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The ltmmTunerSignalStrength constants specify the possible TV Tuner signal strength indicators.
typedef enum ltmmTunerSignalStrength{ltmmTUNER_HASNOSIGNALSTRENGTH = -1,ltmmTUNER_NOSIGNAL = 0,ltmmTUNER_SIGNALPRESENT = 1} ltmmTunerSignalStrength;
[-1] The signal strength cannot be determined now.
[0] No signal detected.
[1] Signal detected.
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