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1. 发明授权

US11445307B2 Personal communication device as a hearing aid with real-time interactive user interface 有权
公开(公告)号：US11445307B2
公开(公告)日：2022-09-13
申请号：US17272507
申请日：2019-08-30
申请人： Indian Institute of Technology Bombay
发明人： Prem Chand Pandey , Nitya Tiwari , Saketh Sharma
IPC分类号： H04R25/00 , G06F3/16
摘要： Hearing aids for persons with sensorineural hearing loss aim to compensate for degraded speech perception caused by frequency-dependent elevation of hearing thresholds, reduced dynamic range, abnormal loudness growth, and increased temporal and spectral masking. A digital hearing aid is implemented as a smartphone application as an alternative to ASIC-based hearing aids. The implementation provides user-configurable processing for background noise suppression and dynamic range compression. Both processing blocks are implemented for real-time processing using single FFT-based analysis-synthesis. A touch-controlled graphical user interface enables the user to set and fine-tune the processing parameters in an interactive and real-time mode.

2. 发明申请

US20160336015A1 DYNAMIC RANGE COMPRESSION WITH LOW DISTORTION FOR USE IN HEARING AIDS AND AUDIO SYSTEMS 有权
标题翻译：用于听觉艾滋病和音频系统的低失真的动态范围压缩
公开(公告)号：US20160336015A1
公开(公告)日：2016-11-17
申请号：US15113271
申请日：2015-01-27
申请人： INDIAN INSTITUTE OF TECHNOLOGY BOMBAY
发明人： PREM CHAND PANDEY , Nitya Tiwari
IPC分类号： G10L19/022 , H04R25/00
CPC分类号： G10L19/022 , H04R25/353 , H04R25/356 , H04R25/505 , H04R2430/03
摘要： Dynamic range compression in the hearing aids is provided for restoring normal loudness of low level sounds without making the high level sounds uncomfortably loud. An apparatus along with a method using sliding-band compression is disclosed for significantly reducing the temporal and spectral distortions generally associated with the currently used single and multiband compression techniques. It; uses a frequency-dependent gain function calculated on the basis of auditory critical bandwidth based short-time power spectrum and the specified hearing thresholds, compression ratios, and attack and release times. It is realized using FFT-based analysis-synthesis and can be integrated with other FFT-based signal processing in hearing aids and audio systems.
摘要翻译：助听器中的动态范围压缩用于恢复低级声音的正常响度，而不会使高音听起来不舒服。公开了一种使用滑带压缩的方法的装置，用于显着减少通常与当前使用的单频和多频带压缩技术相关联的时间和频谱失真。它; 使用基于听觉关键带宽的短时功率谱和指定听力阈值，压缩比和攻击和释放时间计算的频率依赖增益函数。它使用基于FFT的分析合成实现，并且可以与助听器和音频系统中的其他基于FFT的信号处理集成。

3. 发明授权

US09672834B2 Dynamic range compression with low distortion for use in hearing aids and audio systems 有权
公开(公告)号：US09672834B2
公开(公告)日：2017-06-06
申请号：US15113271
申请日：2015-01-27
申请人： Indian Institute of Technology Bombay
发明人： Prem Chand Pandey , Nitya Tiwari
IPC分类号： G10L19/022 , H04R25/00
CPC分类号： G10L19/022 , H04R25/353 , H04R25/356 , H04R25/505 , H04R2430/03
摘要： Dynamic range compression in the hearing aids is provided for restoring normal loudness of low level sounds without making the high level sounds uncomfortably loud. An apparatus along with a method using sliding-band compression is disclosed for significantly reducing the temporal and spectral distortions generally associated with the currently used single and multiband compression techniques. It; uses a frequency-dependent gain function calculated on the basis of auditory critical bandwidth based short-time power spectrum and the specified hearing thresholds, compression ratios, and attack and release times. It is realized using FFT-based analysis-synthesis and can be integrated with other FFT-based signal processing in hearing aids and audio systems.

4. 发明申请

US20170032803A1 METHOD AND SYSTEM FOR SUPPRESSING NOISE IN SPEECH SIGNALS IN HEARING AIDS AND SPEECH COMMUNICATION DEVICES 审中-公开
标题翻译：用于抑制听觉艾滋病和语音通信设备中的语音信号中的噪声的方法和系统
公开(公告)号：US20170032803A1
公开(公告)日：2017-02-02
申请号：US15303435
申请日：2015-04-24
申请人： Indian Institute of Technology Bombay
发明人： Prem Chand Pandey , Nitya Tiwari
IPC分类号： G10L21/0388 , G10L21/0232 , G10L19/022
CPC分类号： G10L21/0388 , G10L19/022 , G10L21/0208 , G10L21/0232 , G10L21/0264 , H04R25/505 , H04R2225/41 , H04R2225/43 , H04R2430/03 , H04R2460/01
摘要： A method for speech enhancement in speech communication devices and more specifically in hearing aids for suppressing stationary and non-stationary background noise in the input speech signal signals is disclosed. The method uses spectral subtraction wherein the noise spectrum is updated using quantile-based estimation without voice activity detection and the quantile values are approximated by dynamic quantile tracking without involving large storage and sorting of past spectral samples. The technique permits use of a different quantile at each frequency bin for noise estimation without introducing processing overheads. The preferred embodiment uses analysis-modification-synthesis based on Fast Fourier transform (FFT) and it can be integrated with other FFT-based signal processing techniques used in the hearing aids and speech communication devices. A noise suppression system based on this method and using hardware with an audio codec and a digital signal processor chip with on-chip FFT hardware is also disclosed.
摘要翻译：公开了一种用于语音通信设备中的语音增强的方法，更具体地说在用于抑制输入语音信号信号中的静止和非静止背景噪声的助听器中。该方法使用频谱减法，其中使用基于分位数的估计来更新噪声频谱而不进行语音活动检测，并且通过动态分位数跟踪近似分位数值，而不涉及过去频谱样本的大存储和分类。该技术允许在每个频率仓上使用不同的分位数来进行噪声估计，而不引入处理开销。优选实施例使用基于快速傅里叶变换（FFT）的分析修改合成，并且可以与助听器和语音通信设备中使用的其他基于FFT的信号处理技术集成。还公开了一种基于该方法并且使用具有音频编解码器的硬件和具有片上FFT硬件的数字信号处理器芯片的噪声抑制系统。

5. 发明授权

US11031158B2 Continuously variable precision and linear floating resistor using metal-oxide-semiconductor field-effect transistors 有权
公开(公告)号：US11031158B2
公开(公告)日：2021-06-08
申请号：US16757648
申请日：2018-11-16
申请人： INDIAN INSTITUTE OF TECHNOLOGY BOMBAY
发明人： Prem Chand Pandey , Shibam Debbarma , Vikas Marla , Nitya Tiwari , Rani Holani , Dinesh Kumar Sharma
IPC分类号： H01C7/10 , H03K17/687 , H03H11/54 , H03H11/46
摘要： A circuit for realizing a precision and linear floating resistor, using MOSFET devices, is disclosed. A linear floating voltage-controlled resistor (LFVCR) is realized using a MOSFET with a gate drive means and a substrate drive means to provide a feedback of the common-mode voltage across the source-drain terminals to the gate and substrate terminals. Two such LFVCR circuits using matched MOSFET devices having independent substrates, along with an op-amp based negative feedback loop, are used to realize a continuously variable precision and linear floating resistor, whose value can be controlled by a combination of variable voltage, current, and resistor. Further embodiments are disclosed for realizing a resistor mirror circuit with multiple floating resistors, improving the linearity by using LFVCR circuits with complementary MOSFET devices, realizing a resistor with scaled-up resistance and extended voltage range, and realizing a resistor with scaled-down resistance and extended current range.

6. 发明授权

US10176824B2 Method and system for consonant-vowel ratio modification for improving speech perception 有权
公开(公告)号：US10176824B2
公开(公告)日：2019-01-08
申请号：US15121599
申请日：2015-01-27
申请人： Indian Institute of Technology Bombay
发明人： Prem Chand Pandey , Ammanath Ramakrishnan Jayan , Nitya Tiwari
IPC分类号： G10L21/0232 , G10L21/02 , G10L21/0264 , G10L21/0364 , G10L25/21 , G10L25/87
摘要： Increasing the level of the consonant segments relative to the nearby vowel segments, known as consonant-vowel ratio (CVR) modification, is reported to be effective in improving speech intelligibility by listeners in noisy backgrounds and by hearing-impaired listeners. A method along with a system for real-time CVR modification using the rate of change of spectral centroid for detection of spectral transitions is disclosed. A preferred embodiment of the invention using a 16-bit fixed point processor with on-chip FFT hardware is also presented for real-time signal processing. It can be integrated with other FFT-based signal processing in communication devices, hearing aids, and other systems for improving speech perception under adverse listening conditions.

7. 发明授权

US10032462B2 Method and system for suppressing noise in speech signals in hearing aids and speech communication devices 有权
公开(公告)号：US10032462B2
公开(公告)日：2018-07-24
申请号：US15303435
申请日：2015-04-24
申请人： Indian Institute of Technology Bombay
发明人： Prem Chand Pandey , Nitya Tiwari
IPC分类号： G10L21/02 , G10L21/0208 , G10L21/0264 , G10L21/0388 , G10L21/0232 , G10L19/022 , H04R25/00
摘要： A method for speech enhancement in speech communication devices and more specifically in hearing aids for suppressing stationary and non-stationary background noise in the input speech signal signals is disclosed. The method uses spectral subtraction wherein the noise spectrum is updated using quantile-based estimation without voice activity detection and the quantile values are approximated by dynamic quantile tracking without involving large storage and sorting of past spectral samples. The technique permits use of a different quantile at each frequency bin for noise estimation without introducing processing overheads. The preferred embodiment uses analysis-modification-synthesis based on Fast Fourier transform (FFT) and it can be integrated with other FFT-based signal processing techniques used in the hearing aids and speech communication devices. A noise suppression system based on this method and using hardware with an audio codec and a digital signal processor chip with on-chip FFT hardware is also disclosed.

8. 发明申请

US20160365099A1 METHOD AND SYSTEM FOR CONSONANT-VOWEL RATIO MODIFICATION FOR IMPROVING SPEECH PERCEPTION 审中-公开
标题翻译：用于改善语音听觉的用于换代比例的改进方法和系统
公开(公告)号：US20160365099A1
公开(公告)日：2016-12-15
申请号：US15121599
申请日：2015-01-27
申请人： INDIAN INSTITUTE OF TECHNOLOGY BOMBAY
发明人： Prem Chand Pandey , Ammanath Ramakrishnan Jayan , Nitya Tiwari
IPC分类号： G10L21/0232 , G10L25/21 , G10L25/87 , G10L21/0264 , G10L21/0364
CPC分类号： G10L21/0232 , G10L21/0205 , G10L21/0264 , G10L21/0364 , G10L25/21 , G10L25/87
摘要： Increasing the level of the consonant segments relative to the nearby vowel segments, known as consonant-vowel ratio (CVR) modification, is reported to be effective in improving speech intelligibility by listeners in noisy backgrounds and by hearing-impaired listeners. A method along with a system for real-time CVR modification using the rate of change of spectral centroid for detection of spectral transitions is disclosed. A preferred embodiment of the invention using a 16-bit fixed point processor with on-chip FFT hardware is also presented for real-time signal processing. It can be integrated with other FFT-based signal processing in communication devices, hearing aids, and other systems for improving speech perception under adverse listening conditions.
摘要翻译：据称辅音段相对于附近元音段的增加，称为辅音元音比（CVR）修改，有效提高了嘈杂背景的听众和听力受损听众的语音清晰度。公开了一种使用用于检测光谱转变的光谱中心变化率的实时CVR修改的系统的方法。使用具有片上FFT硬件的16位固定点处理器的本发明的优选实施例也被呈现用于实时信号处理。它可以与通信设备，助听器和其他系统中的其他基于FFT的信号处理集成，以改善在不利的聆听条件下的语音感知。

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