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Meant to attract audio engineers, scholars and hi-fi fanatics, this ebook covers parts comparable to: the rules of electronic sign processing; codes for electronic magnetic recording; compact disc encoding; and electronic audio recording platforms
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Extra resources for Digital Audio and Compact Disc Technology
3b) can be seen to contain the same spectrum as the analog signal, together with repetitions of the spectrum modulated around multiples of the sampling frequency. As a consequence, low-pass filtering can completely isolate and thus completely recover the analog signal. 3 show two sine waves (bottom traces) and their sampled equivalents (top traces). 3 Two examples of sine waves together with sampled versions (a) (top) 1 kHz sine wave (b) (bottom) 10 kHz sine wave. 3a, in both cases restitution of the original signal is perfectly possible.
As sampling rate increases, the differences between previous and present samples become smaller, so that, in the extreme for very high sampling rates, only 1 bit is needed for the error signal to indicate the sign of the error; in this case we talk about delta modulation. 7 shows a basic single-bit A/D converter. The input signal is compared with the output of a 1-bit D/A converter, the resulting voltage is then compared with a reference and the output used to increment or decrement the DAC value.
1 kHz, was commonly agreed upon by the establishers of the standard. Video 8 PCM The video 8 recording standard also has a provision for PCM recording. 6). However, sampling frequency must be reduced to allow the data to fit. Nevertheless, as the sampling frequency is exactly twice the video horizontal frequency (fh), the audio frequency range is still more than 15 kHz, which is still acceptable for hi-fi recording purposes. 1 lists the horizontal frequencies for PAL and NTSC television standards, giving resultant sampling frequencies.