WO2007008041A1

WO2007008041A1 - Transmitting and receiving equipment of microphone

Info

Publication number: WO2007008041A1
Application number: PCT/KR2006/002752
Authority: WO
Inventors: Dong Jun Jung
Original assignee: Dong Jun Jung
Priority date: 2005-07-13
Filing date: 2006-07-13
Publication date: 2007-01-18
Also published as: KR200396653Y1

Abstract

The present invention relates, in general, to a transmitting and receiving apparatus for a wireless microphone. A socket is formed at one side of a transmitter and is inserted into a plug at the rear end of a microphone. The socket receives a wireless signal including a start signal. A transmission antenna is disposed at the other side of the transmitter transmits the wireless signal wirelessly. A reception antenna is disposed at the other side of a receiver and receives the wireless signal from the transmission antenna of the transmitter. A plug is formed at one side of the receiver and is inserted into a socket of a sound machine. The plug directly transfers the wireless signal. A socket at one side of the reception antenna is detachably coupled to the plug of the receiver so that the socket of the transmitter is coupled to the plug of the receiver instead of the reception antenna. Furthermore, charging can be performed with a plug of a power supply line being coupled to a power socket. Accordingly, signals can be transmitted and received wirelessly and charging can be performed freely through a simple operation of coupling a common microphone and a sound machine to the transmitter and the receiver, respectively.

Description

[DESCRIPTION]

[invention Title]

TRANSMITTING AND RECEIVING EQUIPMENT OF MICROPHONE [Technical Field] The present invention relates, in general, to a transmitting and receiving apparatus for a wireless microphone, and more particularly, to a transmitting and receiving apparatus for a wireless microphone, in which a signal applied to a transmitter coupled to the rear end of the microphone is amplified to have a stabilized frequency so as to be output as a wireless signal of a predetermined oscillating frequency, and a receiver that receives the wireless signal through two antennas amplifies a good wireless signal and transmits the received signal to a sound machine directly connected thereto, wherein batteries respectively built in the transmitter and the receiver can be used effectively while charging them by a charging circuit of the receiver during the transmission of the received signal to the sound machine. [Background Art]

In general, it is well-known that a microphone is a device that is installed in a room, an outside platform, a stage, etc., and serves to amplify an input voice signal and transfer the amplified signal to a sound machine connected thereto in a wired or wireless way, so that au audience can hear the sound through a speaker.

Furthermore, recently, there is a tendency that the microphone is frequently used since it is used even when lots of people sings a song at home and a singing room. A conventional microphone is connected to the sound machine in a wired way.

That is, as shown in FIG. 1, a transmitter 110 is detachably connected to one side of the microphone 100. One side of a cable 120 having the other side connected to the transmitter 110 is connected to a receiver 130. A plug 131 formed at one side of the receiver 130 is inserted into a socket of a sound machine (not shown) . Accordingly, a voice signal can be transferred directly to the sound machine in a wired way.

However, in the construction in which the microphone 100 and the sound machine are connected in a wired way through the conventional transmitter 110, the cable 120, and the receiver 130, it is difficult to connect the components through the cable in a wired way. It also makes a user cumbersome because he or she has to replace the cable frequently due to damaged cable or a damaged coupling portion of the cable and the microphone. [Disclosure] [Technical Problem]

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a transmitting and receiving apparatus for a wireless microphone, in which a signal applied to a transmitter to the rear of the microphone is amplified to have a stabilized frequency so as to be output as a wireless signal of a predetermined oscillating frequency, and a receiver that receives the wireless signal through two antennas amplifies a good wireless signal and transmits the signal to a sound machine directly connected thereto.

Another object of the present invention is to effectively use batteries respectively built in the transmitter and the receiver while charging them by a charging circuit of the receiver.

Still another object of the present invention is to transfer a signal based on a resistance value, which is changed as a plurality of keys for inputting the options of a microphone are selectively turned on, to a sound machine through a transmitter and a receiver. [Technical Solution]

A socket is formed at one side of a transmitter and is inserted into a plug at the rear end of a microphone. The socket receives a wireless signal including a start signal. A transmission antenna is disposed at the other side of the transmitter transmits the wireless signal wirelessly.

A reception antenna is disposed at the other side of a receiver and receives the wireless signal from the transmission antenna of the transmitter. A plug is formed at one side of the receiver and is inserted into a socket of a sound machine. The plug directly transfers the wireless signal.

A socket at one side of the reception antenna is detachably coupled to the plug of the receiver so that the socket of the transmitter is coupled to the plug of the receiver instead of the reception antenna. Furthermore, charging can be performed with a plug of a power supply line being coupled to a power socket. Accordingly, signals can be transmitted and received wirelessly and charging can be performed freely through a simple operation of coupling a common microphone and a sound machine to the transmitter and the receiver, respectively. [Advantageous Effects]

As described above, in accordance with the transmitting and receiving apparatus for a wireless microphone according to the present invention, the transmitter coupled to the rear end of the microphone amplifies a signal, stabilizes the frequency of the signal, and outputs the stabilized signal as a predetermined high frequency wireless signal. A receiver that receives the wireless signal through two antennas amplifies a good wireless signal and transfers the amplified signal to a sound machine directly coupled thereto.

Accordingly, there is an advantage in that batteries built in the transmitter and the receiver, respectively, can be effectively used while being charged by a charging circuit of the receiver, if appropriate. [Description of Drawings]

Further objects and advantages of the invention can be more fully understood from a following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram showing a state where a conventional microphone and a sound machine are connected;

FIG. 2a is a schematic diagram showing the construction of a transmitter according to the present invention/

FIG. 2b is a schematic diagram showing the construction of a receiver according to the present invention;

FIG. 3 is a schematic diagram showing a state where the transmitter and the receiver according to the present invention are charged; FIG. 4 is a block diagram showing the construction of the transmitter and the receiver according to the present invention;

FIG. 5 is a detailed circuit diagram of the transmitter according to the present invention;

FIG. 6 is a detailed circuit diagram of the receiver according to the present invention;

FIG. 7 is a circuit diagram showing the construction for recognizing a signal of a key formed in the microphone according to the present invention; and

FIG. 8 is a circuit diagram showing a state where the batteries of the transmitter and the receiver according to the present invention are charged.

[Mode for Invention] The present invention will now be described in detail with reference to the accompanying drawings.

FIGS. 2a and 2b and FIG. 3 show an external construction of the present invention.

A socket 11 is formed at one side of a transmitter 10. The socket 11 is inserted into a plug 2 at one end of a microphone 1 and receives wireless signals including a start signal .

A transmission antenna 12 for transmitting high frequency wireless signals processed therein to the other side of the transmitter 10 wirelessly.

A reception antenna 30 is disposed at the other side of a receiver 20 and receives the high frequency wireless signals from the transmission antenna 12 of the transmitter

10. The reception antenna 30 selects a signal with a good reception sensitivity, of the high frequency wireless signals received through two antennas 31 and 32 at the same time.

A plug 21 is formed at one side of the receiver 20. The plug is inserted into a socket of a sound machine (not shown) and directly transfers the wireless signals.

A socket 33 at one side of the reception antenna 30 is detachably coupled to a plug 22 formed at the other side of the receiver 20. Accordingly, the socket 11 of the transmitter 10 can be coupled to the plug 22 of the receiver 20 instead of the socket 33 of the reception antenna 30.

The microphone can be charged in a state where a plug 41 of a power supply line 40 is coupled to a power socket 23 formed at the side of the receiver 20.

FIG. 4 is a block diagram showing the construction of the transmitter and the receiver according to the present invention.

Wireless signals as well as a start signal are transmitted through the socket 11 of the transmitter 10, which is inserted into the plug 2 at the rear end of the microphone 1.

A first start signal that has passed through the socket 11 from the microphone 1 is transmitted to a transmitter battery 19 of a switching unit 13. The first start indicates that the microphone 1 is being used. The wireless signals that have passed through the plug 11 are input to a microphone input compressor 14 in which a low signal is amplified high and a high signal is amplified low.

The wireless signals amplified in the microphone input compressor 14 are amplified to a proper level in a pre- amplifier 15.

The wireless signals amplified in the pre-amplifier 15 are input to a FM modulator 16 to which power is input according to the start signal. Therefore, frequency modulation in which the amplitude of a carrier from an oscillator is varied according to the frequency of a signal is performed.

The wireless signals whose frequency has been modulated in the FM modulator 16 are input to a phase locked loop (PLL) 17a of a frequency stabilization circuit 17, thus obtaining a stabilized oscillation output of a frequency that is divided by a DC negative feedback circuit in the same manner as the frequency of a reference signal.

The wireless signals whose noise has been eliminated while moving from the PLL 17a to a filter 17b are compared with an oscillating frequency from a voltage-controlled oscillator (VCO) 17c that outputs a desired oscillating frequency based on a voltage.

The frequency of the oscillating frequency from the voltage-controlled oscillator 17c, which has been divided by a divider 17d, is phased-locked to a reference frequency in the PLL 17a, thus obtaining a stabilized oscillation output.

The wireless signals whose frequency has been stabilized by the frequency stabilization circuit 17 are output as high frequency wireless signals through the transmission antenna 12 via an oscillation and transmission circuit 18.

Meanwhile, the high frequency wireless signals received from the transmission antenna 11 are received through two antennas 31 and 32 of a reception antenna 30, a socket 33, and the plug 22 of the receiver 20 and are then transmitted to two signal lines. As a user selects a first channel or a second channel, one of the high frequency wireless signals, which has been transmitted to one of the antennas 31, 32, is selected in an antenna switch 24.

The wireless signal selected in the antenna switch 24 serves to lower a noise index of a wireless signal received from a low-noise high-frequency amplifier 26 through a filter 25. The wireless signal from which noise has been eliminated by the low-noise high-frequency amplifier 26 is mixed with an oscillating frequency, which is output from a voltage-controlled oscillator 34c according to a voltage, in a first mixer 27. A microprocessor 28 that receives information about a channel selected by a user through a remote controller 28a controls a channel frequency for selecting the first channel or the second channel to be output while controlling a switch 29 that receives different bands of oscillating frequencies from a first channel oscillator 29a and a second channel oscillator 29b, respectively.

The channel frequency is input to a PLL 34a of a channel stabilization circuit 34 that has received the channel frequency as a reference signal from the switch 29. Accordingly, a stabilized output of a channel frequency that has been divided in the same manner as the frequency of the reference signal by a DC negative feedback circuit can be obtained.

The channel frequency from which noise has been eliminated while moving from the PLL 34a to a filter 34b is compared with an oscillating frequency from the voltage- controlled oscillator 34c that outputs a desired oscillating frequency according to a voltage.

The frequency of the oscillating frequency from the voltage-controlled oscillator 34c, which has been divided in a divider 34d, is phase-locked to a reference frequency in the PLL 34a, thus obtaining a stabilized channel frequency.

The first mixer 27 that has received the oscillating frequency from the voltage-controlled oscillator 34c outputs the wireless signal, which is received through a selected channel, to a second mixer 35 so that the wireless signal is mixed with the frequency divided in the divider 34d.

Received Signal Strength Indication (RSSI) data of the mixed wireless signal output from the second mixer 35, which have been detected through a RSSI detection unit 37 while passing through a 10.7MHz filter 36, are transmitted to the microprocessor 28 in order to determine whether it is an optimal reception state.

The wireless signal that has passed through the 10.7MHz filter 36 is demodulated in a FM demodulator 38 in order to separate a mixed carrier from the wireless signal.

The wireless signal demodulated in the FM demodulator 38 selectively outputs a 1-channel audio signal or a 2- channel audio signal under the control of the microprocessor 28 while passing through an audio frequency (AF) switch 39.

The 1-channel audio signal and the 2-channel audio signal output from the AF switch 37 are transmitted to a 1- channel audio filter 42 and a 2-channel audio filter 43, respectively. The 1-channel audio signal and the 2-channel audio signal that have passed through the 1-channel audio filter 42 and the 2-channel audio filter 43, respectively, are selectively muted in a 1-channel muting unit 44 and a 2- channel muting unit 45 according to a 1-channel muting signal ICH MUTE or a 2-channel muting signal 2CH MUTE received from the microprocessor 28.

The 1-channel audio signal and the 2-channel audio signal that have passed through the 1-channel audio filter 42 and the 2-channel audio filter 43 are mixed in an audio mixer 46 and are then output as an audio signal.

The audio signal output from the audio mixer 46 is amplified as a low signal if the signal is low and is amplified as a high signal if the signal is high through an expander 47, thereby restoring indigenous sound whose tone is not damaged.

The audio signal amplified in the expander 47 is amplified in an audio output amplifier 48, so that the wireless signal is directly transmitted through the plug 21 inserted into a socket of a sound machine (not shown) . An option selected by user as well as a signal depending on the key input from the microphone 1, which is included in the audio mixer 46 and transmitted, is separated from a data separation unit 49 and is then transmitted to the microprocessor 28 as data. A sine wave detector 50 detects a frequency level from the 1-channel audio signal and the 2-channel audio signal received from the audio mixer 46. The detected frequency level is input to the microprocessor 28 as a voltage value corresponding to a frequency while passing through a frequency-voltage (F-V) converter 50a. Accordingly, a better signal can be selected from the audio signals of the two channels .

An operation of the transmitting and receiving apparatus for the wireless microphone constructed above according to the present invention will be described in detail with reference to FIGS. 5 to 8.

A first start signal that has passed through the socket 11 from the microphone 1 is transmitted to a transmitter battery 19 of a switching unit 13. The first start indicates that the microphone 1 is being used.

The wireless signals that have passed through the plug 11 are input to a microphone input compressor 14 in which a low signal is amplified as a high signal and a high signal is amplified as a low signal by two transistors TRl, TR2. The wireless signals amplified in the microphone input compressor 14 are amplified to a proper level in a preamplifier 15 including a diode Dl and a transistor TR3.

The wireless signals amplified in the pre-amplifier 15 are input to a FM modulator 16 having an enable terminal EN to which power is input according to the start signal and an input terminal IN. Therefore, frequency modulation in which the amplitude of a carrier from an oscillator is varied according to the frequency of a signal is performed.

A multi-vibrator oscillation unit lβa includes transistors TR4, TR5 and TR6 and resistors Rl, R2, R3 and R4.

The multi-vibrator oscillation unit 16a is formed between the plug 11 and the FM modulator 16 in order to accurately recognize that the microphone is turned on/off.

To the plug 11 is connected a comparator 16b in order to smoothly recognize variation by a resistance value ranging from 0 to 600 Ω of a general microphone and also variation by a resistance value ranging from 0 to 30 Ω .

A reference frequency generation unit lie includes transistors TR7, TR8, a variable resistor VRl, diodes D2, D3, and an oscillator OSCl. The reference frequency generation unit 17e generates a frequency that becomes a basis for comparison in the next frequency stabilization circuit 17 while modulating the wireless signal based on the wireless signal detected through the comparator 16b. The wireless signals whose frequency has been modulated in the FM modulator 16 are input to the PLL 17a of the frequency stabilization circuit 17. Accordingly, a DC negative feedback circuit can obtain a stabilized oscillation output of a frequency, which has been divided in the same manner as the frequency of the reference signal.

In the PLL 17a, noise of the wireless signals is eliminated while the wireless signals pass through the filter 17b including an inductance Ll and a resistor R5.

The wireless signals from which noise has been eliminated are compared with an oscillating frequency from the voltage-controlled oscillator 17c. The voltage- controlled oscillator 17c includes diodes D4, D5, an inductance L2, and a transistor TR9 and outputs a desired oscillating frequency according to a voltage. The frequency of the oscillating frequency from the voltage-controlled oscillator 17c, which has been divided by the divider 17d, is phased-locked to the reference frequency in the PLL 17a, thus obtaining a stabilized oscillation output. The wireless signals having the frequency stabilized by the frequency stabilization circuit 17 are output as high frequency wireless signals through the transmission antenna 12 via the oscillation and transmission circuit 18 including transistors TRIO, TRIl and inductances L3, L4. Furthermore, the high frequency wireless signals received from the transmission antenna 11 are received through two antennas 31 and 32 of a reception antenna 30, a socket 33, and the plug 22 of the receiver 20 and are then transmitted to two signal lines. As a user selects a first channel or a second channel, one of the high frequency wireless signals, which has been transmitted to one of the antennas 32, 33, is selected in an antenna switch 24.

The wireless signal selected in the antenna switch 24 serves to lower a noise index of a wireless signal received from the low-noise high-frequency amplifier 26 through the filter 25.

The wireless signal from which noise has been eliminated by the low-noise high-frequency amplifier 26 is mixed with an oscillating frequency, which is output from the voltage-controlled oscillator 34c according to a voltage, in the first mixer 27.

The microprocessor 28 that receives information about a channel selected by a user through the remote controller 28a controls a channel frequency for selecting the first channel or the second channel to be output while controlling the switch 29 that receives different bands of oscillating frequencies from the first channel oscillator 29a and the second channel oscillator 29b, respectively.

The channel frequency is input to the PLL 34a of the channel stabilization circuit 34 that has received the channel frequency as a reference signal from the switch 29. Accordingly, a stabilized output of a channel frequency that has been divided in the same manner as the frequency of the reference signal by the DC negative feedback circuit can be obtained.

The channel frequency from which noise has been eliminated while moving from the PLL 34a to the filter 34b is compared with an oscillating frequency from the voltage- controlled oscillator 34c that outputs a desired oscillating frequency according to a voltage.

The frequency of the oscillating frequency from the voltage-controlled oscillator 34c, which has been divided in the divider 34d, is phase-locked to a reference frequency in the PLL 34a, thus obtaining a stabilized channel frequency. The first mixer 27 that has received the oscillating frequency from the voltage-controlled oscillator 34c outputs the wireless signal, which is received through a selected channel, to the second mixer 35 so that the wireless signal is mixed with the frequency divided in the divider 34d. RSSI data of the mixed wireless signal output from the second mixer 35, which have been detected through the RSSI detection unit 37 while passing through the 10.7MHz filter 36, are transmitted to the microprocessor 28 in order to determine whether it is an optimal reception state. The wireless signal that has passed through the 10.7MHz filter 36 is demodulated in the FM demodulator 38 in order to separate a mixed carrier from the wireless signal.

The wireless signal demodulated in the FM demodulator 38 selectively outputs a 1-channel audio signal or the 2- channel audio signal under the control of the microprocessor 28 while passing through the AF switch 39.

The 1-channel audio signal and the 2-channel audio signal output from the AF switch 37 are transmitted to the 1- channel audio filter 42 and the 2-channel audio filter 43, respectively.

The 1-channel audio signal and the 2-channel audio signal that have passed through the 1-channel audio filter 42 and the 2-channel audio filter 43, respectively, are selectively muted in the 1-channel muting unit 44 and the 2- channel muting unit 45.

The 1-channel audio signal and the 2-channel audio signal that have passed through the 1-channel audio filter 42 and the 2-channel audio filter 43 are mixed in the audio mixer 46 and are then output as an audio signal. The audio signal output from the audio mixer 46 is amplified as a low signal if the signal is low and is amplified as a high signal if the signal is high through an expander 47, thereby restoring indigenous sound whose tone is not damaged. The audio signal amplified in the expander 47 is amplified in an audio output amplifier 48, so that the wireless signal is directly transmitted through the plug 21 inserted into a socket of a sound machine (not shown) .

An option selected by user as well as a signal depending on the key input from the microphone 1, which is included in the audio mixer 46 and transmitted, is separated from the data separation unit 49 and is then transmitted to the microprocessor 28 as data.

The sine wave detector 50 detects a frequency level from the 1-channel audio signal and the 2-channel audio signal received from the audio mixer 46. The detected frequency level is input to the microprocessor 28 as a voltage value corresponding to a frequency while passing through the F-V converter 50a. Accordingly, a better signal can be selected from the audio signals of the two channels.

Meanwhile, in the socket 11 at one side of the transmitter 10 coupled to the plug 2 of the microphone 10, resistors R6 to R19 are connected to a variety of keys SWl to SW14 for inputting the options of a user, including 0 to 9 numeral keys, respectively. Therefore, if a user presses one of the keys SWl to SW14, the signals are represented as different current values while passing through the resistors R6 to R19.

Furthermore, the signals depending on the key input, which are represented as different current values, are transferred to the transmission unit 10 as different frequencies while passing through the frequency generation unit 51 connected to the modulation unit 52 by means of diodes Dβ, D7 , an oscillator OSC2 and a transistor TR12. Furthermore, in the case where the transmitter 10 and the receiver 20 are to be charged, the socket 11 of the transmitter 10 is coupled to the plug 22 in a state where the socket 33 of the reception antenna 30, which is coupled to the plug 22 at the other side of the receiver 20, is separated from the plug 22, as shown in FIG. 8.

Furthermore, the plug 41 of the power supply line 40 is coupled to the power socket 23 formed on the side of the receiver 20. The power applied through the power supply line 40 is applied to a power IC 53 through the plug 41, the power socket 23, and a constant voltage diode ZDl. The charged supply power, which has been stabilized while passing through the power IC 53, is charged into the receiver battery 29 via transistors TR17, TR18 and also lights an operational amplifier 0P5 and a light-emitting diode LED2, thus notifying that the battery is being charged.

At the same time, in the power IC 53, the supply power is charged into the transmitter battery 13 via transistors

TR19, TR20, the plug 22 of the receiver 20, and the socket 11 of the transmitter 10, and also lights an operational amplifier 0P6 and a light-emitting diode LED, thus notifying that the battery is being charged.

[industrial Applicability]

As described above, in accordance with the transmitting and receiving apparatus for a wireless microphone according to the present invention, the transmitter coupled to the rear end of the microphone amplifies a signal, stabilizes the frequency of the signal, and outputs the stabilized signal as a predetermined high frequency wireless signal.

A receiver that receives the wireless signal through two antennas amplifies a good wireless signal and transfers the amplified signal to a sound machine directly coupled thereto.

Accordingly, there is an advantage in that batteries built in the transmitter and the receiver, respectively, can be effectively used while being charged by a charging circuit of the receiver, if appropriate.

Although the specific embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

[CLAIMS]

[Claim l]

A transmitting and receiving apparatus for a wireless microphone, the apparatus comprising: a socket 11 formed at one side of a transmitter 10, the socket 11 being inserted into a plug 2 formed at one end of a microphone 1; a transmission antenna 12 formed at the other side of the transmitter 10; a reception antenna 30 disposed at the other side of a receiver 20, for receiving high frequency wireless signals from the transmission antenna 12 of the transmitter 10, the reception antenna 30 being constructed by coupling two antennas 31 and 32 at the same time; a plug 21 formed at one side of the receiver 20; a socket 33 formed at one side of the reception antenna 30 and detachably coupled to a plug 22 formed at the other side of the receiver 20 so that the socket is selectively coupled to the socket 11 of the transmitter 10; and a plug 41 of a power supply line 40, which is coupled to a power socket 23 formed on the side of the receiver 20.

[Claim 2]

The transmitting and receiving apparatus of claim 1, wherein the transmitter 10 is adapted to transmit wireless signals as well as a start signal through the socket 11 of the transmitter 10, which is inserted into the plug 2 at the rear end of the microphone 1, allow a first start signal that has passed through the socket 11 from the microphone 1 to be transmitted to a transmitter battery 19 of a switching unit 13, the first start indicating an On-state where the microphone 1 is being used, allow the wireless signals that have passed through the plug 11 to be input to a microphone input compressor 14, allow the wireless signals amplified in the microphone input compressor 14 to be amplified in a pre-amplifier 15, allow the wireless signals amplified in the preamplifier 15 to be input to a FM modulator 16 to which power is input according to the start signal so that the FM modulator 16 performs frequency modulation on the wireless signals, allow the wireless signals whose frequency has been modulated in the FM modulator 16 to be input to a phase locked loop (PLL) 17a of a frequency stabilization circuit 17, allow the wireless signals that has passed through the PLL 17a and a filter 17b to be phased-locked to a reference frequency in the PLL 17a on the basis of a frequency of an oscillating frequency from a voltage-controlled oscillator (VCO) 17c, which has been divided in a divider 17d, thus obtaining a stabilized oscillation output, and allow the wireless signals output from the frequency stabilization circuit 17 to be output as high frequency wireless signals through the transmission antenna 12 via an oscillation and transmission circuit 18.

[Claim 3]

The transmitting and receiving apparatus of claim 1, wherein the receiver 20 is adapted to allow high frequency wireless signals received from the transmission antenna 11 to be received through two antennas 31 and 32 of a reception antenna 30, a socket 33, and the plug 22 of the receiver 20 and to be then transmitted to two signal lines, wherein as a user selects a first channel or a second channel, one of the high frequency wireless signals, which has been transmitted to one of the antennas 32, 33, is selected in an antenna switch 24, allow the wireless signal selected in the antenna switch 24 to lower a noise index of a wireless signal received from a low-noise high-frequency amplifier 26 through a filter 25, allow the wireless signal from which noise has been eliminated by the low-noise high-frequency amplifier 26 to be mixed with an oscillating frequency, which is output from a voltage-controlled oscillator 34c according to a voltage, in a first mixer 27, allow a microprocessor 28 that receives information about a channel selected by a user through a remote controller 28a to control the output of a channel frequency for selecting the first channel or the second channel to be output while controlling a switch 29 that receives different bands of oscillating frequencies from a first channel oscillator 29 and a second channel oscillator 29b, respectively, allow the channel frequency to be input to a PLL 34a of a channel stabilization circuit 34 that has received the channel frequency as a reference signal from the switch 29, allow the channel frequency from which noise has been eliminated while moving from the PLL 34a to a filter 34b to be phased-locked to a reference frequency in the PLL 34a on the basis of a frequency of an oscillating frequency from a VCO 34c, which has been divided in a divider 34d, thus obtaining a channel frequency, allow the first mixer 27 that has received the oscillating frequency from the voltage-controlled oscillator

34c to output the wireless signal, which is received through a selected channel, to a second mixer 35 so that the wireless signal is mixed with the frequency divided in the divider 34d, allow Received Signal Strength Indication (RSSI) data of the mixed wireless signal output from the second mixer 35, which have been detected through a RSSI detection unit 37 while passing through a 10.7MHz filter 36, to be transmitted to the microprocessor 28, allow the wireless signal that has passed through the 10.7MHz filter 36 to be demodulated in a FM demodulator 38 in order to separate a carrier from the wireless signal, allow the wireless signal demodulated in the FM demodulator 38 to selectively output a 1-channel audio signal or a 2-channel audio signal under the control of the microprocessor 28 while passing through an audio frequency

(AF) switch 39, allow the 1-channel audio signal and the 2-channel audio signal output from the AF switch 37 to be transmitted to a 1-channel audio filter 42 and a 2-channel audio filter 43, respectively, allow the 1-channel audio signal and the 2-channel audio signal that have passed through the 1-channel audio filter 42 and the 2-channel audio filter 43, respectively, to be selectively muted in a 1-channel muting unit 44 and a 2- channel muting unit 45 according to a 1-channel muting signal ICH MUTE or a 2-channel muting signal 2CH MUTE received from the microprocessor 28, allow the 1-channel audio signal and the 2-channel audio signal that have passed through the 1-channel audio filter 42 and the 2-channel audio filter 43 to be mixed in an audio mixer 46 and be then output as an audio signal, allow the audio signal output from the audio mixer 46 to be amplified through an expander 47, allow the audio signal amplified in the expander 46 to be amplified in an audio output amplifier 48, so that the wireless signal is transmitted through the plug 21 inserted into a socket of a sound machine, allow an option selected by user as well as a signal depending on the key input from the microphone 1, which is included in the audio mixer 46 and transmitted, to be separated from a data separation unit 49 and be then transmitted to the microprocessor 28 as data, and allow a sine wave detector 50 to detect a frequency level from the 1-channel audio signal and the 2-channel audio signal received from the audio mixer 46 so that the detected frequency level is input to the microprocessor 28 as a voltage value of a frequency corresponding while passing through a frequency-voltage (F-V) converter 50a.

[Claim 4]

The transmitting and receiving apparatus of claim 1, wherein: a frequency, which has been converted by diodes D6, D7, an oscillator OSC2, and a transistor TR12 while passing through a frequency generation unit 51 connected to a modulation unit 52, is transferred to the socket 11 at one side of the transmitter 10, which is coupled to the plug 2 of the microphone 10, and the modulation unit 52 is adapted to allow resistors Rβ to R19 to be respectively connected to a variety of keys SWl to SW14 for inputting the options of a user, including 0 to 9 numeral keys so that the signals are transferred as different current values.

[Claim 5]

The transmitting and receiving apparatus of claim 1, wherein : power applied through the power supply line 40 is applied to a power IC 53 through the plug 41, the power socket 23, and a constant voltage diode ZDl, charged supply power, which has been stabilized while passing through the power IC 53, is charged into a receiver battery 29 via transistors TR17, TR18 and also lights an operational amplifier OP5 and a light-emitting diode LED2, and the power IC 53 allows the supply power to be charged into the transmitter battery 13 via transistors TR19, TR20, the plug 22 of the receiver 20, and the socket 11 of the transmitter 10, and also lights an operational amplifier OPβ and a light-emitting diode LED3.