Denon AVP-A1HDCI Literature/Product Sheet - Page 7

Discrete Devices for ultimate performance in each circuit block (D.D.S.C.-HD) The great appeal of a home theater is to be surrounded by dynamic, realistic sound and stunningly beautiful video images. In this age of high-quality 1080p video and high-definition audio, the core of Denon A/V surround sound technology has been the Dynamic Discrete Surround Circuit (D.D.S.C.). Now, Denon has developed the D.D.S.C.-HD circuit so that high-quality HD audio performance is on par with the high quality of video images. This new circuit masterfully embodies Denon' s foremost design concept for A/V surround amps which is to "reproduce content with total fidelity to the original intent of the producer." The D.D.S.C.-HD reproduces with ideal quality the sound of the latest high-grade HD audio sources. Discrete Devices for ultimate performance in each circuit block Dolby TrueHD and DTS-HD Master Audio decoders Three All 32-bit floating point DSPs Audio DACs in dual differential mode (1 per audio channel) on all output channels Master clock design for more accurate processing and less jitter noise Audio ADCs in differential mode (2 per audio channel) on all analog input channels DSP processing of EXT IN analog audio input is possible. Denon surround modes can also be enjoyed with external input audio signals. Advanced AL24 processing provides more dynamic range In AL24 Processing, the internal processing circuit generates 8 lower bits of data which are added to the original 16 higher bits for 24-bit quality output. The circuit then interpolates the digital data so that it as closely as possible reproduces the smoothness of an analog waveform and allows recordings on CD or other digital media to sound the way they should in the natural world. Figure 1 shows the playback sine wave of conventional 16-bit data and how an audio signal that is only output in steps of one LSB is smoothed as if it were 24-bit data. Of course, these differences are also clearly audible: distortion that causes discomfort is reduced and the sound enjoys a superior S/N, free of noise. In addition, Advanced AL24 Processing uses proprietary high-speed signal detection technology and high-speed processing technology to perform high-sampling up conversion on the time axis and produce a sine wave that is even closer to that of an analog signal. Besides expanding the conventional number of bits, Advanced AL24 Processing uses high-speed arithmetic processing algorithms developed by Denon to observe and analyze sample groups of the original data and make interpolations associated with up sampling and frequency range expansion. Figure 2 shows the features of arithmetic processing. If we observe the sine wave of a relatively large attack signal assuming an actual music signal, we can easily see how different it is from conventional processing. While considerable ringing occurs with general FIR filters both before and after the attack signal, there is little ringing with Advanced AL24 Processing and we can see how well suited this technology is for the reproducibility of sine waves. Since greater efficiency in processing and higher processing capacity allow data samples to be processed in one stage across a wide range, signals can also be interpolated with greater accuracy compared to methods such as multi-stage configurations that use conventional digital filters. In addition, the over sampling rate has been boosted to 16fs from 8fs to facilitate the expansion of data volume that contains a more detailed, natural sound. The sonic result for the audiophile is the ability to enjoy musical recordings with the full ambience of the concert hall replete with its spaciousness and the movements of musicians. Audio Input HDMI Denon Link Digital In Zone4 Digital Out Zone2 Digital Out 8ch Ext. In Analog In L R HDMI Rx DIT LVDS SELECTOR ADC ADC ADC ADC ADC AVP-A1HDCI AUDIO BLOCK DIAGRAM Advanced AL24 Multichannel Processing with PLL Digital Interface Receiver DSP 32bit Floating point DSP 32bit Floating point DSP 32bit Floating point FPGA 192kHz/24bit DAC DAC DAC DAC DAC DAC DAC DAC DAC DAC DAC DAC DAC DAC DAC Pre output XLR Front L RCA XLR Front R RCA XLR Centre RCA XLR Subwoofer RCA XLR Surround LA RCA XLR Surround RA RCA XLR Surround LB RCA XLR Surround RB RCA XLR Surround Back L RCA XLR Surround Back R RCA XLR Subwoofer 2 RCA XLR Subwoofer 3 RCA Zone2 L Zone2 R Zone3 L Zone3 R Figure 1 1 kHz,-90 dB sine waves (CD playback) Conventional system AL24 Processing Compared by impulse response(24-bit,96kHz) Conventional system AL24 Processing Figure 2 Playback sine waves with attack sounds Conventional system AL24 Processing 12 13