公开(公告)号：US11081097B2

公开(公告)日：2021-08-03

申请号：US16917085

申请日：2020-06-30

Applicant: ESS Technology, Inc.

Inventor： Christian Leth Petersen ,  Shawn William Scarlett ,  A. Martin Mallinson

IPC: G10K11/178 ,  H04R1/10

Abstract: A system and method for passively balancing electroacoustic transducers so that sounds other than the transducer's output can be detected. A transducer producing audio output based upon an input audio signal can operate in reverse to produce a signal in response to the impact of external sound upon the transducer from another source. This “reverse” or “microphone” signal represents the sound from the other source. Transducers are operated in monophonic mode, each in opposite polarity to the other thus canceling out and leaving only the microphone signal created by the transducers, i.e., a signal representing the external sound. The microphone signal can be amplified, and can be filtered and processed to identify and/or obtain various types of information about the sound received by the transducers.

公开(公告)号：US20210005175A1

公开(公告)日：2021-01-07

申请号：US16917085

申请日：2020-06-30

Applicant: ESS Technology, Inc.

Inventor： Christian Leth Petersen ,  Shawn William Scarlett ,  A. Martin Mallinson

IPC: G10K11/178 ,  H04R1/10

Abstract: A system and method for passively balancing electroacoustic transducers so that sounds other than the transducer's output can be detected. A transducer producing audio output based upon an input audio signal can operate in reverse to produce a signal in response to the impact of external sound upon the transducer from another source. This “reverse” or “microphone” signal represents the sound from the other source. Transducers are operated in monophonic mode, each in opposite polarity to the other thus canceling out and leaving only the microphone signal created by the transducers, i.e., a signal representing the external sound. The microphone signal can be amplified, and can be filtered and processed to identify and/or obtain various types of information about the sound received by the transducers.

公开(公告)号：US20170280244A1

公开(公告)日：2017-09-28

申请号：US15461071

申请日：2017-03-16

Applicant: ESS Technology, Inc.

Inventor： Shawn William Scarlett ,  Peter John Frith

IPC: H04R5/04 ,  H04R29/00

CPC classification number: H04R5/04 ,  H04R5/033 ,  H04R29/001 ,  H04R2420/01 ,  H04R2420/05 ,  H04R2499/11

Abstract: 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.