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| | Signal (information theory) - Wikipedia, the free encyclopedia |
 | | CDs contain discrete signals representing sound, recorded at 44,100 samples per second. | | | As a result, the values of such a signal are restricted to belong to a finite set; in other words, it is quantized. | | | The two main types of signals are analog and digital. |
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http://en.wikipedia.org/wiki/Signal_(information_theory)
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| | Signal Classifications and Properties |
| | In contrast to this, a discrete-time signal is often created by using the sampling theorem to sample a continuous signal, so it will only have values at equally spaced intervals along the time axis. | | | An easy example of a digital signal is a binary sequence, where the values of the function can only be one or zero. | | | Along with the classification of signals below, it is also important to understand the Classification of Systems. |
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http://cnx.rice.edu/content/m10057/latest
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| | Digital signal processing - Wikipedia, the free encyclopedia |
| | In order to properly sample an analog signal the Nyquist-Shannon sampling theorem must be satisfied. | | | In order to use an analog signal on a computer it must be digitized with an analog to digital converter (ADC). | | | The output of an FIR filter to any given input may be calculated by convolving the input signal with the impulse response. |
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http://en.wikipedia.org/wiki/Digital_signal_processing
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| | Introduction to Signal Processing |
| | Chapter 4 focuses on FIR filters and its purpose is to introduce two basic signal processing methods: block-by-block processing and sample-by-sample processing. | | | We put a lot of emphasis on the concept of sample processing algorithm, which is the repetitive series of computations that must be carried out on each input sample. | | | In the sample processing part, we introduce the basic building blocks of filters: adders, multipliers, and delays. |
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http://www.ece.rutgers.edu/~orfanidi/intro2sp
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| | MIDI and Music Synthesis Tutorial |
| | The sample data is decompressed during playback to restore the dynamic range of the signal. | | | The signal-to-quantizing noise ratio for a digitally sampled signal is limited by sample word size (the number of bits per sample), and by the amplitude of the digitized signal. | | | There are a number of different algorithms used for interpolation between sample values. |
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http://www.midi.org/about-midi/tutorial/tutor.shtml
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| | Dannenberg, Roger, rbd@cs |
| | In theory, any sampled signal can be recovered with arbitrarily low error provided that the signal’s sample rate is higher than twice its highest frequency component. | | | If tables are constructed by summing sinusoids, then it costs much more to generate a table sample than to access the table. | | | Table 2 shows computation time per sample for 16 tables. |
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http://www.cs.cmu.edu/~rbd/papers/tlu98/tlu.html
(1648 words)
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| | Digital Signal Processor |
| | DSP systems are designed to sample incoming analog signals at fixed time intervals, it must be fast enough to accurately describe the signal, with enough resolution to keep the noise level low. | | | Basically, a DSPs is a high-speed single chip microprocessor or microcomputer designed to perform computer intensive digital signal processing tasks [9]. | | | This means that typical computer such as an IBM PC design for business and other general application are not optimized to handle digital signal processing algorithms, such as digital filtering and fourier analysis. |
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http://cda.mrs.umn.edu/~lopezdr/seminar/fall2000/Vue.htm
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| | Mac the Scope 4X 4.27 - VersionTracker |
| | Includes versatile, intuitive signal generator software and more. | | | This looks to be a professional-level signal analysis tool. | | | Real-time analysis; Offline analysis: AIFF or Sound Designer II files (any sample rate, number of bits per sample or number of channels). |
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http://www.versiontracker.com/dyn/moreinfo/mac/2523
(3562 words)
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| | Integrating High-Quality Audio into Mobile Design |
| | FM synthesis uses a purely algorithmic technique of modulating a carrier signal with a modulator. | | | Assuming that instruction and read-write data are already cached, enabling cache for sample data may nearly double the performance. | | | While sample data is not very susceptible to cache pollution, it does contribute to it, as sample data is typically used once or twice in a loop and then it may be many more iterations before it is used again. |
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http://www.commsdesign.com/printableArticle?articleID=159904479
(3032 words)
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| | NetSound ICMC96 Paper |
| | As with the synthesis algorithms, these can be combined to form composite signal processing units of arbitrary complexity. | | | The resulting audio sample data is not stored or transmitted, only the descriptions and the necessary sampled sounds or synthesis data are stored and transmitted by the network server. | | | In contrast, NetSound exploits a suite of synthesis algorithms comprising the most widely-used sound synthesis techniques from the field of computer music as well as wavetable synthesis; including user-definable wavetables. |
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http://alumni.media.mit.edu/~mkc/icmc96/icmc96.html
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| | Telephony Terms |
| | Such quantizer give a signal to noise ratio which is almost constant over a wide range of input levels, and at a rate of eight bits/sample (or 64 kbits/s) give a reconstructed signal which is almost indistinguishable from the original. | | | Pulse signaling has been widely replaced by DTMF signaling in the USA, but is still in wide use in many countries of the world. | | | CT: Computer Telephony is a term which describes the industry that concerns itself with applying computer electronic data processing and transaction services to telecommunications devices and systems, especially switches and phones. |
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http://pcexpress.kewlhair.com/TheToolBag/InformationGrabBag/TelephonyTerms.htm
(12358 words)
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| | Silence.doc |
| | The code runs more slowly }{\f0\insrsid7214392 because}{\f0\insrsid16187607 (a) more function calls are executed for each sample frame, and (b) as a result of moving from function to function more often, more memory must be moved }{\f0\insrsid5072037 in}{\f0\insrsid16187607 and out of the }{\f0\insrsid5072037 processor\rquote s }{\f0\insrsid16187607 cache. | | | This causes the unit to read its i n put sample frame, compute a result, and add it back into the input sample frame. | | | Since the output of the Nth unit in the tick list is the input of the N + 1th unit, this has the effect of propagating the signal down through the tick list. |
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http://www.csounds.com/gogins/silence/Silence.doc
(4932 words)
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| | Signal 102 - Fire Fighter I/II Study Helper Compact Disc |
| | Signal 102 - Fire Fighter I/II Study Helper Compact Disc | | | Signal 102 will give you the definition for that word. | | | Signal 102 is a Flashcard\Multiple-Choice Test for Fire Fighters based on the 4th Edition of IFSTA Essentials Manual Of Fire Fighting. |
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http://www.911hotjobs.com/bookstore/pn270.htm
(4932 words)
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| | Red-Light |
| | A recent development in triggering makes use of a PC to create virtual loops using software, signal processors, and a video camera. | | | One such device is the Model ILA-550 Inductive Loop Analyzer from Detector Systems which can measure leakage resistance, frequency, and relative signal strength, loop inductance, resistance, and change in inductance. | | | The Trident/ Charleston area was selected because it had a documented crash problem at intersections with signals; the traffic signal system was not the cause of this problem; the business community was a strong supporter of various traffic safety initiatives; and the local enforcement agencies demonstrated a willingness to enforce RLR violations. |
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http://www.photocop.com/red-light.htm
(4932 words)
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| | Home Entertainment - DirecTV Subscription |
| | Connect your DirecTV satellite receiver to you computer. Change channels, check signal strength, navigate the menus and more. Great for those who watch TV on the computer. | | | Subscription based online lessons and activities designed for ages 7 to 11. Includes school and home subscription zones, sample lessons and activities and free trial for teachers. | | | Access to tables of contents and abstracts, instructions for authors, related web links, subscription information. Subscription is required to access full-text content. |
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http://www.digitalhomepicks.com/directvsubscription
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| | Frost - Digital Signal Processor |
| | Here is a sample of the available digital signal processor (DSP) devices. | | | Providing all in-line audio processing between mixers and amplifiers, the P4800 delivers the power and flexibility of high-end DSP devices in a package optimized for small to medium-sized installed audio systems. | | | Via matrix it is possible to assign the outputs to any input or to the sum of the inputs. |
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http://www.jfrost.com/ent-tech/sales/sound/processing/digital_signal_processor.htm
(574 words)
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| | Forward Error Correcting Codes |
| | Three functions are currently provided: a dot product useful for FIR filtering and correlation; a sum-of-squares routine useful for signal energy measurement, and a peak sample detector useful for automatic gain control. | | | This package provides several accelerated primitives useful in digital signal processing (DSP) that take advantage of the Intel/AMD SIMD instruction sets (MMX, SSE and SSE2). | | | I've written software to implement various error correcting codes, including the Reed-Solomon block codes and the Viterbi and Fano algorithms for decoding convolutional error correcting codes. |
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http://www.ka9q.net/code/fec
(574 words)
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| | Mac the Scope |
| | Analyze sound files or use the Waavebox signal generator with iBook, Cube, 2001 model G4s (in case a third party sound input device is not present) | | | or analyze AIFF, Sound Designer II / interleaved binary files - again, not limited to audio frequencies - arbitrary (up to 2 GHz) sample rates and word sizes (8, 16, 24, 32 bits) - and up to 127 channels (16 bits or greater and up to 48 input / output channels for ASIO). | | | Professional quality signal analyzer, vector trace oscilloscope and 1/3 octave RTA - includes a spectrogram / sonogram display and a versatile, easy to use, precision waveform and signal generator |
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http://www.channld.com/mts.html
(574 words)
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| | The educational encyclopedia, DSP guide, digital signal processing |
| | Sample rate converting tutorial digital signal systems are based on taking samples from a real-time, continuous signal | | | DSP pages introduction to Digital Signal Processing (DSP), | | | Digital signal processing DSP tutorial, java applets included |
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http://users.telenet.be/educypedia/electronics/dsp.htm
(574 words)
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| | Simulink and the DSP Blockset (DSP Blockset) |
| | Because in these modes a discrete-time signal is defined between sample times, if you sample the signal with a rate or phase that is distinct from the signal's own rate and phase, you still measure meaningful values. | | | Simulink offers the ability to shift a signal's sample times by an arbitrary value, which is equivalent to shifting the signal's phase by a fractional sample period. | | | An example is the Sample time parameter in the Signal From Workspace block, which specifies the imported signal's sample period. |
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http://www.tau.ac.il/cc/pages/docs/matlab/help/toolbox/dspblks/dspi12.html
(969 words)
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| | Partial probe mapping - Patent 5973637 |
| | Partial probe mapping determines the offset to be applied to the background signal and combines the background signal for one portion of the probe and the sample TDR signal for another portion of the probe to calculate an initial boundary signal for use in determining the process variable in the vessel. | | | Partial probe mapping combines a portion of the field measured sample TDR signal with a portion of a background signal determined at the factory or in the field to generate an initial boundary signal for the entire length of the probe 18 without having to empty the vessel 14. | | | The partial probe map 340, which is a combination of portion A of the sample TDR signal 320 and portion B of the background signal 300 adjusted by the chosen adjustment factor, is stored for use as the initial boundary signal. |
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http://www.freepatentsonline.com/5973637.html
(9928 words)
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| | Simulink and the DSP Blockset (DSP Blockset) |
| | The time instants where the signal is defined are called the signal's sample times; traditionally, a discrete signal is considered to be undefined at points in time between these instants. | | | Because in these modes a discrete-time signal is defined between sample times, if you sample the signal with a rate or phase that is distinct from the signal's own rate and phase, you still measure meaningful values. | | | Simulink offers the ability to shift a signal's sample times by an arbitrary value, which is equivalent to shifting the signal's phase by a fractional sample period. |
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http://www.tau.ac.il/cc/pages/docs/matlab/help/toolbox/dspblks/dspi12.html
(969 words)
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| | Simulink and the DSP Blockset (DSP Blockset) |
| | The time instants where the signal is defined are called the signal's sample times; traditionally, a discrete signal is considered to be undefined at points in time between these instants. | | | Because in these modes a discrete-time signal is defined between sample times, if you sample the signal with a rate or phase that is distinct from the signal's own rate and phase, you still measure meaningful values. | | | Simulink offers the ability to shift a signal's sample times by an arbitrary value, which is equivalent to shifting the signal's phase by a fractional sample period. |
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http://www.tau.ac.il/cc/pages/docs/matlab/help/toolbox/dspblks/dspi12.html
(969 words)
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| | Adaptive feed-forward method and apparatus for amplifier noise reduction (US5148117) |
| | The cancellation signal is injected into a transmission line which carries the sample signal so that only an error signal remains which essentially consists of the noise distortion component of the amplifier output signal. | | | The interference canceller provides a cancellation signal essentially consisting of the signal component which is common to both the reference signal and the sample signal. | | | a second directional coupler, the amplifier output signal being provided to the second directional coupler, the second directional coupler having an output and generating thereon a sample signal having an amplified input signal component and a noise and distortion component corresponding to the amplifier output signal; |
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http://www.delphion.com/details?&pn10=US05148117
(454 words)
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| | Comfort noise generator for echo cancelers - Patent 5949888 |
| | A device for generating comfort noise according to claim 19 wherein said comparator is adapted to determine that a signal sample is not a background noise sample if a predetermined hangover period has not elapsed since near-end speech was transmitted on said channel and since far-end speech was transmitted on said channel. | | | A method for generating comfort noise according to claim 23 wherein said determining step comprises the step of determining that a signal sample is not a background noise sample if a predetermined hangover period has not elapsed since near-end speech was transmitted on said channel and since far-end speech was transmitted on said channel. | | | A device for generating comfort noise according to claim 19 wherein said comparator is adapted to determine that a signal sample is not a background noise sample if a far-end signal power is greater than a far-end signal power threshold. |
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http://www.freepatentsonline.com/5949888.html
(2812 words)
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| | Simulink and the DSP Blockset (DSP Blockset) |
| | In the model below, a signal with a sample period of 0.125 seconds is rebuffered from a frame size of 8 to a frame size of 16 with an overlap of 4. | | | In the model below, a signal with a sample period of 0.125 seconds is rebuffered from a frame size of 8 to a frame size of 16. | | | The sample period of the signal at the output of the Rebuffer block is no longer 0.125 seconds, but rather 0.0938 seconds (1.5/16). |
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http://www.tau.ac.il/cc/pages/docs/matlab/help/toolbox/dspblks/dspf15.html
(1974 words)
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| | Scanning line converting method for a television receiver and device thereof - US Patent 5442404 |
| | The inputting video signal Vi of the interlaced scanning system is delayed by the sample memory sections 102,103,104,105, and this delayed signal in sample value in accordance with the edge pattern is computed by the sample value computer 101. | | | A value of the pixel i to be finally interpolated obtained by PMED computing the pixel components a,b,c,d,e,f of the upper and lower scanning lines of the pixel position to be interpolated and a sample value g computed in accordance with the edge characteristic, and its computation is as follows. | | | A scanning line converting method for a video signal as defined in claim 1, wherein said peripheral pixel component is a pixel component of said horizontal direction wherein said horizontal average value is set to said center value. |
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http://www.patentstorm.us/patents/5442404.html
(4410 words)
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| | SP05Lab6 |
| | In the case of the sampled signal, it is interesting to overlay the original analog signal (in dotted lines) with the sampled signal (as a stem plot). | | | The sample instants of the interpolated signal are at exactly the same time as the sample instants of the signal that was sampled at 40 kHz. | | | Remember to include one plot showing the sampled signal in the time and frequency domains, a second plot comparing the output of the DAC to the original analog signal, and a statement comparing the output of the DAC with the original analog signal. |
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http://www.csee.wvu.edu/~iyerr/SP05Lab6.htm
(1294 words)
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