An Expert System Devoted to Automated Music Identification and Recognition - Intelligent Music Information Systems: Tools and Methodologies - page 91

Table 6. Third second-level table
I1

Table 7. Third-level table

I2 I3 I4

V1 V2 V3 V4

H1 V1 V2 V4 V4

S1 T1 Z1 Z1 Z2 Z4

H2 V2 V2 V2 V4

S2 T2 Z2 Z2 Z2 Z4

H3 V4 V2 V3 V4

S2 T3 Z2 Z2 Z3 Z4

S2 T4 Z4 Z4 Z4 Z4

S3 T1 Z2 Z2 Z4 Z4

and

S3 T2 Z2 Z2 Z3 Z4

S3 T3 Z4 Z2 Z3 Z4

“IF Classic qualities = yes AND none of the
three styles_II = yes

S3 T4 Z4 Z4 Z4 Z4

S4 T1 Z4 Z4 Z4 Z4

AND none of the conditions = no

S4 T2 Z4 Z4 Z4 Z4

THEN second approach to identification =
Classic”.

S4 T3 Z4 Z4 Z4 Z4

S4 T4 Z4 Z4 Z4 Z4

third second-level table

third-level table

Let us denote by V1, V2, V3 and V4, the expres-
sions “third approach to identification = Baroque”,
“third approach to identification = Rococo”, “third
approach to identification = Classic”, “third ap-
proach to identification = none of these”. The com-
binations of the H and I, give rise to Table 6.
For instance, the first and the last of the 12
second-level production rules corresponding to
Table 6 are.

As said above, {S1,...,S4}, {T1,…,T4} and
{V1,…,V4}, were three sets of literals that were
called “first, second and third approaches” to the
identification of a style. By combining them into
Table 7, the user obtains the final identification,
expressed by the letters Z1 (final identification =
Baroque), Z2 (final identification = Rococo), Z3
(final identification = Classic), Z4 (final identifica-
tion = none of these).
For instance, two examples, among 48 third-
level production rules corresponding to Table 7
are.

H1 ^ I1 → V1
H3 ^ I4 → V4

which, respectively, mean

S1 ^ T1 ^ V1 → Z1
S3 ^ T3 ^ V1 → Z4

“IF Baroque structure = yes AND Baroque
composition = yes

THEN third approach to identification =
Baroque”

which, respectively, mean

“IF first approach to identification = Ba-
roque

and

AND second approach to identification =
Baroque

“IF Classic structure = yes AND none of
the three styles composition = yes THEN
third approach to identification = none”.

AND third approach to identification =
Baroque

THEN final identification = Baroque”