Wav File
in [DSP]
|
Prev: IIR and FIR filters
Next: Possible repost - Using least squares cubic spline fitting asa "filter", what is analogus to Nyquist criterion?
From: aaronde on 12 Nov 2009 21:51 Hi I reading a Wav file in C++. I need to convert the PCM values to float values for further DSP manipulation (Filtering etc ...). Do I need to do this through a conversion from Hex to binary unsigned 2 complement values then to integers ? Thus anyone know of any available function in C/C++ ? Am I missing something ? Thanks and Regards Aaron
From: Jerry Avins on 12 Nov 2009 22:19 aaronde wrote: > Hi > > I reading a Wav file in C++. I need to convert the PCM values to float > values for further DSP manipulation (Filtering etc ...). Do I need to do > this through a conversion from Hex to binary unsigned 2 complement values > then to integers ? Thus anyone know of any available function in C/C++ ? Am > I missing something ? I suspect that you are in serious trouble if you don't know that hex and binary represent exactly the same thing. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
From: Vladimir Vassilevsky on 12 Nov 2009 22:29 aaronde wrote: > Hi > > I reading a Wav file in C++. I need to convert the PCM values to float > values for further DSP manipulation (Filtering etc ...). Do I need to do > this through a conversion from Hex to binary unsigned 2 complement values > then to integers ? Thus anyone know of any available function in C/C++ ? Am > I missing something ? Sometimes the idiocy of modern programmers is just unbelievable. VLV
From: aaronde on 12 Nov 2009 23:29 > > >aaronde wrote: > >> Hi >> >> I reading a Wav file in C++. I need to convert the PCM values to float >> values for further DSP manipulation (Filtering etc ...). Do I need to do >> this through a conversion from Hex to binary unsigned 2 complement values >> then to integers ? Thus anyone know of any available function in C/C++ ? Am >> I missing something ? > >Sometimes the idiocy of modern programmers is just unbelievable. > >VLV > Hi Thanks for calling me an idiot. Really nice of you I suppose you were born knowing everything and you never asked a simple and dumb question. No one forced you to reply or read the post if you think it so stupid. On the other hand I would appreciate any help as this is the first time I am doing such work. Okey I know that hex and binary are the representation of the same thing. My question was that you can't apply a dsp operation using the PCM values. If I read the wav file and get a Hex value of 8A this has to be represented as an float type ie conveted and rescaled to a range between -1 and 1 in order to apply further operations. My question was weather there is a built in fucntion in C/C++. Please excuse me if I am not clear with my question Thanks and Regards Aaron
From: Les Cargill on 12 Nov 2009 23:44
aaronde wrote: >> >> aaronde wrote: >> >>> Hi >>> >>> I reading a Wav file in C++. I need to convert the PCM values to float >>> values for further DSP manipulation (Filtering etc ...). Do I need to > do >>> this through a conversion from Hex to binary unsigned 2 complement > values >>> then to integers ? Thus anyone know of any available function in C/C++ > ? Am >>> I missing something ? >> Sometimes the idiocy of modern programmers is just unbelievable. >> >> VLV >> > > Hi > > Thanks for calling me an idiot. Really nice of you I suppose you were born > knowing everything and you never asked a simple and dumb question. No one > forced you to reply or read the post if you think it so stupid. On the > other hand I would appreciate any help as this is the first time I am doing > such work. > > Okey I know that hex and binary are the representation of the same thing. > My question was that you can't apply a dsp operation using the PCM values. > If I read the wav file and get a Hex value of 8A this has to be > represented as an float type ie conveted and rescaled to a range between -1 > and 1 in order to apply further operations. My question was weather there > is a built in fucntion in C/C++. Please excuse me if I am not clear with my > question > > Thanks and Regards > Aaron You need to use either the plain assignment operator or a cast. short number = 55; double dnumber = number; -- or -- double dnumber = (double) number; depending on which sort of compiler you use and what options are enabled. -- Les Cargill |