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Topic: Matrix decoder

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	Variable matrix decoder - US Patent 4799260
		The decoder generates a first control signal substantially proportional to the logarithm of the ratio of the amplitudes of two of the channel signals to detect, as between two of the channel signals, whether the amplitude of one signal dominates that of the other.
		The decoder also generates a second control signal substantially proportional to the logarithm of the ratio of the amplitudes of the sum and the difference between two of the channel signals to detect the dominant signal in terms of amplitude.
		The decoder includes a matrix means responsive to the two or more channel signals and the two control signals for generating a number of output signals according to an algorithm.
	www.patentstorm.us /patents/4799260.html (320 words)

	LDPC Decoder :: Blocks (Communications Blockset)
		This block implements the message-passing algorithm for decoding low-density parity-check (LDPC) codes, which are linear error control codes with sparse parity-check matrices and long block lengths that can attain performance near the Shannon limit.
		Decode generic binary LDPC codes where no patterns in the parity-check matrix are assumed.
		(n – k) and n are the number of rows and columns, respectively, in the parity-check matrix.
	www.mathworks.com /access/helpdesk/help/toolbox/commblks/ref/ldpcdecoder.html (373 words)

	Sound Blaster Entertainment: DTS-Extended Surround
		The main feature of this format is that because the SL, SR and Rear channels are fully independent, the sound can be designed with total freedom and it is possible to achieve a sense that the acoustic images are moving about freely among the background sounds surrounding the listener from 360 degrees.
		With this format, the additional SB channel signals undergo matrix encoding and are input to the SL and SR channels beforehand.
		The performance of the encoder used at the time of recording can be fully matched using a high precision digital matrix decoder developed by DTS, thereby achieving surround sound more faithful to the producer's sound design aims than with conventional 5.1 or 6.1-channel systems.
	www.soundblaster.com /Applications/article.asp?articleID=53912 (653 words)

	Dolby Pro Logic IIx
		While Dolby's Cinema Matrix system, Dolby Stereo, and the consumer equivalent, Dolby Pro Logic, are not the only Matrix Surround Sound systems in the world, but they are arguably the best as evidenced by their commercial success.
		The Pro Logic matrix decoding technology is used on the two surround channels, turning them into three: Left Surround, Center Surround, and Right Surround.
		This is the same principal as Dolby Digital EX, and in fact the same source track as a Dolby Digital EX soundtrack, only at decode time it uses DTS's own matrix technology to derive the trio of surround channels.
	www.hometheaterhifi.com /volume_11_1/feature-prologic-iix-3-2004.html (1876 words)

	JavaScript Matrix Falling Decoder - The Code Project - JavaScript
		Essentially how the Falling Matrix code works is very simple, you can see the iterative process the development went through, if you download early versions of the code from PlanetSourceCode.
		The project started out simply as a code breaking simulation that Hollywood popularizes, the letters just sort of spin randomly until each letter locks in place, the first version I created this is all it did, but it did it in a very flexible way that allowed you to easily change the resulting message.
		At this time, I thought that it'd be nice to have this effect multiple times on the page, and now with ASP doing all the creation of the script, I could...except my JavaScript was using global (page level) variables, so this had to be fixed.
	www.codeproject.com /jscript/matrixdecoder.asp (536 words)

	Simple Surround Sound Decoder
		This surround-sound decoder is based on the "Hafler" principle, first discovered by David Hafler sometime in the early 1970s.
		The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup.
		This is normally used to delay the sound supplied to the rear speakers, and effectively makes the sound stage larger by making the rear speakers sound further away.
	sound.westhost.com /project18.htm (1803 words)

	Electronic Hobbyists Corner - Hafler Matrix Decoder
		The Hafler Matrix decoder I use takes an extra step and digitally delays the difference signal by up to 33ms, to ensure that the difference signal reaches the listener after the original stereo signal.
		The decoder also uses an active low pass filter to derive a LFE (Low Frequency Effects) or sub-woofer channel from the mono (L + R) signal, and provides inverted and true outputs for bridging a stereo amplifier.
		Below is a schematic for a very basic analog Hafler Matrix decoder with buffered L and R channels, centre (L + R) channel, difference channel (L - R), and L and R LFE (sub-woofer) channels.
	www.ehobbycorner.com /pages/pro_hifi_hafler.html (765 words)

	Read-only memory using complementary conductivity type insulated gate field effect transistors - Patent 4037217
		In a standby condition of the memory matrix, an interrogation signal (logic level 0) is applied thereto causing all the "killer" transistors and precharge transistors of the memory matrix to turn on at a standby logic level 0 output from all of the matrix columns.
		Transistor 26 constitutes an element of column k'-1 of the matrix of the memory, and its drain is connected to the drains of other transistors in that column, such as transistors 28 and 30, whose gates are connected, by means of transfer gates, to individual inverter outputs from the decoder 6.
		Line i of the decoder is precharged at logic "0" level by transistor 13 being made conductive by the application to its gate of the output logic level "1" from the inverter 10, 11.
	www.freepatentsonline.com /4037217.html (2238 words)

	Matrix decoder - Encyclopedia, History, Geography and Biography (Site not responding. Last check: )
		Matrix decoder is an audio technology where a finite number of discrete audio channels (eg.
		The channels are generally, but not always, arranged for decoding by an encoder, and decoded for playback by a decoder.
		The notation for matrix encoding consists of the number of discrete audio channels separated by a colon from the number of decoded channels.
	www.arikah.com /encyclopedia/Matrix_decoder (278 words)

	5-2-5 matrix encoder and decoder system patent invention
		The decoding matrix includes frequency dependent circuitry that improves the balance between front and rear signals, provides smooth sound motion around a seven channel version of the system, and makes the sound of a five channel version closer to that of a seven channel version.
		The matrix elements vary to reduce the loudness of directionally encoded signals in outputs that are not involved in producing the intended direction, while enhancing the loudness of these signals in outputs that are involved in reproducing the intended direction, while at all times preserving the left/right separation of any simultaneously occurring input signals.
		In addition, these matrix elements may be designed to preserve the energy balance between the various components of the input signal, as much as possible, so that the balance between vocals and accompaniment is preserved in the decoder outputs.
	www.freshpatents.com /5-2-5-matrix-encoder-and-decoder-system-dt20061207ptan20060274900.php (1466 words)

	Multichannel matrix surround decoders for two-eared listeners (Site not responding. Last check: )
		Matrix equations for both a 5 channel and a 7 channel decoder are presented, along with an active and a passive encoder for 5 channel films.
		The matrix design for a signal steered to the rear hemisphere in the earlier decoder was developed heuristically and the separation between the rear outputs for steered material is not optimal.
		The standard film decoder does not boost the level to the rear speaker, and thus a standard film decoder (assuming it is well designed) does not increase the music level as a sound effect moves to the rear.
	world.std.com /~griesngr/SUR.html (8635 words)

	U.S. Patent: 5074558 - Matrix address decoder for pinball games - December 24, 1991
		The decoding operation performed by the matrix address decoder requires the transfer of only three bytes of information from the main microprocessor: a one-byte sequential identification number of the device for which information is sought and a two-byte starting memory address of the proper status information matrix.
		The eight-bit output from the decoder 32 (the mask byte) is passed to a mask buffer 34, where it may be read by the main processor 12 via bus 14.
		The mask byte output from the decoder 38 is passed to a second mask buffer 40, where it may be read by the main processor 12 via bus 14.
	www.everypatent.com /comp/pat5074558.html (3604 words)

	Virtual surround decoder apparatus patent invention
		A virtual surround decoder apparatus includes a matrix surround decoder which generates multi-channel source signals from 2-channel input source signals, a virtual surround decoder which generates the 2-channel virtual surround signals from the multi-channel source signals, and a level correcting unit which corrects the levels of the virtual surround signals.
		It is an object of this invention to improve S/N when the virtual surround decoding process is executed to multi-channel signals obtained by the matrix surround decoding process to generate the virtual surround signals, or when the virtual surround decoding process is executed to the monophonic signals and the stereo signals.
		The virtual surround decoder may be the stereo downmix processor of the Dolby headphones system, and the virtual surround signals may be the 2-channel surround headphone output signals for the headphone reproduction, for example.
	www.freshpatents.com /Virtual-surround-decoder-apparatus-dt20061123ptan20060262936.php (1310 words)

	[No title]
		Some hall-dependent delay may be added (by the playback decoder or processor) to the signal sent to the surround channel so that listeners far back in the theatre won't hear the surround signal (esp. simulated echo) prior to the original front channel sound.
		Depending on the decoder, other signal processing and channel amplitude manipulation (steering) may be applied to attempt to cancel various signals out of channels where they aren't "supposed" to be.
		In the same manner, I can decode surround > sound with the QS matrix decoder in the receiver, but sounds tend to > wander about the room and separation is not as good as in the theaters.
	www.access-one.com /rjn/laser/legacy/ld03.txt (6650 words)

	[No title]
		Some hall-dependent delay may be added (by the playback decoder or processor) to the signal sent to the surround channel so that listeners far back in the theatre won't hear the surround signal (esp. simulated echo) prior to the original front channel sound.
		Depending on the decoder, other signal processing and channel amplitude manipulation (steering) may be applied to attempt to cancel various signals out of channels where they aren't "supposed" to be.
		In the same manner, I can decode surround > sound with the QS matrix decoder in the receiver, but sounds tend to > wander about the room and separation is not as good as in the theaters.
	members.tripod.com /martin_leese/Audio/ld03.txt (6600 words)

	Math Forum - Ask Dr. Math (Site not responding. Last check: )
		Well, basically, we're multiplying the original matrix (I'll call it M) by an encoding matrix E and a decoding matrix D: MED Now since we carry out the multiplication in steps, this is how the grouping goes: (ME)D i.e., we're multiplying first by the encoder matrix, and then (second) by the decoder matrix.
		So when you're multiplying by the encoder matrix and then the decoder matrix, the net product is pretty much just multiplying your original matrix by 1 - it's going to the same as it was originally.
		We say that the decoder matrix is the inverse of the encoder matrix.
	mathforum.org /library/drmath/view/63725.html (547 words)

	TagTreeDecoder
		The decoding procedure 'update()' updates a value of the matrix from a stream of coded data, given a threshold.
		This procedure decodes enough information to identify whether or not the value is greater than or equal to the threshold, and updates the value accordingly.
		The information that can be decoded is whether or not the value of the element is greater than, or equal to, the value of the threshold.
	www.jpeg.org /jpeg2000guide/software/jj2000/jj2000-5.1-Doc/doc/jj2000/j2k/codestream/reader/TagTreeDecoder.html (460 words)

	Binary Linear Decoder (Communications Blockset) (Site not responding. Last check: )
		The Binary Linear Decoder block recovers a binary message vector from a binary codeword vector of a linear block code.
		The Generator matrix parameter is the generator matrix for the block code.
		The rth row of this matrix is the correction vector for a received binary codeword whose syndrome has decimal integer value r-1.
	www.technion.ac.il /guides/matlab/toolbox/commblks/ref/binarylineardecoder.html (222 words)

	Using the Libraries (Using the Communications Blockset)
		Decoding the code requires the generator matrix and possibly a truth table.
		A decoding table tells a decoder how to correct errors that might have corrupted the code during transmission.
		The Binary Cyclic Encoder and Binary Cyclic Decoder blocks allow you to specify a generator polynomial as the second mask parameter, instead of specifying K there.
	www.technion.ac.il /guides/matlab/toolbox/commblks/usersguide/tutor132.html (1110 words)

	CINEMA DSP [ 3 ]
		A matrix encoder is used to encode the left and right surround signals with the rear center channel, after which encoding is done by the Dolby Digital or DTS encoders.
		If the DVD disc was created using the 6.1 channel matrix encoding process, 6.1 channels of sound will be reproduced upon playback, provided that there is a matrix decoder in the rear channels and a sixth channel of amplification.
		The audio signal is first decoded to 5.1 channels, then the rear center channel is derived from the left and right channels by the matrix decoder.
	www.yamaha.co.jp /english/product/av/guide/technologies/cinema_dsp_3.html (351 words)

	Home Page
		The default matrix is given in Figure 15, and if the encoder decides it is warranted, it may substitute a new quantization matrix at a picture level and download it to the decoder via the bitstream.
		Because the quantizer matrix may be changed on a picture basis and the quantizer scale may be changed on a macroblock basis, these parameters are commonly used by encoder rate control algorithms to provide dynamic control over the relative buffer fullness.
		To decode a bitstream generated from the encoder of Figure 1, it is necessary to reverse the order of the encoder processing.
	www.siggraph.org /education/materials/HyperGraph/video/mpeg/index.htm (6018 words)

	Quadraphonic Discography - How to Play Quad Recordings
		I never have the heart to tell them that the decoder in their receiver only produces anywhere from 3db to 15db of separation between channels, which does not create a very spatial effect were one can clearly say where the sound originates from.
		Some of the decoders, either separate or in a receiver, built in the late '70's or early '80's could achieve as much as 50db of separation between channels, and are fairly quite in regards to noise.
		While the decoders in new receivers are different than the ones in the days of old, they still are pretty close.
	members.cox.net /surround/quaddisc/quadplay.htm (1757 words)

	Multichannel film today
		In its struggle to get it right, Dolby implemented several matrix encode/decode processes in the early years of the format and settled on a combination of technologies called variable matrix decoding and equal sound power.
		In the variable matrix scheme, a different decoding matrix is switched into the listening path based on the dominance of either left, center, right or surround signals.
		Each decoding matrix is designed to maintain sound power in the listening environment; when it is steering, the matrix decoder has the least perceptible effect on the total energy in the sound field.
	svconline.com /mag/avinstall_multichannel_film_today (3703 words)

	Taurus Laboratory - Lab Report - Design and Implementation of A Keypad Matrix Decoder (Site not responding. Last check: )
		This part is used to decode any pair of Ri and Cj to a corresponding 4-bit binary number ABCD (also a HEX number).
		The HEX number from the matrix decoder can be decoded to the corresponding signals for one seven-segment display.
		This report will not describe the design and implementation of the hex to seven segment decoder, as it is done in the previous laboratory experiment.
	www.tauruslab.org /products/lab_reports/sc201/p02.php (409 words)

	surround sound decoder (Site not responding. Last check: )
		Designed with DTSÂ®-ES and DolbyÂ® Digital EX processing, Decoder DDTS-100 is capable of decoding up to 6.1-channel audio to deliver a superior digital surround sound theater experience.
		This surround-sound decoder is based on the "Hafler" principle, first discovered by...
		be monopole, equidistant to the listener, and all delay (ms) calculations on the surround decoder...
	www.einehandvollgras.de /615-surround-sound-decoder.html (301 words)

	[No title]
		The decoder is similarly equipped with a rematrix, which tracks the encoder rematrix and restores the groups to the form required by the unmodified 2:4 matrix decoder.
		The choice of whether the matrix output groups or the sum and difference of the matrix output groups are selected is based on a determination of which results in fewer undesirable artifacts when the output latticed data sets are recovered in the decoder.
		The apparatus of claim 9 or 11 wherein said means for dividing the matrix output groups into square components includes means for dividing the matrix output groups into time blocks and means for applying a transform to each of said blocks to produce a set of transform square coefficients.
	www.bricklin.com /speeches/onscreenbusdocs/Resource-36/id53_m.htm (979 words)

	Transcoding Quad Recordings to Ambisonics
		You will need to locate a matrix decoder which handles the system with which your source material was encoded.
		Set up the quad matrix decoder to decode the matrixed 2-channel source material and feed the four line level signals to the Transcoder inputs as described above.
		In addition, of course, remember that a UHJ decoder does a very good job of decoding matrixed quad signals, and the lack of logic decoding dramatically improves image stability on Dolby surround soundtracks.
	www.ambisonic.net /quaduhj.html (930 words)

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