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Discussion Groups > Oversampling

Comp.dsp is a worldwide Usenet news group that is used to discuss various aspects of digital signal processing.

We found 346 threads matching "oversampling"

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Oversampling in communication systems
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Mas Bas - 2005-08-15 11:43:00
Hi all, I would like to know about the oversampling used in communication system. There are 2 technique which commonly used. 1. Using (N-1) zero padding, to get N factor oversampling and finally use a digital filter to filled up the zeros. 2. Repeat the sample (N-1) times to get N facto...Oversampling in communication systems

Oversampling
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George - 2007-12-20 18:47:00
What is the highest oversampling rate in commercial use on high fidelity (15 kHz) audio nowadays? I'm not looking for anything leading-edge or very pricey. Just commercially available ADCs that are premium priced but aren't extremely expensive. A few years ago I recall 8X oversampling wa...Oversampling

Re: Maximum useable oversampling rate10x analog signal bandwidth?
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steve - 2005-01-23 18:55:00
"I don't see where it says that higher sample rates reduce the bandwidth." Well the title for one, "Option: Reduce noise by oversampling (at expense of bandwidth)" And the first sentence too, also just type in a oversample rate and you will see it recompute the lower bandwidth and displ...Re: Maximum useable oversampling rate10x analog signal bandwidth?

Does oversampling bring diversity gain?
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Benjamin Jiajia - 2007-05-11 12:08:00
As oversampling produces several baud rate signal sequences (for example, oversampling by a factor of 2 produces two baud rate sequences with an offset of half baud duration), could these sequences be viewed as a kind of diversity? and what's its gain? _____________________________________ ...Does oversampling bring diversity gain?

Oversampling & moving-average-filter
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Rob - 2008-02-03 10:05:00
Hi, I've spent some time reading about oversampling and I think I understand the fundamentals. Oversample by some factor > desired bandwidth, decimate and increase ENOB (with certain assumptions about dithering, etc). My signal of interest is slowly varying (1-2 Hz), and I'm using a 10...Oversampling & moving-average-filter

Re: Oversampling in WCDMA receiver
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raghs - 2007-08-28 08:56:00
> In article , > "HSDPA-boy" wrote: > > | I see. Since you mention increased accuracy, are you assuming RRC > | filtering in the digital domain? > > Yes. > > > | Could you point me to some literature that discusses these matters? It > | would be interesting to see how the o...Re: Oversampling in WCDMA receiver

Using oversampling to enhance SAR ADC performance
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Myron Mychal - 2003-10-17 11:26:00
I'm working with the new 56F630x series of Motorola DSP's (with an onboard 12-bit ADC). My application could make good use of 14-bit data, so I planned on oversampling by a factor of 16 and filtering with decimation to get an extra 2 bits out of the ADC. I recently spoke with someone from Mot...Using oversampling to enhance SAR ADC performance

only I mixer instead of IQ mixer?
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mary1234567 - 2006-02-06 11:16:00
I have tested use only cos(2*pi*fmix*n/fs) to demodulate a BFSK input signal. And it worked. Question is how much worse will it be? Will it be 3dB worser? Can I compensate this by oversampling instead? For example will a double oversampling give 3dB more SNR. Any answer is welcome! /Mary ...only I mixer instead of IQ mixer?

Oversampling for noise reduction
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stevepierson - 2007-03-16 12:52:00
Hi, I've been reading quite a bit about oversampling and it's apparent use in noise reduction, but haven't been able to tie everything together. As I probably can't explain my exact question clearly, I'll give an example, I have a Analog Devices evaluation board with a 1MSPS A/D with CPU hooked...Oversampling for noise reduction

Effect of oversampling on Signal Band width
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Ali A Nasir - 2009-08-12 15:39:00
Can anyone tell that what is the effect of doing oversampling before pulse shaping on the transmission bandwidth? My concern is that as books describe that doing upsampling and then filtering results in reduction in the Bandwidth but at the same time if we view it from different angle, we are thr...Effect of oversampling on Signal Band width

Oversampling in an ADC to improve performance
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Jorge Rivas - 2010-01-06 12:33:00
Hi all, I have a communications system that is streaming analog data. On the receiver side, this data is converted by an ADC with an oversampling of 4 related to the conversion rate of the DAC on the transmitter. As it is a system under testing (with variable speed), we don't have a proper st...Oversampling in an ADC to improve performance

Effect of OverSampling
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pratik13 - 2006-06-21 08:57:00
I'm new to DSP and also this group. My question is "what can be the negative effect of Oversamling in terms of Destortion in original signal?". As in undersampling two spectrum are overlapped and we may not be able to get original signal.. is that any kind of effect in oversampling? ...Effect of OverSampling

Do we have to use null tones in OFDM modulation?
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phil - 2008-09-09 17:22:00
Hi there, I have a question on OFDM. As we know, most OFDM systems nowadays do not use all the available tones (subcarriers) for data modulation. Let us say we have 64 tones in total and we might end up with 48 data tones, 4 pilot tones, 3 DC tones and 9 null tones, which is kind of an typica...Do we have to use null tones in OFDM modulation?

Re: Is 44.1 KHz sample-rate enough to cover the entire human hearing range?
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Jerry Avins - 2008-05-04 09:19:00
Eric Jacobsen wrote: ... > You can always trade off sample rate for sample width, i.e., if you > want 12-bits of dynamic range, but your storage medium is eight bits, > crank up the sample rate. When you decimate (or reconstruct) for > playback you'll get your equivalent twelve bit...Re: Is 44.1 KHz sample-rate enough to cover the entire human hearing range?

Re: Over-sampling with TMS320LF2407A
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Yuri Tregubov - 2004-11-29 03:31:00
The proper way to perform such oversampling is to put a decimating lowpass filter just after your ADC. Because of the oversampling, noise will spread over _wider_ spectrum area and hence when you apply a lowpass filter you will get higher signal/noise ratio cutting out this (_wider_) noise. N...Re: Over-sampling with TMS320LF2407A

Zeropadding vs. Oversampling
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gabi - 2006-03-13 08:54:00
Hi, I've got a fundamental question. I have a signal (impulse response of a room, computed from the original signal and the recorded signal) and now I want to find out the maximum of that impulse response. This IR has to be interpolated somehow, right now it is done by oversampling, but I was ...Zeropadding vs. Oversampling

OFDM transmitter oversampling
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cocioc - 2006-10-19 07:57:00
Hello, I have a question regarding the OFDM transmitter. In order to reduce the burden on the reconstruction filters, oversampling is used before feeding the data to the DAC. Oversampling, however, creates images of the baseband signal. To remove these images, low pass filters are placed after...OFDM transmitter oversampling

Oversampling for discrete time input
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Richard_K - 2006-10-18 22:52:00
Hi, May I know how to perform oversampling for discrete time input in MATLAB? Thanks ...Oversampling for discrete time input

Oversampling technique need help...
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glias - 2011-09-29 06:47:00
Hello all, I have IR preamp with a gain of 64dB, the output noise is about 50mV peak to peak for a signal of 4V peak peak (max) and the bandwidth is 350kHz. I have a AD7626 (16 bits 10MSPS ADC) which is largly suffisient for my aplpication. I would want to know what would be the best method to f...Oversampling technique need help...

Re: ADC SNR testing using tone
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kaz - 2012-08-02 10:11:00
> Hi, > > > > 2)the effect of sampling frequency at ADC on SNR is ignored in the > original equation of 6.02n + 1.76 > > you can read this equation as follows: > For a full-scale sine wave signal, the predicted noise across the whole > bandwidth is 6.02n+1.76 dB below the power of the fu...Re: ADC SNR testing using tone

ADC Interpolation Gain
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pacman101 - 2011-02-24 11:39:00
Hello, I've been reading a lot about increasing ADC quantization gain through oversampling and then applying an interpolation filter. I understand that for every 4x oversampling you can increase the SNR by 6 dB or 1-Bit and that lowers the quantization noise floor. However, say my ADC is sa...ADC Interpolation Gain

oversampling
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CW - 2009-05-22 10:03:00
Assume i receive a signal and perform direct conversion from passband to baseband with a front end analog filter with bandwidth +/- B for my signal. In my ADC I sample at 2B and have a signal plus noise limited to the band +/-B with each noise sample assumed to be uncorrelated. If i instead dec...oversampling

Re: Effect of oversampling on SFDR
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Tim Wescott - 2013-04-15 15:50:00
On Mon, 15 Apr 2013 06:22:36 -0500, SRB wrote: > > Hi All > > > > My question relates to the effect of oversampling on the SFDR obtained > with > > an ADC. I understand that the SNR of an ADC, considered over a certain > > bandwidth of interest (BW), can be increased relative to the overal...Re: Effect of oversampling on SFDR

Oversampling algorithm for root raised cosine pulse shaping filter
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chowash - 2005-06-29 09:44:00
hello ! I am working on a design of a Root Raised Cosine Pulse Shaping Filter and my design of filter taps are on the basis of sampling frequency which is of 4 times the BB frequency. Now to use this filter in the Tx section, I need to oversample my input data by 4 times. I would like to have a s...Oversampling algorithm for root raised cosine pulse shaping filter

FFT Size calculation.
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2007-03-29 11:54:00
Hi, I have the following problem that I am trying to address. Lets say we take 64 numbers and apply FFT of size 64. Then we concatenate 100 of these 64 numbers, and perform D/A conversion. This signal is digitized at a rate other than the original sampling rate, say we have oversampling of 3/...FFT Size calculation.

oversampling in OFDM
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mishal81 - 2011-10-14 16:04:00
Hi All,, Plz help me for ofdm simulation. I have tried to simulate ofdm signal with 64 subcarriers, with an oversampling of factor 4 in frequency domain. Now I've got 256 QPSK symbols with zero paddings.I'm doing IFFT of 256 points. But I need to modulate my data on 64 subcarriers. then how would...oversampling in OFDM

Re: FM demodulation help needed
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Jerry Avins - 2003-10-09 14:33:00
Prasanna Kumar Ganta wrote: > How about... > > (1) Amplitude limiting the digitized FM signal. > (2) Passing them through a frequency discriminator ( a filter whose > transition band is linear and wide enough to span the delta F of the FM > signal) > > Now you have an AM signal....Re: FM demodulation help needed

Re: Bit gain when filtering and then downsampling?
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Jerry Avins - 2006-12-07 11:07:00
SL wrote: > Hello all > > > > I'm wondering about how many bits I can gain if I first sample a signal with > a sampling rate of fs and have N bits. And then I filter the signal to a > bandwidth of fc Hz. And then at last I down sample the signal with D. > > > > ex.) > ...Re: Bit gain when filtering and then downsampling?

Re: OFDM and oversampling
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Phil - 2006-05-24 13:47:00
When the samples go through the digital to analog converter (DAC), the spectrum is replicated periodically, as you should now. In order to remove (suppress) the spectral replicas, a reconstruction filter is required following the DAC. If there are no high frequency bins left empty to create a...Re: OFDM and oversampling

Re: Anti Aliasing of Arbitrary Waveforms
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Martin Eisenberg - 2008-10-20 17:06:00
Scott Gravenhorst wrote: > The technique as I am currently applying it does not completely > eliminate the effect. It becomes audible around 2000 Hz > fundamental. Below 2000 Hz, it's not audible (to me). I may be > able to extend that by adjusting the filter. At fundamental frequency...Re: Anti Aliasing of Arbitrary Waveforms

Re: Delta-sigma ADC question
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Rob Gaddi - 2005-04-12 11:33:00
Ville Voipio wrote: > > Actually, it would be more precise to talk about "oversampling" > converters, because that's what makes the difference. Not the > actual converter topology or modulator order. > > - Ville > Not exactly. The pole in the feedback loop of a delta-sigma conve...Re: Delta-sigma ADC question

Re: FM Demod question
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Clay S. Turner - 2005-08-03 12:19:00
"Tim Wescott" wrote in message news:11f1okk9m8sna1@corp.supernews.com... > > Clay > > I saw that after I posted the comment - the next observation is that it is > exact when you're taking the differential, but how exact is it when you're > approximating the differential with a dif...Re: FM Demod question

Re: Sample Rate conversion
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cocioc - 2006-10-19 17:46:00
Hi Fred, My application is an OFDM transmitter. The output of the IFFT needs to be oversampled by a factor of 4 (after adding the CP). I thought of doing the oversampling by interpolating (inserting "zeroes") and low pass filtering the output of the interpolator to remove the unwanted images. I d...Re: Sample Rate conversion

Re: how to use 6 bit ADC/DAC to gain 8 bit ADC/DAC performance?
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Randy Yates - 2004-12-29 06:05:00
"kiki" writes: > Hi all, > > Can anybody suggest some methods of gaining 8-bit ADC/DAC performance with 6 > bit only ADC/DAC? One can use oversampling, or oversampling along with noise-shaping. The latter technique is commonly called a delta-sigma (some say sigma-delta, but they'r...Re: how to use 6 bit ADC/DAC to gain 8 bit ADC/DAC performance?

Oversampling vs. nr. Bits
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galatisa - 2005-04-20 09:53:00
Hi, I'm sampling a signal with a 35 MHz BW at a rate of 100Msa/s and 12 bit. The nature of the signal is something like 100ns Peaks at about 2/3 of peak value. I need the integration over each signal(100ns) but due to the sampling rate I only get at about 4-10 samples of every signal, a number w...Oversampling vs. nr. Bits

Question related to Sigma-Delta Datasheets
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Kiran - 2007-06-12 19:48:00
Hi All, I am going to be selecting a specific sigma-delta converter for an application and am getting a bit confused on the terminology. I have read up on the theory and understand it. Looking at this datasheet: http://focus.ti.com/lit/ds/symlink/ads1251.pdf On the first page, it says 20...Question related to Sigma-Delta Datasheets

Re: Negative Group Delay ... again!
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westocl - 2008-03-10 08:43:00
> On 10 Mrz., 11:05, Rune Allnor wrote: > > On Mar 10, 9:40=A0am, Andor wrote: > > > > > Rune Allnor wrote: > > > > A far more intersting question is whether a negative group > > > > delay is non-causal. > > > > > You seem to have comletely missed the whole point of the exe...Re: Negative Group Delay ... again!

Re: reconstruction filter
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Ian - 2006-01-12 06:49:00
"maxascent" wrote in message news:ZpSdnSyNJfpa11jeRVn-pg@giganews.com... > I am not using a Bessel filter, but an elliptic filter. I dont want to use > an dds ic as I am going to use an FPGA to do the DDS so I can generate > other waveforms and arbitrary waveforms. I will have to use a B...Re: reconstruction filter

Re: Tone Indentification
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Jerry Avins - 2005-11-23 20:18:00
Ron N. wrote: > Jerry Avins wrote: > > > vbbrett wrote: > > > > > Why does the 8 samples per cycle make the algoritm easier to implement? > > > How does the number of samples affect the output? Why can't I just > > > check 88 samples for a particular frequency? I'm afraid I don't > > ...Re: Tone Indentification

ADSL Demodulation
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DougB - 2012-05-18 09:58:00
Hello, In every book and article aobut ADSL processing the A/D and D/A sample rates are given as 2.208 MHz. For a transmitter implementation at this sample rate you would get the conjugate symmetric image spewing out of your D/A since one may use up to bin 255 and there is absolutely no oversamp...ADSL Demodulation
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