i, I have two floating point arrays say Signal1 = sin(2 * pi * 10 * (.1:.1:10)); Signal2 = sin(2 * pi * 5 * (.1:.1:10)); Now I want to convolve those two signals after fixed point conversion So FixedSignal1 = fi(Signal1,1,16); FixedSignal2 = fi(Signal2,1,16); Output = conv(FixedSignal1,FixedSignal2); The above statement is giving an error ?? Error using ==> conv A and B must be vectors. Can anyone help me in this regard?? Raj
Help in Fixed point toolbox for converting float to fixed
Started by ●February 17, 2005
Reply by ●February 17, 20052005-02-17
Raj, The function conv() is not defined for fixed point datatypes (fi's) in MATLAB. However since you can do + & * with fi's you could infact implement your own convolution function that accepts fixed point values. Thank you. Ashok Charry The Mathworks. <bandaru.rajsekhar@gmail.com> wrote in message news:1108647540.919069.152710@z14g2000cwz.googlegroups.com...> i, > > I have two floating point arrays say > > Signal1 = sin(2 * pi * 10 * (.1:.1:10)); > Signal2 = sin(2 * pi * 5 * (.1:.1:10)); > > Now I want to convolve those two signals after fixed point conversion > > So FixedSignal1 = fi(Signal1,1,16); > FixedSignal2 = fi(Signal2,1,16); > Output = conv(FixedSignal1,FixedSignal2); > The above statement is giving an error > > ?? Error using ==> conv > A and B must be vectors. > > Can anyone help me in this regard?? > > Raj >
Reply by ●February 17, 20052005-02-17
Raj, I forgot to metion that if you have the Filter Design toolbox you could also use the Discrete-time filter object (dfilt) to filter one of your signals using the other one as your coefficients: Signal1 = sin(2 * pi * 10 * (.1:.1:10)); Signal2 = sin(2 * pi * 5 * (.1:.1:10)); FixedSignal1 = fi(Signal1,1,16); FixedSignal2 = fi(Signal2,1,16); % Use FixedSignal1 as your coefficients and FixedSignal2 as your input. % Since the conv length is going to be 199 samples (100+100-1) zeropad the input FixedSignal2(199) = 0; % Set up your filter H = dfilt.dffir; H.Arithmetic = 'fixed'; H.Numerator = FixedSignal1; % Set the input word length to that of FixedSignal2's H.InputFracLength =FixedSignal2.FractionLength; output = filter(H,FixedSignal2); Hope this helps. Thanks, Ashok Charry "Ashok Charry" <acharry@mathworks.com> wrote in message news:cv2991$jrj$1@fred.mathworks.com...> Raj, > > The function conv() is not defined for fixed point datatypes (fi's) in > MATLAB. However since you can do + & * with fi's you could infact > implement your own convolution function that accepts fixed point values. > > Thank you. > > Ashok Charry > The Mathworks. > > <bandaru.rajsekhar@gmail.com> wrote in message > news:1108647540.919069.152710@z14g2000cwz.googlegroups.com... >> i, >> >> I have two floating point arrays say >> >> Signal1 = sin(2 * pi * 10 * (.1:.1:10)); >> Signal2 = sin(2 * pi * 5 * (.1:.1:10)); >> >> Now I want to convolve those two signals after fixed point conversion >> >> So FixedSignal1 = fi(Signal1,1,16); >> FixedSignal2 = fi(Signal2,1,16); >> Output = conv(FixedSignal1,FixedSignal2); >> The above statement is giving an error >> >> ?? Error using ==> conv >> A and B must be vectors. >> >> Can anyone help me in this regard?? >> >> Raj >> > >
Reply by ●February 17, 20052005-02-17
bandaru.rajsekhar@gmail.com wrote:> i, > > I have two floating point arrays say > > Signal1 = sin(2 * pi * 10 * (.1:.1:10)); > Signal2 = sin(2 * pi * 5 * (.1:.1:10)); > > Now I want to convolve those two signals after fixed point conversion > > So FixedSignal1 = fi(Signal1,1,16); > FixedSignal2 = fi(Signal2,1,16); > Output = conv(FixedSignal1,FixedSignal2); > The above statement is giving an error > > ?? Error using ==> conv > A and B must be vectors. > > Can anyone help me in this regard?? > > RajWhat language? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●February 17, 20052005-02-17
"Jerry Avins" <jya@ieee.org> wrote in message news:jeWdnZEid5BvJYnfRVn-2g@rcn.net...> What language?MATLAB! Fixed-point programming in MATLAB.> > Jerry > -- > Engineering is the art of making what you want from things you can get. > �����������������������������������������������������������������������
Reply by ●February 17, 20052005-02-17
Ashok Charry wrote:> "Jerry Avins" <jya@ieee.org> wrote in message > news:jeWdnZEid5BvJYnfRVn-2g@rcn.net... > >>What language? > > > MATLAB! Fixed-point programming in MATLAB.There's a Matlab newsgroup where you can get answers from their staff. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
