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Advantages & Disadvantages of ACELP & QCELP

Started by prob...@yahoo.com in Speech Coding17 years ago 1 reply

Hi, my name is Novi, I would like to know the advantages of disadvantages of ACELP & QCELP, when compared to CELP. Can anyone please tell me?...

Hi, my name is Novi, I would like to know the advantages of disadvantages of ACELP & QCELP, when compared to CELP. Can anyone please tell me? Thank you very much..


channel coding

Started by rakesh singh in Speech Coding22 years ago

Hi everyone, I am trying to implement "combined speech & channel coding" on an ADSP processor. It involves convolutional coding...

Hi everyone, I am trying to implement "combined speech & channel coding" on an ADSP processor. It involves convolutional coding with viterbi decoding. CELP to be used for speech coding. Channel will be modelled as Rayleigh fading channel.I have just stated the wor


simple real time implementation

Started by Syed Moinuddin in Speech Coding23 years ago

Hi all, i am now looking for simple realtime implementation of codec (pseudo-celp) . The codec api gives me samples in array buffer ...

Hi all, i am now looking for simple realtime implementation of codec (pseudo-celp) . The codec api gives me samples in array buffer #define BUF_SIZE 240 int buffer[BUF_SIZE]; now i start in this way dc_rmv(buffer,filtersp); and carry on with rest of modules , like lpc,lpc


Adaptive Codebook generation in AMR speech codec

Started by abhi...@gmail.com in Speech Coding18 years ago

Hi, I am working on a project that implements CELP coding, as in AMR codec for GSM. The codec uses a 'codebook' to store 'code vectors', which...

Hi, I am working on a project that implements CELP coding, as in AMR codec for GSM. The codec uses a 'codebook' to store 'code vectors', which are compared with excitation vectors and the error minimised till a match is found. This match is used to synthesise speech. The spec I am using, 3GPP TS 26.090 ver 6.0.0, r6, specifies codebook architecture but not how it is created. So how is this


Senior Engineer (Speech and Video) needed in Red Bank, NJ

Started by s_boucheryah in Speech Coding22 years ago 1 reply

The Voice Enhancement Solutions division of NMS Communications is looking for a senior engineer for multimedia gateway project with ...

The Voice Enhancement Solutions division of NMS Communications is looking for a senior engineer for multimedia gateway project with speech signal processing and/or video processing experience to join the multimedia team. Candidate should be skilled in the area of CELP based speech co


How to adjust timing of speech frame

Started by dbga...@gmail.com in Speech Coding15 years ago 6 replies

Hi, Anyone here know a method to adjust timing of 22.5ms speech frames to 20ms. I am working with different vocoders including AMBE (Advanced...

Hi, Anyone here know a method to adjust timing of 22.5ms speech frames to 20ms. I am working with different vocoders including AMBE (Advanced Multiband Excitation) versus CELP/VSELP. The generated vocoder frames are originally 22.5ms, but the vocoder DSP chip takes in 20ms. Basically, are there techniques that exist such as time compression, post-filtering/processing, duplicating speech fra...


lpc10 vs celp

Started by dunjie17 in Speech Coding19 years ago 1 reply

hi all, am new to speech coding and trying to understand the principles. stumbled upon this website: ...

hi all, am new to speech coding and trying to understand the principles. stumbled upon this website: http://svr-www.eng.cam.ac.uk/~ajr/SA95 /node87.html and it lists the areas to be addressed in LPC


enhancement of packet loss-concealment of g729 standrd usin wsola.

Started by mmusdz in Speech Coding18 years ago

Hi I am the final year engineering student, my aim is to enhence the g729 standard. Could anybody give me some relative info or give me the...

Hi I am the final year engineering student, my aim is to enhence the g729 standard. Could anybody give me some relative info or give me the source code in C++ about time-scale modification by WSOLA, GRE on the G 729 strandard relative to the paper : (A Packet Loss Concealment Algorithm Based on Time-Scale Modification for CELP-type Speech Coders ) ? Or introduce some good books i


Algebraic codebook

Started by Dong-Won Lee in Speech Coding23 years ago

1) What is algebraic celp is a Code Excited LP   There are some kind of code, and we can express code...

1) What is algebraic celp is a Code Excited LP   There are some kind of code, and we can express code in some ways