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Ποιότητα cd vs steaming vs HI-Res audio vs Βινύλιο
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<blockquote data-quote="steadyshot" data-source="post: 1058956579" data-attributes="member: 39136"><p>Here's a breakdown of how oversampling benefits Digital-to-Analog Converters (DACs) and audio quality, especially compared to the CD standard:</p><p></p><p><strong>What is Oversampling?</strong></p><p></p><ul> <li data-xf-list-type="ul">Oversampling involves increasing the sampling rate of a digital audio signal above its original value. For example, CD-quality audio has a sample rate of 44.1 kHz. Oversampling might multiply that rate by 4x, 8x, or even higher.</li> <li data-xf-list-type="ul">This process doesn't add more detail to the original signal. Instead, it spreads existing quantization errors (introduced when converting analog to digital) over a wider frequency range.</li> </ul><p><strong>How Oversampling Helps DACs</strong></p><p></p><ol> <li data-xf-list-type="ol"><strong>Simplified Reconstruction Filter:</strong><ul> <li data-xf-list-type="ul">The reconstruction filter in a DAC removes very high-frequency artifacts (above the audible range) created by the digital-to-analog conversion process. These artifacts are a form of noise.</li> <li data-xf-list-type="ul">Oversampling shifts these artifacts much higher in frequency. This allows the DAC to use a gentler, less complex analog filter. Simpler filters usually have better phase response, preserving the time relationships between different frequencies in the audio signal for more accurate sound reproduction.</li> </ul></li> <li data-xf-list-type="ol"><strong>Reduced Noise:</strong><ul> <li data-xf-list-type="ul">As mentioned, oversampling spreads quantization noise over a wider frequency range. Much of that noise gets pushed above the range of human hearing. When the reconstruction filter removes these ultrasonic frequencies, it significantly reduces the audible noise floor. This leads to a cleaner, more transparent sound.</li> </ul></li> </ol><p><strong>Sound Quality Benefits vs. CD</strong></p><p></p><ul> <li data-xf-list-type="ul"><strong>Improved Dynamics:</strong> The lower noise floor achieved with oversampling allows very quiet passages in the music to be reproduced more faithfully, enhancing dynamic range.</li> <li data-xf-list-type="ul"><strong>Enhanced Detail:</strong> Although oversampling doesn't technically increase resolution, subtle low-level details become more apparent due to the reduction in noise.</li> <li data-xf-list-type="ul"><strong>Smoother Highs:</strong> The potential for harshness in high frequencies is reduced thanks to the less aggressive reconstruction filtering.</li> <li data-xf-list-type="ul"><strong>More Spacious Sound:</strong> Improved time-domain accuracy (from the simpler filter) helps create a more realistic and convincing soundstage for the listener.</li> </ul><p>Ανάλογα oφέλη έχει και το αρχείο όταν είναι high res</p></blockquote><p></p>
[QUOTE="steadyshot, post: 1058956579, member: 39136"] Here's a breakdown of how oversampling benefits Digital-to-Analog Converters (DACs) and audio quality, especially compared to the CD standard: [B]What is Oversampling?[/B] [LIST] [*]Oversampling involves increasing the sampling rate of a digital audio signal above its original value. For example, CD-quality audio has a sample rate of 44.1 kHz. Oversampling might multiply that rate by 4x, 8x, or even higher. [*]This process doesn't add more detail to the original signal. Instead, it spreads existing quantization errors (introduced when converting analog to digital) over a wider frequency range. [/LIST] [B]How Oversampling Helps DACs[/B] [LIST=1] [*][B]Simplified Reconstruction Filter:[/B] [LIST] [*]The reconstruction filter in a DAC removes very high-frequency artifacts (above the audible range) created by the digital-to-analog conversion process. These artifacts are a form of noise. [*]Oversampling shifts these artifacts much higher in frequency. This allows the DAC to use a gentler, less complex analog filter. Simpler filters usually have better phase response, preserving the time relationships between different frequencies in the audio signal for more accurate sound reproduction. [/LIST] [*][B]Reduced Noise:[/B] [LIST] [*]As mentioned, oversampling spreads quantization noise over a wider frequency range. Much of that noise gets pushed above the range of human hearing. When the reconstruction filter removes these ultrasonic frequencies, it significantly reduces the audible noise floor. This leads to a cleaner, more transparent sound. [/LIST] [/LIST] [B]Sound Quality Benefits vs. CD[/B] [LIST] [*][B]Improved Dynamics:[/B] The lower noise floor achieved with oversampling allows very quiet passages in the music to be reproduced more faithfully, enhancing dynamic range. [*][B]Enhanced Detail:[/B] Although oversampling doesn't technically increase resolution, subtle low-level details become more apparent due to the reduction in noise. [*][B]Smoother Highs:[/B] The potential for harshness in high frequencies is reduced thanks to the less aggressive reconstruction filtering. [*][B]More Spacious Sound:[/B] Improved time-domain accuracy (from the simpler filter) helps create a more realistic and convincing soundstage for the listener. [/LIST] Ανάλογα oφέλη έχει και το αρχείο όταν είναι high res [/QUOTE]
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