[HW] - KOMPRESE ZVUKU

PaPouch papouch
Středa Březen 17 11:43:16 CET 2004


Nelinearni komprese se bezne pouziva pro dig. prenos zvuku. Jsou na to dva
standardy - u(mikro)-law (americky) a A-law (evropsky). 16 bitu se
komprimuje do 8 a po expanzi je mozne ziskat  signal odpovidajici kvlaitou
14 bitovemu
kodovani.

Pavel Poucha


-----Původní zpráva-----
Od: Snail Instruments <snail@iol.cz>
Komu: Multiple recipients of list <hw-news@list.gin.cz>
Datum: 22. srpna 1999 10:26
Předmět: Re: [HW] - KOMPRESE ZVUKU


>Jeste ke kompresi zvuku - v konferenci Chipdir se objevil nasledujici
>zajimavy prispevek, urcite stoji za to, vzit uvedene skutecnosti v uvahu.
>
>>What seems to be important when you work with speech is the fact that =
>>speech
>>is made of low intensity sound that should be precisely rendered and =
>>high
>>intensity "spikes" (I mean with infrequent rises ) that should be =
>>rendered
>>too.=20
>>Of course, if you sample at 16 or 24 bit you can get a perfect sound =
>>quality
>>respective to what we discussed. The trick is to use a non-linear =
>>analog-to
>>digital converter to digitize the speech. The difference in input =
>>change
>>that makes the digital output change is smaller if the amplitude is low =
>>than
>>when it is high.
>
>J. Hanzal
>
>
>======================================================================
>Electronical devices for chemical laboratory, custom electonics design
>----------------------------------------------------------------------
>Snail Instruments                     Josef Hanzal, M. S.
>Vojanova 615                          phone/fax: +420-311-24433
>266 01 Beroun                         e-mail: snail@iol.cz
>Czech Republic                        URL: http://www.vitrum.cz/snail/
>======================================================================
>
>






Další informace o konferenci Hw-list