RM0020 datasheet(66/69 Pages) STMICROELECTRONICS

66 / 69 page

Performance

RM0020

66/69

N - length of input vectors, M - length of output vector.

Table 53.

fir_float - FIR filter for float data

N(1)

ntaps(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

256

12974

12856

12862

3.0

0.98

256

13762

13633

3.2

0.98

256

19119

19008

19006

3.1

0.99

256

35516

35392

35390

2.9

0.99

N - number of output samples, ntaps - number of filter coefficients.

Table 54.

fir_frac16 - FIR filter for frac16 data

N(1)

ntaps(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

256

10631

10544

10550

3.8

0.97

256

11294

11196

11193

4.0

0.97

256

16018

15926

3.8

0.98

256

30358

30262

3.5

0.99

N - number of output samples, ntaps - number of filter coefficients.

Table 55.

iir_float_1st - first-order IIR filter for float data

N(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

128

1013

935

2.2

0.97

256

1946

1831

2.2

0.97

N - number of input/output samples.

Table 56.

iir_float_2nd - second-order IIR filter for float data

N(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

128

1265

1171

2.5

1.00

256

2403

2291

2.5

1.00

N - number of input/output samples.

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