Dolby Laboratories 585 Manuale utente

Marca: Dolby Laboratories

Modello: 585

Tipo: Manuale utente

Questo manuale è adatto anche per

Stereo System 585

Model 585

Time Scaling Processor

Issue 2 Part Number 91796

Model 585 Time Scaling Processor

Dolby Laboratories, Inc.

Corporate Headquarters

Dolby Laboratories, Inc.

100 Potrero Avenue

San Francisco, CA 94103-4813

Telephone 415-558-0200

Fax 415-863-1373

www.dolby.com

European Headquarters

Dolby Laboratories, Inc.

Wootton Bassett

Wiltshire, SN4 8QJ, England

Telephone (44) 1793-842100

Fax (44) 1793-842101

DISCLAIMER OF WARRANTIES:

EQUIPMENT MANUFACTURED BY DOLBY LABORATORIES IS WARRANTED AGAINST DEFECTS IN

MATERIALS AND WORKMANSHIP FOR A PERIOD OF ONE YEAR FROM THE DATE OF PURCHASE.

THERE ARE NO OTHER EXPRESS OR IMPLIED WARRANTIES AND NO WARRANTY OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR OF NONINFRINGEMENT OF

THIRD-PARTY RIGHTS (INCLUDING, BUT NOT LIMITED TO, COPYRIGHT AND PATENT RIGHTS).

LIMITATION OF LIABILITY:

IT IS UNDERSTOOD AND AGREED THAT DOLBY LABORATORIES’ LIABILITY, WHETHER IN

CONTRACT, IN TORT, UNDER ANY WARRANTY, IN NEGLIGENCE, OR OTHERWISE SHALL NOT

EXCEED THE COST OF REPAIR OR REPLACEMENT OF THE DEFECTIVE COMPONENTS OR ACCUSED

INFRINGING DEVICES, AND UNDER NO CIRCUMSTANCES SHALL DOLBY LABORATORIES BE

LIABLE FOR INCIDENTAL, SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES,

(INCLUDING, BUT NOT LIMITED TO, DAMAGE TO SOFTWARE OR RECORDED AUDIO OR VISUAL

MATERIAL), COST OF DEFENSE, OR LOSS OF USE, REVENUE, OR PROFIT, EVEN IF DOLBY

LABORATORIES OR ITS AGENTS HAVE BEEN ADVISED, ORALLY OR IN WRITING, OF THE

POSSIBILITY OF SUCH DAMAGES.

Dolby and the double-D symbol are registered trademarks of Dolby Laboratories. Part Number 91796

All other trademarks remain the property of their respective owners. Issue 2

Model 585 Time Scaling Processor

iii

Table of Contents

List of Figures................................................................................................................v

List of Tables .................................................................................................................v

Regulatory Notices....................................................................................................... vi

Fusing Information ...................................................................................viii

Chapter 1 Introduction...........................................................................................1-1

Chapter 2 Getting Started......................................................................................2-1

2.1 Unpacking and Inspection............................................................2-1

2.2 Installing.......................................................................................2-1

2.3 Rear Panel ...................................................................................2-2

2.3.1 Digital Audio Connections ................................................2-2

2.3.2 Serial Connection Ports....................................................2-3

2.3.3 Remote Connection Ports ................................................2-4

2.4 Front Panel...................................................................................2-4

2.4.1 Reading the Display .........................................................2-5

2.4.2 Buttons.............................................................................2-5

2.4.3 Knob.................................................................................2-6

2.5 Status Menu.................................................................................2-7

2.6 Setup Menu..................................................................................2-8

2.6.1 Program Configuration .....................................................2-8

2.6.2 Operating Mode................................................................2-9

2.6.3 System Settings .............................................................2-11

Chapter 3 Time Scaling..........................................................................................3-1

3.1 Transport Menu............................................................................3-1

3.1.1 Play ..................................................................................3-2

3.1.2 Record..............................................................................3-5

3.1.3 Program Selection............................................................3-5

3.2 Time Scaling of Longer Programs................................................3-6

Chapter 4 Pitch Shifting.........................................................................................4-1

4.1 Adjusting the Pitch Shifting Value.................................................4-1

4.2 Using Pitch Shifting to Perform Online Time Scaling....................4-2

Chapter 5 Applications...........................................................................................5-1

5.1 Stand-Alone Processing...............................................................5-1

5.2 Processing with Synchronized Video............................................5-2

Model 585 Time Scaling Processor

Chapter 6 Principles of Operation.........................................................................6-1

6.1 Multichannel Delivery ...................................................................6-1

6.2 Development of Time Scaling.......................................................6-2

6.2.1 Time-Domain Solutions....................................................6-2

6.2.2 Frequency-Domain Solutions...........................................6-2

6.2.3 Modeling-Based Solutions................................................6-3

6.2.4 Choosing a Solution .........................................................6-3

6.3 Intelligent Analysis........................................................................6-3

Chapter 7 Reference Data......................................................................................7-1

7.1 Channel Mapping .........................................................................7-1

7.2 Specifications...............................................................................7-2

Model 585 Time Scaling Processor

List of Figures

Figure 1 Checking the Main Fuse..................................................................................viii

Figure 2-1 Connections: Signal In and Out...................................................................2-2

Figure 2-2 Connections: Remote RS-232, GP I/O, Metadata In and Out.....................2-3

Figure 2-3 Model 585 Front Panel................................................................................2-4

Figure 2-4 Front-Panel Buttons ....................................................................................2-5

Figure 5-1 Stand-Alone Time Scaling...........................................................................5-2

Figure 5-2 Single-Pass Pitch Shifting ...........................................................................5-3

List of Tables

Table 2-1 Front-Panel Button Definitions......................................................................2-6

Table 2-2 Status Menu Screens...................................................................................2-7

Table 3-1 Play Menu Button Mapping ..........................................................................3-2

Table 7-1 Channel Mapping according to Program Configuration................................7-1

Model 585 Time Scaling Processor

Regulatory Notices

USA

This equipment has been tested and found to comply with the limits for a Class A digital device,

pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection

against harmful interference when the equipment is operated in a commercial environment. This

equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in

accordance with this instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference in which case

the user will be required to correct the interference at his or her own expense.

WARNING: Troubleshooting must be performed by a trained technician. Do

not attempt to service this equipment unless you are qualified to do so.

Check that the correct fuses have been installed. To reduce the risk of fire,

replace only with fuses of the same type and rating.

Exposed portions of the power supply assembly are electrically “hot.” To reduce risk of electric

shock, the power cord

must be disconnected when the power supply assembly is removed.

The ground terminal of the power plug is connected directly to

the chassis of the unit. For continued protection against

electric shock, a correctly wired and grounded (earthed) three-

pin power outlet must be used. Do not use a ground-lifting

adapter and never cut the ground pin on the three-prong plug.

WARNING: Before applying power, check the main fuse using the procedure on

page viii.

Canada

This Class A digital apparatus complies with Canadian ICES-003.

This equipment complies with the EMC requirements of EN55103-1 and EN55103-2 when

operated in an E2 environment in accordance with this manual.

Use power cord Dolby part number 92031 supplied with unit (pre-fitted with 13A plug to

BS1363) to connect Model 585 to the mains supply. This equipment must be earthed.

Model 585 Time Scaling Processor

vii

IMPORTANT SAFETY NOTICE

This unit complies with the safety standard EN60065. The unit shall not be exposed to dripping or splashing and no objects filled with liquids,

such as coffee cups, shall be placed on the equipment. To ensure safe operation and to guard against potential shock hazard or risk of fire, the

following must be observed:

o Ensure that your mains supply is in the correct range for the input power requirement of the unit.

o Ensure fuses fitted are the correct rating and type as marked on the unit.

o The unit must be earthed by connecting to a correctly wired and earthed power outlet.

o The power cord supplied with this unit must be wired as follows:

Live—Brown Neutral—Blue Earth—Green/Yellow

IMPORTANT – NOTE DE SECURITE

Ce materiel est conforme à la norme EN60065. Ne pas exposer cet appareil aux éclaboussures ou aux gouttes de liquide. Ne pas poser d'objets

remplis de liquide, tels que des tasses de café, sur l'appareil. Pour vous assurer d'un fonctionnement sans danger et de prévenir

tout choc électrique ou tout risque d'incendie, veillez à observer les recommandations suivantes.

o Le selecteur de tension doit être placé sur la valeur correspondante à votre alimentation réseau.

o Les fusibles doivent correspondre à la valeur indiquée sur le materiel.

o Le materiel doit être correctement relié à la terre.

o Le cordon secteur livré avec le materiel doit être cablé de la manière suivante:

Phase—Brun Neutre—Bleu Terre—Vert/Jaune

WICHTIGER SICHERHEITSHINWEIS

Dieses Gerät entspricht der Sicherheitsnorm EN60065. Das Gerät darf nicht mit Flüssigkeiten (Spritzwasser usw.) in Berührung kommen; stellen

Sie keine Gefäße, z.B. Kaffeetassen, auf das Gerät. Für das sichere Funktionieren des Gerätes und zur Unfallverhütung (elektrischer Schlag,

Feuer) sind die folgenden Regeln unbedingt einzuhalten:

o Der Spannungswähler muß auf Ihre Netzspannung eingestellt sein.

o Die Sicherungen müssen in Typ und Stromwert mit den Angaben auf dem Gerät übereinstimmen.

o Die Erdung des Gerätes muß über eine geerdete Steckdose gewährleistet sein.

o Das mitgelieferte Netzkabel muß wie folgt verdrahtet werden:

Phase—braun Nulleiter—blau Erde—grün/gelb

NORME DI SICUREZZA – IMPORTANTE

Questa apparecchiatura è stata costruita in accordo alle norme di sicurezza EN60065. Il prodotto non deve essere sottoposto a schizzi, spruzzi e

gocciolamenti, e nessun tipo di oggetto riempito con liquidi, come ad esempio tazze di caffè, deve essere appoggiato sul dispositivo. Per una

perfetta sicurezza ed al fine di evitare eventuali rischi di scossa êlettrica o d'incendio vanno osservate le seguenti misure di sicurezza:

o Assicurarsi che il selettore di cambio tensione sia posizionato sul valore corretto.

o Assicurarsi che la portata ed il tipo di fusibili siano quelli prescritti dalla casa costruttrice.

o L'apparecchiatura deve avere un collegamento di messa a terra ben eseguito; anche la connessione rete deve

avere un collegamento a terra.

o Il cavo di alimentazione a corredo dell'apparecchiatura deve essere collegato come segue:

Filo tensione—Marrone Neutro—Blu Massa—Verde/Giallo

AVISO IMPORTANTE DE SEGURIDAD

Esta unidad cumple con la norma de seguridad EN60065. La unidad no debe ser expuesta a goteos o salpicaduras y no deben colocarse sobre el

equipo recipientes con liquidos, como tazas de cafe. Para asegurarse un funcionamiento seguro y prevenir cualquier posible peligro de descarga o

riesgo de incendio, se han de observar las siguientes precauciones:

o Asegúrese que el selector de tensión esté ajustado a la tensión correcta para su alimentación.

o Asegúrese que los fusibles colocados son del tipo y valor correctos, tal como se marca en la unidad.

o La unidad debe ser puesta a tierra, conectándola a un conector de red correctamente cableado y puesto a tierra.

o El cable de red suministrado con esta unidad, debe ser cableado como sigue:

Vivo—Marrón Neutro—Azul Tierra—Verde/Amarillo

VIKTIGA SÄKERHETSÅTGÄRDER

Denna enhet uppfyller säkerhetsstandard EN60065. Enheten får ej utsättas för yttre åverkan samt föremål innehållande vätska, såsom

kaffemuggar, får ej placeras på utrustningen." För att garantera säkerheten och gardera mot eventuell elchock eller brandrisk, måste följande

observeras:

o Kontrollera att spänningsväljaren är inställd på korrekt nätspänning.

o Konrollera att säkringarna är av rätt typ och för rätt strömstyrka så som anvisningarna på enheten föreskriver.

o Enheten måste vara jordad genom anslutning till ett korrekt kopplat och jordat el-uttag.

o El-sladden som medföljer denna enhet måste kopplas enligt foljande:

Fas—Brun Neutral—Blå Jord—Grön/Gul

BELANGRIJK VEILIGHEIDS-VOORSCHRIFT

Deze unit voldoet aan de EN60065 veiligheids-standaards. Dit apparaat mag niet worden blootgesteld aan vocht. Vanwege het risico dat er

druppels in het apparaat vallen, dient u er geen vloeistoffen in bekers op te plaatsen. Voor een veilig gebruik en om het gevaar van electrische

schokken en het risico van brand te vermijden, dienen de volgende regels in acht te worden genomen:

o Controleer of de spanningscaroussel op het juiste Voltage staat.

o Gebruik alleen zekeringen van de aangegeven typen en waarden.

o Aansluiting van de unit alleen aan een geaarde wandcontactdoos.

o De netkabel die met de unit wordt geleverd, moet als volgt worden aangesloten:

Fase—Bruin Nul—Blauw Aarde—Groen/Geel

Model 585 Time Scaling Processor

viii

Fusing Information

WARNING: To reduce the risk of fire, replace fuses only with the same type

and rating.

The unit uses a universal switching power supply that handles the full range of nominal

mains voltages between 90 and 264 VAC and any frequency between 50 and 60 Hz.

Check Main Fuse

The Main fuse rating is:

T 1A L (1 Amp, 250 V, 20 mm, time-lag, low-breaking capacity) for all operating

voltages.

WARNING: The power to the unit must be off when the following steps are

performed. Ensure that the main power cable to the unit is not connected to a

power source.

1. Open the fuse compartment door in the AC power input housing with a small flat-

blade screwdriver (Figure 1). Carefully pull out the fuse carrier.

Check that the fuse has the correct rating. The fuse carrier must be inserted into

the compartment with the orientation shown in Figure 1.

Do not force the carrier

into the compartment or both could be damaged.

Snap the fuse compartment door closed.

Fuse carrier

Installed fuse

Open the door

Figure 1 Checking the Main Fuse

Internal Fuse

The switching power supply contains a separate fuse. Most fault conditions should be

protected by the main fuse.

If you find it necessary to replace the internal fuse, be certain to replace it with a fuse

of the same type and rating as printed on the switching power supply board.

Model 585 Time Scaling Processor

1-1

Chapter 1

Introduction

The Model 585 Time Scaling Processor delivers true time scaling and pitch shifting

for the studio professional.

A change in the playback speed of analog tape—or in the sample playback rate for

digital formats—has always brought about a change in the audio pitch as well as the

duration of the audio program being played. However, this fixed link between

playback speed and pitch has often meant a compromise in audio quality. Therefore,

the ability to precisely determine and alter pitch and program duration

independently

has been a necessity since it first became possible to alter the speed of a recording.

Today, many standard operations result in a change in audio pitch; for example, when

converting a film for broadcast at 25 fps, or adjusting a program’s length to match the

available broadcast time slot.

There have been attempts over the years to provide pitch shifting and time scaling.

Early products showed glaring weaknesses, and more recent attempts have tended to

be useful only on a limited range of material. Model 585 delivers dependable

processing of any signal, across the whole spectrum of audio: music, speech, special

effects, and any combination of these elements.

Multichannel Delivery

Model 585 is the first product to deliver truly phase-synchronous time scaling and

pitch shifting for multiple (up to eight) channels of audio—something multiple stereo

processors cannot achieve. It is important to preserve the phase relationship of

multichannel audio programs for all listeners; it is especially important for those with

stereo or mono reproduction equipment, who hear a summing of the multichannel

elements. Model 585 is compatible with all Dolby

E products.

Real-Time Time Scaling and Pitch Shifting

Model 585 delivers two separate functions: time scaling and pitch shifting. Each

function can be applied in real time.

Time scaling alters the duration of an audio signal but leaves the perceived pitch

unchanged from the original signal. Time scaling and how to implement it using

Model 585 is discussed in Chapter 3.

Model 585 Time Scaling Processor Introduction

1-2

Pitch shifting, sometimes referred to in other documents as pitch scaling, alters the

perceived frequency of the audio signal from that of the original signal, while leaving

the duration of the signal the same as the original. Pitch shifting and its

implementation using Model 585 is covered in Chapter 4.

Model 585 Time Scaling Processor

2-1

Chapter 2

Getting Started

This chapter covers connection requirements for Model 585 and the basics of using

the front-panel controls.

2.1 Unpacking and Inspection

Before unpacking Model 585, inspect the outer carton for shipping damage. If the

carton shows damage, inspect Model 585 in the associated areas. The BNC

connectors on the rear panel are covered with protective plastic caps.

The following items are provided with Model 585:

• Three power cords: one each for US, continental Europe, and the UK. Use the

cord appropriate to your location.

• A bag containing rackmount screws and washers, plus five 75Ω BNC

terminators.

• Warranty information. Fill out the warranty card and return to Dolby

Laboratories. To receive software upgrades, register your product on the

software upgrades page at

www.dolby.com/download/softreg.

2.2 Installing

Installing Model 585 requires:

• Two standard rackspace units.

• Digital I/O. The digital input and output connections on Model 585 may be

unfamiliar to a first-time user of a digital audio device. The Audio

Engineering Society (AES) created a standard electrical interface for digital

audio with a balanced XLR connector and 110

Ω impedance called AES3-

1995. This interface was later expanded to include an unbalanced BNC

connector, 1 Vp–p signal level, and 75

Ω impedance; it is now known as both

AES3-ID-1995 and SMPTE-276M. Model 585 uses this new standard for

digital audio electrical interface connections.

Note: These signals must be properly terminated with a 75Ω impedance at one point

only. We recommend a standard video terminator.

Model 585 Time Scaling Processor Getting Started

2-2

• Cables. We recommend standard 75Ω BNC cables for digital audio signal

connections. To connect to digital equipment with 110

Ω XLR connectors, use

impedance-matching transformers (readily available from Canare, Neutrik,

and other manufacturers).

• Input channel 1/2 must be connected to a valid digital audio signal for proper

operation of the unit.

Model 585 can be used between any two products that carry PCM audio. For specific

installation examples, see Chapter 5, Applications.

2.3 Rear Panel

The main fuse rating is:

T 1A L (1 amp, 250 V, 20 mm, time-lag, low-breaking capacity) for all operating

voltages.

WARNING: Before applying power, check the main fuse, using the procedure

on page viii.

There is no power switch on Model 585. To apply power, connect the power cord to a

live outlet.

2.3.1 Digital Audio Connections

Figure 2-1 shows the digital audio input and output connections.

Ch 7/8Ch 7/8

AES RefAES Ref

Ch 7/8Ch 7/8

Ch 5/6Ch 5/6

Ch 1/2Ch 1/2

Ch 1/2Ch 1/2 Ch 3/4Ch 3/4

Ch 3/4Ch 3/4

Digital

Inputs

Digital

Inputs

Digital

Outputs

Digital

Outputs

Figure 2-1 Connections: Signal In and Out

Model 585 Time Scaling Processor Getting Started

2-3

Figure 2-1 definitions:

Digital Inputs. Model 585 requires PCM audio input at a sample rate of

48 kHz ± 15%. Each input has two connectors; either connector can be used for

the input or as a loop-through for that channel pair. If the loop-through connection

is not being used, it must be fitted with a 75

Ω termination. The last device in the

loop-through signal chain must be terminated with 75

Ω.

Note: Ch 1/2 requires a valid PCM digital audio signal. That input is used to derive

the clocks for all input channels and is the reference clock for scaling.

2. AES Ref. Connect to an AES digital audio reference source. The second connector

can either be used as a loop-through or be terminated, as appropriate.

Note: AES Ref requires a valid AES digital audio signal. That input is used to derive the

clocks for all output channels and so is the reference clock for the digital outputs.

3. Digital Outputs. These connections carry the processed PCM signal.

2.3.2 Serial Connection Ports

Figure 2-2 shows the serial connection ports.

Metadata OutMetadata Out

GP I/O

Remote RS-232

Metadata InMetadata In

Figure 2-2 Connections: Remote RS-232, GP I/O, Metadata In and Out

Figure 2-2 definitions:

Remote RS-232. Connect to this port to update Model 585 software.

Metadata In. (Reserved for future use.) Input port for external metadata. Connect

to a device that delivers Dolby

metadata, such as a Dolby E decoder or Model

DP570 Multichannel Audio Tool.

GP I/O. This port provides a fixed, TTL level-sensitive output indicating the

current status of Model 585.

Metadata Out. (Reserved for future use.) Output port for metadata. Connect to a

downstream Dolby E or Dolby Digital encoder.

Model 585 Time Scaling Processor Getting Started

2-4

2.3.3 Remote Connection Ports

The Remote (9-pin) In and Remote (9-pin) Out ports are reserved for future

enhancements.

2.4 Front Panel

The front panel is shown with feature definitions in Figure 2-3.

Menu display shows the current function mode

Knob

or adjustment o

settings and menu navigation

Buttons for

function selection, and adjustment of settings

menu navigation,

LEDs indicate when

specific modes are in use

Figure 2-3 Model 585 Front Panel

The menu system has two independent structures: setup and status. The setup menu

lets you control and configure Model 585 to suit your requirements. The status menu

displays information regarding the operating status.

There are two ways to adjust settings on Model 585. All functions are adjustable

using the buttons below the display window, and some functions can be easily

adjusted using the knob.

Model 585 Time Scaling Processor Getting Started

2-5

2.4.1 Reading the Display

After powering up, Model 585 displays the main status menu.

The factory default is:

5.1 + 2 Sens=5

+0.0

The main status menu shows you:

• On the upper line, the program configuration and the sensitivity level. In this

example,

5.1 + 2 defines two programs: Program 1, a 5.1 mix; and

Program 2, a two-channel mix. The sensitivity level is set to 5.

• The amount of pitch shifting on the lower line, +0.0%, indicates no shift.

2.4.2 Buttons

The six buttons in Figure 2-4 display window control navigation through the menus

and selection of parameters within menu screens. Press any button to use the

command listed below it.

Esc

Enter

Setup

Shift

Status Bypass

Figure 2-4 Front-Panel Buttons

Note: In the Transport menu, some buttons are redefined to trigger functions not

available in all other menus. For more details, see Section 3.1, Transport

Menu.

Model 585 Time Scaling Processor Getting Started

2-6

Table 2-1 Front-Panel Button Definitions

Button Result

Shift

Selects the alternate function for a button. To select Status or Bypass,

hold down

Shift and press the button under the selection you want.

Setup

From any status menu, displays the last setup menu viewed, or the

Unit

Setup

menu if a setup menu has not been viewed in the previous five

minutes. From any setup menu, displays the

Unit Setup menu.

Status

From any setup menu, displays the last status menu viewed, or the main

status menu if a status menu has not been viewed in the previous five

minutes. From any status menu, displays the main status menu (program

configuration and amount of pitch shift).

Scrolls to previous item in menu selection display. In menus that

determine a numeric value, increases that value.

Scrolls to next item in menu selection display. In menus that determine a

numeric value, decreases that value.

Enter

Activates the menu or setting on the lower line of the display.

Esc

Reverts to the next-higher menu level, or if the active setting is different

from the setting on screen, returns the display to the active setting.

Bypass

Activates bypass mode. Processing latency remains in effect, but no

adjustments are made to the output signal.

To take the unit out of bypass mode, press

Shift + Bypass again.

Note: In all menus, settings other than the active one display a flashing block next to

the setting. Press Enter to select the setting shown, or Esc to return to the

active setting.

2.4.3 Knob

The knob offers quick adjustment of many menu options.

Rotating clockwise scrolls through setup menu options in the same way as pressing

. Rotating counterclockwise scrolls through setup menu options in the same way

as pressing

In the main status menu, you can adjust the pitch shift value by turning the knob.

Pressing

Shift while turning the knob changes the sensitivity level. Pressing either

arrow button scrolls to other status menu displays.

Model 585 Time Scaling Processor Getting Started

2-7

Caution: Adjusting the pitch shift value or sensitivity level in the main status menu

activates that value change immediately; pressing Enter is not required.

You do not have the option to press Esc to return to the original setting, so

note what that setting is before rotating the knob.

In the Play menu, the knob triggers different functions than in all other menus. See

Knob Function in Play Menu on page 3-4 for details.

2.5 Status Menu

The main status menu, showing the current program configuration and pitch shift

percentage, appears when you turn the power on. At power-up, the status returns to

the configuration that was active at the preceding power-down.

When you press the

Status button combination (Shift + Status) while in a setup menu,

the display returns to the last status menu displayed within the previous five minutes.

If that is not the main status menu, you can view that menu by pressing

Esc, or the

Status button combination again.

In the main status menu, you can view more information about the current settings by

using the arrow buttons. Press

to view the next choice, or to view the

previous choice. Table 2-2 defines all the status menus.

Table 2-2 Status Menu Screens

Menu Definition

Main Status Shows program configuration and pitch shifting value.

Firmware Version

Shows version number of firmware loaded on Model 585.

Digital In

Enter to see status of the input signal for each channel pair.

Reference In

Shows status of the AES Reference signal.

Note: There is no indication of the condition of the reference or digital input signals

on the front panel or the main status menu. The status of these signals is only

available through the individual status menus.

Model 585 Time Scaling Processor Getting Started

2-8

2.6 Setup Menu

Options in the setup menu are:

• Program Config

• Operating Mode

• Transport

• System Settings

Press Enter to view the menu for the option on the second line of the display. The

Transport menu operates the time scaling function, and is described in Section

3.1, Transport Menu. The other three menus are described in this section.

2.6.1 Program Configuration

The Program Config menu initially displays the active program configuration.

Rotate the knob or press an arrow button to scroll through the other configuration

options. To process the input signal properly, the

Program Config setting must

match the configuration of the input signal.

The

Program Config setting describes how the eight input channels are

configured. The notation conventions are as follows:

The

+ symbol separates individual audio programs within a configuration. For

example,

5.1 + 2 represents one 5.1-channel and one stereo program—which may

or may not be related. The

× symbol shows the number of a given channel format

within that configuration. For example,

4 × 2 represents four two-channel

programs—again, which may or may not be related. One configuration has four

different programs:

4 + 2 + 2 × 1, which is one four-channel, one two-channel,

and two mono programs.

The

Program Config parameter instructs Model 585 which input channels to

process together as a single, phase-coherent program. For example:

5.1 Processes the first six input channels as one complete 5.1-channel audio

program.

5.1 + 2 Processes the first six input channels as one complete 5.1-channel audio

program. Processes channels 7 and 8 as one complete stereo program.

4 × 2 Processes channel pairs 1/2, 3/4, 5/6, and 7/8 as four separate stereo

programs.

Model 585 processes all program configurations to the same high quality. Therefore,

there is no difference in audio performance between

2 + 2, 3 × 2, or 4 × 2

program configurations.

Model 585 Time Scaling Processor Getting Started

2-9

Channel assignments within each program configuration follow standard mapping, as

shown in Table 7-1 in Chapter 7, Reference Data. The only exception is the low-

frequency effects (LFE) channel, which can also be assigned manually, as described

in Section 2.6.2, Operating Mode.

2.6.2 Operating Mode

In the Operating Mode menu, you have six options: Sensitivity, Pitch,

Processing Delay, Clock Source, DC Filter, and LFE Channel.

Sensitivity

Model 585 is able to perform high-quality time scaling of complex audio material

because, in a manner comparable to that used by human listeners, it analyzes and

identifies the individual audio components and processes them independently. The

Sensitivity setting allows you to adjust the level of processing detail Model 585

applies to the audio material. The default setting, 5–high, provides the most detailed

processing and is appropriate for nearly all material.

For some material, however, the 5–high setting may be too sensitive, causing

Model 585 to focus on subtle audio elements that can interfere with the processing of

the most prominent material. In this case, Model 585 may not produce its best results.

For example, if material with a live audience is being processed and the

Sensitivity setting is too high, Model 585 may focus on elements of audience or

ambient sounds to the detriment of the primary audio material.

As you decrease the Sensitivity setting, less prominent elements of the audio

material are processed less intensively, reducing the impact on the most prominent

elements. If the Sensitivity setting is too low, however, important elements of

the audio may not be processed correctly.

The Sensitivity setting can be adjusted in real time using the front-panel

controls.

If you alter the setting using the Sensitivity submenu, you are able to “cue up”

different settings. For example, you can be processing audio at one setting, select a

new setting and then press enter to activate the new setting as required.

In addition to adjusting this setting directly within the Sensitivity submenu, you

can also make the adjustment from the main status menu by rotating the knob while

pressing Shift. If you do so, however, the adjustment is immediately activated, and

you cannot return to the previous value by pressing Esc.

Model 585 Time Scaling Processor Getting Started

2-10

Note: Sensitivity should remain at 5–high for most program material. If the

setting must be changed, the change should be limited to the length of the

specific passage that requires the change, and then returned to 5–high.

Setting changes activate in real time when changed using the front-panel

controls.

Pitch

You can use the Pitch menu to select a new scaling value by pressing the arrow

buttons or rotating the knob. You can also make this adjustment from the main status

menu by rotating the knob. If you do so, however, the adjustment is immediately

activated, and you cannot return to the previous value by pressing Esc.

Processing Delay

The Processing Delay menu defines the system latency in milliseconds, within

a range of 400–480 ms. The default is 440 ms.

Clock Source

In the Clock Source menu, you can choose the source for the digital audio output

clock. The default is Digital Input, which locks the output clock to the channel

1/2 input. Internal 48 kHz locks the output clock to an internal 48 kHz

oscillator. External Ref-In locks the output clock to the AES Ref input clock.

The status of the AES Ref input clock is displayed in the Reference In status

menu.

DC Filter

The DC Filter can be turned on to eliminate any inconsistency due to the

processing of very low frequency or subsonic sounds. The default is Disabled.

LFE Channel

In the LFE Channel menu, you can adjust the assignment of the LFE channel to

match the input. The factory default is Auto, which assigns all channels according to

the standard channel mapping shown in Table 7-1. If the input to Model 585 includes

a program with an LFE channel assignment not in line with the assignments in Table

7-1, you need to assign the LFE channel manually using this menu. In multichannel

audio, the LFE channel is bandwidth-limited, so to process the complete program

audio properly, the LFE channel must be assigned correctly.

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Dolby Laboratories 585 Manuale utente

Marca: Dolby Laboratories

Modello: 585

Tipo: Manuale utente

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