KR930002128B1 - Remote control wireless mice system circuit - Google Patents

Abstract

In the remote-controlled wireless microphone system, a receiver and a power amplifier are systematically assembled so that the wireless microphone system can be controlled by the microcomputer built in the receiver without using a special broadcasting facility. The microphone system comprises a transmitter (1) amplifying a voice signal input by a condensor microphone, converting the amplified signal into FM signal, and transmitting RF signal; the receiver (2) amplifying the RF signal, generating a first/second medium frequency, and detecting the voice signal; a microcomputer (3) controlling a battery charging of the transmitter, and AC/DC power system by using a carrier detection signal transmitted from the receiver (2).

Description

Remote control wireless microphone system circuit controlled by the built-in microcomputer

1 is a block diagram of a remote control wireless microphone system circuit of the present invention.

2 is a transmitter circuit diagram of the present invention.

3 is a receiver circuit diagram of the present invention.

4 is a microcomputer circuit diagram of the present invention.

5 is a power amplifier circuit diagram of the present invention.

6 is a flowchart of the CPU control unit of the present invention.

* Explanation of symbols for main parts of the drawings

1: transmitter 2: receiver

3: microcomputer control unit 4: power amplifier

11 low pass filter 12 amplification unit

13: pre-emphasis 14: variable reactance

15: oscillator 16: FM modulator

17: body part 18: aftershock amplifier

19: power amplifier 20, 21: band pass filter

22: RF amplifier 23: first local oscillator

24: first mixer 28: first intermediate frequency section

26: second local oscillation unit 27: the second mixer

28: second intermediate frequency unit 29: limit amplifier unit

30: audio signal demodulation unit 31: deemphasis unit

32: level conversion unit 33: carrier detection unit

41: carrier detection signal input unit

42: Battery charging detection and mode selection unit of the transmitter

43: battery charge switch unit 44: power amplifier input power switching unit

45: display unit 51: power input unit

52: audio signal input unit 53: protection circuit

54: rash prevention part

The present invention relates to a remote control wireless microphone system circuit controlled by a built-in microcomputer.

In a conventional wireless microphone system, only a transmitter and a receiver are configured, and thus, a separate power amplifier and a speaker may be connected to the receiver.

In addition, there was no recharge function by using only one disposable battery in the transmitter or microphone, and the on and off of the transmitter and the whole system had to be operated separately.

Therefore, the present invention organically combines a receiver and a power amplifier to the system main body in view of the above-mentioned conventional drawbacks, and enables the use of the product without a separate broadcasting facility, and controls the entire system by a microcomputer built in the receiving side. For that purpose.

In order to control the microcomputer, the NI-CD battery can be used to charge the transmitter with the built-in standard charging, quick charging switching function, false charging alarm function, and battery remaining capacity to prevent overcharging and warning of excessive consumption. Includes features

In addition, another object of the present invention is to enable a remote control by RF (radio wave) of the transmitter.

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

1 is a block diagram of a remote control wireless microphone system circuit of the present invention, FIG. 2 is a transmitter circuit diagram of FIG. 1, FIG. 3 is a receiver circuit diagram of FIG. 2, and FIG. 4 is a microcomputer of FIG. 5 is a block diagram of the power amplifier circuit of FIG. 1, and FIG. 6 is a flowchart of the operation of the present invention. The remote control wireless microphone system controlled by the built-in microcomputer of the present invention is a condenser as shown in FIG. After amplifying the voice signal received by the microphone and converts the amplified voice signal into an FM signal, the transmitter 1 transmits an RF radio wave through an antenna, and receives and amplifies the signal transmitted from the transmitter 1. Generates one intermediate frequency and a second intermediate frequency, detects the audio signal from the signal, and delivers the detected audio signal to the power amplifier 4 and the external amplifier. The receiver 2 and the carrier detection signal sent from the receiver 2 operate the power amplifier and charge the battery of the transmitter to prevent overcharge, and to perform a false charge alarm function when charging the transmitter in the on state. The microcomputer control unit (3) and the power control system by AC (AC) and DC (DC) control the amount of power check and user's selection for quick charging, and also control the power system by AC (AC) during operation by an external battery. It is composed of a power amplifier (4) which receives AC or DC power by the microcomputer control unit (3), inputs the signal output from the receiver (2), amplifies it, and outputs it to the speaker.

Referring to each part of the present invention configured in this way in more detail, first, the transmitter 1 is made of inductance (L ₁ -L ₂ ), capacitor (C ₁ ) and the like received by the condenser microphone (CM) as shown in FIG. Filling consists of a low-pass filter unit 11 for filtering only audio frequency components (voice) among the received voice signals, resistors (R ₂ -R ₄ ), diodes (D ₁ -D ₂ ), amplifiers (OP ₁ ), and the like. Amplifying unit 12, amplifying the voice signal to the required size, the capacitor (C _3- C ₅ ), the variable resistor (VR ₁ ) and the like to emphasize the high frequency of the voice signal amplified by the amplifier 12 Pre-Emphasis unit 13, variable reactance 14, oscillator 15, capacitor (C ₇ -C ₈ ) crystal oscillator that adjusts the size of the signal appropriately through the variable resistor (VR ₁ ) Variable Reagent which consists of (X ₁ ) etc. and oscillates FM wave (frequency one-third frequency of actual signal frequency to be transmitted) shifted by voice signal It is composed of a tunable FM modulator 16, a combination battery (T ₁ ), a transistor (Q ₁ ), a capacitor (C ₉ -C ₁₁ ), a resistor (R _6- R ₇ ) and the like. 16) a multiplier 17 for multiplying the oscillating FM wave by three, a resistor (R ₈ -R ₉ ), a transistor (Q ₂ ), a capacitor (C ₁₂ -C ₁₃ ), a transformer (T ₃ ), and the like. A signal output from the excitation amplifier 18 consisting of an excitation amplifier 18 to amplify an excitation, a capacitor C ₁₄ -C ₁₅ , a resistor R ₁₀ , an inductance L ₄ , a transistor Q ₉ , and the like. A band pass filter unit which prevents unnecessary propagation by using a power amplifier 19 for amplifying the antenna to a size to drive an antenna, an inductance L ₅ , a capacitor C ₁₆ , a variable capacitor VC _1- VC ₂ , and the like. It consists of 20 and an antenna.

And, the receiver 2 is composed of a Tance (T ₁₁ ), a capacitor (C ₂₁ ), etc. as shown in FIG. 3 to pass only the necessary frequency components through the receiving antenna RF radio waves transmitted from the antenna of the transmitter (1) The bandpass filter unit 21 is composed of a capacitor (C ₂₂ -C ₂₃ ), a resistor (R ₂₁ ), a transformer (T ₂₂ ), a transistor (Q ₂₁ ) of the IC ₂ , etc. to filter in the bandpass filter unit 21. The frequency is determined by a crystal oscillator (X ₂₁ ), inductance (L ₂₁ ) consisting of an RF amplifier 22 for amplifying the signal, a crystal oscillator (X ₂₁ ), an inductance (L ₂₁ ), a resistor (R ₂₂ ), and the like. The first mixer 24 and the ceramic filter CF mixing the amplified signal of the first local oscillator 23 and the RF amplifier 22 and the signal oscillated by the first local oscillator 23 to oscillate the signal. ₁ ) and the first intermediate frequency unit 25 to make an intermediate frequency of 10.7MHz, which is a component corresponding to the difference between the two frequencies mixed in the first mixer 24, The output signal and the second local oscillation part of the second local oscillation part 26, the first intermediate frequency part 25, and the second local oscillation part 26, which are composed of a capacitor C ₂₇ -C ₂₈ , a crystal oscillator X ₂₂ , etc. A second intermediate frequency unit ( ₂ ) for mixing the output signal of (26), a ceramic filter (CF ₂ ), and the like, and outputting the output signal of the second mixer 27 by generating an intermediate frequency of 455 KHz ( 28, a parallel amplifier and a limit amplifier 29 for amplifying the amplitude limited signal of the output signal of the second intermediate frequency unit 28 by a capacitor C ₂₉ -C ₃₀ , an amplifier OP ₂₁ , and the like. (T ₂₁ ), a quadrature detector (Qu ₂₁ ), etc., which consists of a voice signal demodulator 30 for demodulating a voice signal, a capacitor (C ₃₂ ), a resistor (R ₂₄ ), etc. It made up with de-tempering system unit 31 for suppressing the high frequency, a resistance (R ₂₅ -R _26), a capacitor (C ₃₄ -C ₃₆₎ such as to match the output level of the external amplifier And a conversion level converting section 32, which, resistors (R ₂₇ -R _29), a capacitor (C ₃₁ -C _37), variable resistor (VR _22), an operational amplifier (OP _22), muting the amplifier (OP _23), etc. When the radio wave from the transmitter 1 is received by the receiver, the carrier detection signal is obtained, and the carrier detection unit 33 prevents the output of the detector from being transmitted to the power amplifier when the received signal is weak.

On the other hand, the CPU control unit 3 is composed of a photo coupler (PC) or the like as shown in FIG. 4, the transmitter 1 is large, and the receiver carrier detection signal input unit 41 for inputting the receiver 2 carrier detection signal to the microcomputer IC ₄ . ), Resistors (R _41- R ₄₄ ), transistors (Q _41- Q ₄₂ ), zener diodes (ZD ₄₁ ), buzzers (BZ), variable resistors (VR ₄₁ ), comparators (C ₄₁ ), switches (SW ₄₁₎ When the transmitter 1 is inserted into the charger, it detects whether it is charged, prevents mischarge when the power of the transmitter 1 is on, sounds a buzzer for the user to know, and selects a charging mode. Battery charge sensing and induction selector 42, resistor (R ₄₅ ), transistor (Q ₄₃ ), relay (RY ₄₁ ), etc.Battery charge to switch the fast charge and standard charge of the battery according to the user's selection mode made by the switch unit 43, a resistance (R _46), transistor (Q _44), a relay (RY ₄₂₎ etc. And it becomes the power amplifier input power supply switching portion 44 to switch the input power to the power amplifier, a light emitting diode (LED ₄₁ -LED _42), resistors (R ₄₈ -R ₄₉₎ consists of such a display unit for displaying a quick charging and charging standard consists of 45, a microcomputer (IC ₄₎ for controlling the parts.

On the other hand, the configuration of the power amplifier is composed of a bridge diode (BD ₅₁ ), a capacitor (C ₅₁ ), as shown in FIG. 5, the power input unit 51 to receive the input power by the control of the CPU control unit 3, the variable resistor (VR ₅₁ ), a capacitor (C ₅₅ ), etc. consisting of a voice signal input unit 52 for adjusting the volume of the voice signal sent from the receiver (2), and inputs a resistor (R _53- R ₄₇ ), an amplifier (OP _51- ) OP ₅₂ ), protection circuit 53, etc., which adopts BTL (Balance Transformer Less) connection to amplify the audio signal, and amplifies circuit part IC (IC ₅ ), capacitor (C ₅₂ -C ₅₄ ), resistor (R _51- R ₅₂ , R ₅₈ ) and the like are constituted by a power generation prevention unit 54 for preventing oscillation when the amplified voice signal is transmitted to the speaker.

According to the present invention configured as described above, the operation state of the transmitter 1 will be described with reference to FIG. 2, and only the audio signal received by the condenser microphone C ₁₁ is audible frequency component by the low pass filter unit 11. After passing through and amplified by the amplifier 12 to the required size, the pre-emphasis unit 13 emphasizes the high range and the signal size is appropriately adjusted by the variable resistor VR ₁ , and then the variable inside the IC IC ₁ is changed. It is applied to the reactance modulator 16 to oscillate an FM wave whose frequency is shifted by the voice signal.

At this time, the voltage change of the voice signal is changed to the change of reactance, and the oscillation frequency is changed by the natural vibration frequency of the crystal oscillator (X ₁ ), the inductance (L ₃ ) and the variable reactance 14 which is varied by the voice signal. It becomes FM signal which is shifted by.

Therefore, the oscillated FM signal is actually 1/3 of the frequency of the signal to be transmitted, so it passes through the multiplication unit 17 to multiply. In the multiplication unit 17, the FM signal output of the variable reactance FM modulator 16 is C. is applied to the base of the class amplifier transistor (Q ₁₎ which this time is output to the transistor (Q ₁₎ to the C-class amplifier includes a high frequency, there are many.

Among them, only the signal frequency component is selected by a trend (T ₁ ) which is resonant with the signal frequency. The signal frequency (RF propagation) is composed of a transistor (Q ₃ ) inside the IC and a transformer (T ₃ ) outside the IC. Power is amplified to the size that the power amplifier 19 can drive the antenna through the excitation amplifier 18, and then through the band pass filter 20 to prevent reflection of radio waves from the bar antenna to the space Unlike conventional remote control, it is transmitted, and it is possible to control the omnidirectional control.

In addition, the operating state of the receiver 2 will be described with reference to FIG.

That is, as described above, the RF radio wave transmitted from the transmitter 1 passes only the necessary frequency component through the band pass filter unit 21 through the reception antenna, and the RF amplifier 22 inside the dual conversion FM receiver IC (IC ₂ ). A signal oscillated by the first local oscillator 23 whose amplitude is amplified by the crystal oscillator (X ₂ ) and the reactance (L ₃ ) is mixed in the first mixer 24.

The mixed signal becomes the first intermediate frequency of 10.7 MHz through the second intermediate frequency unit 25 and this signal is mixed in the second mixer 27 with the output signal of the second local oscillator 26 of 10.245 MHz.

The signal mixed in the second mixer 27 becomes a second intermediate frequency of 455 MHz in the second intermediate frequency unit 28.

In addition, the output signal of the second intermediate frequency unit 28 is amplified by the limit amplifying unit 29 as an amplitude limited signal, which is transmitted to a quadrature detector Qu ₂₁ combined with a parallel resonator T ₂₁ . The audio signal is detected and demodulated by this.

Therefore, the detected voice signal is suppressed by high heat as emphasized when transmitted from the de-emphasis unit 31, is output to the external amplifier via the level converter 32, and the volume is adjusted by the variable resistor VR ₂₁ . Output to the power amplifier.

When the radio wave from the transmitter 1 is received by the receiver 2, the carrier detection signal is obtained from the variable resistor VR ₂₂ and the operational amplifier OP _{22 of} the carrier detector 33, and the double signal is a resistor R ₃₀ . It is applied to the muting amplifier (OP ₂₃ ) through.

The muting amplifier OP ₂₃ is a squelch circuit that prevents the detection output of IC (IC ₂ ) from being transmitted to the power amplifier by making the middle terminal of the variable resistor VR ₂₁ to ground level when the received signal is weak. It works.

In addition, the carrier detection signal operates the port coupler input side of the microcomputer control unit 3 via the operational amplifier OP ₂₂ .

Hereinafter, the operation state of the CPU control unit 3 will be described with reference to FIG. 4 and FIG. 6 which is a flowchart thereof.

)로 신호를 입력시켜 주면 마이크로 컴퓨터(IC₄)는 다시 확실하게 송신기(1)가 커져서 캐리어 검출신호가 생길 것인지 판정한 후 제1도에서의 파워 앰프(4)에 전원을 공급하여 파워 앰프(4)를 동작시키게된다.That is, when the carrier detection signal generated when the transmitter 1 is turned on operates the port diode which is the input side of the photocoupler PC of the receiver carrier detection signal input unit 41, the photocoupler operates to operate the microcomputer IC ₄ . Input terminal of (PA

When the signal is input to the microcomputer IC ₄ , the microcomputer IC ₄ reliably determines whether the transmitter 1 is large and the carrier detection signal is generated. Then, the microcomputer IC ₄ supplies power to the power amplifier 4 in FIG. 4) to operate.

In addition, when the transmitter 1 is inserted into the charger, the input terminal PA ₁ of the microcomputer IC _{4 is} formed by the Zener diode ZD ₄₁ and the transistor Q _{41 of} the transmitter battery charge sensing and mode selector 42. The charging terminal voltage is sensed through the comparator OP _{41 and the} comparator OP ₄₁ detects the charging voltage through the input terminal PA ₆ of the microcomputer IC ₄ .

At this time, since the charging is not possible when the power of the transmitter 1 is in the on state, the microcomputer IC ₄ detects the power supply of the transmitter 1 in the high state through the output terminal PB _{3 in} order to prevent such a mischarge. Since the output of the level (5V) transistor Q ₄₂ is turned on and the buzzer BZ rings to generate a warning sound.

)로부터 하이레벨(5V)이 출력되어 밧데리 충전스위칭부(43)의 트랜지스터(Q₄₃)를 온시킴과 동시에 릴레이(RY₄₁)가 작동하여 이 릴레이(RY₄₁)와 연동하는 스위치(SW₄₂)가 이동하므로 대전류의 신속충전 모드가 되어 신속충전 되다가 밧데리 상태에 따라 30-60분사이에 정해진 단자 전압을 초과할 경우 완전충전된 것으로 간주하여 마이크로 컴퓨터(IC₄)에서 릴레이(RY₄₁)를 다시 역으로 동작시켜 스위치(SW₄₂)를 원위치시키므로 소전류의 표준추전으로 모드가 전환된다.At this time, the charging operation is initially operated in the small current table charging mode. When the user presses the switch SW ₄₁ once, the output terminal PB of the microcomputer IC ₄ is selected.

) High level (5V), the switch and is output and simultaneously turns on the transistor (Q ₄₃₎ of the battery charge switching unit 43, a relay (RY ₄₁₎ working in conjunction with the relay (RY ₄₁₎ (SW ₄₂₎ from Is moved to the fast charging mode of the large current, and then it is charged quickly. If the terminal voltage is exceeded between 30-60 minutes depending on the battery condition, the relay is considered to be fully charged and the relay (RY ₄₁ ) is reset from the microcomputer (IC ₄ ). In reverse operation, the switch (SW ₄₂ ) is returned to the original mode.

Here, the red LED (LED ₁ ) of the display unit 45 at the time of fast charging, the blue LED (LED ₂ ) is turned on at the standard charging, respectively, to indicate the state of charge.

On the other hand, the operation of the power amplifier 4 as shown in FIG. 5 is processed by a switch in order to avoid unstable operation of the power amplifier by the carrier detection signal sent from the receiver 2.

The basic operation of the power amplifier 4 employs a BTL, and this circuit scheme is advantageous in the case of low-voltage high output, in which two amplifiers (OP ₅₁ -OP ₅₂ ) amplify the same signal by 180 degrees out of phase with each other.

The power amplifier 4 controls the volume of the detected voice signal sent from the receiver 2 with the variable resistor VR ₅₁ of the voice signal input unit 52 and applies it to the BTL and the power amplifier circuit IC ₅ . The audio signal is transmitted to the speaker via the oscillation prevention circuit unit 54.

The present invention as described above can be used to recharge the battery of the transmitter (1) compared to the conventional wireless microphone system, and the battery consumption check function and rapid charging of the transmitter 1 by the microcomputer (IC ₄ ) of the system main body There is an error charge warning function, and the power consumption is reduced by switching the power amplifier which takes up the most of the power consumption by turning the transmitter on and off, and all these operations are controlled by the built-in microcomputer's software to prevent malfunction. In addition to the built-in audio power amplifier, there is an advantage that does not require a separate mixer, power amplifier, etc. broadcasting equipment.

Claims (5)

Built-in rechargeable battery and condenser microphone, the voice signal input by the condenser microphone is amplified and converted into an FM signal, and then a transmitter (1) for transmitting RF radio waves and a first intermediate frequency after receiving and amplifying the signal from the transmitter The receiver 2 generates a second intermediate frequency, detects a voice signal, and transmits it to a power amplifier and an external amplifier, and operates the power amplifier by a carrier detection signal sent from the receiver 2. The output of the microcomputer control unit 3 and the receiver 2, which controls overcharge prevention, false charge warning, and rapid charging, and controls the power supply system by AC and the power supply system by DC during operation by an external battery. And a power amplifier 4 configured to receive an AC or DC power supply by the microcomputer control unit 3 and amplify the same signal by using two amplifiers having a phase difference of 180 degrees. W remote control wire is controlled by a built-in microcomputer, it characterized the response is composed microphone system circuit. 2. The transmitter (1) according to claim 1, wherein the transmitter (1) includes a low pass filter (11) for passing only a voice signal among signals received by the condenser microphone (CM), and an amplifier (12) for amplifying the passed voice signal by a required size. And an FM modulator 16 for oscillating an FM wave whose frequency is shifted by the voice signal output from the pre-emphasis unit 13 for emphasizing the high range of the amplified voice signal and adjusting the voice signal size. A multiplier 17 for multiplying the oscillated FM wave to a frequency to be actually transmitted, an excitation amplifier 18 for exciting and amplifying the multiplied frequency, and an power amplification signal for amplifying the excited signal to drive the antenna. A wireless microphone system circuit controlled by a built-in microcomputer, characterized by comprising an antenna (19), a bandpass filter (20) to prevent unnecessary radio waves, and an antenna. The RF receiver of claim 1, wherein the receiver 1 receives the RF radio wave transmitted from the receiver 1 and passes a band pass filter 21 for passing only a required frequency component, and an RF amplifying unit for amplifying the RF signal. 22), a first local oscillator 23 for oscillating an arbitrary frequency signal, a first mixer 24 for mixing the outputs of the RF amplifier 22 and the first local oscillator 23, and A first intermediate frequency 25 for outputting an intermediate frequency corresponding to two frequency differences (10.7 MHz), a second local oscillator 26 for oscillating a frequency signal (10.245 MHz), and the first intermediate frequency unit; A second mixer 27 for mixing the output signals of the second and second local oscillators 26 and the second intermediate frequency unit for outputting the output signal of the second mixer 27 into an intermediate frequency signal (455 MHz); (28), a limit midwidth section (29) for amplifying the output of the second intermediate frequency section (28) to an amplitude limited signal, and a voice for demodulating the audio signal to an amplitude limited amplification signal. The signal demodulation section 30, the de-emphasis section 31 which suppresses the high range as emphasized by the pre-emphasis section 13 of the transmitter 1, and the level conversion for converting the audio signal to a level suitable for an external amplifier. And a carrier detector 33 for receiving a carrier detection signal when the RF signal is received by the receiver 2 and preventing the carrier detection signal from being transmitted to the power amplifier when the signal is weak. Remote control wireless microphone system circuit controlled by a built-in microcomputer. 2. The microcomputer control section (3) according to claim 1, characterized in that the microcomputer control section (3) is provided with a receiver carrier detection signal input section (41) for inputting a receiver detection signal of the receiver (2) generated by the transmitter (1) turned on, and when inserted into the transmitter (1) during charging. Battery charge detection and mode selector 42 for detecting charging and charging voltages, preventing and informing false charges, and selecting a charging mode, and battery charge switching for switching between fast charging and standard charging of batteries by mode selection. The unit 43, a power amplifier input power switching unit 44 for switching the input power of the power amplifier, a display unit 45 for displaying the fast charging and standard charging of the battery, and each of the parts to control the presence or absence of a carrier detection signal in accordance with a remote controlled pressure supply and controlled by a built-in microcomputer, characterized by configured to include a microcomputer (IC ₄₎ for a battery charging control and display Troll Wireless microphone system circuit. The power amplifier (4) according to claim 1, wherein the power amplifier (4) includes a power input unit (51) supplied with input power by the CPU controller (3), and a voice signal input unit for adjusting the volume of the voice signal sent from the receiver (2). 52), an amplifying circuit IC ₅ for amplifying a voice signal, and an oscillation preventing unit 54 for preventing oscillation when the amplified voice signal is transmitted to the speaker. Remote control wireless microphone system circuit controlled.

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