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Looking for some journals/reports on 'frequency shaping' and 'amplitude compression' for heaing aid

Started by wahe...@yahoo.com in Audio Signal Processing17 years ago 1 reply

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...

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

Started by je0062002 in Audio Signal Processing17 years ago 2 replies

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...

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

Started by khal...@yahoo.co.in in Audio Signal Processing17 years ago 1 reply

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...

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

Started by bada...@yahoo.com in Audio Signal Processing17 years ago 1 reply

A 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

Started by Mohan Reddy in Audio Signal Processing17 years ago 3 replies

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...

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

Started by R Gomathi in Audio Signal Processing17 years ago 2 replies

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...

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

Started by mano...@yahoo.com in Audio Signal Processing17 years ago

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.

Started by madh...@signal-networks.com in Audio Signal Processing17 years ago 1 reply

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...

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

Started by Peter Gien in Audio Signal Processing17 years ago 1 reply

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...

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

Started by Khalandar Pasha N in Audio Signal Processing17 years ago

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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