Coded data generation or conversion – Digital code to digital code converters – Data rate conversion
Reexamination Certificate
2007-08-28
2007-08-28
Nguyen, Khai M. (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
Data rate conversion
C370S538000, C370S543000, C370S545000, C708S290000, C708S300000, C708S313000
Reexamination Certificate
active
10325202
ABSTRACT:
An asynchronous sample rate converter interpolates and filters a digital audio input signal to produce a filtered, up-sampled first signal. A FIFO memory receives the first signal and stores samples thereof at locations determined by a write address and presents stored samples from locations determined by a read address. The presented samples are passed through an interpolation and resampling circuit to produce a continuous-time signal which is re-sampled to produce a signal that is up-sampled relative to a desired output. That signal then is filtered and down-sampled to produce the output signal. Sample rate estimating circuitry computes a difference signal representative of a time at which a data sample of the audio input signal is received and a time at which a corresponding audio output sample is required, and address generation circuitry generates the read and write addresses. A coefficient calculation circuit calculates filter coefficients for the interpolation and resampling circuit in response to the difference signal.
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Chang Jung-Kuei
Sculley Terry L.
Yu Xianggang
Brady III Wade J.
Nguyen Khai M.
Telecky , Jr. Frederick J.
Texas Instruments Incoporated
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