Patent ID: 8792653

Claim:
A signal processing apparatus, comprising: a first audio output unit configured to output audio based on a first audio signal input from a first signal input line; a first pickup unit, connected to the first signal input line, and configured to pick up ambient audio; a second audio output unit configured to output audio based on a second audio signal input from a second signal input line; a second pickup unit, connected to the second signal input line, and configured to pick up the ambient audio; a connecting line that connects the first audio output unit, the second audio output unit, the first pickup unit, and the second pickup unit to ground; and a first set of circuits configured to reduce one or more of: a first sound leakage signal using the first audio signal, wherein the first sound leakage signal is the first audio signal leaking into the second signal input line from the first audio output unit via the connecting line and the second pickup unit, or a second sound leakage signal using the second audio signal, wherein the second sound leakage signal is the second audio signal leaking into the second signal input line from the second audio output unit via the connecting line and the second pickup unit, wherein the first set of circuits are configured to reduce the first sound leakage signal by adding the first audio signal to the first sound leakage signal, wherein the first audio signal is attenuated based on a sound leakage ratio of the first audio signal leaking into the second pickup unit from the connecting line.