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銆�銆�G.729A绠楁硶涓殑LPC妯″銆丩SP閲忓寲鍙婃縺鍕�(l矛)纰兼湰鎼滅储鑰楁檪(sh铆)鏈�澶氾紝鐐洪��(j矛n)涓�姝ユ彁楂樹唬纰兼晥鐜�锛屽皪(du矛)鐩搁棞(gu膩n)瑷�(j矛)绠�銆丗IR婵炬尝绛夐儴鍒嗗嚱鏁�(sh霉)鐢ㄧ窔鎬у尟绶ㄨ獮(y菙)瑷�閫�(j矛n)琛屼簡鏀瑰(xi臎)锛屽苟鐢ㄧ暙(hu脿)鐩搁棞(gu膩n)鍦栫瓑鏂规硶鏈夐嚌灏�(du矛)鎬х殑閫�(j矛n)琛屽劒(y艒u)鍖栥�傜稉(j墨ng)鍖法鍎�(y艒u)鍖栧櫒鍎�(y艒u)鍖栧悗锛屼唬纰兼晥鐜囨瘮C瑾�(y菙)瑷�鐩存帴绶ㄨ鏈夋槑椤彁楂�銆�
銆�銆�5. 鍎�(y艒u)鍖栧伐浣滅殑鍓�(chu脿ng)鏂伴粸(di菐n)
銆�銆�鍦ㄥ皪(du矛)G.729A鐨勫劒(y艒u)鍖栦腑锛屾湰鏂囧湪鍓嶄汉鐮旂┒鎴愭灉鐨勫熀绀�(ch菙)涓�锛岄嚌灏�(du矛)TMS320DM642 DSP绯诲垪鑺墖鎻愬嚭浜嗕竴浜涙湁鍍�(ji脿)鍊肩殑鏂版柟娉曘�傞�欎簺鍓�(chu脿ng)鏂伴粸(di菐n)鍦ㄤ笉鍚岀▼搴︿笂鎻愰珮浜嗕唬纰肩殑鍎�(y艒u)鍖栭�熷害鍜屽煼(zh铆)琛屾晥鐜�锛屽湪瑾�(y菙)闊崇法瑙ｇ⒓鐨凞SP瀵�(sh铆)鏅�(sh铆)瀵�(sh铆)鐝�(xi脿n)涓捣鍒颁簡闂�(gu膩n)閸垫�т綔鐢�銆備笅闈�锛屼互鑸変緥鐨勬柟寮忛棥鏄庝竴浜涚稉(j墨ng)鍏哥殑鏂规硶銆�
銆�銆�5.1 绻埗鍒嗘瀽鍦�锛屾帉鎻″嚱鏁�(sh霉)绲�(ji茅)妲�(g貌u)
銆�銆�灏�(du矛)浜庝竴鍊�(g猫)瑾�(y菙)鍙ヨ純澶�銆佺祼(ji茅)妲�(g貌u)寰�(f霉)闆滅殑鍑芥暩(sh霉)锛岀偤浜嗗厖鍒嗕簡瑙ｅ叾閭忚集绲�(ji茅)妲�(g貌u)鍜岃獮(y菙)鍙ョ殑鐩搁棞(gu膩n)鎬э紝鎴戝�戦�氬父閲囩敤鐣�(hu脿)鍒嗘瀽鍦栫殑鏂规硶銆傚垎鏋愬湒鐨勫舰寮忔瘮杓冮潏娲伙紝鍙互鏍规摎(j霉)鍏烽珨鐨勬儏娉侀伕鐢ㄤ笉鍚岀殑鍒跺湒宸ュ叿銆傚湪绶ㄥ(xi臎)绶氭�у尟绶ㄧ殑鏅�(sh铆)鍊欙紝闇�瑕佽�冩叜瀛樺彇鏁�(sh霉)绲勪腑鐨勫厓绱�锛屾暩(sh霉)鎿�(j霉)鎵撳寘鎿嶄綔鍜屾暩(sh霉)鎿�(j霉)鐩搁棞(gu膩n)鎬х瓑鍟�(w猫n)椤�锛屽垎鏋愬湒鏈夊姪浜庢纰鸿檿鐞嗛�欎簺鍟�(w猫n)椤�銆�
銆�銆�鍦ㄥ皪(du矛)鍑芥暩(sh霉)Cor_h_X锛� 锛夊劒(y艒u)鍖栭亷(gu貌)绋嬩腑锛屾垜鍊戦亣鍒颁簡涓�瀹氱殑鍥伴洠锛屽師鍥犲湪浜庡叾涓湁涓�鍊�(g猫)闆欏堡鐨勫惊鐠�(hu谩n)楂�锛屽収(n猫i)灞ょ殑娆℃暩(sh霉)鑸囧灞ゆ湁闂�(gu膩n)锛屽灞ょ殑寰挵(hu谩n)娆℃暩(sh霉)鐐�40锛屽苟涓斿惊鐠�(hu谩n)鍏�(n猫i)閮ㄧ殑瑾�(y菙)鍙ユ湁鍏堝悗鐨勭浉闂�(gu膩n)鎬�銆傞�欐ǎ鐨勭祼(ji茅)妲�(g貌u)濡傛灉鐢ㄥ惊鐠�(hu谩n)灞曢枊(k膩i)鐨勬柟娉曞皣鏈�(hu矛)鐢ㄥ埌澶ч噺鐨勫瘎瀛樺櫒锛屾暩(sh霉)鐩秴鍑轰簡64鍊�(g猫)锛岄渶瑕侀枊(k膩i)杈熼澶栫殑鍏�(n猫i)瀛樼┖闁撳幓瀛樻斁鑷ㄦ檪(sh铆)璁婇噺锛岃�岃畝瀵�(xi臎)鍏�(n猫i)瀛樻渻(hu矛)娑堣�楄純澶氱殑鏅�(sh铆)闁�锛屽洜姝ら�欐ǎ鍩�(zh铆)琛屾晥鐜囦笉鏈�(hu矛)鏈夊厖鍒嗙殑鎻愰珮銆傚皪(du矛)姝�锛屾垜鍊戝埄鐢ㄥ垎鏋愬湒鎻忚堪浜嗗嚱鏁�(sh霉)涓棞(gu膩n)閸典唬纰肩殑鏁�(sh霉)绲刋[ ]锛宧[ ]鐨勪娇鐢ㄦ儏娉�锛屽鍦�1鎵�绀猴細
銆�銆�鍦�1 cor_h_X锛� 锛夊嚱鏁�(sh霉)鍒嗘瀽鍦栵紙閮ㄥ垎锛�
銆�銆�鍦�1鐩磋鍦板弽鏄犱簡鏁�(sh霉)绲�16浣峢[ ]鍜�16浣峏[ ]涔嬮枔鐨勪箻鍔犻棞(gu膩n)绯�锛屽緸鍑芥暩(sh霉)cor_h_X锛� 锛変腑鍙煡锛屽叐鍊�(g猫)鏁�(sh霉)绲勭殑涔樼⿳涔嬪拰瑕佸皪(du矛)鎳�(y墨ng)鐨勪繚瀛樺湪鑷ㄦ檪(sh铆)鏁�(sh霉)绲�32浣峐[ ]涓�銆傞�氶亷(gu貌)鐮旂┒姝ゅ垎鏋愬湒锛屾垜鍊戠櫦(f膩)鐝�(xi脿n)h[ ]鑸嘪[ ]涓殑涓�浜涘厓绱犻��(j矛n)琛屼箻绌嶅拰铏曠悊涔嬪悗灏变笉鍐嶈浣跨敤锛岄偅涔堝瓨鍎�(ch菙)閫欎簺鍏冪礌鐨勫瘎瀛樺櫒鍙互瀛樻斁涓枔绲�(ji茅)鏋滐紙Y[]鐨勫厓绱狅級锛岄�欐ǎ灏卞彲绡�(ji茅)鐪佸瘎瀛樺櫒鐨勪娇鐢ㄥ��(g猫)鏁�(sh霉)锛屽厤鍘讳簡闁�(k膩i)杈熷収(n猫i)瀛樼┖闁撳拰涓枔璁婇噺鐨勫瓨鍙栨寚浠�銆�
銆�銆�灏�(du矛)浜庡嚱鏁�(sh霉)cor_h_X锛� 锛�锛屽埄鐢ㄤ笂杩版�濇兂绶ㄥ(xi臎)绶氭�у尟绶紝鍙渶瑕佸畾缇�57鍊�(g猫)瀵勫瓨鍣ㄥ氨鍙互瀹屾垚鎵�鐢ㄧ殑鎿嶄綔锛屽瓨鍙栨寚浠ゅ緸1760姊濆劒(y艒u)鍖栧埌30姊濓紝鍍呯偤鍘熶締(l谩i)鐨�1/60銆傚悓鏅�(sh铆)鍩�(zh铆)琛岄�熷害寰�390072鍊�(g猫)鏅�(sh铆)閻樻笡灏戝埌35871鍊�(g猫)锛岄檷鐐哄師渚�(l谩i)鐨�1/10銆�
銆�銆�绻埗鐨勫垎鏋愬湒鍙互鍖呭惈鐩搁棞(gu膩n)鍦栵紝鐩搁棞(gu膩n)琛ㄧ瓑锛屼娇璩囨簮瀹夋帓鏇村姞鍚堢悊銆傝┎鏂规硶鍦ㄥ叾浠栧嚱鏁�(sh霉)鐨勬敼瀵�(xi臎)涓篃澶氭浣跨敤鍒�銆�
銆�銆�5.2 鍔熻兘鐩镐技鐨勫嚱鏁�(sh霉)鎴栦唬纰兼鍚堝苟鐐轰竴鍊�(g猫)鍑芥暩(sh霉)
銆�銆�绶氭�у尟绶ㄥ湪鎻愰珮浠ｇ⒓鏁堢巼鐨勫悓鏅�(sh铆)涔熸垚鍊嶇殑澧炲姞浜嗕唬纰煎昂瀵�锛屼互涓婅堪cor_h_X锛� 锛夌偤渚�锛屽畠鍦ㄨ┎瀵�(xi臎)鍚庝唬纰煎昂瀵稿緸660姊濆澶у埌7776姊濓紙瑭叉暩(sh霉)鎿�(j霉)鐢盋CS鍓栨瀽宸ュ叿鍒嗘瀽鎵�寰楋級銆傚湪宸ョ▼鎳�(y墨ng)鐢ㄤ腑锛屽皪(du矛)浜庢湁闄愮殑鍏�(n猫i)瀛樼▼搴忓崁(q奴)锛屾垜鍊戞渻(hu矛)閬╃暥(d膩ng)娓涘皯绋嬪簭鍗犵敤鐨勭┖闁�銆傚悎骞跺姛鑳界浉浼肩殑鍑芥暩(sh霉)鍙互閬�(d谩)鍒伴�欎竴瑕佹眰銆�
銆�銆�鍦↙SP閲忓寲铏曠悊涓紝婧愪唬纰间腑绲﹀嚭浜�2鍊�(g猫)LSP閬告搰鍑芥暩(sh霉)锛歀sp_select_1锛� 锛夊拰Lsp_select_2锛� 锛�锛岃�屾垜鍊戠櫦(f膩)鐝�(xi脿n)瀹冨�戝叿鏈夌浉鍚岀殑鍔熻兘鍜岀浉浼肩殑绲�(ji茅)妲�(g貌u)锛屽洜姝わ紝鍦ㄥ皪(du矛)鍏╄�呯殑绶氭�у尟绶ㄦ敼瀵�(xi臎)涓�锛屾垜鍊戝彧闇�绶ㄥ(xi臎)涓�鍊�(g猫)鍑芥暩(sh霉)锛堝懡鍚嶇偤L(zh菐ng)sp_select锛夊嵆鍙(sh铆)鐝�(xi脿n)LSP閲忓寲铏曠悊涓�欏叐鍊�(g猫)妯″鐨勫姛鑳�銆�
銆�銆�鍙﹀锛屽湪灏�(du矛)浜庝竴浜涙暩(sh霉)绲勬嫹璨�锛屾暩(sh霉)绲勫垵濮嬪寲鐨勪唬纰硷紝鎴戝�戝悓妯ｅ彲浠ョ敤姝ゆ柟娉�锛岀法瀵�(xi臎)涓�鍊�(g猫)鍑芥暩(sh霉)瀵�(sh铆)鐝�(xi脿n)锛岄�欐ǎ鍙互鍦ㄦ彁楂樺煼(zh铆)琛屾晥鐜囩殑鍚屾檪(sh铆)锛屾笡灏戠▼搴忓崰鐢ㄧ殑鍏�(n猫i)瀛樼┖闁撱��
銆�銆�5.3 澶氬��(g猫)寰挵(hu谩n)鍚堝苟鐐轰竴鍊�(g猫)寰挵(hu谩n)
銆�銆�C浠ｇ⒓鏀瑰(xi臎)绶氭�у尟绶ㄧ殑鏅�(sh铆)鍊�锛屾垜鍊戝父甯告渻(hu矛)鐧�(f膩)鐝�(xi脿n)锛屽彧瑕佷綔涓�浜涜(di脿o)鏁达紝鍏╁��(g猫)鎴栧鍊�(g猫)寰挵(hu谩n)瀹屾垚鐨勬搷浣滃畬鍏ㄥ彲浠ョ敱涓�鍊�(g猫)寰挵(hu谩n)渚�(l谩i)瀹屾垚銆備互LPC瀛愭ā濉�240榛�(di菐n)鍔犵獥瑾�(y菙)闊崇殑鑷浉闂�(gu膩n)瑷�(j矛)绠桝utocorr锛堬級鍑芥暩(sh霉)鐐轰緥锛岀稉(j墨ng)閬�(gu貌)鍎�(y艒u)鍖栨敼瀵�(xi臎)鐨凜浠ｇ⒓锛堥儴鍒嗭級濡備笅锛�
銆�銆�for锛坕=0; i<L_WINDOW; i++锛� //鍊�(g猫)寰挵(hu谩n)楂�
銆�銆�y[i] = 锛坃smpy锛坸[i], hamwindow[i]锛�+0x00008000L锛�>>16;
銆�銆�sum = 1; //閬垮厤鐐�0鐨勬儏娉�
銆�銆�for锛坕=0; i<L_WINDOW; i++锛� //绗簩鍊�(g猫)寰挵(hu谩n)楂�
銆�銆�sum = _sadd锛坰um,_smpy锛坹[i], y[i]锛夛級;
銆�銆�閫欐浠ｇ⒓鍖呭惈浜嗗叐鍊�(g猫)for寰挵(hu谩n)锛屽湪CCS涓洿鎺ョ法璀亱(y霉n)琛屽苟琛屽害寰堝樊锛屽埄鐢ㄧ窔鎬у尟绶ㄩ噸瀵�(xi臎)浠ｇ⒓銆傛垜鍊戠櫦(f膩)鐝�(xi脿n)鍏╁��(g猫)寰挵(hu谩n)楂旂殑寰挵(hu谩n)娆℃暩(sh霉)鍧囩偤60锛圠_WINDOW=60锛�锛屾墍铏曠悊鐨勬暩(sh霉)绲勪笉鍚�锛屽苟涓斿叐鍊�(g猫)寰挵(hu谩n)娌�(m茅i)鏈夌浉闂�(gu膩n)鎬�锛屽彲浠ユ妸鍜岀浜屽��(g猫)寰挵(hu谩n)鍚堝苟鎴愪竴鍊�(g猫)寰挵(hu谩n)銆傚墠鑰呯殑鍔熻兘鏄皪(du矛)瑾�(y菙)闊充俊铏�(h脿o)閫�(j矛n)琛屽姞绐楋紱鍚庤�呮槸瀵�(sh铆)鐝�(xi脿n)涔樼疮鍔狅紙Mac锛夈�傚叐鑰呭悎骞跺悗閲囩敤绶氭�у尟绶ㄧ法瀵�(xi臎)锛屽叾浠ｇ⒓濡備笅锛�
銆�銆�mvk 60,i //瑷�(sh猫)缃惊鐠�(hu谩n)娆℃暩(sh霉)
銆�銆�loop1: lddw *ham++,hamih:hamil //hamwindow[]鎸囬嚌
銆�銆�lddw *x++,xih:xil //x[]鎸囬嚌
銆�銆�smpy2 hamil,xil,yi1:yi0 //鍏╁皪(du矛)16浣嶆搷浣滄暩(sh霉)鐩告壙锛屽苟琛屽煼(zh铆)琛�
銆�銆�smpy2 hamih,xih,yi3:yi2
銆�銆�sadd yi0,con0x8000,yi0
銆�銆�sadd yi1,con0x8000,yi1
銆�銆�sadd yi2,con0x8000,yi2
銆�銆�sadd yi3,con0x8000,yi3
銆�銆�packh2 yi1,yi0,yl //鏁�(sh霉)鎿�(j霉)鎵撳寘鎶�琛�(sh霉)
銆�銆�packh2 yi3,yi2,yh
銆�銆�stdw yh:yl,*y++ //闆欏瓧瀛樺彇锛屾彁楂樺煼(zh铆)琛屾晥鐜�
銆�銆�smpy2 yl,yl,yi1:yi0
銆�銆�sadd sum0,yi1,sum0
銆�銆�sadd sum0,yi0,sum0
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銆�銆�sadd sum0,yi2,sum0
銆�銆�add i,-1,i
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