{"id":230,"date":"2021-12-20T15:06:17","date_gmt":"2021-12-20T07:06:17","guid":{"rendered":"http:\/\/feel.name\/?p=230"},"modified":"2021-12-20T15:06:17","modified_gmt":"2021-12-20T07:06:17","slug":"%e8%af%ad%e9%9f%b3%e7%bc%96%e7%a0%81g-711-g-729","status":"publish","type":"post","link":"https:\/\/feel.name\/?p=230","title":{"rendered":"\u8bed\u97f3\u7f16\u7801G.711, G.729"},"content":{"rendered":"\n<p>1. \u8bed\u97f3\u7f16\u7801\u5206\u7c7b<br>&nbsp;&nbsp; \uff081\uff09\u6ce2\u5f62\u7f16\u7801: \u4ee5\u903c\u8fd1\u58f0\u97f3\u6ce2\u5f62\u4e3a\u76ee\u6807\uff0c\u5176\u4ee3\u8868<a target=\"_blank\" href=\"http:\/\/lib.csdn.net\/base\/datastructure\" rel=\"noreferrer noopener\">\u7b97\u6cd5<\/a>\u6709G.711,\u5176\u58f0\u97f3\u6e05\u695a\u5ea6\u597d\uff0c\u8bed\u97f3\u7684\u81ea\u7136\u5ea6\u9ad8\uff0c\u4f46\u662f\u538b\u7f29\u6548\u7387\u6bd4\u8f83\u5dee\uff0c\u5e38\u572832kbps\u4ee5\u4e0a\u3002<br>&nbsp;&nbsp; \uff082\uff09\u53c2\u6570\u7f16\u7801: \u5c06\u4eba\u7684\u58f0\u9053\u62bd\u8c61\u6210\u4e00\u4e2a\u53d1\u58f0\u6a21\u578b\uff0c\u5bf9\u8fd9\u4e2a\u6a21\u578b\u7684\u53c2\u6570\u8fdb\u884c\u7f16\u7801\uff0c\u5176\u7279\u70b9\u662f\u538b\u7f29\u6548\u7387\u9ad8\uff0c\u4f46\u662f\u81ea\u7136\u5ea6\u6bd4\u8f83\u5dee\uff0c\u80fd\u591f\u4ee5\u6781\u4f4e\u901f\u7387\u8fdb\u884c\u7f16\u7801\u3002<br>&nbsp;&nbsp; \uff083\uff09\u6ce2\u5f62\u53c2\u6570\u6df7\u5408\u7f16\u7801: \u7ed3\u5408\u4e86\u6ce2\u5f62\u7f16\u7801\u548c\u53c2\u6570\u7f16\u7801\u7684\u4f18\u70b9\uff0c\u4ee3\u8868\u7b97\u6cd5\u6709G.723, G.729\u7b49\uff0c\u80fd\u591f\u57284-16kbps\u901f\u7387\u8fdb\u884c\u9ad8\u8d28\u91cf\u8bed\u97f3\u5408\u6210\u3002<br>2. G.711<br>&nbsp;&nbsp;&nbsp; \u4e5f\u79f0\u4e3aPCM\uff08\u8109\u51b2\u7f16\u7801\u8c03\u5236\uff09\uff0c\u662f\u56fd\u9645\u7535\u4fe1\u8054\u76df\u8ba2\u5b9a\u51fa\u6765\u7684\u4e00\u5957\u8bed\u97f3\u538b\u7f29\u6807\u51c6\uff0c\u4e3b\u8981\u7528\u4e8e\u7535\u8bdd\u3002\u5b83\u4e3b\u8981\u7528\u8109\u51b2\u7f16\u7801\u8c03\u5236\u5bf9\u97f3\u9891\u91c7\u6837\uff0c\u91c7\u6837\u7387\u4e3a8k\u6bcf\u79d2\u3002\u5b83\u5229\u7528\u4e00\u4e2a 64Kbps \u672a\u538b\u7f29\u901a\u9053\u4f20\u8f93\u8bed\u97f3\u8baf\u53f7\u3002 \u8d77\u538b\u7f29\u7387\u4e3a1\uff1a2\uff0c \u5373\u628a16\u4f4d\u6570\u636e\u538b\u7f29\u62108\u4f4d\u3002G.711\u662f\u4e3b\u6d41\u7684\u6ce2\u5f62\u58f0\u97f3\u7f16\u89e3\u7801\u5668\u3002<br>&nbsp;&nbsp;&nbsp; G.711 \u6807\u51c6\u4e0b\u4e3b\u8981\u6709\u4e24\u79cd\u538b\u7f29\u7b97\u6cd5\u3002\u4e00\u79cd\u662f\u00b5-law algorithm \uff08\u53c8\u79f0often u-law, ulaw, mu-law\uff09\uff0c\u4e3b\u8981\u8fd0\u7528\u4e8e\u5317\u7f8e\u548c\u65e5\u672c\uff1b\u53e6\u4e00\u79cd\u662fA-law algorithm\uff0c\u4e3b\u8981\u8fd0\u7528\u4e8e\u6b27\u6d32\u548c\u4e16\u754c\u5176\u4ed6\u5730\u533a\u3002\u5176\u4e2d\uff0c\u540e\u8005\u662f\u7279\u522b\u8bbe\u8ba1\u7528\u6765\u65b9\u4fbf\u8ba1\u7b97\u673a\u5904\u7406\u7684\u3002\u8fd9\u4e24\u79cd\u7b97\u6cd5\u90fd\u4f7f\u7528\u4e00\u4e2a\u91c7\u6837\u7387\u4e3a8kHz\u7684\u8f93\u5165\u6765\u521b\u5efa64Kbps\u7684\u6570\u5b57\u8f93\u51fa\u3002G.711\u91c7\u7528\u4e00\u79cd\u79f0\u4e3a\u5206\u7ec4\u4e22\u5931\u9690\u85cf(PLC)\u7684\u6280\u672f\u6765\u51cf\u5c11\u4e22\u5305\u5e26\u6765\u7684\u5b9e\u9645\u5f71\u54cd\u3002\u6709\u6548\u7684\u4fe1\u53f7\u5e26\u5bbd\u5728\u9759\u9ed8\u671f\u95f4\u901a\u8fc7\u8bed\u97f3\u6d3b\u52a8\u68c0\u6d4b(VAD)\u8fd9\u4e00\u8fc7\u7a0b\u88ab\u51cf\u5c0f\u3002<\/p>\n\n\n\n<p>8KHz\u91c7\u6837\u7387 X&nbsp; 16bit\u91cf\u5316 = 128Kbps \uff0c 2:1\u538b\u7f29\u540e\u4e3a64Kbps<\/p>\n\n\n\n<p><br>3. G.729<br>&nbsp;&nbsp; G.729\u662fITU-T\u5b9a\u4e49\u7684\u97f3\u9891\u7f16\u7801\u7b97\u6cd5\uff0cframe \u53ea\u670910ms\uff0cG.729\u70b9\u5230\u70b9\u7684\u65f6\u5ef6\u4e3a25ms\uff0cG.729\u57fa\u4e8eCELP\u6a21\u5f0f\uff0c\u7528CS-ACELP\uff08Conjugate-Structure Algebraic Code Excited Linear Prediction\uff09\u65b9\u6cd5\u4ee58Kbps\u7684\u6ce2\u7279\u7387\u5bf9\u8bed\u97f3\u8fdb\u884c\u7f16\u7801\u3002<br>&nbsp;&nbsp;&nbsp; G.729 \u51e0\u4e4e\u90fd\u4f7f\u7528\u4e8e Voice over IP\uff08VoIP\uff09\uff0cG.711\u7f16\u89e3\u7801\u5668\u53ef\u5c06VoIP\u538b\u7f29\u81f3 65Kb\/s\uff0c\u4f7f\u4e4b\u53ef\u4ee5\u5728\u5c40\u57df\u7f51\u4e0a\u4f20\u8f93\u3002<br>&nbsp;<br>&nbsp;&nbsp;&nbsp; G.729\u91c7\u7528\u7684\u662f\u5171\u8f6d\u7ed3\u6784\u7684\u4ee3\u6570\u7801\u6fc0\u52b1\u7ebf\u6027\u9884\u6d4b\u7b97\u6cd5(Conjugate Structure Algebraic Code Excited Linear Prediction\uff0cCS-ACELP)\uff0c\u8fd9\u662f\u4e00\u79cd\u57fa\u4e8eCELP\u7f16\u7801\u6a21\u578b\u7684\u7b97\u6cd5\u3002\u7531\u4e8eG.729\u7f16\u7801\u5668\u80fd\u591f\u5b9e\u73b0\u5f88\u9ad8\u7684\u8bed\u97f3\u8d28\u91cf\uff08MOS\u52064.1\uff09\u548c\u5f88\u4f4e\u7684\u7b97\u6cd5\u5ef6\u65f6\uff0c\u88ab\u5e7f\u6cdb\u5730\u5e94\u7528\u4e8e\u6570\u636e\u901a\u4fe1\u7684\u5404\u4e2a\u9886\u57df\uff0c\u5982IP Phone\u548cH.323\u7cfb\u7edf\u7b49\u3002G.729\u662f\u5bf98KHz\u91c7\u683716bit\u91cf\u5316\u7684\u7ebf\u6027PCM\u8bed\u97f3\u4fe1\u53f7\u8fdb\u884c\u7f16\u7801\uff0c\u538b\u7f29\u540e\u6570\u636e\u901f\u7387\u4e3a8Kbps\uff0c\u5177\u590716:1\u7684\u9ad8\u538b\u7f29\u7387\u3002<\/p>\n\n\n\n<p>8KHz\u91c7\u6837\u7387 X&nbsp; 16bit\u91cf\u5316 = 128Kbps \uff0c 16:1\u538b\u7f29\u540e\u4e3a8Kbps<\/p>\n\n\n\n<p>4. G.723<br>&nbsp;&nbsp; G.723\u662fITU-T\u57281996\u5e74\u5236\u8ba2\u6210\u578b\u7684\u4e00\u79cd\u591a\u5a92\u4f53\u8bed\u97f3\u7f16\u89e3\u7801\u6807\u51c6\u3002G.723\u7f16\u7801\u5668\u91c7\u7528LPC\u5408\u6210\uff0d\u5206\u6790\u6cd5\u548c\u611f\u89c9\u52a0\u6743\u8bef\u5dee\u6700\u5c0f\u5316\u539f\u7406\u7f16\u7801\u3002G.723\u6807\u51c6\u53ef\u57286.3kbps\u548c5.3kbps\u4e24\u79cd\u7801\u7387\u4e0b\u5de5\u4f5c\u3002\u5bf9\u6fc0\u52b1\u4fe1\u53f7\u8fdb\u884c\u91cf\u5316\u65f6\uff0c\u9ad8\u901f\u7387\uff086.3kbps\uff09\u7f16\u7801\u5668\u7684\u6fc0\u52b1\u4fe1\u53f7\u91c7\u7528\u591a\u8109\u51b2\u6700\u5927\u4f3c\u7136\u91cf\u5316\uff08MP\u00ad-MLQ\uff09\uff0c\u4f4e\u901f\u7387\uff085.3kbps\uff09\u7f16\u7801\u5668\u7684\u6fc0\u52b1\u4fe1\u53f7\u91c7\u7528\u4ee3\u6570\u7801\u672c\u6fc0\u52b1\u7ebf\u6027\u9884\u6d4b\uff08ACELP\uff09\u3002\u5176\u4e2d\uff0c\u9ad8\u7801\u7387\u7b97\u6cd5\uff086.3kbps\uff09\u5177\u6709\u8f83\u9ad8\u7684\u91cd\u5efa\u8bed\u97f3\u8d28\u91cf\uff0c\u800c\u4f4e\u7801\u7387\u7b97\u6cd5\uff085.3kbps\uff09\u7684\u8ba1\u7b97\u590d\u6742\u5ea6\u5219\u8f83\u4f4e[1]\u3002\u4e0e\u4e00\u822c\u7684\u4f4e\u7801\u7387\u8bed\u97f3\u7f16\u7801\u7b97\u6cd5\u4e00\u6837\uff0c\u8fd9\u91cc\u7684G.723\u6807\u51c6\u91c7\u7528\u7684\u7ebf\u6027\u9884\u6d4b\u7684\u5408\u6210\u5206\u6790\u6cd5\u4e5f\u5c31\u662f\u6211\u4eec\u901a\u5e38\u6240\u8bf4\u7684Analysis-by-Synthesis\u3002<\/p>\n\n\n\n<p>5. G711 \uff0cG729\uff0cG723 \u7ebf\u8def\u5360\u591a\u5c11\u5e26\u5bbd\u95ee\u9898\u5e26\u5bbd\uff1d\u5305\u957f\u5ea6\u00d7\u6bcf\u79d2\u5305\u6570<br>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \uff1d\u5305\u957f\u5ea6\u00d7\uff081\/\u6253\u5305\u5468\u671f\uff09<br>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \uff1d\uff08Ethernet\u5934\uff0bIP\u5934\uff0bUDP\u5934\uff0bRTP\u5934\uff0b\u6709\u6548\u8f7d\u8377\uff09\u00d7\uff081\/\u6253\u5305\u5468\u671f\uff09<br>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \uff1d\uff08208bit \uff0b160bit\uff0b64bit\uff0b96bit \uff0b\u6709\u6548\u8f7d\u8377\uff09\u00d7\uff081\/\u6253\u5305\u5468\u671f\uff09<br>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \uff1d\uff08528bit\uff0b\uff08\u6253\u5305\u5468\u671f(\u79d2)\u00d7\u6bcf\u79d2\u7684\u6bd4\u7279\u6570\uff09\uff09\u00d7\uff081\/\u6253\u5305\u5468\u671f\uff09<br>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\uff1d( 528 \/ \u6253\u5305\u5468\u671f ) \uff0b \u6bcf\u79d2\u6bd4\u7279\u6570<br>\u6309\u7167\u4e0a\u9762\u7684\u8ba1\u7b97\u516c\u5f0f\uff1a<br>G711\uff1a20ms\u6253\u5305\uff0c\u5e26\u5bbd\u4e3a ( 528\/20 + 64) Kbit\/s\uff1d90.4 Kbit\/s<br>G729\uff1a20ms\u6253\u5305\uff0c\u5e26\u5bbd\u4e3a ( 528\/20 + 8 ) Kbit\/s\uff1d 34.4 Kbit\/s<br>G723\uff1a5.3k\uff0c30ms\u6253\u5305\uff0c\u5e26\u5bbd\u4e3a ( 528\/30 + 5.3 ) Kbit\/s\uff1d22.9 Kbit\/s<br>\u4e1a\u754c\u4e00\u822c\u6309\u7167\u4e0b\u8868\u63d0\u4f9b\u7684IP\u7f51\u5e26\u5bbd\u7cfb\u6570\u548c\u4ee5\u592a\u7f51\u5e26\u5bbd\u7cfb\u6570\u6765\u8bbe\u8ba1\u7f51\u7edc\u5e26\u5bbd\uff1a<br>\u7f16\u89e3\u7801\u6280\u672f\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u538b\u7f29\u901f\u7387\uff08Kbps\uff09\u00a0\u00a0\u00a0\u00a0\u6253\u5305\u5468\u671f\uff08ms\uff09\u00a0\u00a0\u00a0\u00a0IP\u7f51\u5e26\u5bbd\u7cfb\u6570\u00a0\u00a0 \u4ee5\u592a\u7f51\u5e26\u5bbd\u7cfb\u6570<br>G.711 a\/u\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 64\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a020\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.25\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.41<br>G.729 a\/b\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a020\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.38\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.54<br>G.723.1(5.3kbit\/s)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 5.3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.27\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.37<br>G.723.1(6.3Kbit\/s)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6.3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a00.25\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.36<br>H.263(384Kbit\/s)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2248384\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a06\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6.2<br>\u6ce8\uff1a\u91c7\u7528\u67d0\u79cd\u7f16\u7801\u65b9\u5f0f\u65f6\uff0c\u752864K\u4e58\u4ee5\u76f8\u5e94\u7684\u5e26\u5bbd\u7cfb\u6570\u5c31\u53ef\u4ee5\u5f97\u51fa\u5176\u5b9e\u9645\u5360\u7528\u7684\u5e26\u5bbd\u3002\u5f53\u7136\u5982\u679c\u662f\u4e2d\u7ee7\u63a5\u53e3\uff0c\u8fd8\u9700\u8981\u8003\u8651\u4fe1\u4ee4\u5360\u636e\u4e00\u5b9a\u7684\u5e26\u5bbd\uff0c\u4e00\u822c\u6309\u71672.5%\u6765\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>1\u3001\u5206\u5305\u53d1\u9001\uff0cG.711\u6bcf20ms\u6253\u5305\u4e00\u6b21\uff0cG.729\u6bcf20ms\uff0cG.723\u6bcf30ms<\/p>\n\n\n\n<p>2\u3001\u6bcf\u4e2a\u5305\u7531\u5305\u5934\u548c\u6709\u6548\u8f7d\u8377\u7ec4\u6210\uff0c\u6709\u6548\u8f7d\u8377\u5373\u97f3\u9891\u6570\u636e<\/p>\n\n\n\n<p>3\u3001\u5305\u5934\u7531\u4ee5\u4e0b\u7ec4\u6210\uff0c\u517166 Byte\uff0c528 bit<\/p>\n\n\n\n<p>Ethernet\u5934 IP\u5934 UDP\u5934 RTP\u5934<br>26 Byte 20 Byte 8 Byte 12 Byte<br>208 bit 160 bit 64 bit 96 bit<br>4\u3001G.711\u3001G.729\u3001G.723\u7684\u5bf9\u5e94\u7684\u97f3\u9891\u6570\u636e\u662f64kbps\u30018kbps\u30015.3kbps\uff08\u53e6\u4e00\u8bf46.3kbps\uff09\u3002<\/p>\n\n\n\n<p>\u6bcf\u4e2a\u5468\u671f\u6570\u636e\u6d41\u4e3a1280bps\u3001160bps\u3001159bps<\/p>\n\n\n\n<p>\u6bcf\u79d2\u6570\u636e\u6d41=\uff08\u5305\u5934+\u6bcf\u4e2a\u5468\u671f\u6570\u636e\u6d41\u91cf\uff09*\u5468\u671f\u6570\u91cf<\/p>\n\n\n\n<p>G.711 \u6bcf\u79d2\u6570\u636e\u6d41=\uff08528+1280\uff09*\uff081000\/20\uff09=90400 bps = 90.4 kbps<\/p>\n\n\n\n<p>G.729 \u6bcf\u79d2\u6570\u636e\u6d41=\uff08528+160\uff09*\uff081000\/20\uff09=34400 bps = 34.4 kbps<\/p>\n\n\n\n<p>G.723 \u6bcf\u79d2\u6570\u636e\u6d41=\uff08528+159\uff09*\uff081000\/30\uff09=22900 bps = 22.9 bps<br><\/p>\n\n\n\n<p>Mos\uff1a\u8bed\u97f3\u8d28\u91cf\u8bc4\u7ea7\uff0c\u8303\u56f4\u4ece1(\u5dee)-5\uff08\u597d\uff09<\/p>\n\n\n\n<p>\u8fd9\u91cc711\u7684mos 4.1 729\u7684mos 3.92<\/p>\n\n\n\n<p>\u4ee5\u4e0a\u4fe1\u606f\u7efc\u5408\u8d77\u6765\u5b9e\u9645\u7528\u8d77\u6765\u7684\u5e26\u5bbd\u4e3a<\/p>\n\n\n\n<p>G.711   100\u7ebf   9.04\u5146\u5e26\u5bbd<\/p>\n\n\n\n<p>G.729   100\u7ebf   3.44\u5146\u5e26\u5bbd<\/p>\n\n\n\n<p>G.723   100\u7ebf   2.29\u5146\u5e26\u5bbd<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u8bed\u97f3\u7f16\u7801\u5206\u7c7b&nbsp;&nbsp; \uff081\uff09\u6ce2\u5f62\u7f16\u7801: 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