TWI463859B - Portable electronic device - Google Patents

Description

Portable electronic device

The present invention relates to a portable electronic device, and more particularly to a portable electronic device having a noise canceling function.

Due to the continuous development of mobile communication technologies, portable electronic devices such as personal digital assistants (PDAs) and mobile phones have become indispensable communication tools in human life.

The quality of the call during use is an important indicator of the performance of the communication tool. However, the use of communication tools is often disturbed by noise in the external environment. In the case of mobile phones, it is inevitable that people use mobile phones to make calls in noisy environments. When a mobile phone user talks to a family member or a friend, the noise in the environment is mixed with the voice of the mobile phone user and transmitted to the other party. As a result, the quality of the call will be affected, and the caller cannot clearly hear the voice of the mobile phone user.

In view of the above, it is necessary to provide a portable electronic device having a noise canceling function and improving call quality.

A portable electronic device includes a body and a voice input module disposed on the body. The voice input module includes a plurality of microphones, a signal processing unit, and a voice detecting unit. The plurality of microphones pass the voice detecting unit and the signal The processing unit is electrically connected. The plurality of microphones are disposed at different positions of the body for receiving sound signals from different directions, and transmitting the received sound signals to the signal processing unit, wherein the sound signals are a mixed voice signal. The signal processing unit separates the mixed voice signal it receives into a plurality of independent voice signals. The voice detection unit identifies a specific voice signal from different voice signals.

Compared with the prior art, the portable electronic device inputs a voice signal by using a matrix microphone, and performs independent component analysis on the voice signal to remove environmental noise, leaving only the voice of the mobile phone user to speak, thereby enhancing carrying The quality of the call in a noisy environment.

100‧‧‧Portable electronic device

10‧‧‧ Ontology

11‧‧‧ main board

12‧‧‧Voice input module

121‧‧‧First microphone

123‧‧‧second microphone

125‧‧‧ third microphone

127‧‧‧Signal Processing Unit

129‧‧‧Speech detection unit

14‧‧‧Display module

16‧‧‧ keyboard

18‧‧‧Voice Output Module

19‧‧‧Antenna

1 is a perspective view of a portable electronic device according to a preferred embodiment of the present invention.

2 is a functional block diagram of a preferred embodiment of the present invention.

As shown in FIG. 1 and FIG. 2 , the portable electronic device is a mobile phone 100 , which includes a main body 10 , a main circuit board 11 , a voice input module 12 , and a display module 14 . Functional modules such as keyboard 16, voice output module 18 and antenna 19. The voice input module 12, the display module 14, the keyboard 16, the voice output module 18, and the antenna 19 are electrically connected through a main circuit board 11.

During the call, the user's voice can be input to the mobile phone 100 via the voice input module 12 and transmitted to the other party via the antenna 19. The voice input module 12 includes a plurality of microphones (see FIG. 2), a signal processing unit 127, and a voice detecting unit 129. The plurality of microphones are electrically connected to the signal processing unit 127 through the voice detecting unit 129. The plurality of microphones are disposed at different positions of the mobile phone 100 for receiving sound signals from different directions. The signal processing unit 127 includes An independent component analysis program that separates the mixed voice signal into a plurality of independent voice signals. The voice detecting unit 129 is configured to identify a specific voice signal from different voice signals.

The display module 14 includes a liquid crystal display for displaying the content input by the keyboard 16 and the content received or output by the mobile phone 100. The keyboard 16 is used to input information. The voice output module 18 is an earpiece or a speaker for outputting a voice signal, so that the user of the mobile phone 100 can hear the voice of the other party through the voice output module 18.

In this embodiment, the voice input to the mobile phone 100 through the voice input module 12 is composed of three different independent voice signals, and the three different independent voice signals are respectively the voice signal1 of the user of the mobile phone 100, and the second of the environment. The noise source produces two kinds of noise signal2 and signal3. The plurality of microphones includes a first microphone 121, a second microphone 123, and a third microphone 125. The first microphone 121, the second microphone 123, and the third microphone 125 are arranged in an array on different positions of the mobile phone 100, and are respectively configured to receive audio signals from different directions, and transmit the received audio signals to the signal processing unit 127. . The signals received by the first microphone 121, the second microphone 123, and the third microphone 125 are voice signals mixed with the noise of the user and the environment, and are represented as Mixedsignal1, Mixedsignal2, and Mixedsignal3, respectively. The relationship between the mixed voice signals Mixedsignal1, Mixedsignal2, and Mixedsignal3 and the independent voice signals signal1, signal2, and signal3 can be expressed by the following matrix function: Mixedsignal1=X11*signal1+X12*signal2+X13*signal3(1)

Mixedsignal2=X21*signal1+X22*signal2+X23*signal3(2)

Mixedsignal3=X31*signal1+X32*signa32+X33*signal3(3)

If M is a mixed voice signal and s is an independent voice signal, the relationship between M and s can be expressed as: M=Xs(4)

Where X is a linear coefficient. It can be known from equations (1), (2), (3) and (4) that the mixed speech signal and the independent speech signal have a matrix function relationship.

Based on the matrix function relationship, the signal processing unit 127 analyzes and calculates the received three mixed voice signals Mixedsignal1, Mixedsignal2, and Mixedsignal3, and separates them into three independent voice signals signal1, signal2, and signal3. The separated three independent voice signals signal1, signal2 and signal3 are transmitted by the signal processing unit 127 to the voice detecting unit 129. Since the parameters of the different voice signals (for example, the signal-to-noise ratio) are different, the voice detecting unit 129 can identify the voice signal1 of the user of the mobile phone 100 from signal1, signal2, and signal3, and transmit it to the antenna 19, and send it to the antenna 19 The other party is called, so that the caller only hears the voice of the user of the mobile phone 100, and is protected from the noise in the environment.

It can be understood that the voice input module 12 can include two, three or more microphones. The noise in the environment is not limited to two.

The portable electronic device of the present invention uses a matrix microphone to input a voice signal, and performs independent component analysis on the voice signal to remove environmental noise, leaving only the voice of the mobile phone user to speak, thereby improving the mobile phone in a noisy environment. Call quality.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not above The equivalents of the embodiments of the present invention are intended to be within the scope of the following claims.

100‧‧‧Portable electronic device

11‧‧‧ main board

12‧‧‧Voice input module

121‧‧‧First microphone

123‧‧‧second microphone

125‧‧‧ third microphone

127‧‧‧Signal Processing Unit

129‧‧‧Speech detection unit

14‧‧‧Display module

16‧‧‧ keyboard

18‧‧‧Voice Output Module

19‧‧‧Antenna

Claims (5)

A portable electronic device includes a body and a voice input module disposed on the body, wherein the voice input module comprises a plurality of microphones, a signal processing unit and a voice detecting unit, and the plurality of microphones The sound detecting unit is electrically connected to the signal processing unit, wherein the plurality of microphones are disposed at different positions of the body for receiving sound signals from different directions, and transmitting the received sound signals to the signal processing unit. The voice signal is a mixed voice signal; the signal processing unit includes an independent component analysis program for separating the mixed voice signal received by the signal processing unit into a plurality of independent voice signals; the voice detection unit is independent according to different The parameters of the voice signal identify a specific voice signal from different independent voice signals, and the portable electronic device transmits the identified specific voice signal. The portable electronic device of claim 1, wherein the portable electronic device further includes a main circuit board disposed on the main body, a display module, a keyboard, a voice output module, and an antenna. The voice input module, the display module, the keyboard, the voice output module, and the antenna are electrically connected through the main circuit board. The portable electronic device of claim 2, wherein the display module comprises a liquid crystal display. The portable electronic device of claim 2, wherein the voice output module comprises an earpiece. The portable electronic device of claim 2, wherein the voice output module comprises a speaker.