KR20000038271A - Cellular phone having function for reducing effect on surroundings due to phone call sound - Google Patents

Abstract

PURPOSE: A cellular phone having a function for reducing an effect on surroundings due to a phone call sound is provided to prevent inconvenience of other persons caused by sounds during the phone call, by reducing or removing the phone call sounds transferred to the surroundings, but the phone call sounds being transferred to the cellular phone. CONSTITUTION: A voice amplifier(200) amplifies voice signals when voice of a cellular phone user is applied to the voice amplifier(200) via a microphone(100), and then transmits the amplified voice signals to the cellular phone of the other person via a transmitter(300). The voice amplifier(200) also inputs the amplified voice signals to an inversion and amplification unit(400), which inverts the phase of the inputted signals and amplifies them. The signals from the inversion and amplification unit(400) are output to a speaker(600) via a speaker driver(500).

Description

Handheld communication devices with the ability to reduce the effects of ambient noise from calls

The present invention is invented to prevent the sound of the call of the mobile communication to interfere with others by making the sound of the call to the mobile communication device significantly reduced or completely eliminated when the user of the mobile communication device makes a call. .

As personal mobile communication devices are spreading, there is a method of increasing the sensitivity of the microphone or increasing the gain of the amplifier so that the other party can hear loudly even if the user's voice is small to minimize the interference of the call to others. Speaking loudly can't prevent you from giving to others.

The present invention was invented to prevent the sound of a call from interfering with others when a user of a mobile communication device makes a call. By using a speaker installed separately from the receiving speaker (hereinafter referred to as offset speaker) to the outside by using a method that the user's voice and the canceled speaker's voice to cancel each other due to phase inversion.

1 is an overall configuration diagram

2 is a voice signal input from the microphone and a voice signal output through the canceling speaker

Figure 3 is an embodiment of the phase inversion and amplifier

4 illustrates an embodiment in which a canceling speaker is built in a mobile communication device;

Explanation of symbols for the main parts of the drawings

In Figure 1

100: microphone 200: voice amplifier 300: transmitter

400: phase inversion and amplification unit 500: speaker driving unit 600: offset speaker

In Figure 2

V _m (t): Audio signal input from microphone

V _s (t): Audio signal output through the offset speaker

In Figure 3

R1, R2: Resistor U1: Operational Amplifier (OP AMP)

V _i (t): Input voltage V _O (t): Output voltage

In Figure 4

1: mobile communication device

2: flip of mobile communication device

3: microphone

4: Offset Speaker

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the overall configuration, Figure 2 shows a voice signal input from the microphone and a phase inverted voice signal output through the canceling speaker, Figure 3 shows an embodiment of the phase inversion and amplification unit, Figure 4 shows an embodiment in which the offset speaker is built in the portable communication device.

Referring to the operation of the mobile communication device having the configuration of FIG. 1, when a voice of a user of the mobile communication device is input through the microphone 100, the voice signal is amplified by the voice amplifier 200 and then the transmitter 300 is operated. And transmits the voice signal to the phase inverting and amplifying unit 400 to invert the phase and amplifies the signal, and then cancels the speaker 600 through the speaker driver 500 for driving the speaker. To output Then, as shown in FIG. 2, the voice signal input from the microphone 100 and the voice signal output from the offset speaker 600 are inverted in phase with each other, thereby canceling the call sound. An embodiment of the phase inversion and amplification unit 400 is illustrated in FIG. The relationship between (t) and the output signal V _O (t) The phase is reversed and the amplification gain is determined by the resistors R1 and R2.

On the other hand, there are a number of ways to embed the offset speaker in the mobile communication device, Figure 4 shows an embodiment of the flip-type mobile communication device 1, the microphone (3) receiving the user's voice is flip (2) It is installed inside, and the offset speaker (4) is shown to be installed outside the flip (2).

According to the present invention, when a user of a mobile communication device makes a call, the sound of the call is transmitted to the other party, while the surrounding sound is significantly reduced or completely eliminated, thereby preventing the call sound of the mobile communication from disturbing others so as to freely call anywhere. Make it possible.

Claims (5)

In order not to disturb other users' voices, the amplified voice signal is transmitted through the transmitter, and the voice signal is phase-inverted and amplified and then output through the offset speaker. Mobile communication device with function to cancel voice According to claim 1, as shown in Fig. 1, the microphone 100 for receiving voice, the voice amplifier 200 for amplifying the voice signal, the transmitter 300 for transmitting the output of the voice amplifier and the signal of the voice amplifier 200 A mobile communication device having a phase inversion amplifier 400 for receiving a phase inversion and amplifying a signal at the same time, a speaker driver 500 for driving a speaker with the output signal, and an offset speaker 600. 3. The method of claim 2, wherein a delay is added to delay the output of the phase inversion amplifier 400 for a predetermined time to compensate for the time delay of the circuit. A separate voice canceling device having an input unit for receiving a voice signal input through a microphone of a portable communication device, and a phase inversion and amplifying unit for phase inverting and amplifying the signal, a driving unit for driving a speaker, and an offset speaker. The phase inversion method of claim 2, wherein the phase inversion and amplification unit is separated by frequency using an FFT without using an operational amplifier, and then the phase is inverted.