Yamaha DVR-S150 Owners Manual - Page 94

Glossary Sound field programs ■ CINEMA DSP (Digital Sound Field Processor) Since the Dolby Surround and DTS systems were originally designed for use in movie theaters, their effect is best felt in a theater having many speakers and designed for acoustic effects. Since home conditions, such as room size, wall material, number of speakers, and so on, can differ so widely, it's inevitable that there are differences in the sound heard as well. Based on a wealth of actually measured data, YAMAHA CINEMA DSP uses YAMAHA original sound field technology to combine Dolby Pro Logic, Dolby Digital and DTS systems to provide the visual and audio experience of movie theater in the listening room of your own home. ■ "SILENT CINEMA" "SILENT CINEMA" was developed by YAMAHA as a natural, realistic sound effect DSP algorithm for headphones. Parameters for headphones have been set for each sound field so that accurate representations of all the sound field programs can be enjoyed on headphones. ■ Virtual CINEMA DSP YAMAHA has developed a Virtual CINEMA DSP algorithm that allows you to enjoy DSP sound field surround effects even without any surround speakers by using virtual surround speakers. It is even possible to enjoy Virtual CINEMA DSP using a minimal two-speaker system that does not include a center speaker. Audio information ■ Bit stream A signal that is compressed and changed into digital format. Then depending on the decoder it can be processed as 5.1 multi-channel audio. ■ Channel (ch) A channel is an audio type that has been divided based on range and other characteristics. Ex. 5.1 channel • Front speakers, Left (1ch), Right (1ch) • Center speaker (1 ch) • Surround speakers, Left (1ch), Right (1ch) • Subwoofer (1 ch x 0.1* = 0.1 ch) * In contrast to a full 1-channel band, a component designed to enhance low frequency sound for added effect. ■ Dynamic range The difference between the smallest sound that can be heard above the equipment noise and the biggest sound that can be heard without distortion is the dynamic range. ■ LFE (Low Frequency Effect) 0.1 channel This channel is for the reproduction of low bass signals. The frequency range for this channel is 20 Hz to 120 Hz. This channel is counted as 0.1 because it only enforces a low frequency range compared to the full-range reproduced by the other 5/6 channels in Dolby Digital or DTS 5.1/6.1-channel systems. ■ Sampling frequency and quantized bit rate When converting an analog signal to digital, the number of times the signal is sampled per second is called the sampling frequency, while the degree of fineness when converting the sound level into a numeric value is called the quantized bit rate. The frequency band that can be played back is determined by the sampling rate, while the dynamic range expressing the difference in sound level is determined by the quantized bit rate. In principle, the higher the sampling rate, the wider the frequency range that can be played back, and the higher the quantized bit rate, the finer the sound that can be reproduced. APPENDIX 89