KR0132286Y1 - Apparatus for removing noise of wireless speaker - Google Patents

Abstract

The present invention relates to a wireless speaker noise canceller, which removes noise components from high frequency components received by mixing with various harmonics externally when transmitting audio signal of TV receiver set or audio equipment set to speaker by wireless. Only audio signal components are extracted to listen to high quality sound through the speaker.

The wireless speaker noise canceling device of the present invention extracts the voice intermediate frequency signal from the high frequency signal received from the intermediate frequency amplifier and the mixing unit on the speaker side, and the noise component of the voice signal obtained by demodulating the original signal through the voice detector. Is achieved by including noise attenuating means for attenuating and extracting only pure speech signals and outputting them to the speaker through the low frequency amplifier.

Description

Wireless speaker noise canceller

1 is a block diagram of a transceiver in a conventional wireless speaker system.

FIG. 2 is a configuration diagram showing in detail the transmitter and receiver of FIG.

3 is a block diagram of a noise canceling device in a wireless speaker system of the present invention.

* Explanation of symbols for main parts of the drawings

200: television set 201: line

202: transmitter 202a: voice signal amplifier

202b: transmission modulator 202c: power amplifier

203: first antenna 204: second antenna

205: receiver 205a: high frequency amplifier

205b: intermediate frequency amplification and mixing unit 205c: negative detector

205d: noise attenuator 205e: low frequency amplifier

207: Speaker

The present invention relates to a wireless speaker system, and more particularly, in a wireless speaker system in which a speaker is separated and used wirelessly, such as a television receiver set or an audio device. The present invention relates to a wireless speaker noise canceling device that improves sound quality by removing noise generated by various harmonics when being transmitted to an external device.

In general, a wireless speaker system is a system that allows a user to listen to a TV set or audio equipment set and a speaker by modulating a voice signal at a high frequency, and connects the audio amplifier and the speaker in a general television set or audio equipment by a wired line. Instead, it is used wirelessly.

In other words, the wireless speaker system wirelessly modulates and transmits audio signals generated from a television set and an audio device set to a high frequency without wirelessly connecting a speaker such as a television receiver set or an audio device set by wire. The high frequency signal is received at the speaker side and demodulated to the original audio signal, and then outputs the audio signal as an audible frequency through the speaker, thereby eliminating the restriction of the installation site by a general wired connection.

1 is a block diagram of a transceiver in a conventional wireless speaker system, and as shown therein, a television receiver set 100; A transmitter 102 connected to the television receiver set 100 by wire to modulate a voice signal output from the television receiver set 100 at a high frequency to be transmitted through a first antenna 103; The high frequency signal transmitted through the first antenna 103 is located at a distance or near distance from the television receiver set 100 and received through the second antenna 104 to restore the original audio signal, and the restored voice. The receiver 105 outputs a signal through a speaker 107 connected by a line 106.

In the above, the transmitting and receiving unit 102, 103, as shown in Figure 2, the amplification of the audio signal generated in the television receiver set 100 and amplified and output the audio signal input through the line 101 to a predetermined level Section 102a; A transmission modulator (102b) for modulating and outputting the voice signal amplified by the voice signal amplifier (102a) at a high frequency; The transmitter 102 is constituted by a power amplifier 102c which amplifies the high frequency signal modulated by the transmission modulator 102b to a sufficient magnitude and transmits it through the first antenna 103. A high frequency amplifier 105a for receiving the high frequency signal transmitted from the first antenna 103 through the second antenna 104 and amplifying the signal to a predetermined level; An intermediate frequency amplification and mixing unit 105b for mixing the high frequency signal amplified by the high frequency amplification unit 105a with a local oscillation frequency to detect an intermediate frequency signal; A voice detector 105c which detects the intermediate frequency signal detected by the intermediate frequency amplifier and mixer 105b and outputs it as an original voice signal; And a low frequency amplifier 105d for low frequency amplifying the voice signal obtained by the voice detector 105c and providing it to the speaker 107 through the line 106.

And, in the above, the transmitting unit 102 is included connected to the line 101 in the television receiver set 100, the receiving unit 105 is connected to the line 106 in the speaker 107, only the first, Only the second antennas 103 and 104 are installed outside the television set 100 and the speaker 107.

As described above, in the conventional wireless speaker system configured, first, when a voice signal corresponding to a broadcast signal from the television receiver set 100 is input to the transmitter 102 through the line 101, the transmitter 102 inputs the voice signal. Is modulated to a high frequency and power amplified and transmitted through the first antenna 103.

In other words, the transmitter 102 includes a voice signal amplifier 102a, a transmit modulator 102b, and a power amplifier 102c as shown in FIG.

The voice signal amplifier 102 amplifies the voice signal input through the line 101 from the television receiver set 100 to a sufficient magnitude and provides it to the transmission modulator 102b.

The transmission modulator 102b modulates the amplified and input voice signal at a high frequency and provides the power amplification unit 102c to the power amplifier 102c. The antenna 103 is transmitted to the public network.

In addition, the second antenna 104 toward the speaker 107 installed wirelessly at a remote or near position with the television receiver set 100 receives the high frequency signal transmitted to the public network and provides it to the receiver 105.

The receiving unit 105 detects the original audio signal from the high frequency signal input through the second antenna 104 and provides it to the speaker 107 through the line 106.

That is, the receiver 105 includes a high frequency amplifier 105a, an intermediate frequency amplifier and mixer 105b, a voice detector 105c and a low frequency amplifier 105d as shown in FIG.

The high frequency amplification unit 105a amplifies the high frequency signal received through the second antenna 104 to a sufficient magnitude to provide the intermediate frequency amplification and mixing unit 105b.

The intermediate frequency amplification and mixing unit 105b detects the speech intermediate frequency signal by mixing the amplified input high frequency signal with its own local oscillation frequency, and the detected speech intermediate frequency signal is originally transmitted through the speech detector 105c. The demodulated signal is provided to the low frequency amplifier 105d.

The low frequency amplifier 105d amplifies the demodulated and input voice signal to a sufficient size to output the voice signal through the line 106 and the speaker 107.

However, such a conventional wireless speaker system is characterized in that the audio signal is transmitted and listened wirelessly between the television set and the speaker, but this is an external harmonic signal, an example irrespective of the audio signal transmitted from the television set. As a result, various noise signals, such as satellite broadcasting signals and cordless telephones, are received through the second antenna on the speaker side and output to the speaker side as it is, so that the listener cannot hear the pure audio signal of the television set or the audio device set and includes noise. There was a problem in that the audio signal must be listened to.

Therefore, in view of the above problems, the present invention eliminates noise components from the high frequency components received by mixing with various harmonics externally when the audio signal of the television set or the audio equipment is transmitted to the speaker wirelessly. And it provides a wireless speaker noise canceling device to extract only the pure voice signal components to listen to only high quality sound through the speaker.

The wireless speaker noise canceling device of the present invention for achieving the above object is composed of a filter for extracting only the pure voice signal components of 20KHz or less, and the voice intermediate from the high frequency signal received from the intermediate frequency amplifier and the mixing unit on the speaker side. And attenuating means for extracting the sub-frequency signal and demodulating the original signal through the voice detector to attenuate the noise components and extracting only the pure voice signal to output to the speaker through the low frequency amplifier. .

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

3 is a block diagram of a noise canceling device in a wireless speaker system according to the present invention. As shown in FIG. 3, the audio signal generated by the television receiver set 200 and input through the line 201 is amplified and output to a predetermined level. An audio signal amplifier 202a; A transmission modulator 202b for modulating and outputting the voice signal amplified by the voice signal amplifier 202a at a high frequency; A power amplifier 202c for power amplifying the high frequency signal modulated by the transmission modulator 202b to a sufficient magnitude and transmitting the same through a first antenna 203; A high frequency amplifying unit (205a) having a low frequency transmission unit (202) and receiving a high frequency signal transmitted from the first antenna (203) of the transmitting unit (202) through a second antenna (204) and amplifying the signal to a predetermined level; An intermediate frequency amplifier and mixer 205b for mixing a high frequency signal amplified by the high frequency amplifier 205a and its local oscillation frequency to detect a voice intermediate frequency signal; A voice detector (205c) for detecting the intermediate frequency signal detected by the intermediate frequency amplifier and mixer (205b) and outputting it as an original voice signal; A noise attenuator 205d configured to extract only pure voice signal components of 20 KHz or less, trapping noise components among the voice signals input from the voice detector 205c, and extracting and outputting only pure voice signals; A low frequency amplifying unit 205e for removing low noise components from the noise attenuating unit 205d and amplifying the pure audio signal components inputted to the speaker 207 through a line 206; The receiver 105 is configured.

Referring to Figure 3 a preferred embodiment of the present invention configured as described above in more detail as follows.

First, when a voice signal of a broadcast signal is detected from the television receiver set 200 and input to the voice signal amplifier 202a included in the transmitter 202 through the line 101, the voice signal amplifier 202 The amplifier sufficiently amplifies the audio signal of the input broadcast signal to the set gain value and outputs it to the transmission modulator 202b.

The transmission modulator 202b modulates the voice signal amplified by the voice signal amplifier 202a into its own local oscillation frequency and outputs it to the power amplifier 202c. The power amplifier 202c outputs the power amplifier 202c. In the transmission modulator 202b, the high frequency signal modulated by the local oscillation frequency is amplified and transmitted to the public network through the first antenna 203.

The second antenna 204 on the side of the speaker 207, which is installed wirelessly at a remote or short-range location with the television receiver set 200, receives the high frequency signal transmitted to the public network and is provided in the receiving unit 205. The high frequency amplifier 205a is provided.

The high frequency amplifying unit 205a included in the receiving unit 205 amplifies the high frequency signal received through the second antenna 204 to a sufficient size by a set gain value and outputs the amplified high frequency signal to the intermediate frequency amplifying and mixing unit 205b. .

The intermediate frequency amplification and mixing unit 205b mixes a high frequency signal amplified by the high frequency amplification unit 205a with an input high frequency signal and a local oscillation frequency generated by itself to detect a voice intermediate frequency signal and detect the same. The voice intermediate frequency signal is provided to the voice detector 205c.

The voice detector 205c extracts the original modulated voice signal from the input voice intermediate frequency signal and provides the same to the noise attenuator 205d.

In this case, a voice signal including external noise may be output to the signal output from the voice detector 205c.

In other words, the first antenna 203 on the television receiver set 200 modulates the voice signal into a high frequency signal and transmits the voice signal to the public network, and the second antenna 204 on the speaker 207 side exists in the public network. In the public network, various harmonic signals, for example, satellite components, noise components of various high frequency signals such as radio telephones are present in the public network, mixed with high frequency signals transmitted from the first antenna 203, The amplifier 205a, the intermediate frequency amplifier and mixer 205b, and the voice detector 205c are sequentially transmitted to the noise attenuator 205d.

Accordingly, the noise attenuator 205d traps the voice signal component including the noise component among the voice signal components detected and input by the voice detector 205c, and the voice corresponding to the broadcast signal of the pure television receiver set 200. Only the signal component is extracted and provided to the low frequency amplifier 205e.

In other words, since the frequency band that human can hear is 20KHz, it is possible to remove the ambient noise by using a filter that removes the higher frequency. Most of the surrounding noise is a high frequency component, so it is easy to remove it with a filter.

Therefore, the noise attenuator 205d composed of a filter traps a voice signal component including a noise component, that is, a high frequency component of 20 KHz or more, from among the voice signal components detected and input by the voice detector 205c, and sets a pure television receiver set 200. Only the voice signal component corresponding to the broadcast signal, i.e., a frequency component of 20 KHz or less, which is a frequency band that can be heard, is extracted and provided to the low frequency amplifier 205e.

The low frequency amplifying unit 205e amplifies the voice signal removed from the noise attenuating unit 205d to a sufficient size by a set gain value and then outputs the same through the speaker 207.

The noise attenuator 205d is positioned between the high frequency amplifier 205e and the amplified frequency amplifier and mixer 205b without being located between the voice detector 205c and the low frequency amplifier 205e. Among the high frequency signals amplified by the unit 205a, the high frequency signals of noise components may be trapped and removed in advance, and only the high frequency signals corresponding to the pure audio signals may be provided to the intermediate frequency amplifier and mixer 205b. It is more effective to remove the noise after being detected by the voice detector 205c.

As described above, according to the wireless speaker noise canceling apparatus according to the present invention, a radio signal of a television receiver set or an audio equipment set is wirelessly transmitted to the speaker side, and is mixed with various external harmonics. By removing the noise components and extracting only the pure audio signal components and outputting them through the speaker, the listener or viewer can hear only better sound quality, thereby improving the reliability of the product.

In addition, although a specific embodiment of the present invention has been described and illustrated, it can be seen that the present invention is not limited to this because many modifications are possible.

Therefore, it is to be understood that the present invention and all modifications that come within the true spirit and scope of the principles described and claimed herein may be covered.

Claims (2)

It is composed of a filter that extracts only pure audio signal components of 20KHz or less, and extracts the voice intermediate frequency signal from the high frequency signal received from the intermediate frequency amplifier and the mixing unit on the speaker side, and demodulates the original signal through the voice detector. Wireless speaker noise canceling device comprising a noise attenuating means for outputting to the speaker through the low frequency amplification unit is composed of a low pass filter traps and removes the noise components of the speech signal components and extracts only the pure audio signal components. The high frequency signal of claim 1, wherein the noise attenuation means is provided at an intermediate stage of the intermediate frequency amplification and mixing unit to remove a noise component of 20 KHz or more from the high frequency signal amplified by the high frequency amplification unit, and to correspond to a pure voice signal component of 20 KHz or less. Wireless speaker noise canceller, characterized in that to extract the bay to provide the intermediate frequency amplification and mixing unit.