Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2006-05-11
2009-12-01
Malzahn, David H (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
07627623
ABSTRACT:
Provided are an IMDCT co-processor and an audio decoder having the same. The IMDCT co-processor includes: an input buffer for storing an input inverse-quantized frequency spectrum sample value; an I/Q separator for dividing the sample value stored in the input buffer into real data I and imaginary data Q; a first operation unit for performing complex-multiplication on the data divided by the I/Q separator and a given twiddle factor; an IFFT unit for performing an inverse fast Fourier transform on the operation result value of the first operation unit; a second operation unit for performing complex-multiplication on the result value from the IFFT unit and a given twiddle factor; a deinterleaver for receiving the operation result value from the second operation unit to arrange data and performing inverse-mapping on a positive value (+) and a negative value (−) of a certain portion of the data to each other to output a final IMDCT time sample value; and a control register for selecting the input inverse-quantized frequency spectrum sample value according to a given window sequence value to determine the final IMDCT time sample value.
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Eum Nak Woong
Jung Hee Bum
Lee Suk Ho
Electronics and Telecommunications Research Institute
Ladas & Parry LLP
Malzahn David H
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