Phase Shifting

[typhon]

in this diagram, it shows that the rear speaker is phase reversed. is this just for the one speaker that is marked, or both of the rear speakers? what purpose does this serve. i was under the impression that running speakers out of phase was a bad thing. is that just old school thinking?

[Nick_USA]

in this diagram, it shows that the rear speaker is phase reversed. is this just for the one speaker that is marked, or both of the rear speakers? what purpose does this serve. i was under the impression that running speakers out of phase was a bad thing. is that just old school thinking?

OK you did ask.....

A dynamic decorrelator for surround sound signals is disclosed. In one embodiment, a mono detection circuit is used to detect the extent to which a left rear surround input signal and a right rear surround input signal are similar. To the extent that the surround input signals are similar, the signals are decorrelated. Decorrelation is performed by a pair of allpass filters that introduce complementary phase shifts in the left rear surround input signal and the right rear surround input signal. The complementary phase shifts are sufficient to prevent the surround signals from collapsing to the front of the listener when they are rendered using a pair of front speakers.

[typhon]

in this diagram, it shows that the rear speaker is phase reversed. is this just for the one speaker that is marked, or both of the rear speakers? what purpose does this serve. i was under the impression that running speakers out of phase was a bad thing. is that just old school thinking?

OK you did ask.....

A dynamic decorrelator for surround sound signals is disclosed. In one embodiment, a mono detection circuit is used to detect the extent to which a left rear surround input signal and a right rear surround input signal are similar. To the extent that the surround input signals are similar, the signals are decorrelated. Decorrelation is performed by a pair of allpass filters that introduce complementary phase shifts in the left rear surround input signal and the right rear surround input signal. The complementary phase shifts are sufficient to prevent the surround signals from collapsing to the front of the listener when they are rendered using a pair of front speakers.

so, this would be part of the digital processing effects to enhance the surround sound mode. correct?

if i replace my system, should i run all of the speakers in phase?