Signal processing circuit
AssigneeMitsubishi Electric Corporation
InventorsKohei Teramoto, Masaru Kimura, Tsuyoshi Nakada, Fuminori Saito
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Abstract
A signal processing circuit has two types of filters: an IIR filter 11 and an FIR filter 12 having an equivalent transfer function at all times. In an adjustment mode in which the signal processing circuit is adjusted to have an arbitrary transfer function, the signal processing circuit makes a configuration setting to use the IIR filter 11. When completing the adjustment or in a signal processing mode, the signal processing circuit makes a configuration setting change to switch to the FIR filter 12 having the equivalent transfer function.
Claims5
A signal processing circuit comprising:
- an IIR (“Infinite Impulse Response”) filter and an FIR (“Finite Impulse Response”) filter, each configured to process a digital signal according to a filter coefficient which is set to correspond to a transfer function;
- a filter coefficient conversion unit configured to generate a FIR filter coefficient having a same transfer function as an IIR filter coefficients of the IIR filter by using the IIR filter;
- and
- a control unit configured to determine which one of the IIR filter and the FIR filter is available for processing the digital signal, wherein,
- when adjusting the transfer function, the control unit controls the IIR filter to be available and controls the filter coefficient conversion unit to generate the FIR filter coefficient having the same transfer function as the IIR filter coefficient, and
- when finishing adjusting the transfer function or when implementing a signal processing, the control unit controls a FIR filter to be available, which is utilized for processing the digital signal according to the FIR filter coefficient generated by the filter coefficient conversion unit.
Dependencies are inferred from the claim text.