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1.发明授权公开(公告)号：US10418044B2
公开(公告)日：2019-09-17
申请号：US15706160
申请日：2017-09-15
Inventor： Shafagh Kamkar , Dylan Hester , Bruce Duewer
IPC: G10L21/0316 , G10L19/16 , G06F3/16 , G10L19/02 , G10L19/032 , G10L19/26 , H03M5/08 , H03M5/14 , H03M5/04
Abstract: A single-bit audio stream can be converted to a modified single-bit audio stream with a constant edge rate while maintaining a modulation index of the original audio stream using direct mapping. With direct mapping, a pre-filter bank may be combined with a multi-bit symbol mapper to select symbols for the modified audio stream with a constant edge rate per symbol and the same modulation index as the original audio stream. The output of the pre-filter bank may be an audio stream with no consecutive full-scale symbols. Using the output of the pre-filter bank, a multi-bit symbol mapper may use the symbol selector to output a symbol with a constant edge rate per symbol and the same modulation index as the original signal. The symbols may be converted to an analog signal for reproduction of audio content using a transducer.
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Patent Agency Ranking
公开(公告)号：US10424311B2
公开(公告)日：2019-09-24
申请号：US15706093
申请日：2017-09-15
Inventor： Shafagh Kamkar , Bruce Duewer , Dylan Hester
Abstract: An audio processing circuit may have a first path for processing multi-bit audio signals in parallel with a second path for processing single-bit audio signals. The parallel paths may share a common input node for receiving audio data and a common output node for reproducing audio at a transducer. Each path may have a volume control for adjusting an output of the path. The audio processing circuit may determine a type of an audio signal received at the input. The path not corresponding to the detected type of the audio signal is muted, and the path corresponding to the detected type of audio signal is unmuted.
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公开(公告)号：US20180217807A1
公开(公告)日：2018-08-02
申请号：US15706215
申请日：2017-09-15
Inventor： Bruce Duewer , Dylan Hester , Shafagh Kamkar
Abstract: Audio content in a single-bit audio stream can be reproduced at a transducer by mapping the single-bit audio stream to symbols in a multi-bit audio stream. Volume control may be implemented, in part, in the digital domain and, in part, in the analog domain. In the digital domain, when converting the single-bit audio stream to a plurality of symbols, the plurality of symbols is selected based, at least in part, on audio content of the single-bit audio stream and a desired volume level. In the analog domain, when converting an analog current signal output from a current-steering DAC processing the plurality of symbols to an analog voltage signal, an analog gain value may be selected based, at least in part, on the desired volume level.
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公开(公告)号：US20180218744A1
公开(公告)日：2018-08-02
申请号：US15706093
申请日：2017-09-15
Inventor： Shafagh Kamkar , Bruce Duewer , Dylan Hester
IPC: G10L19/16 , G06F3/16 , G10L19/22 , G10L19/008
Abstract: An audio processing circuit may have a first path for processing multi-bit audio signals in parallel with a second path for processing single-bit audio signals. The parallel paths may share a common input node for receiving audio data and a common output node for reproducing audio at a transducer. Each path may have a volume control for adjusting an output of the path. The audio processing circuit may determine a type of an audio signal received at the input. The path not corresponding to the detected type of the audio signal is muted, and the path corresponding to the detected type of audio signal is unmuted.
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公开(公告)号：US10509624B2
公开(公告)日：2019-12-17
申请号：US15706215
申请日：2017-09-15
Inventor： Bruce Duewer , Dylan Hester , Shafagh Kamkar
Abstract: Audio content in a single-bit audio stream can be reproduced at a transducer by mapping the single-bit audio stream to symbols in a multi-bit audio stream. Volume control may be implemented, in part, in the digital domain and, in part, in the analog domain. In the digital domain, when converting the single-bit audio stream to a plurality of symbols, the plurality of symbols is selected based, at least in part, on audio content of the single-bit audio stream and a desired volume level. In the analog domain, when converting an analog current signal output from a current-steering DAC processing the plurality of symbols to an analog voltage signal, an analog gain value may be selected based, at least in part, on the desired volume level.
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公开(公告)号：US20180218745A1
公开(公告)日：2018-08-02
申请号：US15706160
申请日：2017-09-15
Inventor： Shafagh Kamkar , Dylan Hester , Bruce Duewer
IPC: G10L19/16 , G10L19/032 , G10L19/26 , G06F3/16 , G10L19/02
CPC classification number: G10L19/167 , G06F3/165 , G10L19/0212 , G10L19/032 , G10L19/26 , H03M5/08 , H03M5/14
Abstract: A single-bit audio stream can be converted to a modified single-bit audio stream with a constant edge rate while maintaining a modulation index of the original audio stream using direct mapping. With direct mapping, a pre-filter bank may be combined with a multi-bit symbol mapper to select symbols for the modified audio stream with a constant edge rate per symbol and the same modulation index as the original audio stream. The output of the pre-filter bank may be an audio stream with no consecutive full-scale symbols. Using the output of the pre-filter bank, a multi-bit symbol mapper may use the symbol selector to output a symbol with a constant edge rate per symbol and the same modulation index as the original signal. The symbols may be converted to an analog signal for reproduction of audio content using a transducer.
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