Also, there are two modulation inputs, X and Y, to the slot. Note that these two inputs will be halved by the averaging operation. Therefore, when the input of the slot is connected by one, set the same parameter to the input of X and Y, and input the sound stack data of the same slot. If only one side input is set, unexpected data may be mixed in, or the FM modulation level may be felt small.
Next, we will calculate each parameter using the calculation method of “MDXSL” and “MDYSL”, using an example of a 4-slot FM sound source actually used in FM speech synthesis.
First, we will explain how to read the FM speech synthesis algorithm shown in Figure 4.33.
Figure 4.33 Algorithm with 4 slots
● Slot 0
】 Slot 0 uses the output for slot 2 input, while slot 0 output for slot 0 input. This is called self-feedback.
● Slot 1
】 Slot 1 uses output as input for slot 2.
● Slot 2
∙ Slot 2 uses the output of slot 0 and slot 1 as input. The output is used for slot 3 input.