2 Description 
The Dolby Surround Pro Logic decoder integrated in the transmitter uses the stereo input signal to derive | 2.6 Dolby Surround Pro Logic | |
two additional signals, a center and a surround channel. The IVA circuitry generates from these signals a | Decoder | |
binaural signal equivalent to reproduction through five high quality loudspeakers (three front, two rear |
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speakers). This allows you to enjoy all the benefits of Dolby surround sound even through headphones. |
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The integrated LOGIC7 decoder allows recordings in all audio formats (mono, stereo, Dolby Surround, and LOGIC7) to be accurately reproduced through headphones. Depending on the momentary signal configuration, two to eight loudspeakers are simulated at any time. Accordingly, the number of simulat- ed speakers may even change automatically during the same piece.
Also, the LOGIC7 decoder will derive a surround signal from a stereo input signal and is fully compatible to Dolby Surround.
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2.7 LOGIC7 Decoder
2.8Controls 2.8.1 Headphones Refer to fig. 1.
Fig. 1: Headphone controls.
1.OFF/ON: On/off switch
2.Status LED (green/red):
The Status LED indicates the following conditions:
LED is lit green. | • Headphones are ON, batteries are OK. | |
LED is dark. | • | Headphones are OFF. |
| • Headphones are ON, batteries are dead or no batteries are | |
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| inside the headphones. |
LED is lit red. | • | Headphones are OFF, batteries are being charged. |
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3.Charging jack and contacts
4.Battery compartment (beneath the detachable ear pad)
5.Frequency selector
6.VOLUME control
7.BALANCE control
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12 | 8 |
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2.8.2Transmitter
Front Panel Refer to fig. 2.
Fig. 2: Transmitter front panel controls.
The MODE, FREQ, and SOUND keys have dual functions. To toggle between the two functions, press Note: and hold the key for one second.
If you hold the key for more than one second, the transmitter will keep toggling between the two func- tions of the key you are pressing.
8.ON: Switches the transmitter on (switch illuminates green) and off (switch extinguishes).
9.MODE/DISPLAY: A short push (less than one second) steps through normal stereo, IVA stereo, IVA plus Dolby Surround Pro Logic, and IVA plus LOGIC7 modes.
A long push switches the backlighting for all labels except the ON switch and the CHARGE label on and off.
If you switch the backlighting off, it will come back on automatically as soon as you push any front panel switch.
If you switch the transmitter off and back on later, the backlighting will come on again, even if you switched the backlighting off.
The PRO LOGIC, LOGIC7, STEREO, and IVA labels will illuminate to indicate the selected mode:
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HEARO 888 DIGITAL