With the continuous improvement of living standards, more and more families are starting to have 5.1-channel or 7.1-channel home theater systems in the living room.
This article refers to the address: http://
However, for those who are pursuing the cleanliness of the living room, the traditional wired wiring method has brought them a big problem, that is, how to connect 6 or 8 speakers with the amplifier with the audio cable, neither Affect the daily life of the family without damaging the beautiful and neat situation of the living room. Especially for those who want to hang a pair of front or rear speakers at the corners of the wall or have to install a pair of front or rear speakers next door, the traditional wired wiring gives them a bigger The challenge.
In order to help these customers overcome this problem, many suppliers have begun to provide wireless speaker solutions, and a Hong Kong distributor, Chess Harbor Electronics, has recently joined the ranks. Jason Chan, director of electronic marketing at Chess Harbor, said that compared to the existing wireless audio transmission solutions currently on the market, our recently developed complete wireless speaker solutions have the following performance advantages: signal-to-noise ratio greater than 88dB, delay less than 10ms, -3dB frequency point is greater than 20KHz, no loss RF link, continuous transmission of signal in the middle of wireless audio transmission chain without human body barrier, advanced frequency hopping technology to support partition wall transmission, other RF noise sources (such as Bluetooth, mobile phone, digital Cordless phones, microwave ovens, Wi-Fi) have a strong ability to suppress, and the closest distance to the microwave oven can reach 0.3 meters.
Launch board block diagram
This is a highly integrated solution consisting of the transmitter board AT230RFAD, the receiver board AT231RFDA and the power board (optional). The size of the transmitter board and receiver board are only 22.86mm × 45.72mm. The power board is even smaller. It is mainly responsible for changing a stable 5V power supply from AC power, and the cost can be only a few RMB. The transmitter and receiver boards are mainly composed of two chips, one is the ATR2406 2.4GHz RF transceiver, and the other is integrated with the baseband, audio compression/decompression engine and IIS encoder/decoder.
Launchpad AT230RFAD + Receiver Board AT231RFDA
The ATR2406 is a single-chip RF transceiver developed by Atmel for applications operating in the 2.4 GHz ISM band. The chip is a complete transceiver including: image rejection mixer, low IF filter, RSSI, transmit preamplifier, power adjustment generator for external power amplifier, synthesizer, a fully integrated VCO and transmit filter, And a clock recovery circuit. No mechanical adjustments are required for mass production.
The scheme uses ADPCM improved compression algorithm to compress the transmitted audio signal, and can perform lossless compression on small signals with low frequency. The sampling frequency is 48KHz, and the data transmission rate is 1.15Mbps, which can provide extremely smooth CD quality stereo audio signal wireless. transmission. In the absence of an amplifier, the working distance is 2.5-25 meters when the power is 2.5dBm, and can be extended to about 100 meters if there is a power amplifier. The transmitter board provides an audio line input interface, a digital audio input IIS interface, and a USB audio interface. The receiver board provides an audio line output, a digital audio output IIS interface, and a headphone output interface.
The connection between the transmitting board and the receiving board can be automatically established. The working mode is a bit point-to-point, point-to-point, point-to-multipoint, multi-point-to-point, and multi-point to two-point. Point-to-point is the most typical connection mode. The AT230RFAD receives stereo signals from an audio source (such as CD, DVD, MP3, TV or PC) and sends them out. The AT231RFDA receives the left and right channel information and drives the pair of speakers through the audio amplifier. The one-to-two-point mode is mainly used when a pair of front or rear speakers are placed far apart. At this time, two AT231RFDA boards receive left and right channel information and drive the corresponding speakers.
Point-to-multipoint mode is suitable for users who want to play the signal of a single audio source on multiple different speakers (such as front speakers, rear speakers or subwoofers). In this mode, all the receiving boards A matching relationship is established with the transmitting board, and once a pair of connections is established, the other receiving boards automatically enter the waiting mode. If they find that the launchpad is not in an occupied state, they will automatically attempt to establish a connection with the launchpad. The rest of the way.
Point-to-multipoint mode
Energy Efficient Lamps ,High Power Led Bulb ,Energy Saving Bulbs
f.s.c. Technology Corp., Limited , http://www.cfl-manufacturer.com