Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Reexamination Certificate
2004-12-03
2008-12-16
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Including frequency control
Having automatic equalizer circuit
C381S107000, C381S017000, C381S001000
Reexamination Certificate
active
07466831
ABSTRACT:
The present invention relates to audio signal processing such as equalisation and spatial enhancement functions. The present invention provides an audio signal processing circuit arrangement for two audio channels, and which combines spatial enhancement or acoustic mixing (crosstalk) cancelling with graphic equalisation functions. This is achieved with a circuit structure having a reduced filter count compared with known cascaded circuits dedicated to each function. The circuit structure processes the sum and difference signals through separate filters and then recombines them to recover the separate channels (adding and subtracting respectively).
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Chin Vivian
Dickstein & Shapiro LLP
Tran Con P
Wolfson Microelectronics plc
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