You're correct DocNutJobbo, I've been in court once in 1988 for a speeding ticket and at least 8 times for jury duty.
You mount a defense for this judge for using a device meant solely to ensure the safety of those in the courtroom and proximity of the person wearing it. And yes, you can refuse to speak, answer or respond in court. It likely means that a person would suffer contempt penalties but you can still not participate. Compelling responses in this manner is torture and should mean that the overturning of his sentence should have been with prejudice.
The fact that you're so adamant about defending the judge's use of the device proves my allegation regarding you.