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1. 发明申请

US20020103638A1 System for improved use of pitch enhancement with subcodebooks 有权
标题翻译：用于改进使用子代码簿进行音高增强的系统
公开(公告)号：US20020103638A1
公开(公告)日：2002-08-01
申请号：US09940904
申请日：2001-08-27
申请人： Conexant System, Inc
发明人： Yang Gao
IPC分类号： G10L011/04 , G10L021/00
CPC分类号： G10L19/265 , G10L19/08 , G10L21/0364
摘要： A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired average bit rate with the perceptual quality of the reconstructed speech. The speech compression system comprises a full-rate codec, a half-rate codec, a quarter-rate codec and an eighth-rate codec. The codecs are selectively activated based on a rate selection. In addition, the full and half-rate codec are selectively activated based on a type classification. Each codec is selectively activated to encode and decode the speech signals at different bit rates emphasizing different aspects of the speech signal to enhance overall quality of the synthesized speech. The overall quality of the system is strongly related to the excitation. In order to enhance the excitation, the system contains a fixed codebook comprising several subcodebooks. The invention reveals a way to apply a pitch enhancement efficiently and differently for different subcodebooks without using additional bits. The technique is particularly applicable to selectable mode vocoder (SMV) systems.
摘要翻译：公开了能够将语音信号编码为比特流以进行后续解码以产生合成语音的语音压缩系统。语音压缩系统通过将期望的平均比特率与重构语音的感知质量进行平衡来优化比特流消耗的带宽。语音压缩系统包括全速率编解码器，半速率编解码器，四分之一速率编解码器和八速率编解码器。基于速率选择来选择性地激活编解码器。此外，基于类型分类，全速率和半速率编解码器被选择性地激活。选择性地激活每个编解码器以以强调语音信号的不同方面的不同比特率对语音信号进行编码和解码，以增强合成语音的整体质量。系统的整体质量与激励密切相关。为了增强激励，系统包含一个固定的码本，其中包含几个子码本。本发明揭示了一种在不使用附加位的情况下，针对不同的子码本高效且不同地应用音调增强的方法。该技术特别适用于可选模式声码器（SMV）系统。

2. 发明申请

US20030097258A1 Low complexity random codebook structure 有权
公开(公告)号：US20030097258A1
公开(公告)日：2003-05-22
申请号：US10105120
申请日：2002-03-22
申请人： Conexant System, Inc.
发明人： Jes Thyssen
IPC分类号： G10L019/12
CPC分类号： G10L19/005 , G10L19/002 , G10L19/012 , G10L19/08 , G10L19/083 , G10L19/09 , G10L19/10 , G10L19/12 , G10L19/125 , G10L19/18 , G10L19/265 , G10L21/0364 , G10L2019/0005 , G10L2019/0007 , G10L2019/0011
摘要： A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding modes, an accurate representation of speech through CELP (code excited linear prediction) and other associated modeling parameters are generated for higher quality decoding and reproduction. To achieve high quality in lower bit rate encoding modes, the speech encoder departs from the strict waveform matching criteria of regular CELP coders and strives to identify significant perceptual features of the input signal. The encoder generates pluralities of codevectors from a single, normalized codevector by shifting or other rearrangement. As a result, searching speeds are enhanced, and the physical size of a codebook built from such codevectors is greatly reduced.

3. 发明申请

US20020128828A1 Injecting high frequency noise into pulse excitation for low bit rate celp 有权
标题翻译：将高频噪声注入低比特率的脉冲激励
公开(公告)号：US20020128828A1
公开(公告)日：2002-09-12
申请号：US09755441
申请日：2001-01-05
申请人： Conexant System, Inc.
发明人： Yang Gao
IPC分类号： G10L019/12 , G10L021/00
CPC分类号： G10L19/12 , G10L19/08 , G10L21/02 , G10L21/0364 , G10L2019/0005
摘要： A speech-coding system provides improved speech coding by injecting high-frequency noise into an output of a pulse codebook. A filtered noise is generated by passing a high frequency noise signal through a high pass filter. The filtered high frequency noise is injected into the pulse output of the codebook through convolution. The combined noise signal and pulse output generates a perceptually improved encoded speech signal.
摘要翻译：语音编码系统通过将高频噪声注入脉冲码本的输出来提供改进的语音编码。通过高频噪声信号通过高通滤波器产生滤波噪声。滤波后的高频噪声通过卷积注入码本的脉冲输出。组合的噪声信号和脉冲输出产生感知改进的编码语音信号。

4. 发明授权

US06078167A Voltage upconverter for portable time divisional multiple access radio 失效
标题翻译：电压上变频器，用于便携式时分多址无线电
公开(公告)号：US06078167A
公开(公告)日：2000-06-20
申请号：US47242
申请日：1998-03-24
申请人： Mark Oskowsky , Dmitriy Rozenblit
发明人： Mark Oskowsky , Dmitriy Rozenblit
IPC分类号： H02M3/07 , H02M3/158 , G05F1/10 , G05F1/40
CPC分类号： H02M3/158
摘要： A voltage upconverter circuit wherein a switching voltage regulator circuit is used to charge a capacitor from a battery during an idle interval of portable phone transmission and wherein the charged capacitor is thereafter switched in series with the battery voltage for supply to a load during signal transmission, resulting in a smaller, less expensive and more efficient voltage upconverter circuit.
摘要翻译：一种升压转换器电路，其中在便携式电话传输的空闲间隔期间使用开关电压调节器电路从电池对电容器充电，并且此后，所述充电电容器与所述电池电压串联切换以在信号传输期间供应到负载，导致更小，更便宜和更有效的电压上变频电路。

5. 发明申请

US20130287226A1 REDUCED-DELAY SUBBAND SIGNAL PROCESSING SYSTEM AND METHOD 有权
标题翻译：减少延迟信号处理系统和方法
公开(公告)号：US20130287226A1
公开(公告)日：2013-10-31
申请号：US13840302
申请日：2013-03-15
申请人： Conexant Systems, Inc.
发明人： Yair Kerner
IPC分类号： H04R3/04
CPC分类号： G10L21/0232 , G10L21/038 , G10L2021/02082 , H03H17/0213 , H04B3/20 , H04M9/082 , H04R3/04 , H04R2430/03
摘要： A method for signal processing, receiving a time domain signal having a sample-rate Fs and generating N time domain signal bands, each having a bandwidth equal to Fs/N. Receiving the N signal bands and transforming a first time domain signal band to a frequency domain at a first resolution and a second time domain signal band to the frequency domain at a second resolution, where the first resolution may be different from the second resolution. Determining one or more first filter coefficients using the frequency domain components from the first signal band and one or more second filter coefficients using the frequency domain components from the second signal band. Transforming the first and second filter coefficients from the frequency domain to a time domain. Applying the first and second time domain filter coefficients to the first and second time domain signals, respectively.
摘要翻译：一种用于信号处理的方法，接收具有采样率Fs并产生N个时域信号频带的时域信号，每个具有等于Fs / N的带宽。接收N个信号频带并以第一分辨率和第二时域信号频带将第一时域信号频带变换到频域，以第二分辨率以第二分辨率转换到频域，其中第一分辨率可以不同于第二分辨率。使用来自第一信号频带的频域分量和使用来自第二信号频带的频域分量的一个或多个第二滤波器系数来确定一个或多个第一滤波器系数。将第一和第二滤波器系数从频域转换到时域。分别将第一和第二时域滤波器系数应用于第一和第二时域信号。

6. 发明申请

US20020116182A1 Controlling a weighting filter based on the spectral content of a speech signal 有权
标题翻译：基于语音信号的频谱内容控制加权滤波器
公开(公告)号：US20020116182A1
公开(公告)日：2002-08-22
申请号：US09953470
申请日：2001-09-13
申请人： Conexant System, Inc.
发明人： Yang Gao , Huan-Yu Su
IPC分类号： G10L019/14 , G10L021/00
CPC分类号： G10L19/265 , G10L21/0364
摘要： A method for preparing a speech signal for encoding comprises determining whether the spectral content of an input speech signal is representative of a defined spectral characteristic (e.g., a defined characteristic slope). A frequency specific filter component of a weighting filter is controlled based on the determination of the spectral content of the speech signal or/and its location in the encoder. A core weighting filter component of the weighting filter may be maintained regardless of the spectral content of the speech signal.
摘要翻译：用于编制用于编码的语音信号的方法包括确定输入语音信号的频谱内容是否表示定义的频谱特性（例如，定义的特征斜率）。加权滤波器的频率特定滤波器分量基于语音信号的频谱内容的确定和/或其在编码器中的位置而被控制。无论语音信号的频谱内容如何，都可以维持加权滤波器的核心加权滤波器分量。

7. 发明授权

US06154664A Dual band cellular phone with two power amplifiers and power control circuit therefore 失效
标题翻译：双频手机具有两个功率放大器和功率控制电路
公开(公告)号：US06154664A
公开(公告)日：2000-11-28
申请号：US103897
申请日：1998-06-24
申请人： Christopher M. Chorey , Iconomos A. Koullias , Luke T. Steigerwald
发明人： Christopher M. Chorey , Iconomos A. Koullias , Luke T. Steigerwald
IPC分类号： H03F3/72 , H03G3/30 , H04B1/04 , H04B1/40 , H04B1/09
CPC分类号： H04B1/005 , H03F3/72 , H03G3/3042 , H04B1/406 , H03F2200/111 , H03F2203/7239 , H04B1/04 , H04B2001/0408
摘要： A transmitter for a cellular phone comprising an antenna and being operable at a first radio frequency band and a second radio frequency band is disclosed. The transmitter comprises a first power amplifier and a second power amplifier, one of which is active at a time. The first power amplifier has an input for a first signal at the first radio frequency band, an input for a first control signal and a first output for an amplified first signal. The first output is connectable to the antenna. The second power amplifier has an input for a second signal at the second radio frequency band, an input for a second control signal and a second output for an amplified second signal. The second output is connectable to the antenna. The transmitter further comprises a single control module associated with the first and second outputs of the power amplifiers. The control module generates a control signal for the active power amplifier. The control signal forms part of a feedback control loop, and is a function of the amplified signal output from the active power amplifier and a reference signal which defines a desired characteristic of the amplified signal.
摘要翻译：公开了一种包括天线并且可在第一无线电频带和第二无线电频带操作的蜂窝电话的发射机。发射机包括第一功率放大器和第二功率放大器，其中一个功率放大器和第二功率放大器一次处于活动状态。第一功率放大器具有用于第一无线电频带处的第一信号的输入，用于第一控制信号的输入和用于放大的第一信号的第一输出。第一个输出可连接到天线。第二功率放大器具有用于第二无线电频带处的第二信号的输入，用于第二控制信号的输入和用于放大的第二信号的第二输出。第二个输出可连接到天线。发射机还包括与功率放大器的第一和第二输出相关联的单个控制模块。控制模块产生有功功率放大器的控制信号。控制信号构成反馈控制回路的一部分，并且是从有功功率放大器输出的放大信号和限定放大信号的期望特性的参考信号的函数。

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