公开(公告)号：US5010402A

公开(公告)日：1991-04-23

申请号：US524741

申请日：1990-05-17

申请人： Masakazu Nishino

发明人： Masakazu Nishino

IPC分类号： H04N7/26 ,  H04N7/30

CPC分类号： H04N19/60 ,  H04N19/30

摘要： A video signal compression apparatus in which a video signal having a non-matrix pixel arrangement is separated into a plurality of partial images each having a matrix pixel arrangement. The partial images thus separated are interpolated into those containing low-frequency components and those having high-frequency components. The partial images having low-frequency components are coded by an orthogonal transformation while those having high-frequency components are coded by a non-linear quantization or orthogonal transformation. The amount of data is adaptively assigned from the code length of the partial images having high-frequency components to those having low-frequency components, thus effectively utilizing the orthogonal transormation coding which has a great compression effect on a video signal having a non-matrix pixel arrangement. Further, by virtue of a comparatively small amount of data for the signal of high frequency region, the signal of low frequency region having a comparatively great amount of information can be assigned with a greater amount of data thereby to improve the compression efficiency.

摘要翻译： 一种视频信号压缩装置，其中具有非矩阵像素排列的视频信号被分成多个具有矩阵像素排列的部分图像。 将这样分离的部分图像内插到包含低频分量的那些图像和具有高频分量的部分图像。 具有低频分量的部分图像通过正交变换进行编码，而具有高频分量的部分图像通过非线性量化或正交变换进行编码。 从具有高频分量的部分图像的码长自适应地分配数据量，从而有效地利用对具有非矩阵的视频信号具有很大压缩效果的正交转换编码 像素排列。 此外，由于高频区域的信号的数据量相对较少，所以可以分配较大数量的信息量的低频区域的信号，从而提高压缩效率。

公开(公告)号：US4513177A

公开(公告)日：1985-04-23

申请号：US328088

申请日：1981-12-07

申请人： Masakazu Nishino ,  Hisashi Fujisaki

发明人： Masakazu Nishino ,  Hisashi Fujisaki

IPC分类号： H04M1/60 ,  H04M9/08

CPC分类号： H03G3/32 ,  H04M9/085

摘要： A loudspeaking telephone system has a voice switch circuit in which voice signals on transmission and reception speech channels are respectively detected to produce control signals, and these control signals are compared to judge the levels of the voice signals on both the speech channels so that the switching between both the channels is effected under the control of loss of variable attenuators inserted in both the speech channels. The control signals corresponding to the voice signals on both the transmission and reception speech channels are converted through analog-to-digital conversion into digital values which are suitable for arithmetic operation. The arithmetic operation is such that the losses of the variable attenuators are automatically controlled in accordance with the use conditions of the loudspeaking telephone system to minimum values which can prevent the howling, transmitting blocking and receiving blocking.

摘要翻译： 扬声电话系统具有语音切换电路，其中分别检测发送和接收语音信道上的语音信号以产生控制信号，并且比较这些控制信号以判断两个语音信道上的语音信号的电平，使得切换 在两个声道之间，在插入到两个声道中的可变衰减器的损失的控制下进行。 对应于发送和接收语音信道上的语音信号的控制信号通过模拟 - 数字转换转换成适合于算术运算的数字值。 算术运算是根据扬声电话系统的使用条件将可变衰减器的损耗自动控制到可以防止啸叫，发送阻塞和接收阻塞的最小值。