Sample rate converter software free

Here such result will be on an output of hi-end audio converter :. We see only recurrence of input signal, without in addition appearing frequency components - "artifacts". Level of artifacts less minus dB. Less quantizations error level for bit samples minus dB.

Inevitable loose quantizations errors will mask "artifacts". The high and middle quality audio converter of sampling frequency will give a following picture:. Here shown "artifacts" having a level near minus dB dark blue color. These "artifacts" arise, both at interpolation, and at insufficient suppression before decreasing sampling rate of the "parasitic" signals located above half of frequency of digitization.

Let's look for comparison the spectral diagram of too low quality converter:. In this case "artifacts" achieve a level near minus 50 … 60 dB red and pink colors. The filter should pass audio a signal at different frequencies from 0 up to Hz without changing loudness useful. For this purpose inflating of the frequency characteristic on different frequencies at passage through the filter should not exceed change of a level of loudness of output signal less 1 … 2 dB.

As much as possible to keep waveform of transformed audio signal it is required to provide an identical time delay for all spectral components at passage through the filter. It is provided, if the filter have linear phase-frequency characteristic.

Linear is means in the form of a flat inclined line. At such form of the phase characteristic all spectral components have an identical delay.

It is especially important for maintenance of quality sounds with sharp attack drums, piano, guitar, etc. Besides filters have such feature, as "ringing". It parasitic filter's output self-oscillation by sharply changing of input signal. Apply impulse to input of converter. At output the impulse turns to the oscillation stretched on time.

The more "sharp" recession to a level between pass bands and suppression band of filter, the more level of "ringing". Therefore it is necessary for developer of the converter to choose the compromise between a sharpness of recession of filter's amplitude-frequency characteristic that in the most positive influences to suppression of "artifacts" and level of "ringing".

Very heavy case, when final result of conversion is sample rate 44,1 kHz. Between the maximal frequency of a useful signal 20 kHz and half of frequency of digitization 22,05 kHz the difference on frequency makes only 2,05 kHz. At a desirable degree of suppression of artifacts nearby dB!!! Quality of sampling rate conversion depend at: - quality of interpolation; - value of oversampling frequency; - quality of filtration before decreasing of sampling rate.

For the majority of modern records bit samples is used. It achieve theoretical level of quantizations noise minus dB. Accordingly the level of all transformation's "artifacts" should not exceed minus dB.

Thus "artifacts" will masked in noise of quantizations. There is no reasons make level of "artifacts" less noise of quantizations. Quality of converting signal is provided with filter's linearity phase and evenness of frequency response.

See description high precision sample rate converter AuI ConverteR 48x About reasons of using optimal sample rate pdf. All Rights Reserved. All prices at this site in the U. The prices are recommended. All information at this site is not a public offer.

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Color variants, more included click to enlarge :. PRO Resampler Professional sample rate converter. Offers you the highest quality sample rate conversion. A "must have" solution if you wish to get one of the best quality conversions available on the market.