Yamaha AVC-50 AVC-50 OWNERS MANUAL - Page 19

Defeat Mode When the selector. is set to the Defeat mode, no surround processing is in effect. (I] (Dolby) Surround With a great number of movies made today, the sound track is specially encoded with the Dolby surround mode for playback in movie theaters equipped with Dolby surround processing sound systems. This is responsible for the incredibly lifelike effect you experience at movie theaters: while dialogue comes at you from the front speakers, sound effects, background noise, and other ambient noise in the sound track conies at you from behind as well. You are literally surrounded in sound. Dolby surround is encoded on the sound track of commercially available video cassettes and video discs as well. When you play tapes encoded with Dolby surround on your home video system, the Dolby surround mode on the AVC-50 decodes the signal and feeds the sound effects, background noise, ambient noise, etc. through your rear speakers so the same surround effect experienced in the theater is experienced in your living room as well. The Dolby surrcund mode will have no effect on video sources not encoded with Dolby surround. The AVC•50 is calibrated so that Dolby Surround signal-tonoise ratio is highest when the volume is set to about 10 dB. Natural Surround The Natural Surround is an exclusive Yamaha surround sound processing mode which is effective with all music and video sources. It creates a natural, lifelike surround effect without the use of delay circuitry, adding considerable depth arid imaging all audio sources. It is recommended for both music listening and for viewing stereo video SWUM Hall Surround This is another exclusive Yamaha surround sound processing mode, designed to recreate a large concert hail sound field effect. It is identical to the Natural Surround mode, with the addition of delay circuitry. This adds an extra dimension of depth and imaging which simulates that of a large, spacious concert hall, and is appropriate for music sources. Note: If a monaural sound source is used when in the Dolby Surround, Natural Surround, or Hall Surround modes, no sound will be heard from the rear speakers. Simulated Stereo The Simulated Stereo mode is another exclusive Yamaha circuit which effectively turns monaural audio sources in natural sounding simulated stereo. When used with mono video programs and mono TV programs, it adds considerable depth and imaging to the sound field. The use of a carefully designed comb filter ensures the most natural sounding effect. Simulated Surround The Simulated Surround mode is also intended for monaural audio sources, such as video and TV programs. It creates a surround sound effect, and employs a delay circuit for an extra dimension of depth and imaging. Delay Time Control The Delay Time control is effective with those three modes employing a delay circuit: Simulated Surround, Hall Surround, and Dolby Surround. It provides continuously variable control over delay time, from 10 to 30 milliseconds The center upright position is a normal delay time setting, however, experimenting with different delay settings will have considerable effect on each surround mode. By applying extra or less delay, sound effects, background noise, and ambient noise coming at you from the rear speakers can be enhanced or subdued for extra effect Adding too much delay will cause an unnatural effect with some sources. Experiment with the Delay Time control to created an effect that you find most suitable. AVC-50 II 19