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Looking for some journals/reports on 'frequency shaping' and 'amplitude compression' for heaing aid
inHi all! I am working on designing a digital hearing aid as my MSc project. I have already done the simulation part, but for my report I need some...
Hi all! I am working on designing a digital hearing aid as my MSc project. I have already done the simulation part, but for my report I need some stuff on 'Frequency Shaping' and 'Amplitude Compression'. I browsed the internet alot, but couldn't find anything. If anyone could help, I would really appreciate. My email address is w...@yahoo.com. Many Thanks...
Extracting SNR from FFT
inDear All Does anyone here already coded a SNR computation from FFT bins ? I already coded a FFT algo in C, it is ok, but I cannot succeed in...
Dear All Does anyone here already coded a SNR computation from FFT bins ? I already coded a FFT algo in C, it is ok, but I cannot succeed in coding a SNR extraction from the FFT bins. I use a blackman harris 7 windows (7 bins in signal) My FFT table fft[] represents all fft bins in dB - I search the max bin value from FFT table fft[] - for(-3 bins to +3 bins around the above max bin)...
Spetral Subtraction in Wavelet Domain
inHi all, Has anyone here done Spectral Subtraction in Wavelet Domain? How is this different from the one in FFT domain? I have estimated the...
Hi all, Has anyone here done Spectral Subtraction in Wavelet Domain? How is this different from the one in FFT domain? I have estimated the noise frame from the silence periods in the Noisy speech signal. Now the next step is applying DWT. My question is 1) Should i apply DWT to Noise Estimate frame and Noisy speech frame by frame or at once i.e. I have one frame (length = 512) as Noise Estimat...
Re: Dither
inA good article to understand dithering--- http://en.wikipedia.org/wiki/Dithering > > Hello All, > > I have a strange but basic...
A good article to understand dithering--- http://en.wikipedia.org/wiki/Dithering > > Hello All, > > I have a strange but basic query . I am not able to understand > the role played by dither while encoding the audio i.e. transform > coefficients which are quite signals because as we see in encoders > like AC-3 where in if the singal has low amplitudes then it is like > encoded with dit
MPEG4 decoder testing
inHi all I am working on the MPEG4 AAC decoder . I have xxx.mp4 test vectors but the decoder I have accepts only ADIF , ADTS formats. So...
Hi all I am working on the MPEG4 AAC decoder . I have xxx.mp4 test vectors but the decoder I have accepts only ADIF , ADTS formats. So I am unable to do the testing, can some one let me know how do I test the decoder. If we need to convert the xx.mp4 files to adts of adif to test where do I find the utility for the same. Were do I get an rms calculating utility for this codec an...
ASF source code
inHi all, Can anyone help me getting the source code ( In C ) for ASF Parser. I tried googling but couldn't get anything. Thanks in...
Hi all, Can anyone help me getting the source code ( In C ) for ASF Parser. I tried googling but couldn't get anything. Thanks in advance regards Gomathi
ASF container format
Hi all, I am working on ASF container format & not getting how the extra codec specific data is calculated for different codecs included in ASF...
Hi all, I am working on ASF container format & not getting how the extra codec specific data is calculated for different codecs included in ASF file. I have included below the 18 bytes of WAVEFORMATEX header which is padded with 22 bytes of extra type specific data. Microsofts msdn library specifies this structures at http://msdn2.microsoft.com/en-us/library/ms790436.aspx the structure...
Noise is getting detected as DTMF Tones.
inDear All, I've designed a digital DTMF detector in an FPGA, using a LPF, HPF and 8 Goertzel Filters.An AGC has also been designed which...
Dear All, I've designed a digital DTMF detector in an FPGA, using a LPF, HPF and 8 Goertzel Filters.An AGC has also been designed which limits the upper thresholds to -3dB and lower to about -30 dB.The DTMF tones from the telephone is exactly getting detected.I am facing a problem when just air is blown through the telephone receiver a random DTMF tones are continously getting detected.I trie...
Voice presence or absence detection
inI have an application that samples about 30 seconds of audio, 16 bit, 22050 samples per second. I would like to determine if there is a human...
I have an application that samples about 30 seconds of audio, 16 bit, 22050 samples per second. I would like to determine if there is a human voice signal present or not. With my limited knowledge, I would remove a DC offset on the entire signal, compute a 512 point FFT in a window that slides over the data. I would then check to see if the frequencies present correspond to those found i...
Adaptive Noice Cancellation - Two Microphone Recordings
Hi all, Iam working on Adaptive noise cancellation using LMS filter in Wavelet Domain. i have completed all the coding required for the project....
Hi all, Iam working on Adaptive noise cancellation using LMS filter in Wavelet Domain. i have completed all the coding required for the project. Iam using a Two microphone system, where the primary Mic picks up the Noisy speech and the second mic picks up only the background noise. I have one two microphone recording with me and I have tested my code on it and its working. The problem is that I n...
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