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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Transient optimized chain posted by Dave_K on February 20, 2017 at 10:43:04:
Dave:Gaussian filters provides smooth rather than abrupt transitions, both in the frequency and the time domains. It provides a ripple free frequency response, while simultaneously exhibiting an aperiodic (non-ringing) impulse response. It's the aperiodic impulse response that MQA apparently values.
I'm not as familiar with image processing applications, and unsure this is directly comparable to pixel smoothing within an image. Possibly, image processing utilizes Gaussian filters for their natural Guassian shaped frequency domain properties, while MQA utilizes them for their natural Gaussian shaped time domain properties mentioned above.
The narrow channel bandwidth relative to the information bandwidth of CD necessitates the well known SINC function brickwall bandlimiting anti-alias and anti-image filters associated with it. It seems to me that MQA uses a much wider channel bandwidth, not for any musically significant ultrasonic content, but to enable utilization of relatively slow sloped aperiodic filters, such as the Gaussian, without incurring aliasing.
As for the audibility of MQA's time domain optimization, that's the key question for we audiophiles. MQA's strategy seems to be to offer performance benefits to music consumers so that they pull the format, while offering distribution management and cost savings to the music industry so that they push the format. If MQA delivers the promise of a compellingly better sounding digital listening experience combined with lower vendor cost, it has a chance of success. The key words are: compellingly better. Of course, fear of a new format, some of it rational, some of it irrational, is also playing it's usual and expected role.
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Ken Newton
Edits: 02/20/17 02/20/17 02/20/17 02/20/17
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- RE: Transient optimized chain - knewton 13:46:09 02/20/17 (0)
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