about waveform interpolation

Started by rejoicenana in Speech Coding18 years ago 1 reply

hello all: I have a question.My boss want me to design a codec using waveform interpolation at 600bit/s, Can you give me some...

hello all: I have a question.My boss want me to design a codec using waveform interpolation at 600bit/s, Can you give me some useful advise? Do you think that it can be done? thanks in advance!


windowed sinc interpolation using FIR filter

Started by mata mata in Speech Coding16 years ago

dear All, I have some difficulties in understanding windowed sinc interpolation using FIR filter in adaptive codebook search...

dear All, I have some difficulties in understanding windowed sinc interpolation using FIR filter in adaptive codebook search process of CELP...(g729) anyone have some reference? thx a lot regards, arida


Re: windowed sinc interpolation using FIR filter

Started by wang...@163.com in Speech Coding13 years ago

Hi, It means that FIR filter is designed using truncated sinc function by hamming window. This FIR filter corresponds to a low-pass linear...

Hi, It means that FIR filter is designed using truncated sinc function by hamming window. This FIR filter corresponds to a low-pass linear phase filter and is used to interpolate between speech samples (upsample or downsample). For more information you can consult the theory of band-limited interpolation. > > > > dear All, > > I have some difficulties in understanding w


waveform interpolation

Started by dr_simic in Speech Coding16 years ago 2 replies

I'm trying to implement WI codec,for now just layer I(without quantisation),as it is described in Eddie Choy's thesis,but I don't...

I'm trying to implement WI codec,for now just layer I(without quantisation),as it is described in Eddie Choy's thesis,but I don't get perfectly sounding decoded speech,as they stated,there are audible errors,and these errors usually occur when pitch doubles. Can anybody help me,or send me


waveform interpolation coder with accurate reconstruction

Started by empush2000 in Speech Coding16 years ago 1 reply

Hi everyone, I am currently working on waveform interpolative speech coding. I exploit the usual scheme, but it doesn't provide...

Hi everyone, I am currently working on waveform interpolative speech coding. I exploit the usual scheme, but it doesn't provide accurate (perfect) waveform reconstruction even when using no quantization. Does anyone know any papers/info about perfect reconstruction for waveform


regading PWI-ZFE speech coder

Started by ravichandra reddy in Speech Coding16 years ago 1 reply

hi, i completed my M.tech in DSP. I did my project on " Implementation of Mixed Multi-Band PrototypeWaveform Interpolation-Zinc...

hi, i completed my M.tech in DSP. I did my project on " Implementation of Mixed Multi-Band PrototypeWaveform Interpolation-Zinc Function Excitation (MMBE-PWI-ZFE) Speech coder. here i used Zinc pulses i used for reconstructing the speech signal at the decoder instead of no


Transcoder between G.729 & AMR & G.723.1

Started by gray_1024 in Speech Coding16 years ago

I'm now doing a transcoder between G.729 & G.723.1. Considering the conversion of pitch delay, since G.723.1 encodes speech...

I'm now doing a transcoder between G.729 & G.723.1. Considering the conversion of pitch delay, since G.723.1 encodes speech with 30ms frames, while G.729 with 20ms frames, how can i do? I attempt to convert the pitch delay using linear interpolation, but the perform


melp2400 to melp1200, interpolation

Started by steh...@hotmail.com in Speech Coding11 years ago

Hi, I have converted my speech application from melp2400 to melp1200. I was using fir filter to convert 8KHz speech to 32KHz. Should I need to...

Hi, I have converted my speech application from melp2400 to melp1200. I was using fir filter to convert 8KHz speech to 32KHz. Should I need to change the filter for melp1200??? I think it should work fine because in fact we are using the melp2400 synthesis function without change. When I run my melp1200 speech application with this fir filter I feel as the voice is being lingered on, gives a fadi...