Christina and deanna were having a quiet conversation over drinks before the band started to play, but now they have to shout and even then can’t really hear what the other is saying. we can assume that once the band started to play, the signal-to-noise ratio in this scenario

went from high signal/low noise to low signal/high noise

Explanation:

When Christina and DeAnna were having a conversation they could hear each other properly. This means that the messages are being sent and received by both of them. The signal is high here and the noise is low.

Noise is something that hinders the message being sent and received between send and receiver.

When the band started playing the noise increased and they needed to shout in order for the messages to be sent and received.

Hence, the signal-to-noise ratio in this situation first was high then became low.

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