An Expert System Devoted to Automated Music Identification and Recognition - Intelligent Music Information Systems: Tools and Methodologies - page 90

AND Baroque tendency_II = yes AND
Baroque style_I = yes

Table 5. Second second-level table

C1 C2 C3 ¬C3 C4 ¬C4

THEN first approach to identification =
Baroque”

G1 F1 T1 T1 T2 T1 T4 T1

G1 ¬F1 T2 T2 T4 T2 T4 T2

G1 F2

T1 T2 T2 T2 T4 T2

and

G1 F3 T4 T2 T4 T4 T4 T4

G1 F4 T4 T4 T4 T4 T4 T1

“IF Classic tendency_I = yes AND Rococo
characteristics = yes

G2 F1 T1 T2 T2 T2 T4 T2

G2 ¬F1 T2 T2 T2 T2 T4 T2

AND Classic tendency_II = yes AND Ba-
roque style_I = no

G2 F2 T2 T2 T2 T2 T4 T2

G2 F3 T4 T2 T3 T2 T4 T2

THEN first approach to identification =
Rococo”.

G2 F4 T4 T4 T4 T4 T4 T2

G3 F1 T2 T2 T2 T4 T4 T2

G3 ¬F1 T4 T2 T3 T4 T4 T3

Note that the production rule

G3 F2 T2 T2 T3 T2 T4 T2

G3 F3

T4 T2 T3 T4 T4 T3

A3 ^ B2 ^ E3 ^ ¬D1 → S2

G3 F4 T4 T4 T4 T4 T4 T3

contains two Classic items (A3, B3), only one
Rococo item (B2) and the specification that it does
not contain any Baroque item (¬D1). At first sight,
one might be inclined to assign S3 (“Classic”)
as the “second approach to identification”, while
the experts assigned S2 (Rococo) The reason
was that, for assigning an approach as S3 or S2,
experts were not just looking at S1, S2, S3, S4 as
totally meaningless variables. Rather, they took
into account that the meaning of these symbols
result from the meaning of the symbols A,B,D,E
which meanings, on their turn, depend on X1 to
X23 (and their contraries). A careful consideration
of all chaining

second second-level table

Let us denote by T1, T2, T3 and T4, the expressions
“second approach to identification = Baroque”,
“second approach to identification = Rococo”,
“second approach to identification = Classic”,
“second approach to identification = none of these
styles”. The combinations of the G, C and F, give
rise to the Table 5.
For instance, the first and the last of the 90
second-level production rules corresponding to
Table 5 are:

G1 ^ F1 ^ C1 → T1
G3 ^ F4 ^ ¬ C4 → T3

A
X → B → S
D
E

which, respectively, mean

“IF Baroque qualities = yes AND Baroque
style_II = yes

has to be made because the literals X that char-
acterize S can be so relevant that they sometimes
substantially influence the results.

AND Baroque condition = yes

THEN second approach to identification =
Baroque”