Holographic Image, Software CD

CHAPTER 5

Holographic Image

The Holographic Image (also called "Sonic Holography") is a unique process which enhances the three- dimensional effects and realism of stereo sound. This is modeled in DSP, from a design based on Bob's legend- ary (and much sought after) Carver C-9 Sonic Holography Generator.

This circuit was designed to over- come a problem in obtaining accurate sound reproduction:

In a stereo system, both ears will hear the output from both speakers. The left ear hears sound from the left speaker and from the right speaker. To see a problem with this, compare what happens when listening to a live musical performance:

During a concert, each ear will receive one direct sound arrival. For example, a cymbal crashes, both your ears will hear it and the brain tells you accurately the position of the musician. In a stereo recording of the concert, this cymbal crash will be heard from both speakers. The left ear will hear the left speaker, which is ﬁne, but it will also hear the crash from the right speaker. These extra sounds tend to confuse the sense of sound source location.

The stereo effect in a good pair of headphones is enhanced because the left ear only hears the left headphone, and the right ear hears only the right headphone. There are no extra sound arrivals.

To summarize :

1.A real musical event will create only two direct sound arrivals, one at the left ear and one at the right.

2.Stereo playback will give four arrivals , as both speakers are heard by each ear. These second sound arrivals reduce our naturally accurate sense of positioning.

The Holographic Image circuit was designed to cancel out the unwanted second arrivals. The left ear will main- ly hear the left speaker and the right ear mainly hears the right speaker. This is accomplished by sending a complex crosstalk signal from the left and right speakers in addition to the normal program. These extra signals are virtually identical to the unwanted second sound arrivals but they are out-of-phase with them and they can- cel each other out.

The result is a more three-dimen- sional and wider soundstage, where the positioning clues are restored. In a way, the musicians have been freed from the conﬁ nes of the ﬂ at plane be- tween the speakers. You will perceive them as playing forward or playing behind the speakers or to one side or the other, not just somewhere in between. We recommend that you ex- periment with its effect, remember that you are listening for a more accurate sense of the location of the different musicians.

Because the Holographic Image works by phase cancellation of the unwanted second sound arrivals, ac- curate speaker positioning is required. You must make sure that the left speaker is the same distance away from you as the right speaker. Follow the front speaker placement on the next page to get the best results. This is the same as any standard stereo system, only with more care taken to position the left and right speakers accurately.

The Hologram circuit can be engaged using the remote control or from the front panel. There is a short mute period until the circuit is fully engaged or disengaged.

Software CD

The TGIV Flash memory software can be upgraded by connecting your PC to the TGIV's RS-232 serial port, and downloading any avail- able update ﬁ les from our website: www.sunﬁ re.com. This is the preferred method, as the software can be up- dated fairly quickly. See page 51 for more details.

Alternatively, the TGIV software can be upgraded using a CD avail- able from Sunﬁ re Technical Support. This CD will be available periodically if there are major software changes since the initial release.

The following notes show the CD upgrade procedure. The CD or DVD player must be connected to the TGIV's digital audio inputs.

1.Turn on your TV, your CD player and the TGIV.

2.Use the TGIV remote to select the On Screen Display.

3.Go to the Settings Menu and then select the Software Menu.

SOFTWARE

UPGRADE SOFTWARE

REVISION LIST

4.Select "Upgrade Software," which brings up a second OSD menu.

5.On the TGIV, select the digital input which will play the CD. Press ENT on the remote (bot- tom right).

6.Press 1,2 and 3 on the remote, then play the CD. The TGIV display will show the status as the CD data is transferred into the TGIV.

7.Turn off the TGIV when the software transfer is complete.

User's Manual