New feature of pulse programming language

6 Feb 2026 Kazuyuki Takeda

This is relevant to Opencore NMR version 2.1.0 and higher.
In the preamble of a pulse program file (*.ppg), we recommend to begin with:
```
version=2.1
```
If you use the previous version (lower than 2.1.0) and the software detect this statement on compilation, it stops compiling with a error message.

Logic gate

Logic gates can now have an argument. They can also be used without an argument as it has been.
If the argument is given, its least significant bit is assessed. The gate is activated if the bit is '1', and disactivated if it is '0'.
For example, pulse(10u; F1_Unblank(1)) is equivalent to pulse(10u; F1_Unblank), while pulse(10u; F1_Unblank(0)) is interpreted as pulse(10u; ). That is, F1_Unblank is not called.
F1_Unblank(3)) activates the gate, because the least significant bit is 1 (note that 3 is represented as "11" in binary expression).
Since 4 is "100" in binary expression and the least significant bit is '0', F1_Unblank(4) disactivates itself.
You can use variables and arithmetic operations, like pulse(10u; F1_Unblank(k)) If you have make a declaration int k=1; in the preamble of the pulse program, it is interpreted as pulse(10u; F1_Unblank(1)) and you can modify the variable k after compilation so that you can dynamically activate and disactivate in the variable table.

Another example:

pulse[4](10u; F1_Unblank(pow(-1,#)), F2_Unblank(pow(-1,(#+1))))

is interpreted as

pulse(10u/4; F1_Unblank(0), F2_Unblank(1))
pulse(10u/4; F1_Unblank(1), F2_Unblank(0))
pulse(10u/4; F1_Unblank(0), F2_Unblank(1))
pulse(10u/4; F1_Unblank(1), F2_Unblank(0))

and therefore as

pulse(2.5u;             F2_Unblank)
pulse(2.5u; F1_Unblank            )
pulse(2.5u;             F2_Unblank)
pulse(2.5u; F1_Unblank            )

expand … endExpand

In preparation

let

In preparation