33 echo_can_disable_detector_init(struct ec_disable_detector_state *det)  in echo_can_disable_detector_init()  argument
38 	biquad2_init(&det->notch,  in echo_can_disable_detector_init()
45 	det->channel_level = 0;  in echo_can_disable_detector_init()
46 	det->notch_level = 0;  in echo_can_disable_detector_init()
47 	det->tone_present = FALSE;  in echo_can_disable_detector_init()
48 	det->tone_cycle_duration = 0;  in echo_can_disable_detector_init()
49 	det->good_cycles = 0;  in echo_can_disable_detector_init()
50 	det->hit = 0;  in echo_can_disable_detector_init()
55 echo_can_disable_detector_update(struct ec_disable_detector_state *det,  in echo_can_disable_detector_update()  argument
60 	notched = biquad2(&det->notch, amp);  in echo_can_disable_detector_update()
67 	det->channel_level += ((abs(amp) - det->channel_level) >> 5);  in echo_can_disable_detector_update()
68 	det->notch_level += ((abs(notched) - det->notch_level) >> 4);  in echo_can_disable_detector_update()
69 	if (det->channel_level > 280) {  in echo_can_disable_detector_update()
72 		if (det->notch_level * 6 < det->channel_level) {  in echo_can_disable_detector_update()
74 			if (!det->tone_present) {  in echo_can_disable_detector_update()
76 				if (det->tone_cycle_duration >= 425 * 8  in echo_can_disable_detector_update()
77 				    && det->tone_cycle_duration <= 475 * 8) {  in echo_can_disable_detector_update()
78 					det->good_cycles++;  in echo_can_disable_detector_update()
79 					if (det->good_cycles > 2)  in echo_can_disable_detector_update()
80 						det->hit = TRUE;  in echo_can_disable_detector_update()
82 				det->tone_cycle_duration = 0;  in echo_can_disable_detector_update()
84 			det->tone_present = TRUE;  in echo_can_disable_detector_update()
86 			det->tone_present = FALSE;  in echo_can_disable_detector_update()
87 		det->tone_cycle_duration++;  in echo_can_disable_detector_update()
89 		det->tone_present = FALSE;  in echo_can_disable_detector_update()
90 		det->tone_cycle_duration = 0;  in echo_can_disable_detector_update()
91 		det->good_cycles = 0;  in echo_can_disable_detector_update()
93 	return det->hit;  in echo_can_disable_detector_update()