The Evolution of Dolby
Dolby Stereo
In 1976, Dolby Stereo revolutionised the film industry by placing multi-channel stereo sound in movie theatres creating a more involving experience for the audience. In addition to left and right screen channels, theatres also use a centre channel to sharpen the perspective of on-screen sounds, plus a surround channel played over loudspeakers along the sides and rear of the auditorium to immerse the viewer in ambience and special effects. This technology was then extended to bring multi-channel soundtracks to viewers at home, and was called Dolby Surround.
Dolby Surround / Pro Logic
Dolby Surround is the consumer version of the original Dolby multi-channel analogue film sound format Dolby analogue. Dolby Surround or Dolby Pro Logic is based on basic matrix technology. When a Dolby Surround soundtrack is created, four channels of sound are matrix-encoded into an ordinary stereo two channel sound track by using phase shift techniques. A Pro Logic decoder/processor unfolds the sound into the Dolby 4.0 surround. This consists of left and right, center, and a single limited frequency-range mono rear channel which are matrix-encoded onto two audio tracks. These two tracks are then carried on stereo program sources such as videotapes and TV broadcasts into the home where they can be decoded by Dolby Pro Logic to recreate the original four-channel surround sound experience. A system with out this decoding method would play back the audio as standard Stereo.
Dolby Surround delivers four-channel surround sound via regular stereo VHS, TV and FM radio broadcasts, DVD discs, video games and CDs. Four channels (left, centre, right, and surround) are encoded into two-channel soundtracks and then recovered on playback by means of a Dolby Surround Pro Logic decoder. Dolby Surround is a two-step encode/decode process involving both recording and playback. When a Dolby Surround soundtrack is produced, four channels of audio information, left, centre,
In 1976, Dolby Stereo revolutionised the film industry by placing multi-channel stereo sound in movie theatres creating a more involving experience for the audience. In addition to left and right screen channels, theatres also use a centre channel to sharpen the perspective of on-screen sounds, plus a surround channel played over loudspeakers along the sides and rear of the auditorium to immerse the viewer in ambience and special effects. This technology was then extended to bring multi-channel soundtracks to viewers at home, and was called Dolby Surround.
Dolby Surround / Pro Logic
Dolby Surround is the consumer version of the original Dolby multi-channel analogue film sound format Dolby analogue. Dolby Surround or Dolby Pro Logic is based on basic matrix technology. When a Dolby Surround soundtrack is created, four channels of sound are matrix-encoded into an ordinary stereo two channel sound track by using phase shift techniques. A Pro Logic decoder/processor unfolds the sound into the Dolby 4.0 surround. This consists of left and right, center, and a single limited frequency-range mono rear channel which are matrix-encoded onto two audio tracks. These two tracks are then carried on stereo program sources such as videotapes and TV broadcasts into the home where they can be decoded by Dolby Pro Logic to recreate the original four-channel surround sound experience. A system with out this decoding method would play back the audio as standard Stereo.
Dolby Surround delivers four-channel surround sound via regular stereo VHS, TV and FM radio broadcasts, DVD discs, video games and CDs. Four channels (left, centre, right, and surround) are encoded into two-channel soundtracks and then recovered on playback by means of a Dolby Surround Pro Logic decoder. Dolby Surround is a two-step encode/decode process involving both recording and playback. When a Dolby Surround soundtrack is produced, four channels of audio information, left, centre,