Download Voices from the Mountain - Oral Testimonies from Wollo, by Panos Publications PDF

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This is the famous Nyquist theorem on sampling (also called the Shannon theorem). 2). 2, 2b). 2, 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). 3a, in both cases restitution of the original signal is perfectly possible.

2 Quantization stage characteristics. however, such overflows or underflows are avoided by careful scaling of the input signal. So, in the general case, we can say that: –Q/2 < e(n) < Q/2 where e(n) is the quantization error for a given sample n. 3). 3 Probability density function of quantization error. 4). In this manner, the quantization error is often called quantization noise, and a ‘signal-to-quantization noise’ ratio can be calculated. 4 Analogy between quantization error and noise. 76 A 16-bit system, therefore, gives a theoretical signal-to-noise ratio of 98 dB; a 14-bit system gives 86 dB.

Editing of the recording is performed on a digital audio editor by means of digital audio processors and VTRs. The final result is stored on a VTR tape or cassette. The cutting machine used is a digital version. 17 A short history of audio technology Figure XIV Digital audio editing and record production. When the mixer is replaced by a digital version and – in the distant future – a digital microphone is used, the whole production system will be digitized. Digital audio broadcasting Since 1978, FM broadcasting stations have expressed a great deal of interest in digital tape recorders, realizing the benefits they could bring almost as soon as they had been developed.

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