The mechanism of lowered noise floor is as previously discussed, that is, quantization noise power has not been reduced, but the noise spectrum has been spread over 16?the audio bandwidth.
22.
Real analog-to-digital converters also have other sources of noise that further decrease the SNR compared to the theoretical maximum from the idealized quantization noise, including the intentional addition of dither.
23.
At offsets far removed from the carrier, the phase-noise floor of a DDS is determined by the power sum of the DAC quantization noise floor and the reference clock phase noise floor.
24.
LPC may be thought of as a basic perceptual coding technique : reconstruction of an audio signal using a linear predictor shapes the coder's quantization noise into the spectrum of the target signal, partially masking it.
25.
Here, optimal performance means maximizing the apparent dynamic range of the resultant signal while simultaneously minimizing the audible effects of the dither and quantization noise which, if this is not achieved, are typically tonal in nature.
26.
In other words, integers have round-off that is uniform, always rounding the LSB to 0 or 1, and floating point has SNR that is uniform, the quantization noise level is always of a certain proportion to the signal level.
27.
When the sampling frequency is doubled, the signal to quantization noise is improved by \ scriptstyle 10 \ log ( 2 ^ { 2N + 1 } ) \, dB for a \ scriptstyle \ mathrm { N }-order ??-modulator.
28.
The quantization noise level is directly determined by this number, decreasing exponentially as the resolution increases ( or linearly in dB units ), and with an adequate number of true bits of quantization, random noise from other sources will dominate and completely mask the quantization noise.
29.
The quantization noise level is directly determined by this number, decreasing exponentially as the resolution increases ( or linearly in dB units ), and with an adequate number of true bits of quantization, random noise from other sources will dominate and completely mask the quantization noise.
30.
With each additional bit added to a sample, quantization error is reduced by approximately 6 dB . For example, CD audio uses 16 bits per sample, and therefore will have quantization noise approximately 96 dB below the maximum possible sound pressure level ( when summed over the full bandwidth)
