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Dolby Laboratories 430 manual

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Table of contents for the manual

  • Page 1

    430 SERIES BACKGROUND NOISE SUPPRESSOR SYSTEM Installation and Operating Instructions MAIN[...]

  • Page 2

    INST ALLA TION AND OPERA TING INSTRUCTIONS FOR 430 SERIES BACKGROUND NOISE SUPPRESSOR SYSTEM Dolby Laboratories Incorporated U.S.A. 100 Potrero Avenue, San Francisco, CA 94103 Tel: 415-558-0200; Fax: 415-863-1373 U.K. Wootton Bassett, Wiltshire, SN4 8QJ, England Tel: 0793-842100; Fax: 0793-842101; Telex: 44849 WARRANTY INFORMATION: warranty on the [...]

  • Page 3

    DOLBY 430 DOLBY 430 D OLBY 430 B A CK GR OUND N OISE S UPRESSOR BACKGROUND NOISE SUPPRESSOR BACKGROUND NOISE SUPPRESSOR T he Dolby 430 Series is a backgr ound noise suppressor system for r educing the broadband noises such as wind or traffic rum- ble that often mar location recordings. Many mixers in film and television postpr oduction alread y rel[...]

  • Page 4

    Signal Processing Independent low - and high-frequency stages with maximum noise suppression of appro ximately 16 and 18 dB, respecti vely Signal Connection 3-pin XLR connectors for audio; 34-wa y ribbon connector links processing module fr ames to pow er supply/contr ol unit; one 15-wa y D-connector con- nects remote contr ols for all channels Ope[...]

  • Page 5

    i T ABLE OF CONTENTS INTRODUCTION SECTION 1 UNIT CONFIGURATIONS 1.1 The Model 430 System .................................................................................................. 1 -1 1.2 Accessories ................................................................................................................. ... 1 - 1 SECTION 2 OPERATI[...]

  • Page 6

    ii INTRODUCTION The Model 430 Series is a playback-only noise reduction system intended primarily to reduce unwanted ambient noise from location recordings. Typically, this noise is generated by broadband sources such as generators, wind, or traffic. The Model 430 Series is a second-generation design, following from the Cat. No. 43 unit — a succe[...]

  • Page 7

    1-1 SECTION 1 UNIT CONFIGURA TIONS 1.1 The Model 430 System The Model 430 is a modular system which has a control unit containing the power supply and microprocessor. The control unit links to one or more enclosures each of which contains one or two noise suppression modules and also links to one or more remote control modules. The 40mm wide format[...]

  • Page 8

    1-2 1.2 Accessories The figure below shows the various 430 Series accessories available. These items can be ordered to expand an existing system. A1F4356A Dolby 430 Series Remote Pod Bypass Normal Dolby Cat. No. 413 430 Series Noise Suppressor Module 430 Series Noise Suppressor Module Cat. No. 413 Dolby Normal Bypass Bypass Normal Dolby Cat. No. 41[...]

  • Page 9

    2-1 SECTION 2 OPERA TION 2.1 CONTROLS Operation of the Model 430 is very simple. The basic controls and indicators mounted on the Cat. No. 429 remote for each channel are described below. in HF LF Adjust Clip Pull to Level Remote Series 430 Dolby 4 3 2 1 0 5 1 2 3 4 1 In/Out Switch and Indicator This push-button switches all processing in and out s[...]

  • Page 10

    2-2 4 High-frequency and Low-frequency Suppression Controls The left-hand slider controls the amount of low level LF attenuation the unit applies; the right-hand slider controls the low level HF attenuation. When the controls are at the top there is no processing, and at the bottom there is maximum processing. The effect is gradual with about half [...]

  • Page 11

    2-3 It is usually better to locate the console channel fader after the Model 430 unit. Gain riding the Model 430 input can allow dialog to move into the expansion band resulting in unexpectedly increased dynamic range. Also, when the Model 430 is being used to reduce reverberation the process can change the perceived loudness of the track (even tho[...]

  • Page 12

    3-1 SECTION 3 INST ALLA TION 3.1 Control unit and Suppressor Frames The installation of Model 430 series consists of plugging together the component parts and rack mounting (prefereably) the control unit and each two-channel frame. Taking a typical system with three channels, the procedure is as follows: The system should be unpacked and inspected [...]

  • Page 13

    3-2 Similarly there is a slot in the back of each two-channel frame and the other connectors should be mated, (bump upwards) with these observing the warning about excessive force. The channel frames can be stacked with the control unit at the top or bottom. Next, the 15 meter shielded cable should be located and plugged into the 15-way D connector[...]

  • Page 14

    3-3 3.2 Console Mounting of Remotes. If optional Cat. No. 428 remote housings (holding up to three remote control units each) are not used, the remote controls can be placed in spare sections of the console. The size of each remote unit is 150 mm x 39 mm with a maximum projection behind the control surface of 100 mm. The shielded cable connecting t[...]

  • Page 15

    3-4 3.4 Panel Cut-Out Templates for Cat. No. 428 Remotes The templates below can be removed from this manual and used to cut/drill blank console panels. A1F4356C MAIN[...]

  • Page 16

    3-5 3.5 Regulatory Notices WARNING: Check that the unit has been set to the correct supply voltage and that the correct fuse is installed. To reduce the risk of fire, replace the fuse only with the same type and rating. For 100/120 Vac, use 1.25A/250 V 1/4" x 1-1/4" slow-blow fuse. For 220/240 Vac, use T630 mA/250 V 5 x 20mm time-lag fuse[...]

  • Page 17

    3-6 GB F D I IMPORT ANT SAFETY NOTICE This unit complies with the safety standard IEC65. T o ensure safe operation and to guard against potential shock hazard or risk of fire, the following must be observed: • Ensure the voltage selector is set to the correct mains voltage for your supply . • Ensure fuses fitted are the correct rating and type [...]

  • Page 18

    4-1 SECTION 4 THEOR Y OF OPERA TION Based on the Dolby SR spectral recording system, the Model 430 series design incorporates two separate noise reducing bands; one for low and the other for high frequencies. Unlike SR, however, the degree to which the signal is treated can be controlled by two slider controls and the level at which the expanders w[...]

  • Page 19

    4-2 In situations where the interference is broadband, both the LF and HF bands can be used in varying amounts. The two expander sections are in series therefore their effects tend to sum. For this reason, it will be found that the amount of processing used can often be reduced when both bands are brought into play since they broadly overlap in the[...]

  • Page 20

    5-1 SECTION 5 SCHEM A TIC DIAGRAMS- Contact Dolby Laboratories Figure 5-1 Power Supply ......................................................................................................... ................ 5 -2 Figure 5-2 Control Circuit ...................................................................................................... .....[...]

  • Page 21

    A-1 APPENDIX A 1 Plugging Precautions Any Cat. No. 413 suppressor module can be removed and replaced with the power applied. However it will only take on the settings determined by its remote contol unit after every control on the remote has been exercised. Similarly, the remote controls can be plugged and unplugged with the power on although it ha[...]