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1. 发明申请

US20170111742A1 Apparatus and Method for Driving Headphones Differentially in Mobile Applications 审中-公开
公开(公告)号：US20170111742A1
公开(公告)日：2017-04-20
申请号：US15261936
申请日：2016-09-10
申请人： ESS Technology, Inc.
发明人： Dustin Dale Forman , Peter John Frith , Frederic Schrive , Hwang Soo Son
IPC分类号： H04R5/04 , H04R29/00
CPC分类号： H04R5/04 , H04R29/001 , H04R2420/01 , H04R2420/05 , H04R2499/11
摘要： An apparatus and method is disclosed for achieving improved sound quality from mobile ‘hifi’ playback devices by driving compatible headphones in ‘balanced’ or ‘differential’ mode via standard size headphone connectors on the device, while retaining full compliance with legacy jack connections and conventional headphones. When a headphone is connected, a smartphone may determine whether the headphone is one capable of accepting balanced audio signals, or one that uses a conventional 3-pole jack or a 4-pole CTIA or OMTP jack. For a headphone that accepts balanced audio signals, the four poles of a 4-pole jack are used to drive left and right audio channels, and inverted left and right audio channels. For conventional 3-pole or 4-pole jacks, switches in the smartphone adapt the audio output signals to the configuration expected by the headphone.

2. 发明申请

US20170280244A1 Switchable Four-pole Jack For Supporting Balanced Headphones and Headset Operation in Mobile Applications 审中-公开
公开(公告)号：US20170280244A1
公开(公告)日：2017-09-28
申请号：US15461071
申请日：2017-03-16
申请人： ESS Technology, Inc.
发明人： Shawn William Scarlett , Peter John Frith
IPC分类号： H04R5/04 , H04R29/00
CPC分类号： H04R5/04 , H04R5/033 , H04R29/001 , H04R2420/01 , H04R2420/05 , H04R2499/11
摘要： An approach is disclosed for achieving improved sound quality from mobile ‘hifi’ playback devices by driving compatible headphones in ‘balanced’ or ‘differential’ mode via standard size headphone connectors, while retaining full compliance with legacy jack connections and allowing use of a microphone. When a headphone is connected, a smartphone may determine whether the headphone is one capable of accepting balanced audio signals, or one that uses a conventional 4-pole CTIA or OMTP jack. For a headphone that accepts balanced audio signals, the four poles of a 4-pole jack are used to drive left and right audio channels, and inverted left and right audio channels. For conventional 4-pole jacks, switches in the smartphone adapt the audio output signals to the configuration expected by the headphone and allow the smartphone to receive input from the microphone. A switch may be used to alternate between the balanced and conventional CTIA or OMTP mode.

3. 发明授权

US09973157B2 Method and apparatus for achieving high-output signal swing from class-D amplifier 有权
公开(公告)号：US09973157B2
公开(公告)日：2018-05-15
申请号：US15261938
申请日：2016-09-10
申请人： ESS Technology, Inc.
发明人： Peter John Frith , Yongsheng Xu , A. Martin Mallinson , Robert Lynn Blair
IPC分类号： H03F3/217 , H03F3/185 , H03F1/02 , H03F1/32 , H04R3/00 , H03F3/68 , H03F3/30 , H04R3/04
CPC分类号： H03F3/2173 , H03F1/0205 , H03F1/0233 , H03F1/3205 , H03F3/185 , H03F3/217 , H03F3/2171 , H03F3/2175 , H03F3/3061 , H03F3/68 , H03F2200/03 , H04R3/00 , H04R3/04
摘要： An apparatus and method are disclosed for providing output signal swings that are greater than the supply voltage in a class-D amplifier. The amplifier circuit boosts the voltage across the amplifier load, such as a loudspeaker, by using capacitors to “charge pump” the voltage across the load and thus increase the voltage temporarily. This is done by using two or more output bridges rather than one, and connecting the bridges through the capacitors. For signals of less than the supply voltage, only an inner bridge, similar to a full bridge of the prior art, operates. For signals above the supply voltage, an outer bridge charges capacitors, which are then used to ‘boost’ the voltage on the bridge output for the short period of the Class-D switching period. Thus, only relatively small value boosting capacitors are needed, as they do not need to supply charge for very long.

4. 发明授权

US09806684B2 Method and apparatus for achieving very high-output signal swing from class-D amplifier 有权
公开(公告)号：US09806684B2
公开(公告)日：2017-10-31
申请号：US15261939
申请日：2016-09-10
申请人： ESS Technology, Inc.
发明人： Peter John Frith , Yongsheng Xu , A. Martin Mallinson , Robert Lynn Blair
IPC分类号： H03F3/217 , H03F3/185 , H03F1/02
CPC分类号： H03F3/2173 , H03F1/0205 , H03F1/0233 , H03F1/3205 , H03F3/185 , H03F3/217 , H03F3/2171 , H03F3/2175 , H03F3/3061 , H03F3/68 , H03F2200/03 , H04R3/00 , H04R3/04
摘要： An apparatus and method are disclosed for providing output signal swings that are greater than the supply voltage in a class-D amplifier. The amplifier circuit boosts the voltage across the amplifier load, such as a loudspeaker, by using capacitors to “charge pump” the voltage across the load and thus increase the voltage temporarily. This is done by using two or more output bridges rather than one, and connecting the bridges through the capacitors. For signals of less than the supply voltage, only an inner bridge, similar to a full bridge of the prior art, operates. For signals above the supply voltage, an outer bridge charges capacitors, which are then used to ‘boost’ the voltage on the bridge output for the short period of the Class-D switching period. Thus, only relatively small value boosting capacitors are needed, as they do not need to supply charge for very long.

5. 发明申请

US20170111017A1 Method and Apparatus For Achieving Very High-Output Signal Swing From Class-D Amplifier 有权
公开(公告)号：US20170111017A1
公开(公告)日：2017-04-20
申请号：US15261939
申请日：2016-09-10
申请人： ESS Technology, Inc.
发明人： Peter John Frith , Yongsheng Xu , A. Martin Mallinson , Robert Lynn Blair
IPC分类号： H03F3/217 , H03F3/185 , H03F1/02
CPC分类号： H03F3/2173 , H03F1/0205 , H03F1/0233 , H03F1/3205 , H03F3/185 , H03F3/217 , H03F3/2171 , H03F3/2175 , H03F3/3061 , H03F3/68 , H03F2200/03 , H04R3/00 , H04R3/04
摘要： An apparatus and method are disclosed for providing output signal swings that are greater than the supply voltage in a class-D amplifier. The amplifier circuit boosts the voltage across the amplifier load, such as a loudspeaker, by using capacitors to “charge pump” the voltage across the load and thus increase the voltage temporarily. This is done by using two or more output bridges rather than one, and connecting the bridges through the capacitors. For signals of less than the supply voltage, only an inner bridge, similar to a full bridge of the prior art, operates. For signals above the supply voltage, an outer bridge charges capacitors, which are then used to ‘boost’ the voltage on the bridge output for the short period of the Class-D switching period. Thus, only relatively small value boosting capacitors are needed, as they do not need to supply charge for very long.

6. 发明申请

US20160119710A1 Data Input on Audio Device Analog Output Port 有权
标题翻译：音频设备上的数据输入模拟输出端口
公开(公告)号：US20160119710A1
公开(公告)日：2016-04-28
申请号：US14920791
申请日：2015-10-22
申请人： ESS Technology, Inc.
发明人： A. Martin Mallinson , Dustin Dale Forman , Robert Lynn Blair , Peter John Frith
IPC分类号： H04R1/10
CPC分类号： H04R1/1041 , H04M1/6058 , H04R5/04 , H04R2420/09
摘要： An apparatus is disclosed for inputting digital data on the output channel(s) of an audio subsystem in an audio device, without interfering with normal operation of the audio subsystem. The described circuit includes a resistive element in parallel with the expected load device, such as a headphone or speaker. The resistive element receives a modulated digital signal from a data source or a switch, and the instantaneous current through the resistive element due to the modulated digital signal is reflected in a current feedback mechanism of the audio subsystem. Demodulation logic retrieves the digital signal from the current measured by the current feedback mechanism. A capacitor is provided to prevent the current in the resistive element from the digital signal from impacting the average DC current that the feedback mechanism uses to evaluate the load device.
摘要翻译：公开了一种用于在音频设备中的音频子系统的输出通道上输入数字数据而不干扰音频子系统的正常操作的装置。所描述的电路包括与期望的负载装置（例如耳机或扬声器）并联的电阻元件。电阻元件从数据源或开关接收调制的数字信号，并且由于调制的数字信号引起的通过电阻元件的瞬时电流被反映在音频子系统的电流反馈机制中。解调逻辑从当前反馈机制测量的电流中检索数字信号。提供电容器以防止电阻元件中的电流数字信号影响反馈机构用于评估负载装置的平均DC电流。

7. 发明申请

US20170104462A1 Method and Apparatus For Achieving Very High-Output Signal Swing From Class-D Amplifier Using Fewer Components 有权
公开(公告)号：US20170104462A1
公开(公告)日：2017-04-13
申请号：US15331857
申请日：2016-10-22
申请人： ESS Technology, Inc.
发明人： Peter John Frith , Yongsheng Xu , A. Martin Mallinson , Robert Lynn Blair
IPC分类号： H03F3/217 , H03F3/185 , H04R3/04 , H03F1/02
CPC分类号： H03F3/2173 , H03F1/0227 , H03F3/185 , H03F2200/03 , H04R3/04
摘要： An apparatus and method are disclosed for providing output signal swings that are greater than the supply voltage in a class-D amplifier. The amplifier circuit boosts the voltage across the amplifier load, such as a loudspeaker, by using capacitors to “charge pump” the voltage across the load and thus increase the voltage temporarily. This is done by using two or more output bridges rather than one, and connecting the bridges through the capacitors. For signals of less than the supply voltage, only an inner bridge, similar to a full bridge of the prior art, operates. For signals above the supply voltage, an outer bridge charges capacitors, which are then used to ‘boost’ the voltage on the bridge output for the short period of the Class-D switching period. Thus, only relatively small value boosting capacitors are needed, as they do not need to supply charge for very long.

8. 发明授权

US09462368B2 Data input on audio device analog output port 有权
标题翻译：音频设备模拟输出端口的数据输入
公开(公告)号：US09462368B2
公开(公告)日：2016-10-04
申请号：US14920791
申请日：2015-10-22
申请人： ESS Technology, Inc.
发明人： A. Martin Mallinson , Dustin Dale Forman , Robert Lynn Blair , Peter John Frith
IPC分类号： H04R1/10 , H04R29/00
CPC分类号： H04R1/1041 , H04M1/6058 , H04R5/04 , H04R2420/09
摘要： An apparatus is disclosed for inputting digital data on the output channel(s) of an audio subsystem in an audio device, without interfering with normal operation of the audio subsystem. The described circuit includes a resistive element in parallel with the expected load device, such as a headphone or speaker. The resistive element receives a modulated digital signal from a data source or a switch, and the instantaneous current through the resistive element due to the modulated digital signal is reflected in a current feedback mechanism of the audio subsystem. Demodulation logic retrieves the digital signal from the current measured by the current feedback mechanism. A capacitor is provided to prevent the current in the resistive element from the digital signal from impacting the average DC current that the feedback mechanism uses to evaluate the load device.
摘要翻译：公开了一种用于在音频设备中的音频子系统的输出通道上输入数字数据而不干扰音频子系统的正常操作的装置。所描述的电路包括与期望的负载装置（例如耳机或扬声器）并联的电阻元件。电阻元件从数据源或开关接收调制的数字信号，并且由于调制的数字信号引起的通过电阻元件的瞬时电流被反映在音频子系统的电流反馈机制中。解调逻辑从当前反馈机制测量的电流中检索数字信号。提供电容器以防止电阻元件中的电流数字信号影响反馈机构用于评估负载装置的平均DC电流。

9. 发明授权

US09793867B2 Method and apparatus for achieving very high-output signal swing from class-D amplifier using fewer components 有权
公开(公告)号：US09793867B2
公开(公告)日：2017-10-17
申请号：US15331857
申请日：2016-10-22
申请人： ESS Technology, Inc.
发明人： Peter John Frith , Yongsheng Xu , A. Martin Mallinson , Robert Lynn Blair
IPC分类号： H03F3/217 , H03F3/183 , H03F1/02 , H03F3/185 , H04R3/04
CPC分类号： H03F3/2173 , H03F1/0227 , H03F3/185 , H03F2200/03 , H04R3/04
摘要： An apparatus and method are disclosed for providing output signal swings that are greater than the supply voltage in a class-D amplifier. The amplifier circuit boosts the voltage across the amplifier load, such as a loudspeaker, by using capacitors to “charge pump” the voltage across the load and thus increase the voltage temporarily. This is done by using two or more output bridges rather than one, and connecting the bridges through the capacitors. For signals of less than the supply voltage, only an inner bridge, similar to a full bridge of the prior art, operates. For signals above the supply voltage, an outer bridge charges capacitors, which are then used to ‘boost’ the voltage on the bridge output for the short period of the Class-D switching period. Thus, only relatively small value boosting capacitors are needed, as they do not need to supply charge for very long.

10. 发明申请

US20170126187A1 Method and Apparatus For Achieving High-Output Signal Swing From Class-D Amplifier 有权
公开(公告)号：US20170126187A1
公开(公告)日：2017-05-04
申请号：US15261938
申请日：2016-09-10
申请人： ESS Technology, Inc.
发明人： Peter John Frith , Yongsheng Xu , A. Martin Mallinson , Robert Lynn Blair
IPC分类号： H03F3/185 , H04R3/00 , H03F1/02 , H03F3/217 , H03F1/32
CPC分类号： H03F3/2173 , H03F1/0205 , H03F1/0233 , H03F1/3205 , H03F3/185 , H03F3/217 , H03F3/2171 , H03F3/2175 , H03F3/3061 , H03F3/68 , H03F2200/03 , H04R3/00 , H04R3/04
摘要： An apparatus and method are disclosed for providing output signal swings that are greater than the supply voltage in a class-D amplifier. The amplifier circuit boosts the voltage across the amplifier load, such as a loudspeaker, by using capacitors to “charge pump” the voltage across the load and thus increase the voltage temporarily. This is done by using two or more output bridges rather than one, and connecting the bridges through the capacitors. For signals of less than the supply voltage, only an inner bridge, similar to a full bridge of the prior art, operates. For signals above the supply voltage, an outer bridge charges capacitors, which are then used to ‘boost’ the voltage on the bridge output for the short period of the Class-D switching period. Thus, only relatively small value boosting capacitors are needed, as they do not need to supply charge for very long.

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