公开(公告)号：US5164980A

公开(公告)日：1992-11-17

申请号：US482649

申请日：1990-02-21

申请人： Daniel R. Bush ,  Ashok Patel

发明人： Daniel R. Bush ,  Ashok Patel

IPC分类号： G10L19/00 ,  G10L19/04 ,  H04N7/14 ,  H04N7/50 ,  H04N21/236 ,  H04N21/2368 ,  H04N21/434

CPC分类号： H04N21/2368 ,  G10L19/00 ,  H04N19/619 ,  H04N21/236 ,  H04N21/434 ,  H04N21/4341 ,  H04N7/148 ,  G10L19/04

摘要： Apparatus and method are provided for the simultaneous transmission of video information and audio information in substantially real time over an ordinary voice grade telephone line having limited bandwidth in the range of about 300-3400 Hz. Because of the limited bandwidth of the ordinary telephone line, the video and audio information are compressed before transmission thereof. Each of the video information and audio information is separately compressed, mixed together and then further compressed. After the further compression, a composite signal, which includes the mixture of video and audio information, is asynchronously transmitted over the same bandwidth of the ordinary telephone line. Upon reception, the compressed information is expanded and separate video information and audio information are reproduced for viewing and hearing by the receiving party. To reduce the size of the apparatus, application specific integrated circuits (ASICs) are employed. A state machine controller apparatus is integrated with the ASIC technology to control the transfer and storing of video information and audio information and also to control the operation of the various compression and expansion stages associated with the transmitting and receiving channels.

摘要翻译： 提供了设备和方法，用于通过具有约300-3400Hz范围内的有限带宽的普通语音级电话线实时实时传输视频信息和音频信息。 由于普通电话线的带宽有限，视频和音频信息在传输之前被压缩。 每个视频信息和音频信息被分别压缩，混合在一起然后进一步压缩。 在进一步压缩之后，包括视频和音频信息的混合的复合信号在普通电话线的相同带宽上异步发送。 在接收时，压缩信息被扩展，并且分离的视频信息和音频信息被再现以供接收方观看和听到。 为了减小装置的尺寸，采用专用集成电路（ASIC）。 状态机控制器装置与ASIC技术集成以控制视频信息和音频信息的传送和存储，并且还控制与发送和接收信道相关联的各种压缩和扩展阶段的操作。