公开(公告)号：US06650662B1

公开(公告)日：2003-11-18

申请号：US09149913

申请日：1998-09-09

申请人： Charles Arnaud ,  Claude Cesaro ,  Gerard Richter

发明人： Charles Arnaud ,  Claude Cesaro ,  Gerard Richter

IPC分类号： H04J312

CPC分类号： H04M7/1295 ,  H04Q1/4575

摘要： The present invention discloses a system and a method for transmitting DTMF signals over high speed digital networks using voice compression algorithms, and particularly to a system for ensuring the integrity of DTMF signals at the destination node of a network after compression and decompression of data on a voice connection. A DTMF Detector is placed in parallel with a voice compression unit performing the compression algorithm. When a candidate DTMF signal is detected, the signal component at the higher frequency in the candidate is filtered out to eliminate the possibility of double DTMF detection at end user equipment. When the candidate DTMF signal is finally validated by the source node as representing a true DTMF signal, only the data essential for reconstituting the DTMF signal are transferred to the destination node.

摘要翻译： 本发明公开了一种使用语音压缩算法在高速数字网络上发送DTMF信号的系统和方法，特别涉及一种用于在压缩和解压缩数据之后确保网络目的地节点处的DTMF信号完整性的系统 语音连接。 DTMF检测器与执行压缩算法的语音压缩单元并行放置。 当检测到候选DTMF信号时，候选者中较高频率的信号分量被滤除，以消除终端用户设备双DTMF检测的可能性。 当候选DTMF信号最终被源节点验证为表示真正的DTMF信号时，仅将重构DTMF信号所必需的数据传送到目的地节点。

公开(公告)号：US5533118A

公开(公告)日：1996-07-02

申请号：US202615

申请日：1994-02-28

申请人： Claude Cesaro ,  Gerard Richter

发明人： Claude Cesaro ,  Gerard Richter

IPC分类号： H04M3/22 ,  G10L11/02 ,  H04Q1/46 ,  H04M1/00

CPC分类号： H04Q1/46 ,  G10L25/78 ,  G10L25/12

摘要： A method for detecting the presence of voice, single tone and dual tone signals compares a ratio r which equals the square of the maximum value of the received signal (A max) during a sampling period divided by a measure E of the energy to three different thresholds. If r is less than the first threshold (3) a single tone is indicated. If it is greater than the first but less than the second (5.2) a dual tone is indicated. If it is greater than the second, the received signal level is compared to the third threshold (-43 dB) and receipt of a voice signal is indicated if the level of the received signal exceeds this threshold.

摘要翻译： 用于检测语音，单音和双音信号的存在的方法将在采样周期期间等于接收信号的最大值（A max）的平方的比率r除以能量的测量E除以三个不同的 阈值。 如果r小于第一阈值（3），则指示单个音调。 如果它大于第一个但小于第二个（5.2），则表示双重音调。 如果大于第二阈值，则将接收信号电平与第三阈值（-43dB）进行比较，并且如果接收信号的电平超过该阈值，则指示语音信号的接收。

公开(公告)号：US5495526A

公开(公告)日：1996-02-27

申请号：US202601

申请日：1994-02-28

申请人： Claude Cesaro ,  Gerard Richter

发明人： Claude Cesaro ,  Gerard Richter

IPC分类号： H04Q1/45 ,  H04Q1/457 ,  H04M1/00

CPC分类号： H04Q1/4575

摘要： A method for detecting the presence of single tone and dual tone signals compares a ratio r which equals the square of the maximum value of the received signal (A max) during a sampling period divided by a measure E of the energy to three different thresholds. If r is less than the first threshold (3) a single tone is indicated. If it is greater than the first but less than the second (5.2) a dual tone is indicated. When a single tone is indicated the received signal is subjected to a second order autoregressive process to determine the frequency of the single tone. If a dual tone is indicated the received signal is subjected to a fourth order autoregressive process to determine the frequencies of the dual tones.

摘要翻译： 用于检测单音和双音信号的存在的方法将采样周期内的接收信号的最大值（A max）的平方除以能量的测量E除以三个不同阈值的比率r进行比较。 如果r小于第一阈值（3），则指示单个音调。 如果它大于第一个但小于第二个（5.2），则表示双重音调。 当指示单个音调时，接收的信号经受​​第二阶自回归过程以确定单音的频率。 如果指示双音，则接收的信号经受​​第四阶自回归过程以确定双音调的频率。

公开(公告)号：US5619565A

公开(公告)日：1997-04-08

申请号：US598294

申请日：1996-02-08

申请人： Claude Cesaro ,  Gerard Richter

发明人： Claude Cesaro ,  Gerard Richter

IPC分类号： H04M3/22 ,  G10L11/02 ,  H04Q1/46 ,  H04M1/00

CPC分类号： H04Q1/46 ,  G10L25/78 ,  G10L25/12

摘要： A method for detecting the presence of voice, single tone and dual tone signals compares a ratio r which equals the square of the maximum value of the received signal (A max) during a sampling period divided by a measure E of the energy to three different thresholds. If r is less than the first threshold (3), a single tone is indicated. If it is greater than the first but less than the second, the received signal level is compared to the third threshold (-43 dB) and receipt of a voice signal is indicted if the level of the received signal exceeds this threshold.

摘要翻译： 用于检测语音，单音和双音信号的存在的方法将在采样周期期间等于接收信号的最大值（A max）的平方的比率r除以能量的测量E除以三个不同的 阈值。 如果r小于第一阈值（3），则指示单个音调。 如果它大于第一但小于秒，则将接收信号电平与第三阈值（-43dB）进行比较，并且如果接收信号的电平超过该阈值则指示语音信号的接收。