Surround SoundSurround SoundPresented by:-Presented by:-

What Is Surround Sound?What Is Surround Sound? Refers to the use of multiple audio Refers to the use of multiple audio

tracks to envelop the movie tracks to envelop the movie watching or music listening watching or music listening audience.audience.

And making them feel like they're in And making them feel like they're in the middle of the action or a concert.the middle of the action or a concert.

The surround sound allows the The surround sound allows the audience to hear sounds coming from audience to hear sounds coming from all around them.all around them.

"Suspended disbelief" is when the "Suspended disbelief" is when the audience is completely captivated by audience is completely captivated by the movie experience and is no longer the movie experience and is no longer aware of their real-world aware of their real-world surroundings. surroundings.

There is one center speaker which There is one center speaker which carries most of the dialogue and part carries most of the dialogue and part of the soundtrack. of the soundtrack. 

There are left and right front There are left and right front speakers that carry most of the speakers that carry most of the soundtrack and may carry parts of soundtrack and may carry parts of the dialogue the dialogue

There is a pair of surround sound There is a pair of surround sound speakers that is placed to the side (and speakers that is placed to the side (and slightly above) of the audience to provide slightly above) of the audience to provide the surround sound and ambient effects.  the surround sound and ambient effects. 

Finally, a subwoofer can be used to Finally, a subwoofer can be used to reproduce the low and very low reproduce the low and very low frequency effects (LFE) that come with frequency effects (LFE) that come with certain movies certain movies

Surround sound technology Surround sound technology is used inis used in

Cinema and home Cinema and home theater systemstheater systems

Video game Video game consolesconsoles

Personal computersPersonal computers

MonoauralMonoaural The simplest method, and the one The simplest method, and the one

used in the earliest sound movies, is used in the earliest sound movies, is called called monauralmonaural or simply or simply monomono..

Mono means that all the sound is Mono means that all the sound is recorded onto one recorded onto one audio trackaudio track or or channelchannel

StereophonicStereophonic Two-channel recordings, in which Two-channel recordings, in which

sound is played on speakers on sound is played on speakers on either side of the listener, are often either side of the listener, are often referred to as referred to as stereostereo. .

Early SurroundEarly Surround The first use of The first use of

surround sound was in surround sound was in 1940, for the Disney 1940, for the Disney studio's animated film studio's animated film FantasiaFantasia. .

The sound was The sound was diffused throughout diffused throughout the cinema, initially by the cinema, initially by an engineer using an engineer using some 54 loudspeakers. some 54 loudspeakers.

Creating surround soundCreating surround sound

The first and simplest method is using a The first and simplest method is using a surround sound recording microphone surround sound recording microphone techniquetechnique

A second approach is processing the audio A second approach is processing the audio with psychoacoustic sound localization with psychoacoustic sound localization methodsmethods

A third approach, based on Huygens' A third approach, based on Huygens' principle,principle,

Monophonic SoundMonophonic Sound Monophonic sound is a single-Monophonic sound is a single-

channel, unidirectional type of sound channel, unidirectional type of sound reproduction.reproduction.

To the ear, all the elements of the To the ear, all the elements of the sound, voice, instruments, effects, sound, voice, instruments, effects, etc... appear to originate from the etc... appear to originate from the same point in space. same point in space.

Stereophonic SoundStereophonic Sound Stereophonic Sound is a more open Stereophonic Sound is a more open

type of sound reproduction type of sound reproduction

Although not totally realistic, Although not totally realistic, stereophonic sound lets the listener stereophonic sound lets the listener experience the correct sound experience the correct sound staging of the performance.staging of the performance.

The Stereophonic The Stereophonic Process Process

The main aspect of The main aspect of Stereophonic sound is Stereophonic sound is the division of sounds the division of sounds across two channels.across two channels.

The recorded sounds The recorded sounds are mixed in such a are mixed in such a way that some way that some elements are elements are channeled to the left channeled to the left part of the part of the soundstage; others to soundstage; others to the right. the right.

Limitations Of Stereo Limitations Of Stereo Sound Sound

Some recordings resulted in a "ping-Some recordings resulted in a "ping-pong" effect.pong" effect.

Also, even though the sound was Also, even though the sound was more realistic, the lack of ambience more realistic, the lack of ambience information, such as acoustics or information, such as acoustics or other elements, left Stereophonic other elements, left Stereophonic sound with a "wall effect" sound with a "wall effect"

Surround sound Surround sound specificationsspecifications

3.0 Channel 3.0 Channel SurroundSurround

Extracts 3 audio Extracts 3 audio channels :- channels :-

Two channels for Two channels for speakers at the speakers at the front—left (L) and right front—left (L) and right (R). (R).

One channel for surround One channel for surround speaker or speakers at the speaker or speakers at the rear—surround (S). rear—surround (S).

4.0 Channel 4.0 Channel SurroundSurround (analog (analog matrixed/discrete: matrixed/discrete: Quadraphonic)Quadraphonic)

Extracts four Extracts four audio channels :-audio channels :-

Two channels for Two channels for speakers at the front—left speakers at the front—left (L) and right (R). (L) and right (R).

Two channels for Two channels for surround speakers at the surround speakers at the rear—surround left (LS) rear—surround left (LS) and surround right (RS). and surround right (RS).

4.0 Channel 4.0 Channel SurroundSurround (analog (analog matrixed: Dolby Pro matrixed: Dolby Pro Logic)Logic)

Extracts four audio Extracts four audio channels :-channels :-

Two channels for speakers at Two channels for speakers at the front—left (L) and right the front—left (L) and right (R). (R).

One channel for speaker at One channel for speaker at the center—center (C). the center—center (C).

One channel for both One channel for both surround speakers at the rearsurround speakers at the rear—mono surround channel (S).—mono surround channel (S).

5.1 Channel 5.1 Channel SurroundSurround (3-2 (3-2 Stereo) (analog Stereo) (analog matrixed: Dolby Pro matrixed: Dolby Pro Logic II)Logic II)

Extracts Five Extracts Five audio channels :-audio channels :-

Two channels for speakers at Two channels for speakers at the front—left (L) and right (R). the front—left (L) and right (R).

One channel for speaker at One channel for speaker at the center—center (C). the center—center (C).

Two channels for surround Two channels for surround speakers at the rear—surround speakers at the rear—surround left (LS) and surround right left (LS) and surround right (RS). (RS).

One low-frequency effects One low-frequency effects channel (LFE). channel (LFE).

6.1 Channel 6.1 Channel SurroundSurround (analog (analog matrixed: Dolby Pro matrixed: Dolby Pro Logic IIx)Logic IIx)

Extracts six audio Extracts six audio channels and one low-channels and one low-frequency channel :-frequency channel :-

Two channels for speakers at Two channels for speakers at the front—left (L) and right (R). the front—left (L) and right (R).

One channel for speaker at the One channel for speaker at the center—center (C). center—center (C).

Two channels for surround Two channels for surround speakers at the sides—side left speakers at the sides—side left (LS) and side right (RS). (LS) and side right (RS).

One channel for surround One channel for surround speakers at the rear—back speakers at the rear—back surround channel (BS). surround channel (BS).

7.1 Channel 7.1 Channel SurroundSurround (digital (digital discrete: Dolby Digital discrete: Dolby Digital Plus, DTS-HD, Dolby Plus, DTS-HD, Dolby TrueHD)TrueHD)

Delivers seven audio Delivers seven audio channels and one channels and one LFE channelLFE channel :- :-

Two channels for speakers at Two channels for speakers at the front—left (L) and right (R). the front—left (L) and right (R).

One channel for speaker at the One channel for speaker at the center—center (C). center—center (C).

Two channels for surround Two channels for surround speakers at the sides—left speakers at the sides—left surround (LS) and right surround (LS) and right surround (RS)surround (RS)

Two channels for surround Two channels for surround speakers at the rear—left back speakers at the rear—left back (LB) and right back (RB). (LB) and right back (RB).

Surround Sound FormatsSurround Sound Formats Dolby Pro LogicDolby Pro Logic

Dolby DigitalDolby Digital

DTSDTS

THX Surround EXTHX Surround EX

Dolby Pro LogicDolby Pro Logic It is the simplest, cheapest format. It is the simplest, cheapest format.

It has 4 channels that are It has 4 channels that are compressed into two analog compressed into two analog channels, so you can record it on channels, so you can record it on your stereo VCR and it can also your stereo VCR and it can also broadcasted even over analog radio broadcasted even over analog radio or cable TV. or cable TV.

Dolby Digital Dolby Digital It is a 6-channel format, referred to as It is a 6-channel format, referred to as

5.1-channel 5.1-channel Advantages over Dolby Pro Logic Advantages over Dolby Pro Logic

include the fact that all channels are include the fact that all channels are digital, discrete and 5 of them are full-digital, discrete and 5 of them are full-bandwidth. bandwidth.

Additionally, the surround speakers Additionally, the surround speakers use separate left and right channels use separate left and right channels (stereo). (stereo).

DTS DTS DTSDTS is also a 6-channel format (5.1- is also a 6-channel format (5.1-

channel). channel).

The main difference from Dolby Digital The main difference from Dolby Digital is that DTS uses less compression thus is that DTS uses less compression thus providing marginally better sound providing marginally better sound

DTS is less widespread than Dolby DTS is less widespread than Dolby Digital. Digital.

THX Surround EX THX Surround EX THX Surround EXTHX Surround EX takes the Dolby takes the Dolby

Digital signal and creates another Digital signal and creates another additional matrixed channel, which additional matrixed channel, which is then sent to one or two surround is then sent to one or two surround speakers, thus giving a 6.1 or 7.1 speakers, thus giving a 6.1 or 7.1 sound. sound.

Dolby Surround Basics Dolby Surround Basics The Dolby Surround process involves The Dolby Surround process involves

encoding four channels of encoding four channels of information--Front Left, Center, Front information--Front Left, Center, Front Right, and Rear Surround into a two Right, and Rear Surround into a two channel signal channel signal

A decoding chip then decodes the A decoding chip then decodes the four channels and sends them to the four channels and sends them to the appropriate destination, the Left, appropriate destination, the Left, Right, Rear, and Phantom Center Right, Rear, and Phantom Center

The Limitation Of Dolby The Limitation Of Dolby Surround Surround

With the rear channel being With the rear channel being basically passive, it lacks precise basically passive, it lacks precise directionality. directionality.

Also, overall separation between Also, overall separation between channels is much less than a typical channels is much less than a typical Stereophonic recording. Stereophonic recording.

SDDSSDDS The latest entry in cinema digital The latest entry in cinema digital

sound, Sony Dynamic Digital Sound® sound, Sony Dynamic Digital Sound® (SDDS)(SDDS)

It boasts five separate channels at the It boasts five separate channels at the front of the theater as well as left and front of the theater as well as left and right surround channels, for a total of right surround channels, for a total of eight available channels including the eight available channels including the subwoofer. subwoofer.

Conclusion - For Now...Conclusion - For Now... Today's surround sound experience Today's surround sound experience

is the result of decades of evolution. is the result of decades of evolution. The surround sound experience is The surround sound experience is now easily accessible, practical, and now easily accessible, practical, and affordable for the consumer. Go get affordable for the consumer. Go get surrounded!!!!!!!!!!!!surrounded!!!!!!!!!!!!

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