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US 6,608,902 B1Granted
Stereo signal separation circuit and application thereof
AssigneeSigmatel, Inc.
InventorsH. Spence Jackson, Mathew A. Rybicki, Giri Nk Rangan
Life of this patent
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Abstract
A stereo separation circuit includes a pair of amplifiers and a pair of divider circuits. Each of the amplifiers is coupled to receive a stereo signal (e.g., a left stereo signal or a right stereo signal) and the output of the other amplifier through a portion of one of the divider circuits. The other portion of the divider circuit is coupled as feedback across an amplifier. A ratio between the feedback portion of the divider circuit and the other portion of the divider circuit provides a separation ratio. The greater the separation ratio, the greater the perceived audio separation of the stereo signals.
Claims18
A stereo separation circuit comprises:
- a first amplifier having a first pair of inputs and a first output, wherein one of the first pair of inputs is operably coupled to receive a first stereo signal;
- a second amplifier having a second pair of inputs and a second output, wherein one of the second pair of inputs is operably coupled to receive a second stereo signal;
- a first divider circuit having a first beginning node, a first tap node, and a first ending node, wherein the first beginning node is operably coupled to the second output, the first tap node is operably coupled to another one of the first pair of inputs, and the first ending node is operably coupled to the first output;
- and
- a second divider circuit having a second beginning node, a second tap node, and a second ending node, wherein the second beginning node is operably coupled to the first output, the second tap node is operably coupled to another one of the second pair of inputs, and the second ending node is operably coupled to the second output.
2 more elements
The stereo separation circuit of 4, wherein the resistor divider network comprises a plurality of resistors and a plurality of switches to provide selectable separation ratios.
An audio codec comprises:
- an analog to digital converter section operably coupled to receive an analog input signal and to produce a digital representation thereof;
- a digital to analog converter operably coupled to receive a digitized analog signal and to produce an analog representation thereof;
- and
- a stereo separation circuit operably coupled to the digital to analog converter, wherein the stereo separation circuit includes:
- a first amplifier having a first pair of inputs and a first output, wherein one of the first pair of inputs is operably coupled to receive a first stereo signal of the analog representation;
- a second amplifier having a second pair of inputs and a second output, wherein one of the second pair of inputs is operably coupled to receive a second stereo signal of the analog representation;
- a first divider circuit having a first beginning node, a first tap node, and a first ending node, wherein the first beginning node is operably coupled to the second output, the first tap node is operably coupled to another one of the first pair of inputs, and the first ending node is operably coupled to the first output;
- and
- a second divider circuit having a second beginning node, a second tap node, and a second ending node, wherein the second beginning node is operably coupled to the first output, the second tap node is operably coupled to another one of the second pair of inputs, and the second ending node is operably coupled to the second output.
6 more elements
An audio processing circuit comprises:
- digital audio processing circuit that processes digitized audio;
- and
- an audio codec operably coupled to the digital audio processing circuit, wherein the audio codec includes:
- an analog to digital converter section operably coupled to receive an analog input signal and to produce a digital representation thereof;
- a digital to analog converter operably coupled to receive a digitized analog signal and to produce an analog representation thereof, and
- a stereo separation circuit operably coupled to the digital to analog converter, wherein the stereo separation circuit includes:
- a first amplifier having a first pair of inputs and a first output, wherein one of the first pair of inputs is operably coupled to receive a first stereo signal of the analog representation;
- a second amplifier having a second pair of inputs and a second output, wherein one of the second pair of inputs is operably coupled to receive a second stereo signal of the analog representation;
- a first divider circuit having a first beginning node, a first tap node, and a first ending node, wherein the first beginning node is operably coupled to the second output, the first tap node is operably coupled to another one of the first pair of inputs, and the first ending node is operably coupled to the first output;
- and
- a second divider circuit having a second beginning node, a second tap node, and a second ending node, wherein the second beginning node is operably coupled to the first output, the second tap node is operably coupled to another one of the second pair of inputs, and the second ending node is operably coupled to the second output.
8 more elements
A computer system comprises:
- a central processing unit;
- system memory operably coupled to the central processing unit;
- and
- an audio processing circuit operably coupled to the central processing unit and the system memory, wherein the audio processing circuit includes:
- digital audio processing circuit that processes digitized audio;
- and
- an audio codec operably coupled to the digital audio processing circuit, wherein the audio codec includes:
- an analog to digital converter section operably coupled to receive an analog input signal and to produce a digital representation thereof;
- a digital to analog converter operably coupled to receive a digitized analog signal and to produce an analog representation thereof;
- and
- a stereo separation circuit operably coupled to the digital to analog converter, wherein the stereo separation circuit includes:
- a first amplifier having a first pair of inputs and a first output, wherein one of the first pair of inputs is operably coupled to receive a first stereo signal of the analog representation;
- a second amplifier having a second pair of inputs and a second output, wherein one of the second pair of inputs is operably coupled to receive a second stereo signal of the analog representation;
- a first divider circuit having a first beginning node, a first tap node, and a first ending node, wherein the first beginning node is operably coupled to the second output, the first tap node is operably coupled to another one of the first pair of inputs, and the first ending node is operably coupled to the first output;
- and
- a second divider circuit having a second beginning node, a second tap node, and a second ending node, wherein the second beginning node is operably coupled to the first output, the second tap node is operably coupled to another one of the second pair of inputs, and the second ending node is operably coupled to the second output.
13 more elements
Dependencies are inferred from the claim text.