2006-09-24 07:21:49 · 7 answers · asked by Anonymous in Consumer Electronics ➔ Home Theater
While there are exceptions, surround sound generally implies separate amplified signals from more than 2 channels/speakers (Most commonly, so called 5.1 or 6.1 sound ... where the first number refers to the number of "normal" speakers and the latter to a subwoofer (bass only). For example, a 5.1 system requires 4 speakers for the right and left front and surround channels plus a front centre channel speaker and a subwoofer).
Dolby Surround includes all flavours of Dolby surround processing (where Dolby refers to a number of standards for how sound is processed/decoded), and is therefore a general term. See the link provided by an earlier respondent for Dolby Labs for details.
Dolby Digital is a term for a specific standard form of digital (vs analogue) sound processing and may or may not mean surround processing. For example, there is Dolby Digital stereo, and various surround (multiple channel) formats. The number of channels is encoded in the original program material.
Dolby Surround can also be achieved by matrix processing of a stereo signal. One of the oldest standards is Dolby ProLogic.
While Doby is one of the most common standards for sound processing, others, such as Digital Theatre Sound (DTS) are also common. DVD players generally have built in Dolby Digital and DTS decoders, and A/V Receivers usually include more, plus a number of preset sound processing "standards" to "shape" the decoded sound (e.g. adjust reverberation and enhance or depress high or low frequencies) further to, for example, sound like a church, hall or jazz club.
2006-09-24 08:27:25 · answer #1 · answered by agb90spruce 7 · 1⤊ 1⤋
Dolby Pro-Logic is basically analog surround; added channels are added into the two standard stereo channels to generate surround. Dolby Digital is a combination audio compression and surround system, with the surround channels and effects channel (the.1) separately encoded into a digital bitstream. All are Dolby surround.
2006-09-24 13:08:06 · answer #2 · answered by gp4rts 7 · 0⤊ 0⤋
Dolby Digital is an advanced form of digital audio coding that makes it possible to store and transmit high-quality digital sound far more efficiently than was previously possible.
Dolby Pro Logic is the domestic equivalent. It takes the four channels of surround sound (left, centre front, right and a mono surround channel) from a VHS tape or television broadcast, properly processes the sound and reproduces that sound in your home.The mono rear channel (shared between two speakers to reduce rear "localisation" create an ambient effect) is bandwidth limited. Frequencies below 100Hz (in the bass) and above 7kHz (in the treble) were taken out of the rear channel speaker feed.
One of the main reasons for the success of Pro Logic is that all of the surround sound information was encoded (or matrixed) within a normal two-channel (stereo) soundtrack.
2006-09-24 07:29:35 · answer #3 · answered by ★HigHTƹcH★ 7 · 0⤊ 0⤋
In cinemas, Dolby Digital (5.1 and EX7.1) and Dolby Surround are more commonly used.
2006-09-24 07:48:19 · answer #4 · answered by Matt_c 1 · 0⤊ 1⤋
digital gives u a nice picture which is mostly like HD , dolby surround is the sound system which has an incredible sound which the surrounds you from different angeles and i think pro logic has both in it and i think it's expensive
2006-09-24 07:24:37 · answer #5 · answered by hellhammer 4 · 0⤊ 2⤋
im assuming ur setting up a system?
go with dolby digital 5.1 / dts
all the DD 7.1, etc is lame, nothign supports it
go with 5.1
2006-09-24 08:26:43 · answer #6 · answered by Franklin G 2 · 0⤊ 0⤋
YES. Check out, http://www.dolby.com/ for help.
2006-09-24 07:30:55 · answer #7 · answered by ? 4 · 0⤊ 1⤋