Clarification On Dolby Pro-Logic vs Dolby Digital
Jul 27 '00 (Updated Jul 28 '00)
I just finished reading a review that recommends to turn the “Pro-Logic” on when using Dolby Digital 5.1. Dolby Pro-Logic and Dolby Digital 5.1 are two different surround sound systems and cannot be used together.
This review is named "CRISP and IN-DEPTH!"!
Every time when I see the review, which contains some kind of nonsense and is still rated HR, I become unhappy and feel that I have to write a review to explain the real situation.
Only upon completion of this mission can I feel happy again.
DOLBY PRO-LOGIC
Dolby Pro-Logic is analog system that appeared in consumer products in the fall of 1987. It takes the two-channel analog signal and separates it into 4 channels (and adds delay to the rear channels; the amount of delay sometimes can be adjusted):
1. Center Channel
2. Left Channel
3. Right Channel
4. Rear Channel (the same signal is directed to 2 rear speakers)
Your DVD player extracts digital sound for left and right channels, converts it to analog signals and sends it to your Dolby Pro-Logic sound system, that in turn extracts the center channel and rear channel sound from them.
I currently use Dolby Pro-Logic Sharp CD-C3800 sound system with my Sharp DV600U DVD player and find this combination not perfect, but suitable. It provides good (not excellent, just good) sound.
DOLBY DIGITAL 5.1
In Dolby Digital 5.1 the digital signals for 6 channels are transferred from DVD player to the Dolby Digital Decoder through either coaxial or optical input:
1. Left Channel
2. Right Channel
3. Center Channel
4. Left Rear Channel
5. Right Rear Channel
6. Subwoofer
I become sad when members write reviews about something they don’t understand.
And the worst part is: since I am currently "invisible" to non-members, they will not be able to read this.
MORE INFO ON DOLBY PRO-LOGIC
The Dolby Pro Logic Surround system appeared in consumer products in the fall of 1987, quickly gaining popularity with home theatre enthusiasts. The systems expensive; the decoder circuitry was complex, in effect limiting Pro Logic technology to high-end A/V products.
One year later, in 1988, came the breakthrough needed to make Pro Logic decoding economically attractive: a custom integrated circuit was developed, consolidating a significant number of processing circuits into one package. Since that time several more analog and digital integrated circuits have become available, providing high performance multi-channel sound in a wide range of cost-effective home systems.
Dolby Surround video and television programs are made using a Dolby MP (Motion Picture) Matrix encoder, which encodes four channels of audio into a standard two-channel format, that can be recorded and transmitted in the same manner as regular stereo programs.
Additional information can be found at www.dolby.com
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Epinions.com ID:
dkozin
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Location: California
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I love to push buttons on electronic (audio and video) equipment. It makes me happy.
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