News Column

Patent Issued for Process for Removing Voice from Stereo Recordings

July 15, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Creative Technology Ltd (Singapore, SG) has been issued patent number 8767969, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Laroche, Jean (Santa Cruz, CA); Brown, Tyler (Thetford, VT); Peevers, Alan (Santa Cruz, CA); Sussman, Robert (Capitola, CA); Dolson, Mark (Ben Lomond, CA).

This patent was filed on September 27, 2000 and was published online on July 1, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "A consistent stream of technological developments has changed the way people listen to and enjoy audio and musical performances. For example, sound digitization has provided a way for large volumes of sound information to be stored on a small, light package known as a compact disk (CD). It is now possible for people to have home sound systems that rival even the best theater systems.

"FIG. 1 shows a top view of a listening room 100 containing typical music processing equipment including a music source 102, an amplifier 104 and four speakers 106. The music source 102 is a compact disc (CD) player, but could be another type of source, like a cassette tape player. The music source 102 couples to the amplifier 104 so that music received by the amplifier 104 can be amplified and transmitted over cables 108 to the speakers 106. A listener 110 is located approximately at the center of the listening room so that the four speakers are roughly the same distance away. The speakers are designated as front left (FL), front right (FR), rear left (RL), and rear right (RR).

"When music is played through the speakers it is possible for the listener 110, who is facing front, to perceive spatial positions relating to sound components within the music. For example, the listener 110 may perceive that a singer's voice 112 is directly in front of him. The listener may also perceive that the sound of a piano 114 is to his front and right, and that the sound of a guitar 116 is behind and to the left. Although FIG. 1 depicts the spatial position of musical instruments, it is also possible to perceive spatial positions for other sound generating objects. For example, spatial positions for the sound of an automobile engine or the sound of the ocean may also be perceived using the listening room 100 as show in FIG. 1.

"However, a significant problem exists in that the spatial positions and sound qualities of the sound components in a recording, such as on a CD, are determined when the recording is created. Thus, it may not be possible for the sound components of a sound signal to be associated with different spatial positions or sound qualities that may be more enjoyable to the listener."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The present invention provides a system for processing a sound signal that allows listeners to dynamically customize perceived spatial positions and sound qualities of sound components associated with the sound signal. For example, the listener may configure the system to reposition the perceived position of a singer's voice or may cause the perceived position of the singer's voice to dynamically change in accordance with a preprogrammed script. The listener may also use the system to automatically reposition the perceived spatial positions of the sound components based on events detected within the sound signal itself. For example, the detected beat of a drum may be used to changed the perceived spatial position of the singer's voice. It is also possible to use the system to change the sound qualities of the sound components as desired.

"One embodiment of the present invention includes apparatus for processing a a sound signal that comprises an input to receive the sound signal, a sound unmixer coupled to the input to receive the sound signal and unmix at least one sound stream from the sound signal based on at least one unmixing instruction, and an output coupled to the sound unmixer to output the at least one sound stream.

"Another embodiment of the present invention provides a method of processing a sound signal. The method comprising the steps of receiving the sound signal, unmixing at least one sound stream from the sound signal based on at least one unmixing instruction, and outputting the at least one sound stream.

"A further understanding of the nature and the advantages of the inventions disclosed herein may be realized by reference to the remaining portions of the specification and the attached drawings."

For the URL and additional information on this patent, see: Laroche, Jean; Brown, Tyler; Peevers, Alan; Sussman, Robert; Dolson, Mark. Process for Removing Voice from Stereo Recordings. U.S. Patent Number 8767969, filed September 27, 2000, and published online on July 1, 2014. Patent URL:

Keywords for this news article include: Creative Technology Ltd.

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Source: Journal of Technology

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