10.2.5.37 ATPL360_REG_RRC_NOTCH_INDEX (0x401A)
Array of RRC notch filter index values. There is one index for each notched frequency. The format of each index is uQ7.8 (2 bytes, where MSB must be 0). The 7 integer bits indicate the carrier index [0-127] for which the notch filter is applied. The 8 decimal bits can apply the notch filter to a frequency that is between two consecutive carriers.
To convert the notch index to frequency (in Hz), the following formula is applied:
F = INDEX * Fs / 65536 , where Fs is the sampling rate
in Hz:
- CENELEC-A, CENELEC-B bands: Fs = 400000 Hz
- FCC, ARIB bands: Fs = 1200000 Hz
For example:
- CENELEC-A, INDEX = 8192 (0x2000): F = 8192 * 400000 / 65536 = 50000 Hz
- FCC, INDEX = 20544 (0x5040): F = 20544 * 1200000 / 65536 = 376172 Hz
Access: Depends on noise analyzer mode (ATPL360_REG_ENABLE_AUTO_NOISE_CAPTURE (0x4016)):
- Auto-mode (1): Read-only
- Manual-mode (0): Read-write
Value Range: 10 bytes (CENELEC-A, FCC, ARIB) or 2 bytes (CENELEC-B). The number of valid 2-byte words depends on the number of notched frequencies (ATPL360_REG_RRC_NOTCH_ACTIVE (0x4019)).
Default Value: All 0s.