By Ulrich Reimers
The electronic Video Broadcasting undertaking (DVB) is an industry-led consortium of over three hundred broadcasters, brands, community operators, software program builders, regulatory our bodies and others in over forty international locations dedicated to designing international criteria for the supply of electronic tv and information prone. Ulrich Reimers is the chairman of its Technical Module and is hence in a position to offer updated insider info. This moment variation of the ebook used to be revised and considerably prolonged via a brand new workforce of authors led via Professor Reimers. New chapters contain facts Broadcasting, suggestions for Interactive prone, and the promising Multimedia domestic Platform (MHP). considerably revised are these on MPEG-2 structures and multiplexing, the traditional for terrestrial transmission and its interpreting method, and the 1st bankruptcy, the creation to the DVB world.
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Extra resources for DVB: The Family of International Standards for Digital Video Broadcasting
By sinusoidal tones or narrow-band noises with a long duration. In the following section the effects observed in sound events of a very short duration will be discussed. 2 Time-dependent Masking Effects In this section we will examine the question to which degree masking effects occur in maskers of a very short signal duration. In order to determine this, subjects were each exposed to a masking impulse of white Gaussian noise with an amplitude of LwN for a duration of 0:5 s. 5a). The subjects had the task of adjusting the amplitude of this Gaussian impulse so that it was just imperceptible.
1 Representation of Audio Signals Apart from the bit-parallel processing of digital audio signals (which chiefly takes place inside equipment), bit-serial transmission has been adopted in the professional studio and for consumer use. One of the signal formats used (AES/EBU) is described in [IEC 958]. It is structured in subframes of 32-bit lengths, each of which, apart from one audio-signal sample (of a length of up to 24 bits), contains the synchronising characters, the parity bit and one information bit.
8). However, in general we are not concerned with one single masker, but with a music or speech signal which is far more complex. Figure 3·93 shows an example of three sinusoidal tones which function as maskers. These do not only mask signal parts in the subbands in which the masking noise itself is detected, but also in neighbouring bands. In figure 3·9 the auditory sensation area which is masked by these three tones is hatched in. The quantisation noise may cover this area without it being perceptible to the listener.