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US 8,577,065 B2Granted
Systems and methods for creating immersion surround sound and virtual speakers effects
AssigneeConexant Systems, Inc.
InventorHarry K Lau
Life of this patent
Estimating the term…
Abstract
Modern electronic devices are getting more portable and smaller leading to smaller distances between speakers. In particular, computers are now so compact that the notebook computer is one of the most popular computer types. However, with the proliferation of media available in digital form, both music recordings and video features, the demand for high quality reproductions on computers has increased. Systems and methods for producing wider speaker effects and immersion effects disclosed can enhance a listener's experience even in a notebook computer.
Claims20
An audio circuit for producing phantom speaker effects comprising:
- a left multiplier operable to multiply a left audio signal l(t) by a spread value s to generate a signal s*l(t);
- a left delay element operable to delay the spread left audio signal by a delay value Δt to generate a signal s*l(t−Δt);
- a right multiplier operable to multiply a right audio signal r(t) by the spread value s to generate a signal s*r(t);
- a right delay element operable to delay the spread right audio signal by the delay value Δt to generate a signal s*r(t−Δt);
- a first left mixer operable to subtract the right audio signal processed by the right multiplier and right delay element from the first left audio signal to generate a signal l(t)−s*r(t−Δt);
- a first right mixer operable to subtract the left audio signal processed by the left multiplier and left delay element from the right audio signal to generate a signal r(t)−s*l(t−Δt);
- a second left mixer operable to add the left audio signal processed by the left multiplier and left delay element to the first left mixed audio signal to generate a signal l(t)+s*l(t−Δt)−s*r(t−Δt);
- and
- a second right mixer operable to add the right audio signal processed by the right multiplier and right delay element to the first right mixed audio signal to generate a signal r(t)+s*r(t−Δt)−s*l(t−Δt).
6 more elements
An audio circuit for creating a 3D immersion effect comprising:
- a left crossover filter operable to separate a left audio signal into a left low frequency component signal lb(t) and a left high frequency component signal lt(t);
- a right crossover filter operable to separate a right audio signal into a right low frequency component signal rb(t) and a right high frequency component signal rb(t);
- a left multiplier operable to scale the left high frequency component signal lr(t) by a spread value s to produce a scaled left high frequency component signal s*lt(t);
- a right multiplier operable to scale the right high frequency component signal rt(t) by the spread value s to produce a scaled right high frequency component signal s*rt(t);
- a first left mixer operable to add the scaled right high frequency component signal to the left high frequency component signal to generate a signal lt(t)+s*rt(t);
- a second left mixer operable to add the left low frequency component lb(t) to the left high frequency component signal received from the first left mixer lt(t)+s*rt(t) to generate a signal lb(t)+lt(t)+s*rt(t);
- a first right mixer operable to add the scaled left high frequency component signal s*lt(t) to the right high frequency component signal rt(t) to generate a signal rt(t)+s*lt(t);
- a phase inverter-operable to phase invert the right high frequency component signal received from the first right mixer to generate a signal −rt(t)−s*lt(t);
- and
- a second right mixer operable to add the right low frequency component to the right high frequency component signal received from the phase inverter to generate a signal rb(t)−rt(t)−s*lt(t).
7 more elements
A method for producing phantom speaker effects comprising:
- producing a processed left channel signal l(t) comprising:
- scaling a left channel signal by a spread value s to generate a signal s*l(t);
- and
- delaying the left channel signal by a predetermined time Δt to generate a signal s*l(t−Δt);
- producing a processed right channel signal r(t) comprising:
- scaling a right channel signal by the spread value s to generate a signal s*r(t);
- and
- delaying the right channel signal by the predetermined time Δt to generate a signal s*r(t−Δt);
- subtracting the processed right channel signal from the left channel signal to generate a left mixed signal l(t)−s*r(t−Δt);
- subtracting the processed left channel signal from the right channel signal to generate a right mixed signal r(t)−s*l(t−Δt);
- adding the processed left channel signal to the left mixed signal to generate a signal l(t)+s*l(t−Δt)−s*r(t−Δt);
- and
- adding the processed right channel signal to the right mixed signal to generate a signal r(t)+s*r(t−Δt)−s*l(t−Δt).
10 more elements
A method of creating 3D immersion effect in a sound system comprising:
- separating a left channel signal into a left low frequency component signal and a left high frequency component signal;
- separating a right channel signal into a right low frequency component signal and a right high frequency component signal;
- scaling the left high frequency component signal by a spread value to produce a scaled left high frequency component signal;
- scaling the right high frequency component signal by the spread value to produce a scaled right high frequency component signal;
- adding the left low frequency component signal, the left high frequency component signal and the scaled right high frequency component signal;
- and
- subtracting from the right low frequency components signal, both the right high frequency component signal and the scaled left high frequency component signal.
4 more elements
Dependencies are inferred from the claim text.