```python
def arti_neuron(x, w, b):
"""Calculate output signal based on input signals.
Parameters:
x : list of float - Input signals.
w : list of float - Weights of connections.
b : float - Bias of the neuron.
Returns:
float - Output signal.
"""
# YOUR CODE HERE
# Test your function.
assert arti_neuron([1, 0, 1], [1, 2, 3], -2) == 2
assert arti_neuron([1, 0, 0], [1, 2, 3], -2) == 0
```