Info
This is archived material from the Federal Bureau of Investigation (FBI) website. It may contain outdated information and links may no longer function.

Table 5b

Table 5b: Correlation values and differences for the reformatted clipped-sample restoration of the second sample sentence, using the two programs. The differences are relative to the correlation values for the native-source to clipped-file comparisons, for each respective file format (see Table 5a). Negative values are contained in parentheses.

Sample Sentence #2 (Native to Reformatted Restored)

Native File
(Reformatted File)

Amount
Clipped
(dB)

Program #1

Program #2

Correlation
(to Reformatted
Restored)

Difference

Correlation
(to Reformatted
Restored)

Difference

8 kHz/8-bit
(8 kHz/16-bit)

+3

N/A

N/A

0.9472

(0.0497)

+6

N/A

N/A

0.8894

(0.0942)

+9

N/A

N/A

0.8872

(0.0706)

+12

N/A

N/A

0.8712

(0.0511)

8 kHz/8-bit
(44.1 kHz/16-bit)

+3

0.9969

0.0000

0.9971

0.0001

+6

0.9837

0.0000

0.9837

0.0000

+9

0.9580

0.0002

0.9576

(0.0002)

+12

0.9226

0.0004

0.9221

(0.0002)

11.025 kHz/8-bit
(11.025 kHz/16-bit)

+3

0.9904

(0.0067)

0.9906

(0.0064)

+6

0.9644

(0.0200)

0.9605

(0.0239)

+9

0.9171

(0.0422)

0.9284

(0.0309)

+12

0.8344

(0.0898)

0.8963

(0.0279)

11.025 kHz/16-bit
(44.1 kHz/16-bit)

+3

0.9973

0.0000

0.9974

0.0002

+6

0.9850

0.0003

0.9860

0.0014

+9

0.9600

0.0004

0.9613

0.0017

+12

0.9246

0.0004

0.9260

0.0019

16 kHz/8-bit
(16 kHz/16-bit)

+3

0.9983

0.0012

0.9967

(0.0005)

+6

0.9890

0.0045

0.9849

0.0005

+9

0.9649

0.0054

0.9584

(0.0011)

+12

0.9285

0.0043

0.9189

(0.0053)

16 kHz/16-bit
(44.1 kHz/16-bit)

+3

0.9974

0.0000

0.9983

0.0009

+6

0.9852

0.0002

0.9873

0.0024

+9

0.9605

0.0003

0.9648

0.0046

+12

0.9605

0.0354

0.9648

0.0397