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公开(公告)号：US20170330572A1
公开(公告)日：2017-11-16
申请号：US15151220
申请日：2016-05-10
Applicant: Immersion Services LLC
Inventor： James D. Johnston , Stephen White
IPC: G10L19/032
Abstract: An encoder generates quantized signal words based on a difference signal. The encoder includes an adaptive quantizer. A step size applied by the adaptive quantizer is generated in a feedback loop and based on a loading factor and quantized signal words generated by the adaptive quantizer. The encoder includes coding circuitry which generates code words based on quantized signal words generated by the adaptive quantizer. The coding circuitry generates an escape code in response to a quantized signal word not being associated with a corresponding coding code word.
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公开(公告)号：US10756755B2
公开(公告)日：2020-08-25
申请号：US15151220
申请日：2016-05-10
Applicant: Immersion Services LLC
Inventor： James D. Johnston , Stephen White
Abstract: An encoder generates quantized signal words based on a difference signal. The encoder includes an adaptive quantizer. A step size applied by the adaptive quantizer is generated in a feedback loop and based on a loading factor and quantized signal words generated by the adaptive quantizer. The encoder includes coding circuitry which generates code words based on quantized signal words generated by the adaptive quantizer. The coding circuitry generates an escape code in response to a quantized signal word not being associated with a corresponding coding code word.
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Patent Agency Ranking
公开(公告)号：US10699725B2
公开(公告)日：2020-06-30
申请号：US15151109
申请日：2016-05-10
Applicant: Immersion Services LLC
Inventor： James D. Johnston , Stephen White
Abstract: An encoder includes a low-pass filter to filter input audio signals. The low-pass filter has fixed filter coefficients. The encoder generates quantized signals based on a difference signal. The encoder includes an adaptive quantizer and a decoder to generate feedback signals. The decoder has an inverse quantizer and a predictor. The predictor has fixed control parameters which are based on a frequency response of the low-pass filter. The predictor may include a finite impulse response filter having fixed filter coefficients. The decoder may include an adaptive noise shaping filter coupled between the low-pass filter and the encoder. The adaptive noise shaping filter flattens signals within a frequency spectrum corresponding to a frequency spectrum of the low-pass filter.
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公开(公告)号：US20170330575A1
公开(公告)日：2017-11-16
申请号：US15151211
申请日：2016-05-10
Applicant: Immersion Services LLC
Inventor： James D. Johnston , Stephen White
IPC: G10L19/16 , G10L19/032 , G10L19/03
CPC classification number: H03M7/3046 , G10L19/0017 , G10L19/04
Abstract: An adaptive noise shaping filter flattens signal components below a threshold frequency range in a filtered signal to be encoded. An encoder generates quantized signals based on a difference signal and includes an adaptive quantizer and a decoder. The decoder generates feedback signals and has an inverse quantizer and a predictor. The predictor has determined control parameters based on the threshold frequency range.
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公开(公告)号：US10770088B2
公开(公告)日：2020-09-08
申请号：US15151200
申请日：2016-05-10
Applicant: Immersion Services LLC
Inventor： James D. Johnston , Stephen White
Abstract: A decoder generates decoded signals based on quantized signals. The decoder includes an inverse quantizer and a predictor circuit. The quantized signals are generated in an encoder by low-pass filtering an input signal and encoding the filtered signal using adaptive differential pulse code modulation. The predictor circuit has filter coefficients based on a frequency response of the low-pass filter used to filter the input signal.
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公开(公告)号：US20170330577A1
公开(公告)日：2017-11-16
申请号：US15151109
申请日：2016-05-10
Applicant: Immersion Services LLC
Inventor： James D. Johnston , Stephen White
IPC: G10L19/26 , G10L19/032 , H03H17/02 , G10L19/00
CPC classification number: G10L19/04 , H03M3/042 , H03M7/3046
Abstract: An encoder includes a low-pass filter to filter input audio signals. The low-pass filter has fixed filter coefficients. The encoder generates quantized signals based on a difference signal. The encoder includes an adaptive quantizer and a decoder to generate feedback signals. The decoder has an inverse quantizer and a predictor. The predictor has fixed control parameters which are based on a frequency response of the low-pass filter. The predictor may include a finite impulse response filter having fixed filter coefficients. The decoder may include an adaptive noise shaping filter coupled between the low-pass filter and the encoder. The adaptive noise shaping filter flattens signals within a frequency spectrum corresponding to a frequency spectrum of the low-pass filter.
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公开(公告)号：US20170330574A1
公开(公告)日：2017-11-16
申请号：US15151200
申请日：2016-05-10
Applicant: Immersion Services LLC
Inventor： James D. Johnston , Stephen White
CPC classification number: G10L19/26 , G10L19/0017 , G10L19/04 , H03M7/3046
Abstract: A decoder generates decoded signals based on quantized signals. The decoder includes an inverse quantizer and a predictor circuit. The quantized signals are generated in an encoder by low-pass filtering an input signal and encoding the filtered signal using adaptive differential pulse code modulation. The predictor circuit has filter coefficients based on a frequency response of the low-pass filter used to filter the input signal.
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