1
Shen Michael T: Single stage power amplifiers for multiple signal channels. Plevy Arthur L, December 3, 1974: US3852530 (147 worldwide citation)

There is disclosed apparatus for amplifying, for example, four separate stereo or audio information channels by means of a common power amplifier. Each audio channel is modulated on a respective carrier signal and then applied to a common amplifier which is of a wide-band circuit configuration.Certa ...


2
Harold Herman Trebes Jr: System and method for providing peer-oriented control of telecommunications services. R Steven Coursey, Troutman Sanders, November 13, 2001: US06317438 (140 worldwide citation)

In a telecommunications network environment including non-participating elements and participating elements, a method for providing a telecommunications service between a first peer element connected to the telecommunications network environment and a second peer element connected to the telecommuni ...


3
Hafler David: Two-channel, four-component stereophonic system. Dynaco, October 10, 1972: US3697692 (137 worldwide citation)

A two-channel stereo signal including left and right channel responses (L and R, respectively), deriving from only two amplifiers, is fed to four speakers located approximately at the corners of a quadriliateral area, and are positioned to face toward the interior of the area. The network drives the ...


4
Paul Gothard Knutson, Billy Wesley Beyers Jr, Kumar Ramaswamy, Thomas Anthony Stahl: Auxiliary data insertion in a transport datastream. Thomson Licensing, Joseph S Tripolis, Joseph J Laks, Ronald H Kurdyis, September 7, 2004: US06788710 (125 worldwide citation)

A digital device, such as a digital VTR, receives and records an MPEG compatible datastream. On play back, the DVTR inserts packetized auxiliary information, such as on-screen display information, into the transport datastream for transmission to another digital device, such as a television receiver ...


5
John Joyce, Eric J Freeman: Orientation-responsive acoustic driver selection. Bose Corporation, January 13, 2015: US08934647 (123 worldwide citation)

An audio device incorporates a first acoustic driver having a first direction of maximum acoustic radiation and a second acoustic driver having a second direction of maximum acoustic radiation, where the first and second directions of maximum acoustic radiation are not in parallel, and where the aud ...


6
Schuijers Erik G P, Oomen Arnoldus W J: Audio coding. Koninklijke Philips Electronics, Schuijers Erik G P, Oomen Arnoldus W J, GROENENDAAL Antonius W M, January 22, 2004: WO/2004/008806 (123 worldwide citation)

In binaural stereo coding, only one monaural channel is encoded. An additional layer holds the parameters to retrieve the left and right signal. An encoder is disclosed which links transient information extracted from the mono encoded signal to parametric multi-channel layers to provide increased pe ...


7
Jens Spille: Method for generating a multi-channel audio decoder matrix. Deutsche Thomson Brandt, Joseph S Tripoli, Eric P Herrmann, Ronald H Kurdyla, June 4, 1996: US05524054 (122 worldwide citation)

In an MPEG multi-channel audio signal processor, a decoder requires a respective decoder matrix for determining different output channels from coded audio data. Some transmitted information indicates basic parameters of the multi-channel system. This information may be used to address a currently re ...


8
Batke Johann Markus, Eilts Grimm Klaus, Schmidt Juergen: Audio signal, method and apparatus for encoding or transmitting the same and method and apparatus for processing the same. Thomson Ohg Deutsche, August 26, 2009: EP2094032-A1 (118 worldwide citation)

Commonly used audio file formats relate directly to the audio channels, i.e. the audio information is stored like it is fed to the loudspeaker. However, for obtaining a general description of audio information, a paradigm shift is necessary. Instead of storing the loudspeaker channels, a new audio f ...


9
Juergen Heinrich Herre: Enhanced joint stereo coding method using temporal envelope shaping. Lucent Technologies, Kenneth M Brown, September 22, 1998: US05812971 (115 worldwide citation)

A method and apparatus for performing joint stereo coding of multi-channel audio signals using intensity stereo coding techniques. In particular, predictive filtering techniques are applied to the spectral coefficient data, thereby preserving the time structure of the output signal of each channel, ...


10
Peter H Myers: Three-dimensional auditory display apparatus and method utilizing enhanced bionic emulation of human binaural sound localization. American Natural Sound Company, Philip M Shaw Jr, March 28, 1989: US04817149 (115 worldwide citation)

An artificial, three dimensional auditory display which artificially imparts localization cues to a multifrequency component electronic signal which corresponds to a sound source. The cues imparted are a front to back cue in the form of attenuation and boosting of certain frequency components of the ...