公开(公告)号：US09865265B2

公开(公告)日：2018-01-09

申请号：US14732715

申请日：2015-06-06

Applicant: Apple Inc.

Inventor： Sean A. Ramprashad ,  Harvey D. Thornburg ,  Arvindh Krishnaswamy ,  Aram M. Lindahl

IPC: G10L21/00 ,  G10L15/34 ,  G10L15/20 ,  G10L15/16 ,  G10L15/02 ,  G10L21/0216

CPC classification number: G10L15/34 ,  G10L15/16 ,  G10L15/20 ,  G10L2015/022 ,  G10L2021/02166

Abstract: A speech recognition system for resolving impaired utterances can have a speech recognition engine configured to receive a plurality of representations of an utterance and concurrently to determine a plurality of highest-likelihood transcription candidates corresponding to each respective representation of the utterance. The recognition system can also have a selector configured to determine a most-likely accurate transcription from among the transcription candidates. As but one example, the plurality of representations of the utterance can be acquired by a microphone array, and beamforming techniques can generate independent streams of the utterance across various look directions using output from the microphone array.

公开(公告)号：US09672843B2

公开(公告)日：2017-06-06

申请号：US14502863

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Arvindh Krishnaswamy ,  Joseph M. Williams

IPC: G10L21/0264 ,  G10L25/18 ,  G10L19/02

CPC classification number: G10L21/0264 ,  G10L25/18

Abstract: Method of improving audio signal in the spectral domain starts by receiving audio signal that includes signals from sources including speech source and music source. Audio signal is tuned for output by sound output device. Portions of audio signal are analyzed in a spectral domain to determine whether adjustments are required. Analyzing portions of audio signal includes determining whether anomaly is present in frequency band of audio signal in spectral domain by using at least one metric. Metrics include band energy ratios, spectral centroid, spectral tilt, spectral flux, spectral variance, absolute thresholds, and relative thresholds. Audio signal is adjusted to improve audio signal in spectral domain when audio signal is determined to require adjustments. Adjusting audio signal includes adjusting values of the metric in frequency band that is determined to include anomaly to correspond to clustering of metric values for audio signal in spectral domain. Other embodiments are also described.

公开(公告)号：US09462381B2

公开(公告)日：2016-10-04

申请号：US14495819

申请日：2014-09-24

Applicant: Apple Inc.

Inventor： Arvindh Krishnaswamy ,  Joseph M. Williams

IPC: H03G3/00 ,  H04R3/00

CPC classification number: H04R3/007 ,  H04R2430/01 ,  H04R2430/03

Abstract: A multi-band audio compressor that may provide not only better and brighter sound, but also speaker protection. The multi-band audio compressor breaks an input audio signal into different frequency bands. For each band signal, a volume re-mapper translates a user preference volume level to a converted volume level based on a programmable volume curve for the band signal. For each frequency band, the band signal is processed by a gain stage and a compressor. Each gain stage applies a signal gain to the band signal based on the converted volume level. Each compressor compresses the output of the gain stage. After compression, the different frequency band signals are re-combined and the combined audio signal may then be passed to a power amplifier that is driving a speaker. Other embodiments are also described and claimed.

Abstract translation: 一种多频音频压缩器，不仅可以提供更好更亮的声音，还可以提供扬声器保护。 多频带音频压缩器将输入音频信号分解成不同的频带。 对于每个频带信号，音量重新映射器基于用于频带信号的可编程音量曲线将用户偏好音量电平转换为转换的音量电平。 对于每个频带，频带信号由增益级和压缩器处理。 每个增益级基于转换的音量电平对频带信号施加信号增益。 每个压缩机压缩增益级的输出。 在压缩之后，不同的频带信号被重新组合，并且组合的音频信号然后可以被传递到驱动扬声器的功率放大器。 还描述和要求保护其他实施例。

公开(公告)号：US20150350783A1

公开(公告)日：2015-12-03

申请号：US14495819

申请日：2014-09-24

Applicant: Apple Inc.

Inventor： Arvindh Krishnaswamy ,  Joseph M. Williams

IPC: H04R3/00

CPC classification number: H04R3/007 ,  H04R2430/01 ,  H04R2430/03

Abstract: A multi-band audio compressor that may provide not only better and brighter sound, but also speaker protection. The multi-band audio compressor breaks an input audio signal into different frequency bands. For each band signal, a volume re-mapper translates a user preference volume level to a converted volume level based on a programmable volume curve for the band signal. For each frequency band, the band signal is processed by a gain stage and a compressor. Each gain stage applies a signal gain to the band signal based on the converted volume level. Each compressor compresses the output of the gain stage. After compression, the different frequency band signals are re-combined and the combined audio signal may then be passed to a power amplifier that is driving a speaker. Other embodiments are also described and claimed.

Abstract translation: 一种多频音频压缩器，不仅可以提供更好更亮的声音，还可以提供扬声器保护。 多频带音频压缩器将输入音频信号分解成不同的频带。 对于每个频带信号，音量重新映射器基于用于频带信号的可编程音量曲线将用户偏好音量电平转换为转换的音量电平。 对于每个频带，频带信号由增益级和压缩器处理。 每个增益级基于转换的音量电平对频带信号施加信号增益。 每个压缩机压缩增益级的输出。 在压缩之后，不同的频带信号被重新组合，并且组合的音频信号然后可以被传递到驱动扬声器的功率放大器。 还描述和要求保护其他实施例。

公开(公告)号：US20150349738A1

公开(公告)日：2015-12-03

申请号：US14502918

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Arvindh Krishnaswamy ,  Joseph M. Williams

IPC: H03G3/20

CPC classification number: H03G3/32

Abstract: Method of dynamically adapting user volume input range on mobile device having global volume range starts by receiving a volume input selection from a user that is level included in user volume input range. User volume input range is a portion of global volume range. Device's processor then detects ambient noise level surrounding device and adjusts user volume input range from current portion of global volume range to different portion of global volume range based on detected ambient noise level. Volume input selection remains at the same level included in user volume input range after user volume input range is adjusted. Processor may identify sound profile that corresponds to ambient noise level being detected and adjusts user volume input range to a different portion of the global volume range based on identified sound profile. Other embodiments are also described.

Abstract translation: 在具有全局音量范围的移动设备上动态调整用户音量输入范围的方法从通过从包括在用户音量输入范围中的级别的用户接收音量输入选择开始。 用户音量输入范围是全局音量范围的一部分。 然后，设备的处理器检测围绕设备的环境噪声水平，并根据检测到的环境噪声水平将用户音量输入范围从全局音量范围的当前部分调整到全局音量范围的不同部分。 用户音量输入范围调整后，音量输入选择保持在用户音量输入范围内的相同级别。 处理器可以识别对应于正被检测到的环境噪声水平的声音简档，并且基于所识别的声音简档将用户音量输入范围调整到全局音量范围的不同部分。 还描述了其它实施例。

公开(公告)号：US20130329909A1

公开(公告)日：2013-12-12

申请号：US13790666

申请日：2013-03-08

Applicant: APPLE INC.

Inventor： Arvindh Krishnaswamy ,  Sean A. Ramprashad

IPC: H04R3/00

CPC classification number: H04R3/002 ,  G10L21/0324 ,  H04R3/00 ,  H04R5/04

Abstract: Improved systems and methods for psychoacoustic adaptive notch filtering are provided. By accounting for psychoacoustic properties of an audio signal as well as finer characteristics of noise which may be present in the audio signal (e.g., the shape of the spectral density of the noise), more effective strategies for dealing with undesirable components of the audio signal may be realized.

Abstract translation: 提供了用于心理声学自适应陷波滤波的改进的系统和方法。 通过考虑音频信号的心理声学特性以及可能存在于音频信号中的更精细的噪声特性（例如，噪声的频谱密度的形状），用于处理音频信号的不期望的分量的更有效的策略 可以实现。