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1. 发明授权

US4081620A Sidetone control circuit for a telephone set 失效
标题翻译：用于电话机的SIDETONE控制电路
公开(公告)号：US4081620A
公开(公告)日：1978-03-28
申请号：US798786
申请日：1977-05-20
申请人： David Joel Goodman , James David Johnston , A. Michael Noll
发明人： David Joel Goodman , James David Johnston , A. Michael Noll
IPC分类号： H04M1/58
CPC分类号： H04M1/58
摘要： A controllable-gain amplifier is connected between the transmitter and receiver of a telephone set and is controlled in response to the level of the telephone user's speech so as to provide an increase in gain when the user speaks too loud and a decrease in gain when the user speaks too low. This results in a sidetone which causes the user to change his or her voice level to obtain an acceptable level of sidetone. A better-controlled user voice level is thus achieved.

2. 发明授权

US3931596A Adaptive quantizer apparatus using training mode 失效
标题翻译：自适应量化仪器采用训练模式
公开(公告)号：US3931596A
公开(公告)日：1976-01-06
申请号：US510412
申请日：1974-09-30
申请人： Allen Gersho , David Joel Goodman
发明人： Allen Gersho , David Joel Goodman
IPC分类号： H03M3/04 , H03K13/22
CPC分类号： H03M3/042
摘要： Ideally, when a signal is quantized, the range of the quantizer should be matched to the power of the signal. Disclosed herein is adaptive quantizer apparatus which utilizes a particular quantizing scheme for those communications where the power of the signal to be quantized is unknown, but remains constant for the duration of a communication. The amplitude range of an adaptive quantizer is adjusted during an initial training period to a value appropriate to the power of the applied input signal. This is accomplished by successively altering the amplitude range by a multiplicative quantity that depends upon the amplitude of the quantizer output signal and upon the time elapsed since the onset of the training period.
摘要翻译：理想情况下，当量化信号时，量化器的范围应与信号的功率相匹配。这里公开了一种自适应量化器装置，其利用特定量化方案用于那些其中待量化信号的功率未知的通信，但在通信的持续时间内保持恒定。自适应量化器的振幅范围在初始训练周期内被调整到适合所施加的输入信号的功率的值。这是通过依赖于量化器输出信号的幅度和从训练周期开始以来经过的时间的乘法量连续地改变幅度范围来实现的。

3. 发明授权

US4054863A Error detection and correction system 失效
标题翻译：错误检测和校正系统
公开(公告)号：US4054863A
公开(公告)日：1977-10-18
申请号：US745831
申请日：1976-11-29
申请人： David Joel Goodman , Raymond Steele
发明人： David Joel Goodman , Raymond Steele
IPC分类号： H04B14/04 , G06F11/00 , G08C25/00
CPC分类号： H04B14/042
摘要： An error reducing arrangement is provided for a signal receiver wherein a sequence of received signals is divided into groups and each group is partitioned into subgroups. A signal representative of the deviations among the signals of each group and a signal representative of the deviations among the signals of each subgroup of said group are generated. Responsive to a subgroup deviation signal exceeding its group deviation signal, the subgroup signals are altered to reduce the subgroup deviations. In this manner errors are reduced without affecting error free signals.
摘要翻译：为信号接收机提供了一种误差减小装置，其中接收信号的序列被分成组，每组被划分成子组。产生表示各组信号之间的偏差的信号和表示所述组的每个子组的信号之间的偏差的信号。响应于超过其组偏差信号的子组偏差信号，子组信号被改变以减少子组偏差。以这种方式，减少错误而不影响无错误信号。

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