Anti-interference transmission method for hyperacoustic frequency data having single frequency
A transmission method and super-audio technology, applied in transmission systems, near-field transmission systems, electrical components, etc., can solve the problems of increased sound interruption, wide occupied bandwidth, low RF utilization efficiency, etc. Effect
Inactive Publication Date: 2011-04-13
朱成超
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In order to solve the aforementioned problems, a Chinese patent application discloses a wireless microphone transceiver device (application number: 200310114924.6) with sound code control mute function, which uses two sound codes to form a data signal for data transmission. This way of data transmission, the modulation mode occupies a relatively wide bandwidth, and the efficiency of radio frequency utilization is not high; in addition, only when the input audio code is the same as the preset code, the device can release the mute function of the audio output, so that when the transmitting device is in a dead angle position Or when the distance is long, due to the weakening of the radio frequency signal, there will be certain bit errors in the data, which will cause the receiving device to prohibit the audio output prematurely, increasing the chance of staccato
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0014] The implementation of the method will be described below with the working process including the wireless microphone transmitting device and the receiving device.
[0015] Please refer to Figure 1 and Figure 4, Figure 1 is the circuit structure diagram of the transmitter, Figure 4 is the flow chart of the working process of the transmitter, the pickup 111 converts the audio in the environment into an electrical signal, referred to as an audio signal, this audio signal is relatively weak , the preamplifier 112 amplifies the weak audio signal to the level required by the post-stage circuit. In order to improve the dynamic range and signal-to-noise ratio, the audio signal is pre-emphasized and processed by the compression circuit 113 before entering the mixing stage 114, so that the large The audio signal of the dynamic range is compressed to a limited dynamic range, so that the frequency range occupies a narrower bandwidth; in addition, the microprocessor 122 produces a sin...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
This invention relates to a transmission method for super-sonic data with a single frequency, in which, a transmission device transmits two signals to a receiving device, and one is an audio signal received by an audio pick-up device and the other is a super-sonic one with a single frequency, and the two signals are mixed and modulated to a RF signal to be amplified and radiated to the space and received by the receiving device then to be mixed by a band-pass filter, a low noise amplifier and a first local signal to generate a first IF signal, which is mixed with a second local signal to generate a second IF signal to be demodulated to get a mixed signal of audio and data, the data signal of one path of which is filtered out by the low-pass filter to be output by an audio socket via a mute switch circuit, spread, de-weight and volume adjustment and the other part is output to a microcontroller directly to judge the state of the transmission device and decides if it allows audio output.
Description
technical field [0001] The invention relates to a transmission method of ultra-audio data with a single frequency for anti-interference of a wireless microphone device which can be used in multiple spaces and short distances. Background technique [0002] The existing wireless microphone device transmission methods mainly include infrared wireless transmission and common radio frequency wireless transmission. The main problems of infrared wireless transmission are short distance, strong directionality, poor penetration, inflexible movement of the receiving device, and difficulty in construction and installation. [0003] When ordinary radio frequency wireless microphones are used in multiples, due to the nonlinearity of the mixer, there will be multiple frequencies mixed with each other to generate other frequencies. If this frequency just falls near the set frequency of the receiving device, it will have a negative Interference, thereby outputting audio or noise from other...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04B5/00H04B1/16
Inventor 朱成超
Owner 朱成超