Crestron Surround Sound User Manual
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Crestron Surround Sound User Manual

Crestron Surround Sound User Manual

Crestron surround sound guides: user guide
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Crestron Surround Sound
Primer

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Summary of Contents for Crestron Surround Sound

  • Page 1 Crestron Surround Sound Primer...
  • Page 2 Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic”, “Pro Logic II”, “Dolby Digital”, “Dolby Digital 5.1, and the double-D symbol are trademarks of Dolby Laboratories. Manufactured under license from Digital Theater Systems, Inc. “DTS”, DTS Digital Surround Sound”’ “DTS-ES Extended Surround”, DTS Virtual 5.1”, “NEO:5”, and “NEO:6” are trademarks of Digital Theater Systems, Inc.

  • Page 3: Table Of Contents

    Interaural Intensity Difference ... 6 Pinna Filtering ... 7 The Precedence Effect... 7 Reverberation and Echoes ... 8 Temporal Masking ... 9 A History of Surround Sound ... 9 Early Surround ... 9 Quadraphonic ... 9 Dolby... 10 Dolby Pro Logic ... 11 Dolby Pro Logic II ...
  • Page 4 Primer Setup Procedures ... 21 What We Hear in a Room ... 22 Speakers Placed in Cabinets... 22 Stereo Imaging ... 23 About Surround Sound... 23 Subwoofer Placement... 24 Equalizers ... 25 Graphic Equalizer... 25 Parametric Audio Filters ... 25 Parametric GUI ...

  • Page 5: Crestron Surround Sound

    Wavelength can be measured by taking the horizontal distance from a point (at the peak in our example) of one wave cycle to the same point at the peak in the second wave cycle. Primer – DOC. 6122 Primer Surround Sound • 1...

  • Page 6: Volume (Amplitude)

    A-weighted and the more rigorous C-weighted scales, indicated as dBA or dBC, respectively. The term decibel is also used in various other measurements such as signal-to-noise ratio, gain and dynamic headroom. In these instances, 2 • Surround Sound Primer – DOC. 6122...

  • Page 7: Vu And Db

    The frequency resolution of the ear is, in the middle range, about 2 Hz. Changes in pitch larger than 2 Hz are noticeable. Even smaller pitch Primer – DOC. 6122 Primer Surround Sound • 3...

  • Page 8: Timbre

    (attack), for example, the moment a violinist puts the bow to the string. These are called onset transients and are important in identifying the sound and its location in space. 4 • Surround Sound Primer – DOC. 6122...

  • Page 9: Psychoacoustics

    Understanding psychoacoustics is essential to creating surround sound. Primer – DOC. 6122 Primer...

  • Page 10: Localization

    Interaural Time Difference Interaural Intensity Difference The head, shoulders and upper torso create a sound barrier at one ear or the other. This acoustical shadow called the Interaural Intensity Difference. 6 • Surround Sound Primer – DOC. 6122...

  • Page 11: Pinna Filtering

    Localization judgments are based on the first arriving sound waves at the beginning of a sound. This strategy is known as the precedence effect, because the Primer – DOC. 6122 Primer Surround Sound • 7...

  • Page 12: Reverberation And Echoes

    80 ms), which reinforce the direct sound (as long as the angle of reflection is not too wide). Reflections arriving after 80 ms add reverberant energy, which gives the sound spaciousness, warmth and 8 • Surround Sound Primer – DOC. 6122...

  • Page 13: Temporal Masking

    Early Surround Walt Disney's "Fantasia" (1941), was one of the first surround sound motion pictures. Four separate recordings of each orchestra section were recorded on a separate reel of film and played through speakers positioned around the theater.

  • Page 14: Dolby

    Dolby 4-2-4 Encoding The surround input is also divided equally between the left-total and right-total signals but first undergoes three processing steps: 10 • Surround Sound Crestron Surround Sound • It is frequency band-limited from 100 Hz to 7 kHz •...

  • Page 15: Dolby Pro Logic

    6. Signals that are identical and in-phase are applied to the center channel. 7. Signals that are identical but out of phase are applied to the rear surround speaker. Primer Surround Sound • 11...

  • Page 16: Dolby Pro Logic Ii

    Surround EX decoding which derives the extra surround channel for playback in 6.1 (three surround speakers) or 7.1 (four surround speakers) configurations. The additional rear speakers are matrixed and not discrete in nature. 12 • Surround Sound Primer – DOC. 6122...

  • Page 17: Dts

    DTS-ES DTS-ES is a digital matrix decoder developed by DTS for back channel 5.1 surround sound in theatres. It is comparable to Dolby Digital Surround EX soundtracks and is a competitor to the Dolby SA10 adapter, the proprietary back surround decoder for cinemas.

  • Page 18: Dts-Neo 6

    Primer DTS-Neo 6 The DTS-Neo 6 derives the surround sound channels from a technique of advanced sub-band processing by using algorithms. Stereo music material may be expanded from stereo to 5.1 or 6.1 surround channels. Users with 5.1 and 6.1 systems derive five and six separate channels, respectively, corresponding to the standard home-theater speaker layouts.

  • Page 19: Speakers

    Surround channel speakers are similar to bookshelf speakers. Surround speakers should have similar response characteristics to the other speakers in a surround sound system to present a uniform sound environment. This is also referred to as “timbre matching”. NOTE: When referring to loudspeakers, the term "Q" is a measure of directionality.

  • Page 20: Bass Management

    Primer Bass Management In a surround sound speaker system, the higher frequencies are distributed to the speakers around the room: Left, Center, Right, Left and Right Surround, and in a 7.1 system, Left and Right Rear Surround. The lower, or Bass frequencies for all of these channels can be directed through a Bass Management circuit, which outputs to a subwoofer.

  • Page 21: Standing Waves

    0 degrees to 180 degrees. By switching the phase, sound waves from the subwoofer can be aligned with other sound waves to reinforce one another instead of canceling each other out. Phase Shift Primer – DOC. 6122 Primer Surround Sound • 17...

  • Page 22: Surround Sound Speaker Placement

    Primer Surround Sound Speaker Placement Front Speaker Placement The front speakers are arrayed across the front of the viewing/listening area. These three speakers should be as equidistant as possible from the center listener position and on a plane with the listener's ears.

  • Page 23: Surround Speaker Placement Optimized For Movie Soundtracks

    Generally, audio component response specifications are given as a function of the frequency range. For example, a speaker can have a flat Primer – DOC. 6122 Primer Surround Sound • 19...

  • Page 24: Equalization

    Generally, an artificial increase of those frequencies can introduce undesirable distortion. NOTE: Equalizer adjustments should only be performed when the actual room response is known. 20 • Surround Sound Primer – DOC. 6122...

  • Page 25: Required Test Equipment

    Crestron Surround Sound Room Adjustments After completing the hardware hookup procedures, perform these procedures to set the surround sound default values according to the actual environment of the listening area. Required Test Equipment: The following equipment is recommended to optimize performance...

  • Page 26: What We Hear In A Room

    This vibration can transfer from the speaker to the cabinet, reducing the full sound capability of the speaker. Placing the speaker on mounting posts (that may be provided) or on a platform designed to reduce vibration transmission can help. 22 • Surround Sound Primer – DOC. 6122...

  • Page 27: Stereo Imaging

    If you have additional rears they should be placed on the back wall, positioned between the front right and left speakers and directed toward the front Primer – DOC. 6122 Primer Surround Sound • 23...

  • Page 28: Subwoofer Placement

    These are commonly placed in corners 24 • Surround Sound Primer – DOC. 6122...

  • Page 29: Equalizers

    (octave). When a signal is parametrically equalized, its amplitude is changed at a selected center frequency and over a selected range of frequencies on either side of the center. Primer – DOC. 6122 Primer Surround Sound • 25...
  • Page 30 A high-pass filter circuit passes all signals that have a frequency higher than the specified frequency, while attenuating all frequencies lower than its specified frequency. High Pass Filter 26 • Surround Sound Crestron Surround Sound • High Pass Filter •...
  • Page 31 Sometimes it is called a high-frequency discriminator or high-frequency attenuator. A low-pass filter passes all frequencies below the specified frequency, while attenuating all frequencies above this specified frequency. Low Pass Filter Primer – DOC. 6122 Primer Surround Sound • 27...
  • Page 32 The bass shelf filter can also be used to uniformly decrease the bass frequencies to eliminate a booming bass sound Bass Shelf Filter- Reducing Overall Bass Response 28 • Surround Sound Primer – DOC. 6122...
  • Page 33 Crestron Surround Sound Primer Bass Shelf Filter – Increasing Overall Bass Response Surround Sound • 29 Primer – DOC. 6122...
  • Page 34 The treble shelf filter can increase the proportion of treble to bass, enabling the smaller speakers to produce a clearer sound. Treble Shelf Filter – Increasing Overall Treble Response 30 • Surround Sound Primer – DOC. 6122...
  • Page 35 Crestron Surround Sound Primer Treble Shelf Filter – Decrease Overall Treble Response Surround Sound • 31 Primer – DOC. 6122...
  • Page 36 0.6. This affects adjacent frequencies from about 2 kHz to 8 kHz by gradually increasing the amplitude from 2 to 4 kHz and gradually decreasing the amplitude from 4 kHz to 8 kHz. 32 • Surround Sound Primer – DOC. 6122...
  • Page 37 A notch filter ideally suppresses a single frequency component (the notch frequency) within the input signal, or a narrow symmetric window around the notch frequency. Primer – DOC. 6122 Primer Surround Sound • 33...
  • Page 38 Primer Crestron Surround Sound Notch Filter 34 • Surround Sound Primer – DOC. 6122...

  • Page 39: Parametric Gui

    By shortening the octave range, fewer adjacent frequencies are affected. The area within the shaded portion of this diagram corresponds to the frequencies that are affected by this adjustment. Example: 4kHz Parametric Filter Primer – DOC. 6122 Primer Surround Sound • 35...
  • Page 40 Information courtesy of Dolby Laboratories, www.dolby.com/ht/Guide.HomeTheater Information courtesy of AudioVideo101.com Information courtesy of THX, Ltd, www.thx.com Information courtesy of Yanman, www.yanman.com/HomeTheater Information courtesy of Widescreen Review, http:// db.widescreenreview.com/surround/articles Information courtesy of DTS, www.dtsonline.com 36 • Surround Sound Crestron Surround Sound Primer – DOC. 6122...

  • Page 41: Glossary

    (THD) and is commonly used in audio test reports. However, different components generate different ratios of odd and even orders, making some sound better than others, even though their THD measurements might be the same. Surround Sound • 37 Primer...
  • Page 42 Four uses of masking involve Dolby AC-3 Digital Surround Sound, MPEG video, DCC cassettes, and the MiniDisc. Matrixing A technique in which additional signals can be conveyed by altering the phase relationships of the signals.
  • Page 43 Five point one is a term used to describe digital surround sound audio formats such as DTS and Dolby Digital. The five stands for five discrete channels of sound information. These channels are full range and fully digital - left front, front center, right front, right rear or surround, left rear or surround.

  • Page 44: Index

    Front Speaker Placement... 18 Glossary... 36 Graphic Equalizer... 25 Haas... 36 Harmonic Distortion... 36 High Pass... 27 History of Surround Sound... 9 Interaural Intensity Difference... 6 Interaural Time Difference ... 6 Large and Small... 16 LFE... 37 Localization ... 6 Lossless ...
  • Page 45 Crestron Surround Sound Primer This page intentionally left blank. Surround Sound • 41 Primer – DOC. 6122...
  • Page 46 Crestron Electronics, Inc. Operations Guide – DOC. 6122 15 Volvo Drive Rockleigh, NJ 07647 11.03 Tel: 888.CRESTRON Fax: 201.767.7576 Specifications subject to www.crestron.com change without notice.

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