KR100968816B1 - The monitor and broadcast device choosing the least noises - Google Patents

Abstract

PURPOSE: A surveillance camera selecting the least noises and a broadcasting device are provided to select and output a frequency band having the least noises. CONSTITUTION: A hand wireless receiver includes a microphone, a transmission antenna, an amplifier and a modulator. The amplifier amplifies a voice signal, and the modulator modulates a 200MHZ band, 700MHZ band and 900MHA band. A wireless receiver includes a reception antenna, an amplifier, a decoder, a phase shifter and a level meter. The amplifier amplifies the modulated signal voice signal to 200MHZ band, 700MHZ band and 900MHA band. The decoder decodes the amplified voice signal.

Description

Surveillance cameras and broadcasters selecting the least noise channel {The monitor and broadcast device choosing the least noises}

The present invention relates to a broadcast apparatus, wherein a sound source signal generated through a sound source generator (microphone, microphone) or a sound player (CD player, cassette deck, digital tuner, etc.) is amplified through a process of tuning, modulation, and amplification. The speaker converts an electric signal into an acoustic signal so that sound can be heard by the listener.

The structure of the premises broadcasting device is generally a rack type rather than an integrated type, and a unitary rack type by combining (assembling) a panel (called a panel or a module) each having unique functions at the user's convenience. Consists of.

In general, in the case of the premises broadcasting system, the basic configuration is as follows.

AUTO BLOWER: When the temperature inside the rack rises, the entire system is operated stably by operating the fan manually or automatically.

MONITOR PANEL: This monitor has a selector switch function for monitoring each speaker of the power amplifier. Usually, the monitor speaker output is integrated with the monitor speaker type with the magnification selector switch (0dB, -6dB, -12dB, -18dB, -24dB). Can be controlled.

Sound source playback apparatus: digital radio (DIGITAL TUNER), cassette player (CASSETTE DECK), compact disc player (CD PLAYER) and the like.

Emergency panel (EMERGENCY PANEL): Connected with the automatic fire detector, the emergency alarm sound is transmitted first when a fire occurs.

CHIME & SIREN: A chime signals the beginning and the end, and generates siren tones of wave and flat plates for emergency or alarm broadcasts.

PROGRAM EXCHANGER: This unit automatically switches the signal when a remote, timer, etc. is input, and operates the speaker with individual switches, all switches, and group switches for the power amplifier output signal. Let's do it.

In addition, by setting the priority of the input signal, it blocks the signal with the lower priority and outputs only the signal with the highest priority, and controls the signal with the input control function of general broadcasting, remote control and timer, and one group switch. Can operate multiple speaker lines.

POWER DISTRIBUTOR: Controls the power of all the equipment installed in the rack system.

BATTERY CHARGER MODULE: This device has an overcharge protection function that automatically starts charging when the battery voltage stored in the emergency power supply is below a certain voltage and automatically stops charging when the battery voltage is below a certain voltage. It is possible.

BLANK PANEL: This panel is mounted on international standard rack cabinet. It also installs various equipment in standard rack cabinet and fills the remaining space and naturally generates heat. It has the function to reduce the heat conduction between devices by installing it in the middle of various devices. All sizes are manufactured according to the international standard.

RACK CABINET: This equipment is rack cabinet for mounting sound equipment of EIA standard. The size of top, bottom and left and right are manufactured according to the standard.

Emergency battery (EM. BATTERY): Battery for emergency power

MICROPHONE: Sound source generator that converts voice into electric signal

PRE AMP: 4-band equalizer (EQ) at the main volume for better sound quality, power supply for condenser microphones, and DC + 24V even in the event of a power outage It can be used by the battery, and the built-in broadcasting function to operate preferentially with respect to other external inputs.

In an audio configuration, an audio device in charge of amplification is called an amplifier or amplifier, and serves to amplify a small electrical signal into a large electrical signal. Therefore, the amplifier is the basis of all electronic circuits, and electronics also assigns an important weight to the analysis and design of the amplifier.

In audio equipment, amplifiers are divided into preamplifiers (pre amplifiers) and power amplifiers (power amplifiers). When these two amplifiers are in a single device, they are called integrated amplifiers.

The output of the audio device is once amplified in the preamplifier and added to other controls and sent to the power amplifier. The power amplifier sends a large amount of power to the speaker to amplify the voltage and current of the electrical signal simultaneously. Audio quality depends a lot on the circuitry used in the amplifier, the quality of the material, and the type of amplifier.

Other devices may intervene between the two types of amplifiers described above, such as equalizers, dynamic expanders, and surround processors.

Equalizers have been around for a long time since they emerged as the new leaders in audio systems. In recent years, its use is more and more dozens of types, boasting excellent in terms of performance and design. These products were a kind of accessory in acoustics only a few years ago, but they are now a firm part of the audio system.

In general, in an audio device, an equalizer amplifier is a device that has a function of increasing or decreasing the amplification of 5 to 32 frequencies between 16 Hz and 32 kHz in the low range. In other words, the equalizer is capable of making sounds according to the tastes of the listeners.

The A / V facility is designed to achieve the effect by configuring the audio / video equipment to an optimal level to effectively support various events. The audio part includes the wired / wireless microphone, the speaker, the speaker, Audio mixers, audio tuners, digital decks, CD players, etc. are combined in a rack type, and video parts include video support equipment (VTR & DVD), projectors, etc. (PROJECTOR), SCREEN, etc. are added.

In addition, wireless microphones are used for conference rooms, seminars, lectures, plays, and event events, and wireless receivers are used for wireless communication between wireless microphones and broadcasting equipment.

Among the wireless receivers, a small condenser microphone and a small hand-held wireless receiver (BELT PACK TYPE TRANSMITTER) are used as transmitters for easy use in lectures, theater performances, etc., and they are received through a wireless receiver (WIRELESS RECEIVER), which is a preamplifier input terminal. Amplify it with a power amplifier and transmit it to the speaker.

For remote control of broadcasting equipment, speaker group selection, volume control, preliminary chime, and microphone selection broadcasting can be performed by using MIC STATION KEYPAD or MIC STATION MIC using RS-422 communication method or UTP cable. There is a remote controller available, and there is a remote controller using near-infrared remote control, and it is possible to control the sound source playback device (CD player, cassette deck, digital tuner, etc.) and playback, recording, volume control in short distance. .

The broadcasting device uses an integrated type according to the specificity and the conditions of the site where the broadcasting device is provided, or the modules (panels) are assembled in accordance with the conditions by inserting the above modules (panels) into a rack.

The above example shows an example of a general configuration, and various equipments are called various names.

In addition, there is a wireless surveillance camera that does not require wiring, and there is a wireless surveillance camera that displays the captured image by transmitting the image captured by the surveillance camera to a remote site through the wireless antenna.

A microprocessor is a TTL or CMOS IC that only moves according to certain characteristics, whereas a microprocessor allows an administrator to inject a program into a processor to implement a desired operating characteristic. The microprocessor may execute instructions and execute specific instructions like a computer CPU. It is possible to receive a control command of the main control unit for the control of the present invention is a main configuration for controlling according to the input control command (program).

Conventional method of collecting a voice signal converted to an electric signal after collecting through a microphone and transmitting the signal through a wireless receiver (BELT PACK TYPE TRANSMITTER), and then receiving the signal through a wireless receiver (WIRELESS RECEIVER), which is transmitted to the input terminal of the preamplifier. In the wireless microphone system, the present invention is a hand wireless receiver, which is multiplexed into three bands of 200MHZ band (217.250MHZ ~ 220.110MHZ, 223.000MHZ ~ 225.000MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ), and 900MHZ (928.000MHZ ~ 930.000MHZ). It transmits wirelessly and receives it through a wireless receiver which is a receiver and selects a noise frequency band through a phase inverter and a mixer, and selects a frequency band having the least noise among the frequencies received in three frequency bands and transmits it to a preamplifier.

In addition, the basic system can be applied to a wireless surveillance camera.

The electrical signals transmitted in the three frequency bands are called A, B, and C. If the phase inverted electrical signals are -A, -B, -C, the mixer (A, -B) (A, -C) ( Input signals to the limiter by mixing them in pairs such as B, -C) and list them in the order of the lowest output level. And automatic switching.

Select and output the frequency band with the least noise.

Handheld receiver consists of microphone, transmission antenna, amplifier and modulator. After amplifying voice signal converted into sound and electric signal through microphone, the amplifier 200MHZ band (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ) ), 900MHZ bands (928.000MHZ ~ 930.000MHZ) are modulated by three modulators for each of three bands and transmitted to a wireless receiver through a transmission antenna.

The wireless receiver consists of a receiving antenna, an amplifier, a demodulator, a phase inverter, and a level meter, and consists of 200MHZ band (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ) and 900MHZ band (928.000MHZ ~ 930.000MHZ). A voice signal transmitted at a frequency is received at a receiving antenna, amplified by an amplifier, and demodulated through a demodulator.

After demodulating the 200MHZ band (217.250MHZ ~ 220.110MHZ) through the phase inverter, the first signal is made by passing the demodulated voice signal and the frequency mixer in the 700MHZ band (740.000MHZ ~ 752.000MHZ).

After the demodulated voice signal of 200MHZ band (217.250MHZ ~ 220.110MHZ) passes through the phase inverter, the second signal is made through the demodulated voice signal and frequency mixer in 900MH band (928.000MHZ ~ 930.000MHZ).

The demodulated voice signal of 700MHZ band (740.000MHZ ~ 752.000MHZ) passes through the phase inverter, and then the third signal is made through the demodulated voice signal and frequency mixer in 900MH band (928.000MHZ ~ 930.000MHZ).

As shown in FIG. 2, an output signal equal to or higher than the manager input level is extracted by passing the first signal, the second signal, and the third signal through the level meter.
In FIG. 2, (A) the first signal passing through the level meter is an example in which five output signals greater than or equal to the manager level meter are extracted, and (B) the second signal passing through the level meter is greater than or equal to the output signal of the manager level meter. This is an example of two extractions. (C) In the case of the third signal passing through the level meter, three output signals of the manager level meter or more are extracted.
The output signal (noise) extracted as above is input to the main control part composed of microprocessors, and the signal having the least output signal above the manager input level (the second signal (two) in FIG. 2 is 200 MHz and 900 MHz frequencies) and then Select a duplicated frequency band (900MHz) of the small signal (700MHz and 900MHz frequency with the third signal (three) in Figure 2).
The selected overlapped frequency is a frequency band with the least noise, which is 900 MHz in FIG. 2.
In the 200MHZ, 700MHZ, and 900MHZ bands of the hand radio receiver, the modulators are modulated by three modulators for each of the three bands, respectively. Only one voice signal is amplified by the amplifier through a demodulator demodulated and outputs the input signal to the preamplifier is a surveillance camera and broadcasting device for selecting a minimum noise channel.

As shown in FIG. 1, when the 700MHZ band voice signal (a) and the phase inverted 200MHZ band voice signal (b) pass through the frequency mixer, the noise portions generated in the two frequency bands as shown in FIG. The offsets are output.

That is, if no noise occurs when modulating and transmitting / receiving the 700MHZ and 200MHZ bands to transmit the voice signal wirelessly, if the noise is not generated at all, the 700MHZ and 200MHZ demodulate the same voice signal and demodulate one. Passing the frequency mixer results in no output other than the output shown in (c).

However, when noise (noise) is generated, an output as shown in FIG. Get the output signal above and input the signal output above the manager input level into the main controller part composed of microprocessor.

The microprocessor is composed of the microcontroller and compares the signal output above the manager's input level with the comparator for the unit time input by the administrator (for example, the administrator inputs the program input value for 10 minutes for 10 minutes and 10 seconds for 10 seconds). (Tip-flop or multi-vibrator can be used as an example of counting by a counter circuit.) The signal having the least output signal above the manager input level and the next least signal, that is, the first signal, the second signal, and the third signal Surveillance cameras and broadcasting apparatuses for selecting a minimum noise channel characterized by a main control section for selecting and outputting overlapping frequency bands from two selected signals.
When the frequency selection portion is described in detail, the first signal, the second signal, and the third signal are passed through the level meter to extract the output signal above the manager input level and input the input signal to the main control part composed of the microprocessor.
The main control part selects an overlapping frequency band among two corresponding frequency bands of the signal with the least input signal of the manager input level and two corresponding frequency bands of the next lowest signal, and receives the voice signal transmitted at the selected frequency. It is a surveillance camera and a broadcasting device that selects the minimum noise channel, characterized in that the audio signal received by the amplifier, amplified by the demodulator and output through the demodulator is input to the preamplifier, and the remaining two frequency bands are not used.

For example, the second signal (200MHZ band, 900MHZ band frequency mixer output) with the least output above the manager input level, the second signal is the third signal (700MHZ band, 900MHZ band frequency mixer output) with the least output above the manager input level In this case, the voice signal transmitted at 900MHZ band (928.000MHZ ~ 930.000MHZ) by selecting the overlapping frequency band 900MHZ band is received at the receiving antenna of the radio receiver, amplified by the amplifier and demodulated and output through the demodulator. Is input to the preamplifier to transmit the received voice signal at the optimum frequency with less noise to the preamplifier, the surveillance camera and broadcast apparatus for selecting a minimum noise channel.

Conventionally, there is a radiotelephone which automatically selects and selects a frequency band with low noise, but its effect is similar, but its technical implementation is completely different from the present invention.

In one embodiment, the 200MHZ band is replaced by 223.000MHZ ~ 225.000MHZ, the hand-wired receiver is replaced by a wireless microphone, and the display signal consisting of LEDs are further configured to pass the level meter to compare the output signal of the manager input level or more and output signal Surveillance cameras and broadcasting apparatuses for selecting a minimum noise channel characterized by a main control section that lights up and displays LEDs of overlapping frequency bands of two corresponding frequency bands of the least signal and two corresponding frequency bands of the next lowest signal. .

In one embodiment, the hand radio receiver is replaced by a wireless surveillance camera, the wireless surveillance camera is composed of a camera, a transmission antenna, an amplifier, a modulator, converts the image taken by the camera into a video signal, and then amplifies the video signal in the amplifier 200MHZ band (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ), 900MHZ band (928.000MHZ ~ 930.000MHZ) for each of the three modulators, each of which is modulated by three modulators and transmitted to the wireless receiver through the transmit antenna. The radio receiver consists of a receiving antenna, an amplifier, a demodulator, a phase inverter, and a level meter.The 200MHZ band (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ), 900MHZ band (928.000MHZ ~ 930.000MHZ) The video signal transmitted at the frequency of is received at the receiving antenna, amplified by the amplifier and demodulated through the demodulator. The demodulated video signal in the 200MHZ band (217.250MHZ ~ 220.110MHZ) passes through the phase inverter and 700MHZ. Inverse first signal which has passed through the (740.000MHZ ~ 752.000MHZ) and the frequency mixer,

After demodulating the 200MHZ band (217.250MHZ ~ 220.110MHZ) through the phase inverter, and then the 900MH band (928.000MHZ ~ 930.000MHZ) and the second signal passing through the frequency mixer, the 700MHZ band (740.000MHZ ~ 752.000MHZ) A third signal passing through the demodulated image signal through a phase inverter and passing through a 900 MH band (928.000 MHZ to 930.000 MHZ) and a frequency mixer;
A first signal, a second signal, and a third signal are passed through the level meter to extract an output signal of a manager input level or higher and input the input signal to a main control unit composed of a microprocessor;
The main control part selects an overlapping frequency band among two corresponding frequency bands of the signal with the least input signal of the manager input level and two corresponding frequency bands of the next lowest signal, and receives the video signal transmitted at the selected frequency. It is a surveillance camera and a broadcasting device for selecting the minimum noise channel, characterized in that the video signal received from the amplifier, amplified through the demodulator and outputted to the digital recording storage device, and the remaining two frequency bands are not used.

1 is an exemplary diagram for understanding a voice signal and a frequency mixer
2 is a simplified diagram of an output signal passing through a level meter

Claims (3)

Handheld receiver consists of microphone, transmission antenna, amplifier and modulator, and converts sound signal and voice signal through microphone, and then amplifies voice signal from amplifier, 200MHZ band (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ) ), And modulate in each of the three modulators for each of the three 900 bands (928.000MHZ ~ 930.000MHZ) to transmit to the radio receiver through the transmission antenna; The wireless receiver consists of a receiving antenna, an amplifier, a demodulator, a phase inverter, and a level meter, and consists of 200MHZ band (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ) and 900MHZ band (928.000MHZ ~ 930.000MHZ). Receiving a voice signal modulated by a frequency at a receiving antenna, amplifying the amplifier, and demodulating the demodulator through a demodulator; A first signal passing through the demodulated voice signal of 200MHZ band (217.250MHZ ~ 220.110MHZ) through a phase inverter and then passing the demodulated voice signal and a frequency mixer in 700MHZ band (740.000MHZ ~ 752.000MHZ); A second signal passing through the demodulated voice signal in the 200MHZ band (217.250MHZ ~ 220.110MHZ) through the phase inverter and then passing through the demodulated voice signal and the frequency mixer in the 900MH band (928.000MHZ ~ 930.000MHZ); A third signal having passed the demodulated voice signal of the 700MHZ band (740.000MHZ ~ 752.000MHZ) through the phase inverter and then passing the demodulated voice signal and the frequency mixer in the 900MH band (928.000MHZ ~ 930.000MHZ); A first signal, a second signal, and a third signal are passed through the level meter to extract an output signal of a manager input level or higher and input the input signal to a main control unit composed of a microprocessor; The main control part selects an overlapping frequency band among two corresponding frequency bands of the signal with the least input signal of the manager input level and two corresponding frequency bands of the next lowest signal, and receives the voice signal transmitted at the selected frequency. And a voice signal, which is amplified by an amplifier and demodulated through a demodulator, is input to a preamplifier, and the remaining two frequency bands are not used. The method of claim 1, wherein the 200MHZ band is replaced with 223.000MHZ ~ 225.000MHZ; Hand-wired receivers are replaced by wireless microphones; The display unit consisting of LEDs is additionally configured to pass through the level meter to compare output signals above the manager input level, and the overlapping frequency of two corresponding frequency bands of the signal with the lowest output signal and two corresponding frequency bands of the next lowest signal. Surveillance cameras and broadcasting apparatus for selecting a minimum noise channel characterized in that the main control unit to turn on and display the LED of the band. The method of claim 1, wherein the wireless hand-held receiver is replaced by a wireless surveillance camera, the wireless surveillance camera is composed of a camera, a transmission antenna, an amplifier, a modulator to convert the image taken by the camera into an image signal and then amplify the image signal in the amplifier For each of the three bands 200MHZ (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ) and 900MHZ band (928.000MHZ ~ 930.000MHZ) Radio receiver consists of receiving antenna, amplifier, demodulator, phase inverter and level meter, 200MHZ band (217.250MHZ ~ 220.110MHZ), 700MHZ band (740.000MHZ ~ 752.000MHZ), 900MHZ band (928.000MHZ ~ 930.000 Receiving an image signal transmitted at a frequency of MHZ) at a receiving antenna, amplifying the signal at an amplifier, and demodulating the demodulator through a demodulator; A first signal having passed the demodulated image signal of 200MHZ band (217.250MHZ ~ 220.110MHZ) through a phase inverter and then passing 700MHZ band (740.000MHZ ~ 752.000MHZ) and a frequency mixer; A second signal passing through the demodulated image signal of the 200MHZ band (217.250MHZ ~ 220.110MHZ) through a phase inverter and passing through a 900MH band (928.000MHZ ~ 930.000MHZ) and a frequency mixer; A third signal having passed the demodulated image signal of 700 MHZ band (740.000MHZ ~ 752.000MHZ) through a phase inverter and then passing 900MH band (928.000MHZ ~ 930.000MHZ) and a frequency mixer; A first signal, a second signal, and a third signal are passed through the level meter to extract an output signal of a manager input level or higher and input the input signal to a main control unit composed of a microprocessor;  The main control part selects an overlapping frequency band among two corresponding frequency bands of the signal with the least input signal of the manager input level and two corresponding frequency bands of the next lowest signal, and receives the video signal transmitted at the selected frequency. And a video signal received from the amplifier, amplified by the demodulator, and then demodulated and outputted to the digital recording storage device, and the remaining two frequency bands are selected.

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