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Method and apparatus to enhance in-coming voice protection for mobile phone Disclosure Number: IPCOM000212353D
Publication Date: 2011-Nov-08
Document File: 6 page(s) / 139K

Publishing Venue

The Prior Art Database


This disclosure is to provide "Active" voice protection, to design infrared sensors around the speaker of mobile phone, to detect the distance between ear vs. speaker and to calculate the orientation that people put their phone, whenever potential in-coming voice leakage get happen, it gives real time warning to the user for adjustment; at the same time we allocate interferential speakers together with main speaker at each side of the mobile phone, and control them for sending negative feedback when needed. As the result, mobile users can actively protect their in-coming voice with better quality.

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Page 01 of 6

Method and apparatus to enhance in-coming voice protection for mobile phone

Background and Problem:

Current design of mobile phone doesn't designed to fit the ear shape, people use mobile at freedom orientation, so it conduct very high possibility of leaking of in-coming voice to other peoples nearby when accepting calls, which is a significant security issue when there is important in-coming voice you want to keep confidential.

The as-is approaches are mainly including: 1) Reduce leaking voice by either reduce the speaker volume or walk away from the people nearby, 2) Wearing an earphone that has better sound direction and protection.

But all above solutions is through "Passive" ways which is1) either raise the user complexity of bring additional accessories (like earphone) 2) reduce the voice clarity too, eventually it's not well addressing the problem.

Prior Art: Negative feedback amplifier

- Is an amplifier a fraction of the output of which is combined with the input so that a negative feedback opposes the original signal. The applied negative feedback improves performance (gain stability, linearity, frequency response, step response) and reduces sensitivity to parameter variations due to manufacturing or environment. Because of these advantages, negative feedback is used in this way in many amplifiers and control systems. [1]

- A popular application is the noise-cancelling or anti-noise earphone/headphone. The can reduce unwanted ambient sounds (i.e., acoustic noise) by means of active noise control based on negative feedback amplifier. This involves using one or more microphones placed near the ear, and electronic circuitry which uses the microphone signal to generate an "anti-noise" signal. When the anti-noise signal is produced by the speaker driver in the headphone, destructive interference cancels out the ambient noise as heard within the enclosed volume of the headphone[2].


Page 02 of 6

Currently, the negative feedback amplifier has not been applied to mobile phone in terms of preventing the conversation leakage from speaker...