CN101854182B

CN101854182B - Method for realizing wireless microphone receiver diversity by utilizing noise and diversity system

Info

Publication number: CN101854182B
Application number: CN2010101723067A
Authority: CN
Inventors: 朱成超
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-07
Filing date: 2010-05-07
Publication date: 2012-11-21
Anticipated expiration: 2030-05-07
Also published as: CN101854182A

Abstract

The invention relates to a method for realizing wireless microphone receiver diversity by utilizing noise and diversity system. The method includes that a receiving unit circuit processes a radio frequency signal and then outputs a demodulating signal to a single-pole double-throw switch, the receiving unit circuit also outputs a field intensity signal, and the field intensity signal is input to the two ends of a field intensity comparer by virtue of a low pass filter; a high pass filter filters low frequency component from the demodulating signal and remains high frequency noise component, a direct current voltage in direct proportion with the intensity and amplitude of the high frequency noise component is output by virtue of a noise detector, the direct current voltage controls the opening and close of a single-pole single-throw switch, when the intensity of one radio frequency signal rapidly falls and the direct current exceeds the preset threshold value, the single-pole single-throw switch is grounded, and the single-pole double-throw switch is switched to another demodulating signal. The invention can eliminate action lag caused by field intensity diversity circuit and burst noise produced in rapid falling of radio frequency signal intensity.

Description

Utilize noise to realize the method and the diversity system of wireless microphone receiver diversity

Technical field

The present invention relates to a kind of receiving element that utilizes and demodulate the noise component(s) in the signal to come selective reception to arrive the stronger receipts element method of radiofrequency signal, and the noise diversity system.

Background technology

The deversity scheme of existing wireless microphone; Mainly be that the field intensity signal control audio of utilizing two identical receiving element circuit to be produced is selected commutation circuit, the restituted signal of the receiving element circuit that field intensity signal is high is imported into post processing electric circuit and further handles.Most typical example; Shown in accompanying drawing 1; It is one and has the receiver circuit that field intensity is divided collection control, and two identical receiving element circuit 111 of receiver and 112 reception space radiofrequency signals, the restituted signal that demodulation is come out output to the interior single-pole double-throw switch (SPDT) 117 of audio selection commutation circuit 115; Said receiving element circuit 111 and 112 is also exported a field intensity signal separately; Field intensity signal is through low pass filter 113,114 filtering high fdrequency components, and the filtered field intensity signal of two-way outputs to the field intensity comparator 118 in the audio selection commutation circuit 115; After process field intensity comparator 118 compared, the signal that the receiving element circuit demodulation that field intensity signal is higher of control single-pole double-throw switch (SPDT) 117 is come out was communicated with post processing electric circuit 116.The deversity scheme of this wireless microphone; Because contain audio signal components in the field intensity signal, so minimum will have these audio signal components of one-level low pass filter filters out, and low pass filter has hysteresis characteristic; When RF signal strength drops fast; The audio selection commutation circuit responsiveness of back lags behind radiofrequency signal drop speed, and at this moment, the signal of output is not to receive the stronger receiving element restituted signal that circuit produces of radiofrequency signal.Thereby the burst noise that phenomenon that generation restituted signal change action lags behind and RF signal strength produce when dropping fast.

Summary of the invention

The objective of the invention is: providing a kind of does not have the phenomenon that the restituted signal change action lags behind and takes place, and the noise signal of utilizing that can eliminate burst noise realizes the method for wireless microphone receiver diversity.

Another object of the present invention provides a kind of noise diversity system of realizing said method.

Technical scheme of the present invention is: a kind of method of utilizing noise signal to realize wireless microphone receiver diversity is provided; Utilize the first identical receiving element circuit and the second receiving element circuit difference received RF signal of wireless microphone receiver; The first receiving element circuit is handled the pin that back output first restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The first receiving element circuit is also exported first field intensity signal; Said first field intensity signal by first low pass filter filters out, first high fdrequency component after, be input to first end of field intensity comparator; The second receiving element circuit is handled another pin that back output second restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The second receiving element circuit is also exported second field intensity signal; Said second field intensity signal by second low pass filter filters out, second high fdrequency component after, be input to second end of field intensity comparator; First high pass filter is filtering first low frequency component from first restituted signal that the first receiving element circuit demodulation is come out; Keep first high frequency noise components; First high frequency noise components is through first direct voltage that is directly proportional with the first high frequency noise components magnitude of size of first noise detector output; Said first direct voltage is controlled the switch of first single-pole single-throw switch (SPST) through the first noise comparator; Pin of said first single-pole single-throw switch (SPST) is connected with first end of field intensity comparator, another pin ground connection of said first single-pole single-throw switch (SPST); Second high pass filter is filtering second low frequency component from second restituted signal that the second receiving element circuit demodulation is come out; Keep second high frequency noise components; Second high frequency noise components is through second direct voltage that is directly proportional with the second high frequency noise components magnitude of size of second noise detector output; Said second direct voltage is controlled the switch of second single-pole single-throw switch (SPST) through the second noise comparator; A pin of said second single-pole single-throw switch (SPST) is connected another pin ground connection of said second single-pole single-throw switch (SPST) with second end of field intensity comparator; When RF signal strength is under the normal condition; The field intensity comparator compares the size of first field intensity signal and second field intensity signal; According to comparative result, the restituted signal that the receiving element circuit demodulation that field intensity signal is higher of control single-pole double-throw switch (SPDT) is come out is communicated with post processing electric circuit; When a certain road RF signal strength drops fast; The high frequency noise components proportion increases, and at this moment, the direct voltage that is directly proportional with the high frequency noise components magnitude of size increases; When direct voltage meets or exceeds predetermined threshold value; Corresponding single-pole single-throw switch (SPST) ground connection, field intensity comparator control single-pole double-throw switch (SPDT) and another road restituted signal conducting, the restituted signal of always that received RF signal is stronger receiving element circuit outputs to post processing electric circuit.

Wireless microphone receiver noise diversity system among the present invention; Comprise the first identical receiving element circuit and second receiving element circuit received RF signal respectively; The first receiving element circuit is handled the pin that back output first restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The first receiving element circuit is also exported first field intensity signal, said first field intensity signal by first low pass filter filters out, first high fdrequency component after, be input to first end of field intensity comparator; The second receiving element circuit is handled another pin that back output second restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The second receiving element circuit is also exported second field intensity signal; Said second field intensity signal by second low pass filter filters out, second high fdrequency component after, be input to second end of field intensity comparator; First high pass filter is filtering first low frequency component from first restituted signal that the first receiving element circuit demodulation is come out; Keep first high frequency noise components; First high frequency noise components is through first direct voltage that is directly proportional with the first high frequency noise components magnitude of size of first noise detector output; Said first direct voltage is controlled the switch of first single-pole single-throw switch (SPST) through the first noise comparator; Pin of said first single-pole single-throw switch (SPST) is connected with first end of field intensity comparator, another pin ground connection of said first single-pole single-throw switch (SPST); Second high pass filter is filtering second low frequency component from second restituted signal that the second receiving element circuit demodulation is come out; Keep second high frequency noise components; Second high frequency noise components is through second direct voltage that is directly proportional with the second high frequency noise components magnitude of size of second noise detector output; Said second direct voltage is controlled the switch of second single-pole single-throw switch (SPST) through the second noise comparator; A pin of said second single-pole single-throw switch (SPST) is connected another pin ground connection of said second single-pole single-throw switch (SPST) with second end of field intensity comparator; When RF signal strength is under the normal condition; The field intensity comparator compares the size of first field intensity signal and second field intensity signal; According to comparative result, the conciliation signal that the receiving element circuit demodulation that field intensity signal is higher of control single-pole double-throw switch (SPDT) is come out is communicated with post processing electric circuit; When a certain road RF signal strength drops fast; The high frequency noise components proportion increases; At this moment, the direct voltage that is directly proportional with the high frequency noise components magnitude of size increases, when direct voltage meets or exceeds predetermined threshold value; Corresponding single-pole single-throw switch (SPST) ground connection, field intensity comparator control single-pole double-throw switch (SPDT) and another road restituted signal conducting.

The present invention is owing to adopted the noise diversity control method; Utilize high-pass filtering not have hysteresis characteristic; Even receiver is under the situation that RF signal strength drops fast; The audio selection commutation circuit still can in time be moved, the burst noise that produces when action hysteresis that the field intensity diversity circuit of eliminating is better brought and RF signal strength drop fast.

Description of drawings

Fig. 1 is existing field intensity deversity scheme frame structure sketch map.

Fig. 2 is the frame structure sketch map of noise diversity system of the present invention.

Embodiment

To comprise the contrast of the wireless microphone field intensity diversity circuit and the noise diversity circuit course of work, the enforcement of this method is described below.

See also Fig. 2; What Fig. 2 disclosed is a kind of wireless microphone receiver noise diversity system; Comprise the first identical receiving element circuit 211 and the second receiving element circuit 212; The first receiving element circuit 211 and the second receiving element circuit 212 receive the radiofrequency signal in the space respectively, and the first receiving element circuit 211 is handled first pin that output first restituted signal 227 in back is given single-pole double-throw switch (SPDT) 226 with radiofrequency signal, and the first receiving element circuit 211 is also exported first field intensity signal 229; Said first field intensity signal 229 by first low pass filter, 213 filterings, first high fdrequency component after, be input to first end of field intensity comparator 225; The second receiving element circuit 212 is handled second pin that output second restituted signal 228 in back is given single-pole double-throw switch (SPDT) 226 with radiofrequency signal; The second receiving element circuit 212 is also exported second field intensity signal 230; Said second field intensity signal 230 by second low pass filter, 214 filterings, second high fdrequency component after, be input to second end of field intensity comparator 225; First high pass filter 217 is filtering first low frequency component from first restituted signal 227 that 211 demodulation of the first receiving element circuit are come out; Keep first high frequency noise components; First high frequency noise components is through first direct voltage that is directly proportional with the first high frequency noise components magnitude of size of first noise detector, 219 outputs; Said first direct voltage is through the switch of the first noise comparator, 221 controls, first single-pole single-throw switch (SPST) 223; A pin of said first single-pole single-throw switch (SPST) 223 is connected another pin ground connection of said first single-pole single-throw switch (SPST) 223 with first end of field intensity comparator 225; Second high pass filter 218 is filtering second low frequency component from second restituted signal 228 that 212 demodulation of the second receiving element circuit are come out; Keep second high frequency noise components; Second high frequency noise components is through second direct voltage that is directly proportional with the second high frequency noise components magnitude of size of second noise detector, 220 outputs; Said second direct voltage is through the switch of the second noise comparator, 222 controls, second single-pole single-throw switch (SPST) 224; 224 1 pins of said second single-pole single-throw switch (SPST) are connected with second end of field intensity comparator 225, another pin ground connection of said second single-pole single-throw switch (SPST) 224; When RF signal strength is under the normal condition; Field intensity comparator 225 compares the size of first field intensity signal 229 and second field intensity signal 230; According to comparative result; Control single-pole double-throw switch (SPDT) 226 receiving element circuit (or first receiving element 211 that field intensity signal is higher; Or second receiving element 212) restituted signal that comes out of demodulation (or first restituted signal 227 or second restituted signal 228, be first restituted signal 227 among this figure) is communicated with post processing electric circuit 216, as the signal source of post processing electric circuit 216; When a certain road RF signal strength dropped fast, high frequency noise components proportion in restituted signal increased, at this moment; The direct voltage that is directly proportional with the high frequency noise components magnitude of size increases, and (among the present invention, predetermined threshold value is 1V when direct voltage meets or exceeds predetermined threshold value; Certainly, select for use its predetermined threshold value of different IC also can be different, change and change according to IC; Predetermined threshold value can be selected between 0.5V-5V) time; Noise comparator output high level, corresponding single-pole single-throw switch (SPST) ground connection is made zero the respective ends of field intensity comparator 225 by force; At this moment, field intensity comparator 225 control single-pole double-throw switch (SPDT)s 226 and the receiving element circuit institute demodulation of output noise level lower (just received RF signal is stronger) the restituted signal conducting of coming out.

Among the present invention, the first receiving element circuit and the second receiving element circuit, first low pass filter and second low pass filter, first high pass filter and second high pass filter, first noise detector and second noise detector, the first noise comparator and the second noise comparator, first single-pole single-throw switch (SPST) and second single-pole single-throw switch (SPST) identical.The CD2003 that the first receiving element circuit and the second receiving element circuit can select for use Wuxi Hua Jing company to produce forms the receiving element circuit; First low pass filter and second low pass filter constitute low-pass first order filter by resistance capacitance; First high pass filter and second high pass filter can select for use resistance capacitance and the triode (9014) that long electric company produces to form high pass filter; The peak rectifier circuit that the Schottky diode (BAT54S) that first noise detector and second noise detector can select for use long electric company to produce is formed is as noise detector; The first noise comparator and the second noise comparator can select for use the comparator (YW393) of company of Hangzhou Youwang production as the noise comparator; The CD4066 that first single-pole single-throw switch (SPST) and second single-pole single-throw switch (SPST) can select for use National Semiconductor to produce; The CD4053 that single-pole double-throw switch (SPDT) can select for use National Semiconductor to produce; The field intensity comparator can select for use the comparator (YW393) of company of Hangzhou Youwang production as the field intensity comparator.

Claims

1. method of utilizing noise signal to realize wireless microphone receiver diversity; It is characterized in that: the first identical receiving element circuit and the second receiving element circuit difference received RF signal that utilize wireless microphone receiver; The first receiving element circuit is handled the pin that back output first restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The first receiving element circuit is also exported first field intensity signal; Said first field intensity signal by first low pass filter filters out, first high fdrequency component after, be input to first end of field intensity comparator; The second receiving element circuit is handled another pin that back output second restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The second receiving element circuit is also exported second field intensity signal; Said second field intensity signal by second low pass filter filters out, second high fdrequency component after, be input to second end of field intensity comparator; First high pass filter is filtering first low frequency component from first restituted signal that the first receiving element circuit demodulation is come out; Keep first high frequency noise components; First high frequency noise components is through first direct voltage that is directly proportional with the first high frequency noise components magnitude of size of first noise detector output; Said first direct voltage is controlled the switch of first single-pole single-throw switch (SPST) through the first noise comparator; A pin of said first single-pole single-throw switch (SPST) is connected another pin ground connection of said first single-pole single-throw switch (SPST) with first end of field intensity comparator; Second high pass filter is filtering second low frequency component from second restituted signal that the second receiving element circuit demodulation is come out; Keep second high frequency noise components; Second high frequency noise components is through second direct voltage that is directly proportional with the second high frequency noise components magnitude of size of second noise detector output; Said second direct voltage is controlled the switch of second single-pole single-throw switch (SPST) through the second noise comparator; A pin of said second single-pole single-throw switch (SPST) is connected another pin ground connection of said second single-pole single-throw switch (SPST) with second end of field intensity comparator; When RF signal strength is under the normal condition; The field intensity comparator compares the size of first field intensity signal and second field intensity signal; According to comparative result, the restituted signal that the receiving element circuit demodulation that field intensity signal is higher of control single-pole double-throw switch (SPDT) is come out is communicated with post processing electric circuit; When a certain road RF signal strength drops fast; The high frequency noise components proportion increases, and at this moment, the direct voltage that is directly proportional with the high frequency noise components magnitude of size increases; When direct voltage meets or exceeds predetermined threshold value; Corresponding single-pole single-throw switch (SPST) ground connection, field intensity comparator control single-pole double-throw switch (SPDT) and another road restituted signal conducting, the restituted signal of always that received RF signal is stronger receiving element circuit outputs to post processing electric circuit.

2. the method for utilizing noise signal to realize wireless microphone receiver diversity according to claim 1 is characterized in that: said predetermined threshold value is selected between 0.5V-5V.

3. wireless microphone receiver noise diversity system; Comprise the first identical receiving element circuit and second receiving element circuit received RF signal respectively; The first receiving element circuit is handled the pin that back output first restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The first receiving element circuit is also exported first field intensity signal, said first field intensity signal by first low pass filter filters out, first high fdrequency component after, be input to first end of field intensity comparator; The second receiving element circuit is handled another pin that back output second restituted signal is given single-pole double-throw switch (SPDT) with radiofrequency signal; The second receiving element circuit is also exported second field intensity signal; Said second field intensity signal by second low pass filter filters out, second high fdrequency component after, be input to second end of field intensity comparator; It is characterized in that: first high pass filter is filtering first low frequency component from first restituted signal that the first receiving element circuit demodulation is come out; Keep first high frequency noise components; First high frequency noise components is through first direct voltage that is directly proportional with the first high frequency noise components magnitude of size of first noise detector output; Said first direct voltage is controlled the switch of first single-pole single-throw switch (SPST) through the first noise comparator; A pin of said first single-pole single-throw switch (SPST) is connected another pin ground connection of said first single-pole single-throw switch (SPST) with first end of field intensity comparator; Second high pass filter is filtering second low frequency component from second restituted signal that the second receiving element circuit demodulation is come out; Keep second high frequency noise components; Second high frequency noise components is through second direct voltage that is directly proportional with the second high frequency noise components magnitude of size of second noise detector output; Said second direct voltage is controlled the switch of second single-pole single-throw switch (SPST) through the second noise comparator; A pin of said second single-pole single-throw switch (SPST) is connected another pin ground connection of said second single-pole single-throw switch (SPST) with second end of field intensity comparator; When RF signal strength is under the normal condition; The field intensity comparator compares the size of first field intensity signal and second field intensity signal; According to comparative result, the restituted signal that the receiving element circuit demodulation that field intensity signal is higher of control single-pole double-throw switch (SPDT) is come out is communicated with post processing electric circuit; When a certain road RF signal strength drops fast; The high frequency noise components proportion increases; At this moment, the direct voltage that is directly proportional with the high frequency noise components magnitude of size increases, when direct voltage meets or exceeds predetermined threshold value; Corresponding single-pole single-throw switch (SPST) ground connection, field intensity comparator control single-pole double-throw switch (SPDT) and another road restituted signal conducting.

4. wireless microphone receiver noise diversity system according to claim 3 is characterized in that: said predetermined threshold value is selected between 0.5V-5V.