KR100856002B1 - Wireless microphone system using the multi tone signal - Google Patents

Abstract

The present invention relates to a multi-tone signal wireless microphone system, and more particularly, to prevent crosstalk generated in a channel adjacent to a channel used as a wireless microphone among channels having a transmitter when multiple wireless microphones are used simultaneously. The present invention relates to a multi-tone signal wireless microphone system in which an appropriate tone signal is arranged so that all channels of the transmitter can be used.

Therefore, the present invention has the effect that all the channels can be used by solving the confusion generated when using a plurality of channels in a narrow space of the wireless microphone system.

Multi, Tone Signal, Channel, Wireless, Microphone, System, Intermodulation Distortion

Description

Wireless Microphone System using the multi tone signal}

1 is a block diagram of a transmitter of a multi-tone signal wireless microphone system according to the present invention.

FIG. 2 is a first MCU block diagram provided in the transmitter of FIG. 1.

3 is a block diagram of a receiver of a multi-tone signal wireless microphone system according to the present invention;

4 is a second MCU block diagram provided in the receiver of FIG.

* Description of the main drawing codes *

100: transmitter 110: voice signal input unit

120: first MCU 121: first memory unit

122: tone signal extractor 123: channel information extractor

130: audio synthesis unit 140: frequency synthesis unit

200 receiver 210 filter unit

220: audio signal receiver 230: tone signal detector

240: second MCU 241: second memory unit

242: tone signal determination unit 243: tone signal setting unit

250: switch unit 260: audio output unit

The present invention relates to a multi-tone signal wireless microphone system, and more particularly, to prevent crosstalk generated in a channel adjacent to a channel used as a wireless microphone among channels having a transmitter when multiple wireless microphones are used simultaneously. The present invention relates to a multi-tone signal wireless microphone system in which an appropriate tone signal is arranged so that all channels of the transmitter can be used.

In the prior art, a wireless microphone system has a technology in which a transmitter having a plurality of channels transmits a voice signal together with channel information from a transmitter to a receiver using a channel other than a channel where crosstalk occurs.

However, the conventional technique generates harmonics that are multiples of the original frequency while the RF signal passes through the nonlinear element even when the channels used are not identical to each other when multiple microphones are used at the same time. Since cross-modulation distortion, which is an output frequency component combined with a sum and difference of frequencies, affects adjacent channels, crosstalk occurs, and there is a problem in that all channels included in the transmitter cannot be used by the crosstalk.

For example, since the transmitter having 58 channels does not use all 58 channels due to the crosstalk and uses only some channels where no crosstalk occurs, the wireless microphone system is less efficient and the wireless microphone system is used to use the 58 channels. This problem of enlargement occurs.

Accordingly, an object of the present invention is to provide a multi-tone signal wireless microphone system for smoothly using all channels of a transmitter by preventing crosstalk by adjacent channels. have.

According to an embodiment of the present invention for achieving the above object, the multi-tone signal wireless microphone system is an audio input unit for receiving a voice signal from the microphone, generates at least one tone signal in proportion to the number of channels and generates the generated tone signal A first MCU for storing a channel list generated by a channel creation program arranged for each channel, extracting a tone signal corresponding to a specific channel from the stored channel list, and extracting channel information suitable for the extracted tone signal; A transmitter comprising a voice signal synthesizer for synthesizing the extracted tone signal and the voice signal, and a modulator for modulating the synthesized tone signal / voice signal on the extracted channel information; A demodulator for demodulating the modulated signal from the transmitter to separate a voice signal suitable for channel information and a tone signal, an audio receiver for receiving the separated voice signal, and whether the separated tone signal is the same tone signal as a preset tone signal A tone signal detector for detecting and detecting a tone signal, and a channel list identical to a channel list stored in the first MCU of the transmitter is stored, a specific tone signal is set in the tone signal detector, and the same tone signal as the set tone signal is received; A second MCU that determines whether a tone signal is received, a switch unit which is turned on when the same tone signal is received from the second MCU, and a switch unit which is turned off when another tone signal is received, and a voice signal is output when the switch is turned on Characterized in that consisting of a receiving unit consisting of a voice output unit.

First, according to the present invention, the wireless microphone frequency band is legally defined as 740 MHz to 742 MHz in terms of frequency resource utilization, and the bandwidth occupied per channel is determined. Not only can the wireless microphone system be constructed, but also the wireless microphone frequency band and the occupied bandwidth can be constructed.

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

1 is a block diagram of a transmitter of a multi-tone signal wireless microphone system according to the present invention, wherein the transmitter 100 includes an audio input unit 110, a first MCU 120, a multipoint control unit, an audio synthesizer 130, and a modulation unit. The unit 140 is made.

More specifically, the audio input unit 110 of the transmitter 100 receives a voice signal from the microphone.

As shown in FIG. 2, the first MCU 120 of the transmitter 100 transmits a tone signal to the audio synthesizer 120 and transmits channel information suitable for the tone signal to the modulator 140. The first MCU 120 includes a first memory 121, a tone signal extractor 122, and a channel information extractor 123.

The first memory unit 121 of the first MCU 120 stores a channel list generated by arranging tone signals suitable for a plurality of channels.

The channel list is constructed by a channel creation program, and [Table 1] is one channel list among various channel lists that can be constructed.

TABLE 1

channel Tone signal (TONE) channel Tone signal (TONE) CH1 A CH30 B CH2 A CH31 A CH3 B CH32 A CH4 A CH33 B CH5 A CH34 B CH6 B CH35 C CH7 B CH36 C CH8 C CH37 A CH9 C CH38 A CH10 A CH39 B CH11 A CH40 A CH12 B CH41 A CH13 A CH42 B CH14 A CH43 B CH15 B CH44 C CH16 B CH45 C CH17 C CH46 B CH18 C CH47 C CH19 B CH48 C CH20 C CH49 D CH21 C CH50 D CH22 D CH51 E CH23 D CH52 D CH24 E CH53 D CH25 D CH54 E CH26 D CH55 B CH27 E CH56 C CH28 A CH57 C CH29 A CH58 D

In Table 1, A is a 40 dB tone signal, B is a 38 dB tone signal, C is a 36 dB tone signal, D is a 34 dB tone signal, and E is a 32 dB tone signal. to be.

The channel creation program for constructing the channel list as described above will be described with reference to the following embodiments.

Example

Channels 1 to 740.2 MHz, channel 2 to 740.4 MHz, channel 3 to 740.6 MHz, and channel 4 to 740.8 MHz are arranged in the same manner from channel 1 to channel 58.

Arranged as above, Intermodulation Distortion (IMD), which is a characteristic on electronic circuits, occurs.

That is, when channel 1 and channel 2 are turned on at the same time, an unwanted 740.6 MHz is generated by channel 1 and channel 2 by 200 kHz, which is a drainage component of channel 1 and channel 2, and channel 3 is channel 1 and channel even when the microphone is turned off. Since the intermodulation distortion occurs in channel 3 by 2, all 58 channels cannot be used as shown in [Table 1].

Therefore, in order to use all of them as shown in [Table 1], the tone signals different from the tone signals of the channel 1 and the channel 2 generating the intermodulation distortion are arranged in the channel 3.

As a result, as shown in Table 1, an A tone signal is placed in a channel 1 of 740.2 MHz, an A tone signal is placed in a channel 2 of 740.4 MHz, and a B tone signal is placed in a channel 3 of 740.6 MHz. The intermodulation distortion should be generated in the channel 3 by the tone signal and the A tone signal in the channel 2, but the channel 3 does not generate the intermodulation distortion because the B tone signal different from the A tone signal is applied.

In this way, the channel creation program arranges the A tone signal using a channel that does not provide intermodulation distortion as the first group, and arranges the B tone signal using the channel where the intermodulation distortion occurs by the first group as the second group. The C tone signal is arranged using a channel in which intermodulation distortion occurs by the second group as a third group, and a channel in which intermodulation distortion occurs by the first group and the second group is referred to as a fourth group. The D tone signal is arranged, and the E tone signal is arranged using a channel in which intermodulation distortion occurs by the first group, the second group, and the third group as a fifth group.

In order to be constructed like the channel list, the number of tone signals may theoretically be from 2 to 20, but the most preferable number of tone signals is 4 or 5 for implementation reasons.

As a result, when the number of channels increases more than the above embodiment, the number of groups increases, so that the number of tone signals increases in proportion to the number of groups.

Therefore, the channel list created by the channel creation program is stored in the first memory unit 121.

The tone signal extractor 122 of the first MCU 120 extracts and extracts the tone signal corresponding to the channel changed to the ON state from the channel list stored in the first memory 121 for the channel changed to the ON state. The tone signal is transmitted to the audio synthesizer 120.

For example, when the microphone corresponding to channel 1 is changed from the OFF state to the ON state as shown in [Table 1], the tone signal extractor 122 extracts the A tone signal and the microphone corresponding to the channel 2 is in the OFF state. When the signal is changed to the ON state, the tone signal extractor 122 extracts the A tone signal. When the microphone corresponding to the channel 3 is changed from the OFF state to the ON state, the tone signal extractor 122 extracts the B tone signal. The tone signal of the A tone signal, the B tone signal, the C tone signal, the D tone signal, and the E tone signal extracted by the method is transmitted to the audio synthesizer 120.

The channel information extractor 123 of the first MCU 120 extracts channel information corresponding to the tone signal extracted by the tone signal extractor 122 and transmits the extracted channel information to the modulator 140. .

For example, when the C tone signal corresponding to channel 1 is extracted as shown in [Table 1], the channel information of channel 1 is transmitted to the modulator 140.

The audio synthesizer 120 of the transmitter synthesizes the voice signal input from the audio input unit 110 and the tone signal extracted from the tone signal extractor 122 and converts the synthesized signal into a modulator 140. send.

The modulator 140 of the transmitter is provided with a channel synthesis region corresponding to the number of channels of the channel list stored in the first memory unit 121, and the audio signal synthesized by the audio synthesis unit 120 as the channel synthesis region. The tone signal is received, and channel information suitable for the tone signal transmitted to the audio synthesizing unit 120 is received.

Accordingly, the modulator 140 modulates the voice signal and tone signal synthesized in the channel information and transmits the modulated voice signal to the receiver 200.

3 is a block diagram of a receiver of a multi-tone signal wireless microphone system according to the present invention, wherein the receiver 200 includes a demodulator 210, an audio receiver 220, a tone signal detector 230, and a second MCU 240. And a switch unit 250 and a voice output unit 260.

More specifically, the demodulator 210 of the receiver 200 receives and demodulates a signal modulated by the modulator 140 of the transmitter 100 to separate and separate a voice signal and a tone signal suitable for channel information. The audio signal is transmitted to the audio receiver 220 and the tone signal is transmitted to the tone signal detector 230.

The audio receiver 220 of the receiver 200 transmits the voice signal received from the demodulator 210 to the switch 250.

The tone signal detector 230 of the receiver 200 detects a tone signal by checking whether the received tone signal is a tone signal suitable for the tone signal set by the second MCU 240, and detects the tone signal and outputs the detected tone signal to the second MCU. Transmit to 240.

The tone signal detecting unit 230 for confirming whether the set tone signal and the appropriate tone signal is applied detects the tone signal with an IC chip called a tone decoder, and the IC chip peripheral circuit includes a detection element capable of changing the center frequency. By using the detection element, a specific tone signal is detected.

That is, when the detection element is a resistor, an alarm signal is generated only when a tone signal suitable for the resistance is input, and does not react when another tone signal is input.

Accordingly, the number of detection elements is configured in the IC chip peripheral circuit as many as the number of tone signals so that a tone signal suitable for the detection element is detected.

As illustrated in FIG. 4, the second MCU 240 of the receiver 200 includes a second memory unit 241, a tone signal setting unit 242, and a tone signal determination unit 243.

The second memory unit 241 of the second MCU 240 stores the same channel list as the channel list stored in the first memory unit 121 of the first MCU 120.

The tone signal setting unit 242 of the second MCU 240 does not always receive a predetermined tone signal with respect to the tone signal received from the transmitter 100, and as shown in [Table 1], the A tone signal and the B tone In order to receive the required tone signal from the receiver 200 by receiving the signal regardless of any signal among the signal, the C tone signal, the D tone signal, and the E tone signal, the IC chip peripheral circuit is changed to detect only a specific tone signal. The specific tone signal is set to be detected through the detection element.

The tone signal determination unit 243 of the second MCU 240 determines whether the same tone signal as the set tone signal is received or another tone signal is received.

That is, when a tone signal suitable for the tone signal set by the tone signal setting unit 242 is received, the switch unit 250 is turned on so that the voice signal received by the audio receiver 220 is output from the voice output unit 260. When a tone signal that is not suitable for the set tone signal is received, the switch unit 250 is turned off to determine that the voice signal received by the audio receiver 220 is not output.

As the switch unit 250 of the receiver 200 is turned on and off by the second MCU 240, a voice signal is output from the voice output unit 260.

The voice output unit 260 of the receiver 200 outputs a voice signal corresponding to the tone signal set through the speaker when the switch unit 250 is operated in the ON state.

As described above, the present invention can solve the interference caused when a plurality of channels are used in a narrow space when operating the wireless microphone system due to the operation of the transmitter 100 and the receiver 200.

Although the present invention has been described in detail so far, it should be apparent that the embodiments mentioned in the process are only illustrative, and not restrictive, and the present invention is provided by the following claims. Within the scope not departing from the scope of the present invention, changes in the components that can be coped evenly will fall within the scope of the present invention.

As described above, the present invention solves the interference caused when the wireless microphone system uses a plurality of channels in a narrow space, thereby enabling the use of all the plurality of channels.

Claims (8)

An audio input unit that receives a voice signal from a microphone, and stores a channel list generated by a channel creation program that generates one or more tone signals in proportion to the number of channels and arranges the generated tone signals appropriately for each channel. A first MCU for extracting a tone signal corresponding to a specific channel from a list and extracting channel information suitable for the extracted tone signal, a voice signal synthesizer for synthesizing the extracted tone signal and the voice signal, and the extracted channel A transmitter comprising a modulator for modulating the synthesized tone signal / audio signal on information; A demodulator for demodulating the modulated signal from the transmitter to separate a voice signal suitable for channel information and a tone signal, an audio receiver for receiving the separated voice signal, and whether the separated tone signal is the same tone signal as a preset tone signal A tone signal detector for detecting and detecting a tone signal, and a channel list identical to a channel list stored in the first MCU of the transmitter is stored, a specific tone signal is set in the tone signal detector, and the same tone signal as the set tone signal is received; A second MCU that determines whether a tone signal is received, a switch unit which is turned on when the same tone signal is received from the second MCU, and a switch unit which is turned off when another tone signal is received, and a voice signal is output when the switch is turned on Multi-tone signal wireless microphone system, characterized in that consisting of a receiving unit consisting of a voice output unit. The method according to claim 1, wherein the first MCU, A first memory unit for storing the channel list; A tone signal extractor for extracting a tone signal corresponding to a channel changed to an ON state from the channel list and transmitting the extracted tone signal to an audio synthesizer; And And a channel information extraction unit for extracting channel information corresponding to the extracted tone signal and transmitting the extracted channel information to a frequency synthesizer. The multi-tone signal wireless microphone system according to claim 1 or 2, wherein the channel creation program arranges tone signals of two channels that generate intermodulation distortion and other tone signals in a channel where intermodulation distortion occurs. The multi-tone signal wireless microphone system according to claim 3, wherein the channel creation program generates a channel list by arranging the channels in a number of two to twenty tone signals. The method according to claim 1, wherein the modulator, A channel synthesizing area is provided as many as the number of channels in the channel list so that the voice signal and tone signal synthesized by the audio synthesizing unit are received in the channel synthesizing region, and the channel information suitable for the tone signal transmitted to the audio synthesizing unit is received. Multi-tone signal wireless microphone system characterized in that the voice signal and the communication signal synthesized in the information is modulated. The method of claim 1, wherein the tone signal detector, A multi-tone signal wireless microphone system for detecting a specific tone signal using a detection element for changing a center frequency in a peripheral circuit of a tone decoder IC chip for detecting a tone signal. The multi-tone signal wireless microphone system of claim 6, wherein the detection element is a resistor. The method according to claim 1, wherein the second MCU, A second memory unit storing the same channel list as the channel list stored in the first memory unit of the first MCU; A tone signal setting unit configured to detect only a tone signal of a channel to be received from a channel list stored in the second memory unit; And And a tone signal determination unit configured to determine whether the same tone signal as the set tone signal is received or a different tone signal is received.

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