基于UG NX Post Builder软件的后处理开发环境,为i5系统AC双摆台五轴加工中心定制了专用后处理程序。以五轴机床性能检测标准件——S形试件为对象,系统验证了其后处理能力。通过Vericut软件进行多轴联动轨迹与机床运动学仿真,并结合实...基于UG NX Post Builder软件的后处理开发环境,为i5系统AC双摆台五轴加工中心定制了专用后处理程序。以五轴机床性能检测标准件——S形试件为对象,系统验证了其后处理能力。通过Vericut软件进行多轴联动轨迹与机床运动学仿真,并结合实际上机切削测试,结果表明:生成的NC程序运行平稳,无干涉、过切、欠切及系统报警。经检测,S试件轮廓精度、位置精度与表面质量均符合UG CAM设定的理论要求。该后处理功能可靠,其开发与验证方法可为其他数控系统或特种机床的后处理配置提供实践参考。展开更多
Noise feedback coding (NFC) has attracted renewed interest with the recent standardization of backward-compatible enhancements for ITU-T G.711 and G.722. It has also been revisited with the emergence of proprietary ...Noise feedback coding (NFC) has attracted renewed interest with the recent standardization of backward-compatible enhancements for ITU-T G.711 and G.722. It has also been revisited with the emergence of proprietary speech codecs, such as BV16, BV32, and SILK, that have structures different from CELP coding. In this article, we review NFC and describe a novel coding technique that optimally shapes coding noise in embedded pulse-code modulation (PCM) and embedded adaptive differential PCM (ADPCM). We describe how this new technique was incorporated into the recent ITU-T G.711.1, G.711 App. III, and G.722 Annex B (G.722B) speech-coding standards.展开更多
摘要基于UG NX Post Builder软件的后处理开发环境,为i5系统AC双摆台五轴加工中心定制了专用后处理程序。以五轴机床性能检测标准件——S形试件为对象,系统验证了其后处理能力。通过Vericut软件进行多轴联动轨迹与机床运动学仿真,并结合实际上机切削测试,结果表明:生成的NC程序运行平稳,无干涉、过切、欠切及系统报警。经检测,S试件轮廓精度、位置精度与表面质量均符合UG CAM设定的理论要求。该后处理功能可靠,其开发与验证方法可为其他数控系统或特种机床的后处理配置提供实践参考。
摘要Noise feedback coding (NFC) has attracted renewed interest with the recent standardization of backward-compatible enhancements for ITU-T G.711 and G.722. It has also been revisited with the emergence of proprietary speech codecs, such as BV16, BV32, and SILK, that have structures different from CELP coding. In this article, we review NFC and describe a novel coding technique that optimally shapes coding noise in embedded pulse-code modulation (PCM) and embedded adaptive differential PCM (ADPCM). We describe how this new technique was incorporated into the recent ITU-T G.711.1, G.711 App. III, and G.722 Annex B (G.722B) speech-coding standards.