1. Park wireless broadcasting design 1. Park wireless broadcasting sound source design consists of computer sound source, deck, DVD, digital tuner, microphone, mixer, etc. Users can choose according to the actual situation: configure one deck for tape playback; configure one DVD for VCD, CD, DVD, MP3 and other optical disk playback. Configure one digital tuner for retransmitting the programs of the Central People's Broadcasting Station and local radio stations; configure one mixer, all the audio sources first enter the mixer, and then enter the transmission equipment through the mixer for transmission. The configuration can make all the sound source devices have a systematic and unified management, and can also adjust the volume of the played sound source and correct the timbre of the analog sound source.
Double rotors watch winder, the outer box is made of highly polished wood, with a beautiful dark lacquered finish. Domed lid with acrylic window for easy viewing Normally we could put 2 to
4 watches, it`s suitable for people who own more than two watch, we could put
2-4 watches in the rolling cup for rotating at same time, it`s perfect for
family use, it`s great gift for your family and friends. The watch winder with Japanese
mabuchi motor is very quiet, it would not disturb your sweet dream even you put
the winder in your bedroom.
Watch Winder Safe,Cheap Watch Winder,Diy Watch Winder,Single Watch Winder GUANGZHOU T.WING-PAK MFG.CO.,LTD , https://www.watch-winder-factory.com
2 Park wireless broadcast editing design The audio editing software and computer are combined into a digital audio workstation, which digitizes audio signals, recordings, and line signals, and is compatible with multi-format digital signals in MD, DVD, MP3, and hard disks. Complete high-quality radio programs.
3. Park wireless broadcasting transmitter design The FM broadcasting transmitter used is a high-quality transmitter that has been tested and approved by the National Radio Commission. It uses advanced technologies such as microcomputer phase lock, flash storage, digital error correction, and switching power supply. In particular, its predecessor adopts the most advanced dual-lock frequency sub-carrier remote control coding technology. The frequency is accurate and stable, and the remote control speaker switch is reliable, ensuring that the broadcast system can run steadily all year round.
4. The park wireless broadcasting terminal design FM speakers to listen directly (indoor FM speakers, outdoor FM sound column, FM lawn speakers); FM receivers to constant pressure speakers to listen (outdoor sound column, lawn speakers), this multiple listening mode It embodies the extremely strong compatibility of wireless broadcasting, and can make speakers suitable for individual characteristics in different places.
2. Park wireless broadcasting function 1. Wireless transmission function:
Adopt high-precision frequency PLL broadcast transmitter. The entire broadcasting system does not require poles to be wired, and the installation is simple and convenient.
2. Auto play function:
The digital system timer can be used to set the DVD to play tracks regularly, and the FM radio transmitter can be automatically switched on and off regularly.
4. Remote speaker broadcasting:
Using the most advanced digital coding at present, the remote control speaker automatically switches on and off to ensure accuracy. Can address up to 1024 areas automatically broadcast (can be expanded to countless areas). The receiving end does not need manual operation, and the audience is strong.
5. Mandatory insertion function:
Emergency broadcast notifications for emergencies can be inserted at any time.
6. Unlimited expansion:
Within the effective range covered by the FM signal, countless FM receiver speakers can be used.
Third, the principle of park wireless broadcasting 1. The principle of park wireless broadcasting The intelligent broadcast host broadcasts digital audio, and the analog audio sources such as DVD, deck, microphone, digital tuner broadcast analog audio, which is sent to the mixer for mixing, volume adjustment , Audio retouching, etc. output composite audio signal, FM modulation, excitation amplification and final stage amplification of the high-frequency power signal through the FM broadcast transmitter, and then the high-frequency feed cable or high-frequency waveguide feed tube to the double cross antenna, The antenna element is converted into electromagnetic waves, so that the broadcast signal is transmitted wirelessly in the air.
The intelligent broadcast host sends an RS-232 control signal to the intelligent broadcast controller for control coding and modulation, and then sends it to the FM broadcast transmitter, which performs the same frequency modulation as the audio.
The wireless FM broadcast signal is transmitted in the air in the form of electromagnetic waves. The terminal can play the sound through the wireless FM column, or use the wireless receiver to demodulate the audio signal and power amplify to play through the tweeter. The signal is demodulated and sent to the constant pressure power amplifier to play through the lawn speaker and the constant pressure speaker.
2. Schematic diagram of wireless broadcasting in the park