60 GHZ uncompressed transmission

Started by fawzy in comp.dsp10 years ago 9 replies

Dear Sir; A new technique in a multimedia transmission is transmitting a video without compression on 60 GHZ unlicensed band. It uses image...

Dear Sir; A new technique in a multimedia transmission is transmitting a video without compression on 60 GHZ unlicensed band. It uses image partitioning. I need some information about this image partitioning. Regards Eng. Fawzy


Reference Video Clips for Video Compression Testing?

Started by Randy Yates in comp.dsp14 years ago 1 reply

Hi Folks, Are there any raw video clips (YUV 4:2:2, preferably) that are known stressors on video encoders (e.g., MPEG-4 ASP, H.264, etc.)?...

Hi Folks, Are there any raw video clips (YUV 4:2:2, preferably) that are known stressors on video encoders (e.g., MPEG-4 ASP, H.264, etc.)? Is there a standard set of clips used for verification of video codecs? --Randy


high quality results with LPC?

Started by igor b. in comp.dsp10 years ago 7 replies

Is it possible to get high quality results using linear prediction for voice modeling (singing voice, to be more specific) assuming we have...

Is it possible to get high quality results using linear prediction for voice modeling (singing voice, to be more specific) assuming we have enough processing power, bandwith and other stuff? All papers I've found focus on compression.


video format .bix .box

Started by SpringTime in comp.dsp13 years ago

There is video format with file extension .bix .box . It was mainly used for surveillance systems. Does anyone know about its compression,...

There is video format with file extension .bix .box . It was mainly used for surveillance systems. Does anyone know about its compression, player/viewer and about enhancing it? Thanks, ST


image enhancement through dynamic range compression and contrast enhancement

Started by 4N in comp.dsp12 years ago

Hi, I've read in my old textbook that using omomorphic filtering + a slightly modified gaussian highpass filter I can enhance the visibility...

Hi, I've read in my old textbook that using omomorphic filtering + a slightly modified gaussian highpass filter I can enhance the visibility of images, but when I tryed I simply obtained a darker image, which makes sense since the dc is the value reduced the most. Does someone know how this filter works? Thanks.


Question

Started by johny in comp.dsp16 years ago 11 replies

Hi, Sorry to bother you with such an uneducated question, well... I have looked into some live performance audio gear, and it uses a DSP and...

Hi, Sorry to bother you with such an uneducated question, well... I have looked into some live performance audio gear, and it uses a DSP and a 24bit 192Khz DAC ADC. But each DSP "Box" usually does only one thing - one effect or compression/limiter or feedback cancelation etc' - and cost about 130$US. So I was thinking to myself why cant the box do all of the above. Is the DSP too weak...


MPEG mistake

Started by glen herrmannsfeldt in comp.dsp8 years ago 3 replies

While posting to the DCT vs. FFT discussion, I was reminded of some thoughts related to MPEG and video compression. It seems to me that one...

While posting to the DCT vs. FFT discussion, I was reminded of some thoughts related to MPEG and video compression. It seems to me that one case that MPEG doesn't do well is rapid changes in overall illumination. Specifically, the case where many flash photographs are being taken in a short time. That causes little problem with analog video, where frames are independent of each other. ...


Amplitude compression

Started by Richard Owlett in comp.dsp11 years ago 11 replies

I'm plotting a time series of fft's, similar to spectrograms but in 3D. If I use a linear scale I clearly see details of primary signal. But If...

I'm plotting a time series of fft's, similar to spectrograms but in 3D. If I use a linear scale I clearly see details of primary signal. But If I use a log scale I can now see the existence of much smaller features but at the expense of losing detail of the larger features. Are there any common methods for dealing with this problem? As I'm looking at only the magnitude of the fft, my dat...


calculating MIPS in a application

Started by mia in comp.dsp16 years ago 4 replies

hi all, i want to know as to how a product engg calcuates MIPS in a application.well we have a algorithm(image compression) which we...

hi all, i want to know as to how a product engg calcuates MIPS in a application.well we have a algorithm(image compression) which we plan to implement it in a dsp processor.in the process of choosing the processor,the main criteria which is been asked is ...whats the MIPS of ur application???? how can one calculate that..??? thanks miadsp


Theora vs. M-JPEG2000

Started by Jaime Andres Aranguren Cardona in comp.dsp12 years ago 1 reply

Hello, Talking about video codecs, specifically Theora (www.theora.org) and M-JPEG2000, how do they compare in terms of compression ratio for...

Hello, Talking about video codecs, specifically Theora (www.theora.org) and M-JPEG2000, how do they compare in terms of compression ratio for a given quality? Being M-JPEG2000 based on still pictures and not taking advantage of interframe redundancies (from the very few I have read so far), is it viable for networking and storage applications? Kindest regards, JaaC -- Posted v...


Applying Dynamic Range Compression to a PCM stream?

Started by Rich Fife in comp.dsp13 years ago 1 reply

Does anyone have a functioning example of how to apply DRC to a PCM stream on the fly? This is the stuff you might see on your stereo labeled...

Does anyone have a functioning example of how to apply DRC to a PCM stream on the fly? This is the stuff you might see on your stereo labeled "Night Mode" that reduces peak volumes while leaving passages that are at normal volume alone. I can kind of wing it, but I'd like to do it right (When should I be in log scale and when in linear?) and I can't find any good documentation online. C ...


WAV to MP3 conversion -- introductory material needed

Started by Richard Owlett in comp.dsp11 years ago 7 replies

My church has decided to make sermons available on the web. They are posting versions for high speed and dialup connections(both are mp3)....

My church has decided to make sermons available on the web. They are posting versions for high speed and dialup connections(both are mp3). They are not particularly happy with the listenability of the low speed version. I don't find it too bad, but some on the committee are trained musicians. The compression program was one someone had available. It's quite possible the problem lays m...


A better window than hanning

Started by thedude in comp.dsp15 years ago 6 replies

Hi Im working with DSP for a school project. We have made a sound compression program for wav files. We uses a hanning window and makes...

Hi Im working with DSP for a school project. We have made a sound compression program for wav files. We uses a hanning window and makes 50% overlap on our sound samples, before we use out fft. Is there a window that uses less overlap with the same result?


FFT of a video? (Caterpillars involved!)

Started by Alex Vaughan in comp.dsp14 years ago 1 reply

Hi, I'm trying to track the periodic movements of a caterpillar; in one behavior, it compresses its entire body regularly (period: 4s), and...

Hi, I'm trying to track the periodic movements of a caterpillar; in one behavior, it compresses its entire body regularly (period: 4s), and in another it has a peristaltic wave of compression that moves from tail to head (period:20 sec). I'd like to observe this by taking video, and doing a frequency analysis across time; the caterpillar itself doesn't move (much), so we're only looking...


Audio engineer

Started by John in comp.dsp15 years ago 7 replies

I am a software DSP engineer. I would like to consider a job as a DSP audio engineer. What type of algorithms I need to know ? I did some work in...

I am a software DSP engineer. I would like to consider a job as a DSP audio engineer. What type of algorithms I need to know ? I did some work in echo cancellation, and voice compression does this make me an audio engineer ? John


MELP speech compression

Started by karel bruneel in comp.dsp8 months ago 2 replies

Hi, Can someone pleas help me find the folowing article: "Analog to Digital Conversion of Voice by 2,400 Bit/second Mixed Excitation Linear...

Hi, Can someone pleas help me find the folowing article: "Analog to Digital Conversion of Voice by 2,400 Bit/second Mixed Excitation Linear Prediction (MELP)," Federal Information Processing Standards Publication (FIPS PUB) Draft, June 12, 1997 I?me just a poor student not able to pay 35$ for an article. Thank you Karel Bruneel


DSP Programmer needed

Started by Andy Hunter in comp.dsp8 years ago

We are looking for a DSP (digital sound processing) engineer with a background in music production who is interested in building basic effects...

We are looking for a DSP (digital sound processing) engineer with a background in music production who is interested in building basic effects scripts/plugins (including varieties of compression, limiting, volume normalization, delay, reverb, and signal processing like like phasing and autotune) for our proprietary audio platform. We are in Brooklyn, but we are open to someone who wants to ...


image compression

Started by gilbert in comp.dsp16 years ago 1 reply

This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C3A310.F0A4C400 Content-Type:...

This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C3A310.F0A4C400 Content-Type: text/plain; charset="big5" Content-Transfer-Encoding: quoted-printable hi,=20 I have a Cmos sensor (image sensor ), it has RGB output form. i want to compress those data, but i do not know how should i do. Is there anybody can tell me where can find these references? Gil...


Rate distortion plot how?

Started by A.E lover in comp.dsp12 years ago 2 replies

I need to test my compression program and what I need is to plot a rate-distortion figure Specifically my signal is f[n]=1 if...

I need to test my compression program and what I need is to plot a rate-distortion figure Specifically my signal is f[n]=1 if n=0,1,.....,12. and f[n]=0 otherwise. n is from 0 to 255. My algorithm decompose the signal to 256 coefficients and using M bits to encode each coefficient. (M can be changed) Now to plot the rate_distortion, I guess I will: 1. Let M = some various numbers ...


LPC for Analysis of 2 Speech Signals

Started by Raeldor in comp.dsp9 years ago 10 replies

Hi All, I am trying to find the best way to analyze 2 speech signals from 2 different speakers and come up with a 'match percentage' as to...

Hi All, I am trying to find the best way to analyze 2 speech signals from 2 different speakers and come up with a 'match percentage' as to how close they were (ie, did the speakers say the same thing). I have been reading that LPC is great for encoding the basic parameters of speech, but most of the articles are related to compression or building of a vocoder. Has anyone had experience ...