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ADSP-2181鎻愪緵閫欑ó鑳藉姏锛屽畠鐨勭涓€鍦板潃鎸囬嚌绲処0锛孖1锛孖2锛孖3鏈夊湴鍧€鍙嶈綁(zhu菐n)鑳藉姏锛岃€岀浜屽湴鍧€鎸囬嚌绲処4锛孖5锛孖6锛孖7鍗讳笉鍙楀湴鍧€鍙嶈綁(zhu菐n)妯″紡鐨勫奖闊�.鎵€浠ュ緸绗簩鍦板潃鎸囬嚌绲勪腑閬告搰鎸囬嚌閫�(j矛n)琛岃几鍏ョ珐娌�锛屽緸绗竴鍦板潃鎸囬嚌绲勪腑閬告搰鎸囬嚌閫�(j矛n)琛孎FT瑷�(j矛)绠�. 锛�3锛夎伈瀛�(xu茅)妯″瀷鐨勬敼閫�(j矛n)銆€鐢―SP瀵�(sh铆)鐝�(xi脿n)蹇冪悊鑱插(xu茅)妯″瀷鐨勪竴鍊�(g猫)闆ｉ鏄叾涓湁澶ч噺鐨勫皪(du矛)鏁�(sh霉)閬�(y霉n)绠�锛岄洊鐒跺彲浠ョ敤澶氶爡(xi脿ng)寮忛€艰繎姹傚緱鍏惰繎浼煎€硷紝浣嗘槸鍏跺法澶х殑閬�(y霉n)绠楅噺瑾�(shu艒)鏄庨€欎笉鏄竴鍊�(g猫)鏄庢櫤鐨勯伕鎿�.鍦ㄦ敼閫�(j矛n)鐨勫績鐞嗚伈瀛�(xu茅)妯″瀷涓�锛孎(xi脿n)FT閬�(y霉n)绠楀悗骞朵笉绔嬪嵆鎻涚畻鍒板皪(du矛)鏁�(sh霉)鍩燂紝鑰屾槸鐢ㄥ垎娈垫姌绶氶€艰繎绶氭€у煙鐨勬帺钄芥晥鎳�(y墨ng)鏇茬窔.鐐虹啊(ji菐n)鍠捣瑕�(ji脿n)锛屼娇鐢ㄨ垏妯�(bi膩o)婧�(zh菙n)涓€鑷寸殑鍒嗘鏂规硶.閫艰繎閲囩敤鍙栨寚鏁�(sh霉)鐨勫闋�(xi脿ng)寮忓睍闁�(k膩i)鐨勪竴娆￠爡(xi脿ng)鐨勬柟娉曪紝閫欑ó鏂规硶闆栫劧姣旇純绮楃硻锛屼絾姝ｅ鍓嶉潰鍒嗘瀽鐨勯偅妯�锛岃伈瀛�(xu茅)妯″瀷鍦�16bit瀹氶粸(di菐n)瀵�(sh铆)鐝�(xi脿n)鏅�(sh铆)涓嶆槸涓昏鐭涚浘锛屽洜鑰岄倓鏄彲浠ユ帴鍙楃殑. 寰楀埌鎺╄斀闁€(m茅n)闄愪互鍚�锛岀偤瑷�(j矛)绠椾俊鎺╂瘮渚涙瘮鐗瑰垎閰嶄娇鐢紝閭勬槸闇€瑕佸緸绶氭€у煙杞�(zhu菐n)鎻涘埌灏�(du矛)鏁�(sh霉)鍩�.閫欐檪(sh铆)锛屾垜鍊戦噰鐢ㄤ竴绋埄鐢ˋDSP-2181绉讳綅鍣ㄧ殑杩戜技瑷�(j矛)绠楁柟娉�.閫氶亷(gu貌)EXP鎸囦护锛屽彲浠ユ彁鍙�2閫�(j矛n)鍒惰(b菙)纰煎皬鏁�(sh霉)鐨勬寚鏁�(sh霉)锛屽皪(du矛)鑳介噺鑰岃█鍙堟湁1bit绱�3dB.鍥犺€屾寚鏁�(sh霉)鍊间箻3灏辫繎浼煎緱鍒拌┎瑁�(b菙)纰煎皬鏁�(sh霉)鐨刣B鍊�锛屽熬鏁�(sh霉)閮ㄥ垎鐨勫奖闊垮拷鐣ヤ笉瑷�(j矛). 锛�4锛夋瘮渚嬪洜瀛愮殑绶ㄧ⒓銆€MPEG鑱查煶绶ㄧ⒓妯�(bi膩o)婧�(zh菙n)涓竴鍏辩郸鍑轰簡63鍊�(g猫)姣斾緥鍥犲瓙锛屼絾鏄苟涓嶆槸鎵€鏈夐€欎簺姣斾緥鍥犲瓙閮藉彲浠ョ敤16bit鐨�2閫�(j矛n)鍒舵暩(sh霉)琛ㄧず.濡傛灉鐢ㄩ洐瀛楅€�(j矛n)琛岀簿搴︽摯(ku貌)灞�锛屽湪閲忓寲鏅�(sh铆)鍙堝皣闈㈣嚚闆欏瓧闄ゆ硶鐨勫法澶ч枊(k膩i)閵�(xi膩o)锛屽洜姝�锛屽彧浣跨敤鍏朵腑鍙互鐢�16bit鐨�2閫�(j矛n)鍒惰(b菙)纰煎皬鏁�(sh霉)绮剧⒑琛ㄧず鐨勫瓙闆嗭紝鍗冲簭铏�(h脿o)鐐�3鐨勫€嶆暩(sh霉)涓斿皬浜庣瓑浜�45 鐨勬瘮渚嬪洜瀛�. 閲囩敤姣斾緥鍥犲瓙瀛愰泦鍚�锛屾瘮渚嬪洜瀛愮法纰煎氨鍙互涓嶅啀閫氶亷(gu貌)姣旇純鐨勬柟娉曞緱鍒�锛岃€屽彲浠ョ洿鎺ラ€氶亷(gu貌)瑷�(j矛)绠楀瓙甯舵渶澶у箙搴︾殑鎸囨暩(sh霉)鐛插緱锛岀啊(ji菐n)鍖栦簡姣斾緥鍥犲瓙鐨勭法纰�. 锛�5锛夎粺浠朵豢鐪熺祼(ji茅)鏋溿€€绲�(ji茅)鍚堜笂杩板悇闋�(xi脿ng)绠楁硶鏀归€�(j矛n)锛屾牴鎿�(j霉)ADSP-2181鐨勭壒榛�(di菐n)鍜孧PEG妯�(bi膩o)婧�(zh菙n)锛岀敤AD鍏徃鐨勯枊(k膩i)鐧�(f膩)杌熶欢閫�(j矛n)琛屼簡杌熶欢浠跨湡.琛�1鍒楀嚭浜嗕豢鐪熷緱鍒扮殑鍚勫€�(g猫)妯″灏�(du矛)閬�(y霉n)绠楅噺鍜屽瓨鍎�(ch菙)閲忚姹傞€�(j矛n)琛岀殑浼扮畻绲�(ji茅)鏋�.浠跨湡鍦ㄦ娊妯ｇ巼鐐�48kHz锛岀法纰兼ā寮忕偤绔嬮珨鑱�锛岃几鍏ヤ俊铏�(h脿o)鐐洪牷鐜囩偤1kHz鐨勬寮︽尝锛岃几鍑虹⒓鐜囩偤 192kbit/s鐨勬儏娉佷笅閫�(j矛n)琛�. 鐢辫〃1鍙煡锛孉DSP-2181鐨勬€ц兘寰楀埌浜嗚純鍏呭垎鐨勫埄鐢�.浠跨湡绲�(ji茅)鏋滆〃鏄�锛屽湪浠ヤ笂鐨勬浠朵笅锛岃В纰艰几鍑虹殑淇″櫔姣斿彲閬�(d谩)80dB宸﹀彸.鍙(ji脿n)锛屾墍浣滅殑绠楁硶鏀归€�(j矛n)鏄瘮杓冩湁鏁堢殑. [align=center] 琛�1銆€鍚勬ā濉婄殑閬�(y霉n)绠楅噺鍜屽瓨鍎�(ch菙)閲忚姹俒/align] 4銆€纭欢瑷�(sh猫)瑷�(j矛) 纭欢绲�(ji茅)妲�(g貌u)妗嗗湒濡傚湒3鎵€绀�.鍚勬ā濉婄殑鍩烘湰鍔熻兘濡備笅 DSP鏍革細闄ゅ畬鎴愭墍鏈夌法纰肩畻娉曚互澶�锛岄倓瑕佸畬鎴愬皪(du矛)妯℃暩(sh霉)杞�(zhu菐n)鎻涢浕璺殑鍒濆鍖栭厤缃�锛涢€氶亷(gu貌)杓斿姪鎺у埗闆昏矾閬告搰鎶芥ǎ鏅�(sh铆)閻�锛岄€氶亷(gu貌)鎺ュ彛闆昏矾鎺ュ彈涓绘(j墨)鐨勭法纰煎弮鏁�(sh霉). 杓斿姪鎺у埗闆昏矾锛氱敱FPGA鍙婇檮灞浕璺(sh铆)鐝�(xi脿n)锛屽畬鎴愭檪(sh铆)閻樼殑鐢�(ch菐n)鐢�銆丗IFO鐙€鎱�(t脿i)鐨勭洠(ji膩n)娓�(c猫)銆佸湴鍧€璀⒓绛夊姛鑳�. 杓稿嚭绶╂矕锛氱法纰肩⒓娴佺殑鏆檪(sh铆)瀛樺劜(ch菙)鍗€(q奴)锛屽悓鏅�(sh铆)鎻愪緵瀹屽叏鐣版鐨勮几鍑烘帴鍙ｆ柟寮�.鍦ㄩ渶瑕佸(sh铆)鐝�(xi脿n)鍦栬薄鑱查煶鍞囧舰鍚屾鐨勬噳(y墨ng)鐢ㄤ腑鐗瑰垾鏈夌敤. 澶栭儴瀛樺劜(ch菙)鍣細鍖呮嫭BDMA绌洪枔銆両/O绌洪枔. 妯℃暩(sh霉)杞�(zhu菐n)鎻涢浕璺細瀹屾垚鑱查煶鐨勬暩(sh霉)瀛楀寲锛岀洿鎺ヨ垏DSP鐨勪覆鍙�0閫ｆ帴.鎶芥ǎ闋荤巼鐢卞閮ㄦ彁渚涚殑256鍊嶆娊妯ｆ檪(sh铆)閻樼殑闋荤巼姹哄畾锛屾甯稿伐浣滃墠闇€瑕侀€�(j矛n)琛屽垵濮嬪寲. 鎺ュ彛闆昏矾锛氭帴鍙ｉ浕璺垎鐐哄叐閮ㄥ垎锛屼竴閮ㄥ垎鏄法纰艰几鍑烘帴鍙�锛屽彟涓€閮ㄥ垎鏄垏涓绘(j墨)閫ｆ帴鐨勬帴鍙�.涓绘(j墨)鎺ュ彛浣跨敤RS232鎺ュ彛鑺墖瀹屾垚DSP涓插彛1鑸囦富姗�(j墨)涓插彛鐨勯€ｆ帴锛孌SP浣跨敤涓柗鍜屽収(n猫i)閮ㄨ▓(j矛)鏅�(sh铆)鍣ㄥ(sh铆)鐝�(xi脿n)鐣版涓插瀷閫氫俊. 鍙冭€冩枃鐛�(xi脿n) [1]銆€ISO/IEC 11172-3-1993銆€Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s鈥斺€攑art 3: audio [2]銆€Brandenburg K, Dehry Y F, Johnston J D, et al. ISO-MPEG-1 audio: a generic standard for coding of high-quality digital audio. J Audio Eng Soc, 1994, 42 锛�10锛�: 780锝�791 [3]銆€鐜嬪缓鏄�锛岃懀鍦ㄦ湜锛屽嵃鏃ユ柟寮�(qi谩ng)MPEG闊抽牷绶ㄧ⒓绠楁硶鐨勭爺绌惰垏瀵�(sh铆)鏅�(sh铆)瀵�(sh铆)鐝�(xi脿n)娓呰彲澶у(xu茅)瀛�(xu茅)鍫�(b脿o)锛� 1997锛� 37锛�10锛夛細 45锝�48 [4]銆€Konstantinides K, Fast subband filtering in MPEG audio coding. IEEE Signal Processing Letters,銆€1994