θLS,RS = 110°



Bass management Controller- Bass management -

12 / 21



Why bass management is needed?13 / 21

31.5 50 80 125

200

315

500

800

1.25

k 2k3.

15k 5k 8k

12.5

k20

k

1/3 octave band center frequency [Hz]

20

20

-40

-30

-20

-10

0

10

12.5

Rel

ativ

e SP

L [d

B]

L=C=R=LS=RS

20 –120Hz 20 - 80Hz

+10dB

LFE ? ?



Ways of a Bass Management14 / 21

Room acousticAbsorption

– Almost 100% absorption90% … -10dB, 99.9999% … -60dBfc = 100Hz, Thickness ≒ 80cm

Loudspeakers’ placementAvailable for a SUB only.

Electric acousticBass Management Controller

– Bass redirection to SUB

Low frequency characteristics in a small / medium room

Standing waves, room modes, degeneracy



Bass management Controller

Bass Management

LCR

LSRS

LFE

LCR

LSRSSW+

+10dB+


15 / 21

Products

THX CC4Front face

Back panelAC

M&K : LFE-5






Advantages of Bass management controller

Bass Management

LCR

LSRS

LFE

LCR

LSRSSW+

+10dB+

16 / 21

Advantages in Low frequency

You can take same characteristics of each channel.You can take best characteristics on site for every channel.-Search the best position only for a SUB.You can tune the LFE gain (+10dB) easily and absolutely.You can take full-range (20-20kHz) characteristics.You can confirm “bass redirection” effect for DVD-V (Dolby DIGITAL).




If the sound using bass management don’t have any problems, it doesn’t have any problems on any room conditions.

>

<

Interference of low frequency sound

Bass ManagementConsumer Receiver

Differences of the Low frequency behavior

Acoustical summation Electrical summation

WithoutBass Management

Summation

Less interference Much more interferenceInterference Live (Diffuse) < Dead

RICH POORLive (Diffuse) > Dead

Auditory impression

tP

L

tP

R

t

P

L60Hz delay = 87msec t

P

L+R + R

17 / 21



Loudspeaker response 1

0

10

20

30

40

50

60

70

80

90

100

1/3 octave band center frequency [Hz]

BGN

Sample of a measurement data

Without Bass Management

18 / 21



Loudspeaker response 2

Sample of a measurement data

With Bass Management

19 / 21

0102030405060708090

100

1/3 octave band ce nte r fre que ncy [Hz ]

LFEL, R ave.LS, RS ave.CBGN

+10dBat

each band



Details of Bass management controllers20 / 21

LFE

LS

RS

L

R

C

+10dB

HPF

LPF

HPF

HPF

HPF

HPF

SUB

LS

RS

L

R

C

Bass Management 1 Bass Management 2

f [Hz]

SPL[dB]

80Hz, 24dB/oct

SW Main speaker

5chLFE

+10dB

+10dB?

f [Hz]

Main speaker

80Hz

HPF : 12dB/oct

LS

RS

L

R

C

HPF

HPF

HPF

HPF

HPF

SUB

LS

RS

L

R

C

LPF

LFE +10dB LPF’

, 24dBoct

Accurate tuning!



隔月間プロサウンドステレオサウンド社

2000.12 vol.100 Sony PCL 408 THX Suiteのアコースティックデザイン（前編）2001.2 vol.101 Sony PCL 408 THX Suiteのアコースティックデザイン（後編）2001.6 vol.103 ～マルチチャンネルスタジオのアコースティックデザイン（連載）

– 2001.6 vol.103 各種マルチチャンネル・フォーマットの概要– 2001.8 vol.103 再生特性– 2001.10vol.103 ベース・マネージメント– 2001.12vol.103 スピーカ配置– 2001.2 vol.103 再生環境の誤差– 2001.4 vol.103 モニター・システム

サラウンド制作ハンドブック沢口真生編兼六館出版

第3章サラウンドコントロールルーム設計– 中小規模のポスプロ・スタジオ設計

サウンドレコーディング技術概論社団法人日本スタジオ協会兼六館出版

第6章次世代音響技術– 6.2 マルチチャンネル再生

References21 / 21

JPPA 2002 THX pm3 Seminar - Lecture 1 · 2012. 6. 21. · (Dolby, DTS) , DVD-A, SACD, DTV etc. pm3...

Documents

Transcript of JPPA 2002 THX pm3 Seminar - Lecture 1 · 2012. 6. 21. · (Dolby, DTS) , DVD-A, SACD, DTV etc. pm3...