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}
output(a2);
ISO/IEC 14496-3:2005(E)
The two instances of sasbf operate simultaneously and in parallel. The first synthesises sound from preset 13,
bank 1 (since this is the preset number to which the instrument responds); the second, from preset 48, bank 2.
They return audio signals that are summed together and manipulated with the bandpass core opcode.
5.8.6.8 Standard names
5.8.6.8.1 Definition
Not all identifiers to be referenced in an instrument or opcode are required to be declared as variables. Several
identifiers, listed in this subclause, are termed standard names, shall not be used as variables, and have fixed
semantics that shall be implemented in a compliant SAOL decoder. Standard names may otherwise be used as
variables, embedded in expressions, etc. in any SAOL instrument or opcode. However, the semantics of using a
standard name as an lvalue are undefined.
The implicit definition of each standard name, showing the rate semantics and width of that standard name, is
listed, and the semantics of the value of the standard name specified in the subsequent subclauses.
5.8.6.8.2 k_rate
ivar k_rate
The standard name k_rate shall contain the control rate of the orchestra, in Hz.
5.8.6.8.3 s_rate
ivar s_rate
The standard name s_rate shall contain the sampling rate of the orchestra, in Hz.
5.8.6.8.4 inchan
ivar inchan
The standard name inchan, in each scope, shall contain the number of channels of input being provided to the
instrument instantiation with which that scope is associated. “Associated” shall be taken to mean, for instrument
code, the instrument instantiation for which the scope memory was created; for opcode code, the instrument
instantiation that called the opcode, or called the opcode’s caller, etc.
Different instances of the same instrument may have different numbers of input channels if, for example, they are
the targets of different send statements. Instructions for calculating the value of this standard name are provided in
subclause 5.7.3.3.5.2
5.8.6.8.5 outchan
ivar outchan
The standard name outchan, in each scope, shall contain the number of channels of output provided by the
instrument instantiation with which that scope is associated, in the sense described in subclause 5.8.6.8.4.
5.8.6.8.6 time
ivar time
The standard name time, in each scope, shall contain the time at which the instrument instantiation associated
with that scope was created.
© ISO/IEC 2005— All rights reserved 49