Patent ID: 8577065

Claim:
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).