From: Prashant Laddha <prladdha@xxxxxxxxx> FM (frequency modulated) signal for SDR is generated by varying the phase, where phase variation is proportional to input signal. It is seen that, the larger phase increments leads to discontinuities in the signal recovered after demodulation. Reducing the extent of phase variation with respect to input signal, equivalent to reducing the modulation index. Tested using FM receiver flow graph in gnuradio-companion. Cc: Antti Palosaari <crope@xxxxxx> Signed-off-by: Prashant Laddha <prladdha@xxxxxxxxx> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx> --- drivers/media/platform/vivid/vivid-sdr-cap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/vivid/vivid-sdr-cap.c b/drivers/media/platform/vivid/vivid-sdr-cap.c index 5e089cb..caf1316 100644 --- a/drivers/media/platform/vivid/vivid-sdr-cap.c +++ b/drivers/media/platform/vivid/vivid-sdr-cap.c @@ -454,7 +454,7 @@ void vivid_sdr_cap_process(struct vivid_dev *dev, struct vivid_buffer *buf) FIXP_2PI) >> (31 - FIXP_N); dev->sdr_fixp_src_phase += src_phase_step; - dev->sdr_fixp_mod_phase += mod_phase_step; + dev->sdr_fixp_mod_phase += mod_phase_step / 4; /* * Transfer phases to [0 / 2xPI] in order to avoid variable -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
