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WORKING OF AMPLIFIERSWORKING OF SPEAKERSMOTIONAL FEEDBACK AMPLIFIERMulti- channel Audio. Multi- channel audio systems are widely used in modern sound devices. The term “multi- channel audio” means that, the audio system can be capable of handling multiple audio channels (usually called audio tracks) to rebuild the sound on a multi- speaker setup. Usually two digits separated by a decimal (.) point (2. Some audio systems only have a single channel (called monophonic sound or single channel audio) or two channels (stereophonic sound or 2. The first digit shows the number of primary channels (called satellite units), each of which are reproduced on a single speaker (these speakers are capable for handling the frequency range from 1. Hz to 2. 2Khz), while the second (decimal digit) refers to the presence of LFE (Low Frequency Effect), which is reproduced on a subwoofer. Image Source. Surround Sound System. Surround sound is a term used to describe a type of audio output in which the sound appears to “surround the listener” by 3. Surround sound is a way to provide a more realistic and engaging experience. This is programmed into the source and the sound tracks are decoded when the source is played. The Surround Sound Setup. The main component of a surround sound setup is a multi channel or digital coaxial/optical audio decoder. Using a DVD/HVD movie, the audio is encoded when the DVD/HVD is produced by packing multiple audio channels into a compressed format for storage. Dolby Pro Logic II or DTS for example). Decoding capabilities of an A/V receiver are built in. Most A/V receivers today can decode Dolby Digital and Digital Theater Sound (DTS) (DTS channel usually a coaxial or optical audio channel. It is a single channel digital pin that multiplexed with several channel. The decoder decodes the DTS sound from single channel to multiple channels), while higher- end receivers may also include DTS- ES or THX Surround. Multi- channel Surround Sound Systems. Surround Sound Systems. Surround sound systems are one of the widely used surround sound setup in home theater systems. Usually- Dolby Digital and DTS encoded in a DVD are 5. These five channels are the minimum required to produce 5. The dot decimal (. LFE (low frequency effects), which is usually sent to a subwoofer. Other 5 units are capable for handling the frequency range except low frequency(Usually they are capable of handling the frequency range from 1. Hz to 2. 2Khz and no need for any other higher frequency component like tweeter). These five units are usually called satellite units. The arrangements of a 5. Surround Sound Systems. D realistic surround sound effect. THX Surround EX, Dolby digital ES and DTS- ES. The 6. 1 channel surround sound setup is shown in the picture. Image From. 7. 1 Surround Sound Systems. In this system splits the single rear- center speaker into individual left- and right- rear surround. These systems are not a true discrete 7. In a true discrete 6. SL) and surround right (SR) positions. A 7. 1 channel system uses matrixes extended surround where the left- back and right- back (rear- center surround) multichannel are blended together and stored. The structure of a 7. Picture below. Image. Surround Sound Systems. Developed by THX corporation, the name itself, 1. In a 1. 0. 2 surround sound 1. This includes five front speakers, five surround channels, two LFE and two heights, plus the addition of a second sub- woofer. This technology is considered as future TRUEHD. The Diagram of a 1. True. HD setup is shown below. Figure From. So far we talked about latest sound systems and the technologies behind. Often this type of technology is found in high end sound bar home theater speakers. Now lets take a look at surround sound formats. Common Surround Sound Formats. Dolby surround is the consumer version of Dolby analog film decoding. This technology was introduced in 1. This audio format is commonly found in VHS and stereo hi- fi systems. In this surround format, the multichannel audio multiplexed into two audio channels (left and right channels)and decoded by using Dolby pro logic decoder ,then it recreates the four channel Dolby surround experience. Dolby digital is the standard surround sound format which provides high quality and highly realistic experience. This audio is developed by Dolby Corporation. Dolby digital audio is also known as Audio Codec- 3(AC3). This audio format provides a high quality 5. Normally this audio format used for the creation of DVD and Blue ray movies. Some video games and play station units are also available in this surround sound format. Dolby Digital EX is the modified version of Dolby digital audio. This extended format contains an additional surround sound unit (called center surround channel) for creation of more realistic experience. Dolby digital EX needs Dolby EX decoder. This surround effect also support 5. This audio format usually available on DVD, HVD, blue ray, play stations, DTV broadcasts, etc . Dolby Pro Logic IIx is an advanced version of Dolby Digital EX technology. By using this technology, we can expand the 5. Dolby surround system into 6. The Dolby digital prologic usually use three modes for listening (movie, music and game modes). This surround technology provide more rich and depth surround sound effect than conventional surround sound system. This audio is normally encoded in DVD, HVD, BRD HDTV, play stations, etc. Dolby True HD surround sound is an advanced version surround sound that provides incredible High Definition experience to the listener. This surround sound format is also known as next generation surround sound format. Dolby True HD format only support HD based media and this technology provides 1. Mbps and support 8. Khz audio. This format also supports HDMI. Normally BRD and HVD are used for encoding this true surround. DTS is another digital surround format developed by DTS Corporation. It is a Multichannel digital surround format widely used in both consumer and commercial applications. The DTS audio system must have a DTS decoder and optical/coaxial digital decoder for decoding this surround. DTS is normally available in a single channel multiplexed format (2. DTS format is also available on DVD,HVD and BRD’s. DTS- ES (digital theater sound –Extended Surround) is an advanced version of normal DTS. This surround system is usually available in 6. This provides us with more true digital experience than conventional DTS system. This unit also requires an additional DTS- ES decoder for the creation of a back- surround effect. The system is compatible with all current extended surround formats and an auxiliary surround channel is also provided for other applications. Tru. Surround XT is the next generation of SRS Tru. Surround. The main advantage of this surround system is that it’s capable of handling 2. Audio is encoded in multiplexed format. This audio usually encoded in BRD’s and HVD’s.
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