pin 寫: Raymond Wan 寫: cocacola99 寫: oh, my 5507 onkyo av pre amp only uses 1795x6 instead of 1796 by the same brand av amp
Technically, PCM1795 (32 Bit) is better than PCM1796 (24 Bit)
Burr Brown PCM DAC
最高級：
132dB SNR 24Bit 192kHz 採樣[最高性能] 立體聲DAC（硬件控制）----- 1794A（24 Bit）
132dB SNR 24Bit 192kHz 採樣[最高性能] 立體聲DAC（軟件控制）----- 1792A（24 Bit）
高級：
123dB SNR 32Bit 200kHz 採樣[高級] 立體聲DAC ---------------------------- 1795（32 Bit）
123dB SNR 24Bit 192kHz 採樣立體聲DAC（軟件控制）----------------- 1796（24 Bit）
123dB SNR 24Bit 192kHz 採樣立體聲DAC（硬件控制）------------------ 1798（24 Bit）
中端：
105dB SNR 8 Channel 音頻DAC -------------------------- 1680
113dB SNR 8 Channel 音頻DAC --------------------------- 1690
113dB SNR 立體聲音頻DAC（硬件控制）--------- 1791
以上資料總結，現在的主流AV 前級及擴音機都沒使用多顆頂級32Bit 或132dB SNR 的1792A 或1794A 或1795 的頂級配置。
高級大都只使用了24Bit 192kHz 的DAC，中、高端功放用多顆120dB 以上的stereo 立體聲DAC，中端用多顆113dB 的stereo 立體聲DAC。中低端就是單顆8 Channel 多聲道的DAC 了。
所從要比較埋 SNR (Signal Noise Ratio) 這個重要性能指標
Burr Brown / TI
Wolfson
All Wolfson noise floor is much better than others, besides for the no. of DAC like XXX x pcs, it is depend it use as parallel connection to decode, or just have more DAC for each channel (
it only work for multi-channel input NOT digital decode!!)
For AV Preamp / Amp:It appears for Digital Audio Input such as HDMI, the signal will be decoded and sent out as LPCM to DAC to process ?
Hence, all the audio signal will be processed by the DAC before output for amplification by power ampilifers.
Digital Input --> HDMI/DSP Processor --> Digital/Analog Converter (DAC) --> Analog Output
Analog Input --> Analog/Digital Converter (ADC) --> DSP --> Digital/Analog Converter (DAC) --> Analog Output
Digital Signal Processing is handled by DSP Engines such as SHARC®
For example, Lexicon MC-12 EQ uses SHARC® x 8 + Cirrus Logic x 1 for DSP Audio.
Note:
Super Harvard Architecture Single-Chip Computer (SHARC) is a high performance floating-point and fixed-point DSP from Analog Devices.
For Blu-ray Player:Digital: Blu-ray Audio HD Signal --> Audio Decoder --> LPCM (HDMI Output)
Analog: Blu-ray Audio HD Signal --> Audio Decoder --> DAC --> Analog (RCA Output)
Hence, if audio signal is transmitted via HDMI, the DAC inside the blu-ray is not functioning.
No matter how good the DACs are, they are wasted (not being used at all).
It is acting just as a blu-ray transport.
Blu-ray Player (HDMI) Digital Output
Blu-ray Player (RCA) Analog Output
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