20  * 2 * cos(2 * PI * k / N) precalculated for all k
24 	/* k << 15 (source: hfc-4s/8s documentation (www.colognechip.de)) */
31 	{'1', '2', '3', 'A'},
124 	int k, n, i;  in dsp_dtmf_goertzel_decode()  local
158 		for (k = 0; k < NCOEFF; k++) {  in dsp_dtmf_goertzel_decode()
165 			/* compute |X(k)|**2 */  in dsp_dtmf_goertzel_decode()
166 			result[k] =  in dsp_dtmf_goertzel_decode()
168 				(((cos2pik[k] * sk) >> 15) * sk2) +  in dsp_dtmf_goertzel_decode()
184 	for (k = 0; k < NCOEFF; k++) {  in dsp_dtmf_goertzel_decode()
189 		cos2pik_ = cos2pik[k];  in dsp_dtmf_goertzel_decode()
199 		/* compute |X(k)|**2 */  in dsp_dtmf_goertzel_decode()
200 		result[k] =  in dsp_dtmf_goertzel_decode()
202 			(((cos2pik[k] * sk) >> 15) * sk2) +  in dsp_dtmf_goertzel_decode()
234 		printk(KERN_DEBUG "a %3d %3d %3d %3d %3d %3d %3d %3d"  in dsp_dtmf_goertzel_decode()
235 		       " tr:%3d r %3d %3d %3d %3d %3d %3d %3d %3d\n",  in dsp_dtmf_goertzel_decode()
237 		       result[3] / 10000, result[4] / 10000, result[5] / 10000,  in dsp_dtmf_goertzel_decode()
240 		       result[2] / (tresh_100), result[3] / (tresh_100),  in dsp_dtmf_goertzel_decode()
248 	treshl = tresh >> 3;  /* tones which are not on, must be below 9 dB */  in dsp_dtmf_goertzel_decode()
290 	/* the tone (or no tone) must remain 3 times without change */  in dsp_dtmf_goertzel_decode()