CN102932704A - Audio emission chip, audio receiving chip and wireless microphone system - Google Patents
Audio emission chip, audio receiving chip and wireless microphone system Download PDFInfo
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Abstract
The invention relates to an audio emission chip, an audio receiving chip and a wireless microphone system. The audio emission chip comprises an emission front-end processing module for performing dynamic range contraction processing on an audio signal, modulating auxiliary information, and superposing the processed audio signal and the modulated auxiliary information to obtain a composite signal, and a modulator for modulating the composite signal into a radio frequency signal according to a channel selection signal, wherein the frequency of the modulated auxiliary information is different from that of the audio signal; and the emission front-end processing module and the modulator are integrated in a single integrated circuit. The audio emission chip can emit and receive the audio signal and the auxiliary information at the same.
Description
Technical field
The present invention relates to microelectronic, relate in particular to a kind of audio frequency transmitting chip, audio frequency receiving chip and wireless microphone system.
Background technology
When people carry out exchange activity in larger spaces such as meeting room, stages, the acoustic energy of sending because of natural sound source (such as speech, instrument playing and performance etc.) is limited, its sound pressure level is rapidly decay along with the increase of propagation distance, add the impact of ambient noise, make the propagation distance of sound shorter, therefore need to use microphone that the signal of sound source is amplified, effectively improve the sound pressure level in the sound field scope, increase the propagation distance of sound.Microphone is divided into two kinds of wire microphone and wireless microphones, and wherein, wireless microphone is widely used owing to carry and use all more conveniently.The operation principle of wireless microphone is to adopt microphone to be converted into audio signal from the voice signal of sound source, and this audio signal is gone out with electromagnetic form this radiofrequency signal by antenna after audio transmitter is modulated to radiofrequency signal from air-launched.This electromagnetic wave carries out demodulation through voice receiver and obtains audio signal by behind the antenna reception, and this audio signal is sent to loud speaker and is converted into sound.The audio signal of wireless microphone transmission is generally the high-fidelity signal, and frequency is 20Hz ~ 20KHz.
Wireless microphone also needs to transmit some supplementarys except needs transmission of audio signal, such as: the information such as operation of cell voltage, switching on and shutting down, volume adjusting, lighting system, thus user-friendly.But how in the transmission of audio signal, supplementary to be transmitted, still do not have effective solution.
Summary of the invention
The invention provides a kind of audio frequency transmitting chip, audio frequency receiving chip and wireless microphone system, simultaneously audio signal and supplementary are transmitted and received in order to realization.
The invention provides a kind of audio frequency transmitting chip, comprising:
The front end of emission processing module, be used for audio signal is carried out the dynamic range shrink process, supplementary is modulated, audio signal after processing and the supplementary after the modulation are superposeed, obtain composite signal, wherein, the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
Modulator is used for according to channel selecting signal, and described composite signal is modulated to radiofrequency signal;
Described front end of emission processing module and described modulator are integrated in the single integrated circuit.
The present invention also provides a kind of audio frequency launching technique, comprising:
Audio signal is carried out the dynamic range shrink process, supplementary is modulated, the audio signal after processing and the supplementary after the modulation are superposeed, obtain composite signal, wherein, the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
According to channel selecting signal, described composite signal is modulated to radiofrequency signal;
Above-mentioned steps realizes in single integrated circuit.
The present invention also provides a kind of audio frequency receiving chip, comprising:
The receiving front-end processing module is used for according to channel selecting signal, and the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process;
Demodulator, be used for the signal of described receiving front-end processing module output is carried out demodulation process, obtain composite signal, wherein, described composite signal is audio signal after the dynamic range shrink process and the stack of supplementary after the modulation, and the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
Audio processing modules is used for that described composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion and processes, and obtains audio signal;
The supplementary processing module is used for described composite signal is carried out filtering and demodulation process, obtains supplementary;
Described receiving front-end processing module, described demodulator, described audio processing modules and described supplementary processing module are integrated in the single integrated circuit.
The present invention also provides a kind of audio interface receiving method, comprising:
According to channel selecting signal, the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process;
Signal after down-converted and the analog-to-digital conversion process is carried out demodulation process, obtain composite signal, wherein, described composite signal is audio signal after the dynamic range shrink process and the stack of supplementary after the modulation, and the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
Described composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion process, obtain audio signal;
Described composite signal is carried out filtering and demodulation process, obtain supplementary;
Above-mentioned steps realizes in single integrated circuit.
The present invention also provides a kind of portable equipment with audio frequency transmitting chip, comprising:
The channel option interface;
Audio input interface;
Aforementioned audio frequency transmitting chip;
The radiofrequency signal output interface.
The present invention also provides a kind of portable equipment with audio frequency receiving chip, comprising:
The radiofrequency signal input interface;
The channel option interface;
Aforesaid audio frequency receiving chip;
The audio signal output interface;
The supplementary output interface.
The present invention also provides a kind of wireless communication system, comprises audio transmitter and voice receiver, and described audio transmitter comprises aforesaid audio frequency transmitting chip, and described voice receiver comprises aforesaid audio frequency receiving chip.
The present invention also provides a kind of wireless microphone system, comprises microphone, audio transmitter and voice receiver, and described audio transmitter comprises aforesaid audio frequency transmitting chip, and described voice receiver comprises aforesaid audio frequency receiving chip.
In the present invention, at transmitting terminal, at first, audio signal is carried out the dynamic range shrink process, supplementary is modulated, the audio signal after processing and the supplementary after the modulation are superposeed, then according to channel selecting signal, signal after the stack is modulated to radiofrequency signal, thus emission when having realized audio signal and auxiliary signal.At receiving terminal, at first, according to channel selecting signal, the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process, signal after processing is carried out demodulation process, obtain composite signal, then, composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion process, obtain audio signal, composite signal is carried out filtering and demodulation process, obtain supplementary, thereby realized simultaneously the reception of audio signal and supplementary.
Description of drawings
Fig. 1 is the structural representation of audio frequency transmitting chip the first embodiment of the present invention;
Fig. 2 is the structural representation of audio frequency transmitting chip the second embodiment of the present invention;
Fig. 3 is the structural representation of audio frequency transmitting chip the 3rd embodiment of the present invention;
Fig. 4 is the schematic flow sheet of audio frequency launching technique the first embodiment of the present invention;
Fig. 5 is the schematic flow sheet of audio frequency launching technique the second embodiment of the present invention;
Fig. 6 is the schematic flow sheet of audio frequency launching technique the 3rd embodiment of the present invention;
Fig. 7 is the schematic flow sheet of audio frequency launching technique the 4th embodiment of the present invention;
Fig. 8 is the structural representation that the present invention has the portable equipment embodiment of audio frequency transmitting chip;
Fig. 9 is the structural representation of audio frequency receiving chip the first embodiment of the present invention;
Figure 10 is the structural representation of audio frequency receiving chip the second embodiment of the present invention;
Figure 11 is the structural representation of audio frequency receiving chip the 3rd embodiment of the present invention;
Figure 12 is the structural representation of audio interface receiving method the first embodiment of the present invention;
Figure 13 is the structural representation of audio interface receiving method the second embodiment of the present invention;
Figure 14 is the schematic flow sheet of audio interface receiving method the 3rd embodiment of the present invention;
Figure 15 is the schematic flow sheet of audio interface receiving method the 4th embodiment of the present invention;
Figure 16 is the structural representation that the present invention has the portable equipment embodiment of audio frequency receiving chip;
Figure 17 is the structural representation of wireless communication system embodiment of the present invention;
Figure 18 is the structural representation of wireless microphone system embodiment of the present invention.
Embodiment
The invention will be further described below in conjunction with specification drawings and specific embodiments.
As shown in Figure 1, be the structural representation of audio frequency transmitting chip the first embodiment of the present invention, this audio frequency transmitting chip can comprise front end of emission processing module 11 and modulator 12.Front end of emission processing module 11 and modulator 12 are integrated in the single integrated circuit, and this integrated circuit can adopt complementary metal oxide semiconductors (CMOS) (CMOS) technique, BiCMOS technique or any other to want the technique that adopts or the combination of technique to realize.
Wherein, front end of emission processing module 11 is used for audio signal is carried out the dynamic range shrink process, supplementary is modulated, audio signal after processing and the supplementary after the modulation are superposeed, obtain composite signal, wherein, the frequency of the supplementary after the modulation is different from the frequency of audio signal.Modulator 12 is used for according to channel selecting signal, and composite signal is modulated to radiofrequency signal.
Particularly, the frequency range of audio signal is 20Hz ~ 20KHz, is idle frequency range from 0 ~ 20Hz and the frequency range more than the 20kHz, according to the characteristics of wireless transmission, can send supplementary by this free time frequency range.For example: the shared frequency range of the supplementary after the modulation is 30KHz ~ 40KHz, and the frequency range with audio signal has certain interval like this, reduces to disturb.In addition, when 11 pairs of supplementarys of front end of emission processing module are modulated, can adopt binary phase shift keying (Binary Phase Shift Keying, be called for short: BPSK) modulation, amplitude shift keying (amplitude shift keying, be called for short: (frequency shift keying, be called for short: FSK) modulation or any other are wanted the modulation system that adopts for ASK) modulation, frequency shift keying.Modulator 12 can be frequency modulator or amplitude modulator, for example: frequency synthesizer (synthesizer), phase-locked loop etc.
Transmitting terminal for high dynamic range, with the maximal audio signal as a reference, the low energy of the amplitude of audio signal is to-110dBfs, and the amplitude of the noise of wireless transmitting system generally has-60dBfs, if be left intact, the audio frequency small-signal will be submerged in the noise.The audio frequency companding technology amplifies the audio frequency small-signal at transmitting terminal, and it is relevant with small signal amplitudes to gain, and signal is less, and it is larger to gain.Such as, the audio signal of-110dBFS is amplified to-55dBFS, the audio signal of-80dBFS is amplified to-40dBv, and the signal of 0dBFS still keeps 0dBv.Like this, the transmitting terminal minimum signal also has-55dBFSv, is higher than-noise of 60dBv, and audio signal dynamic range is guaranteed.Corresponding therewith, to receive signal times at receiving terminal and gain to reduce audio signal with corresponding expansion, the expansion gain is relevant with the signal amplitude that receives, signal is less, the expansion gain is lower, such as ,-55dBv signal extension arrives-110dBv, the signal extension of-40dBv arrives-80dBv, and the 0dBv signal still keeps 0dBv.
In the present embodiment, 11 pairs of audio signals of front end of emission processing module are carried out the dynamic range shrink process, supplementary is modulated, audio signal after processing and the supplementary after the modulation are superposeed, then, modulator 12 is modulated to radiofrequency signal according to channel selecting signal with the signal after the stack, thus emission when having realized audio signal and auxiliary signal.
Again referring to Fig. 1, present embodiment is on the basis that comprises front end of emission processing module 11 and modulator 12, can also comprise analog to digital converter 13, be connected with front end of emission processing module 11, be used for audio signal is carried out analog-to-digital conversion, the audio signal after the analog-to-digital conversion is sent to front end of emission processing module 11.This analog to digital converter 13 together is integrated in the integrated circuit with front end of emission processing module 11 and modulator 12.
Again referring to Fig. 1, present embodiment is on the basis that comprises front end of emission processing module 11 and modulator 12, perhaps on the basis that comprises front end of emission processing module 11, modulator 12 and analog to digital converter 13, can also comprise power amplifier 14, be connected to the output of modulator 12, be used for the radiofrequency signal of modulator 12 outputs is carried out power amplification.The gain of power amplifier 14 can be fixed value, also can be adjustable.Power amplifier 14 together is integrated in the single integrated circuit with front end of emission processing module 11 and modulator 12, and perhaps power amplifier 14 together is integrated in the single integrated circuit with front-end processing module 11, modulator 12 and analog to digital converter 13.
Further, again referring to Fig. 1, front end of emission processing module 11 can comprise dynamic range contraction unit 111, supplementary modulator 112 and adder 113.Adder 113 is shunk unit 111 with dynamic range respectively and is connected with the supplementary modulator and is connected.
Wherein, dynamic range is shunk unit 111 for audio signal is carried out the dynamic range shrink process; Supplementary modulator 112 is used for supplementary is modulated; Adder 113 is used for the supplementary after the audio signal after the dynamic range shrink process and the modulation is superposeed.
As shown in Figure 2, structural representation for audio frequency transmitting chip the second embodiment of the present invention, be with the difference of a upper embodiment, front end of emission processing module 11 is except carrying out the dynamic range contraction audio signal, can also before dynamic range is shunk, carry out preemphasis to audio signal and process, at this moment, can also comprise pre-emphasis unit 114 in the front end of emission processing module 11, be connected to dynamic range and shrink the input of unit 111, be used for that audio signal is carried out preemphasis and process.At this moment, dynamic range is shunk unit 111 for the audio signal after the preemphasis processing is carried out the dynamic range shrink process.
As shown in Figure 3, structural representation for audio frequency transmitting chip the 3rd embodiment of the present invention, be with the difference of a upper embodiment, front end of emission processing module 11 is carried out preemphasis to audio signal and is processed after dynamic range is shunk, pre-emphasis unit 114 is connected to the output that dynamic range is shunk unit 111, is used for that the audio signal after the shrink process is carried out preemphasis and processes; At this moment, adder 113 is used for the audio signal after the preemphasis processing and the supplementary after the modulation are superposeed.
As shown in Figure 4, the schematic flow sheet for audio frequency launching technique the first embodiment of the present invention can comprise the steps:
Wherein, the frequency of the supplementary after the modulation is different from the frequency of audio signal.
In step 42, can proportion the mode of modulation or amplitude modulation(PAM), composite signal is modulated to radiofrequency signal.
Alternatively, can also comprise the steps: after the step 42
Wherein, step 41 can be carried out by the front end of emission processing module 11 among Fig. 1, and step 42 can be carried out by the modulator 12 among Fig. 1, and step 43 can be carried out by the power amplifier 14 among Fig. 1.
Present embodiment carries out the dynamic range shrink process to audio signal first, supplementary is modulated, supplementary after audio signal after processing and the modulation superposeed obtain composite signal, then according to channel selecting signal, composite signal is modulated to radiofrequency signal, thus emission when having realized audio signal and auxiliary signal.
As shown in Figure 5, for the schematic flow sheet of audio frequency launching technique the second embodiment of the present invention, on the basis of schematic flow sheet shown in Figure 4, can also comprise the steps: before the step 41
As shown in Figure 6, be the schematic flow sheet of audio frequency launching technique the 3rd embodiment of the present invention, be that with the difference of schematic flow sheet shown in Figure 4 step 41 is specifically as follows following steps:
In step 61, can carry out preemphasis to audio signal first and process, the audio signal after again preemphasis being processed is carried out the dynamic range shrink process, and this process can be carried out by front end of emission processing module 11 shown in Figure 2; Perhaps, first audio signal is carried out the dynamic range shrink process, and then the audio signal after the dynamic range shrink process is carried out preemphasis process, this process can be carried out by front end of emission processing module 11 shown in Figure 3.
As shown in Figure 7, be the schematic flow sheet of audio frequency launching technique the 4th embodiment of the present invention, be that with the difference of schematic flow sheet shown in Figure 5 step 41 is specifically as follows following steps:
In step 61, can carry out preemphasis to audio signal first and process, the audio signal after again preemphasis being processed is carried out the dynamic range shrink process, and this process can be carried out by front end of emission processing module 11 shown in Figure 2; Perhaps, first audio signal is carried out the dynamic range shrink process, and then the audio signal after the dynamic range shrink process is carried out preemphasis process, this process can be carried out by front end of emission processing module 11 shown in Figure 3.
As shown in Figure 8, the structural representation for the present invention has the portable equipment embodiment of audio frequency transmitting chip can comprise channel option interface 81, audio input interface 82, audio frequency transmitting chip 83 and radiofrequency signal output interface 84.Channel option interface 81, audio input interface 82 and radiofrequency signal output interface are connected and are connected with audio frequency transmitting chip 83 respectively.
Wherein, channel option interface 81 is used for input channel selection signal; Audio input interface 82 is used for input audio signal; Audio frequency transmitting chip 83 is used for audio signal is carried out the dynamic range shrink process, supplementary is modulated, supplementary after audio signal after processing and the modulation superposeed obtain composite signal, according to channel selecting signal, composite signal is modulated to radiofrequency signal, wherein, the frequency of the supplementary after the modulation is different from the frequency of audio signal; Radiofrequency signal output interface 84 is used for the output radiofrequency signal.
Further, this portable equipment is specifically as follows the wireless microphone transmitter.
Need to prove that audio frequency transmitting chip 83 can for aforementioned audio frequency transmitting chip embodiment, not repeat them here.
As shown in Figure 9, be the structural representation of audio frequency receiving chip the first embodiment of the present invention, this audio frequency receiving chip can comprise receiving front-end processing module 91, demodulator 92, audio processing modules 93 and supplementary processing module 94.Demodulator 92 is connected with receiving front-end processing module 91, and audio processing modules 93 is connected with the supplementary processing module and is connected with demodulator 92 respectively.Receiving front-end processing module 91, demodulator 92, audio processing modules 93 and supplementary processing module 94 can be integrated in the single integrated circuit.This integrated circuit can adopt complementary metal oxide semiconductors (CMOS) (CMOS) technique, BiCMOS technique or any other to want the technique that adopts or the combination of technique to realize.
Receiving front-end processing module 91 is used for according to channel selecting signal, and the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process, and this radiofrequency signal can be amplitude-modulated signal or FM signal; Demodulator 92 is used for composite signal is carried out demodulation process, obtain composite signal, wherein, composite signal is audio signal after the dynamic range shrink process and the stack of supplementary after the modulation, the frequency of the supplementary after the modulation is different from the frequency of audio signal, and when radiofrequency signal was amplitude-modulated signal, demodulator 92 was AM demodulator, when radiofrequency signal was FM signal, demodulator 92 was FM demodulator; Audio processing modules 93 is used for that baseband signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion to be processed, and obtains audio signal; Supplementary processing module 94 is used for baseband signal is carried out filtering and demodulation process, obtains supplementary.Wherein, in composite signal, the frequency range of audio signal is 20 ~ 20KHz, and the frequency range of auxiliary signal is different from the frequency range of audio signal.In the present embodiment, the frequency range of auxiliary signal is 30KHz ~ 40KHz.
In the present embodiment, receiving front-end processing module 91 is according to channel selecting signal, the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process, the signal that 92 pairs of demodulators receive 91 outputs of front-end processing module carries out demodulation process, obtain composite signal, 93 pairs of composite signals of audio processing modules are carried out filtering, dynamic range expansion and digital-to-analogue conversion and are processed, obtain audio signal, 94 pairs of composite signals of supplementary processing module are carried out filtering and demodulation process, obtain supplementary, thereby realized simultaneously the reception of audio signal and supplementary.
Further, receiving front-end processing module 91 can comprise down-converter unit 911 and analog to digital converter 13.Wherein, down-converter unit 911 is used for according to channel selecting signal, and the radiofrequency signal that receives is carried out down-converted; Analog to digital converter 13 is used for the signal after the down-converted is carried out digital-to-analogue conversion.Down-converter unit 911 can be constructed to super-heterodyne architecture, if architectures or zero-if architecture.
At transmitting terminal, after audio frequency small-signal dynamic range compression, outside voice-grade channel, increase auxiliary channel and jointly launch, at receiving terminal, the signal that receives is the stack of audio frequency small-signal and auxiliary signal.Adopted the receiving terminal of audio frequency companding technology to determine the expansion gain according to the signal amplitude that receives, with reduction audio frequency small-signal.But the auxiliary signal that superposes on the audio frequency small-signal can affect receiving terminal to the judgement of signal amplitude, thereby affects the expansion gain of receiving terminal, so that the expansion gain is low not, can not effectively reduce the receiving terminal noise, thereby worsen dynamic range.Give an example, suppose that the transmitting terminal dynamic range is 110dB, the noise small-signal of transmitting terminal emission-110dBv, through latitude reduction technique, the main signal amplitude in the channel is-55dBv.Add auxiliary channel this moment, the signal amplitude of supposing auxiliary channel is-20dBv, so in signal amplitude that receiving terminal is seen for about-20dBv, expansion that receiving terminal provides gain has just been become by-55dB and has been-20dB, through expansion, the noise signal amplitude that obtains is-75dBv, so the dynamic range of receiving terminal has become 75dB by 110dB.In order to reduce auxiliary channel to the impact of audio signal dynamic range, adopt 921 pairs of composite signals of low pass filter to carry out low-pass filtering, from composite signal, isolate audio signal, adopt 931 pairs of composite signals of high pass filter to carry out high-pass filtering, from composite signal, isolate supplementary.Because the frequency range of supplementary and the frequency range of audio signal are more close, the transition band of required filter is narrow, if adopt the analog filtering mode, the circuit design difficulty is high, circuit scale is large, and in the present embodiment, low pass filter 921 and high pass filter 931 are digital filter, the circuit design difficulty is lower, and circuit scale is less.
As shown in figure 10, structural representation for audio frequency receiving chip the second embodiment of the present invention, be with the difference of structural representation shown in Figure 9, audio signal after the dynamic range shrink process is the audio signal after preemphasis processing and the dynamic range shrink process, that is to say, audio signal was once carried out dynamic range at transmitting terminal and was shunk and the double processing of preemphasis, audio processing modules 93 is used for the audio signal after preemphasis processing and the dynamic range shrink process is carried out filtering, dynamic range expansion, postemphasis and process and the digital-to-analogue conversion processing, obtain audio signal.Audio processing modules 93 can comprise low pass filter 931, de-emphasis unit 934, dynamic range expansion unit 932 and the digital to analog converter 933 that is connected in series successively.Wherein, low pass filter 931 is used for composite signal is carried out low-pass filtering; De-emphasis unit 934 is for processing that the signal after the low-pass filtering is postemphasised; Dynamic range expansion unit 932 is used for the signal that postemphasises after processing is carried out the dynamic range expansion processing; Digital to analog converter 933 is used for the signal after the dynamic range expansion processing is carried out digital-to-analogue conversion, obtains audio signal.
As shown in figure 11, be the structural representation of audio frequency receiving chip the 3rd embodiment of the present invention, be that with the difference of structural representation shown in Figure 10 dynamic range expansion unit 932 is connected between low pass filter 931 and the de-emphasis unit 934.Low pass filter 931 is used for composite signal is carried out low-pass filtering; Dynamic range expansion unit 932 is used for that the signal after the low-pass filtering is carried out dynamic range expansion to be processed; De-emphasis unit 934 is for processing that the signal after the dynamic range expansion processing is postemphasised; Digital to analog converter 933 is used for the signal that postemphasises after processing is carried out digital-to-analogue conversion, obtains audio signal.
As shown in figure 12, the structural representation for audio interface receiving method the first embodiment of the present invention can comprise the steps:
Step 1201, according to channel selecting signal, the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process;
Wherein, this radiofrequency signal can be FM signal or amplitude-modulated signal, and down-converted can be the down-converted of superhet mode, intermediate frequency mode or zero intermediate frequency mode;
Wherein, composite signal is audio signal after the dynamic range shrink process and the stack of supplementary after the modulation, the frequency of the supplementary after the modulation is different from the frequency of audio signal, when radiofrequency signal is amplitude-modulated signal, what this step was carried out is amplitude demodulation, when radiofrequency signal was FM signal, what this step was carried out was frequency demodulation;
Step 1203, composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion is processed, obtain audio signal;
Step 1204, composite signal is carried out filtering and demodulation process, obtain supplementary;
Wherein, can adopt BPSK demodulation, ASK demodulation, FSK demodulation or any other demodulation mode of wanting to adopt that filtered composite signal is carried out demodulation.
There is not strict sequential relationship between step 1203 and the step 1204.
Step 1201 can be carried out by receiving front-end processing module 91 shown in Figure 9, and step 1202 can be carried out by demodulator 92, and step 1203 can be carried out by audio processing modules 93, and step 1204 can be carried out by supplementary processing module 94.
In the present embodiment, first according to channel selecting signal, the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process, again the signal after processing is carried out demodulation process, obtain composite signal, at last composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion and process, obtain audio signal, simultaneously composite signal is carried out filtering and demodulation process, obtain supplementary, thereby receive when having realized audio signal and supplementary.
As shown in figure 13, for the structural representation of audio interface receiving method the second embodiment of the present invention, on the basis of schematic flow sheet shown in Figure 12, step 1201 can comprise the steps:
This step can be carried out by down-converter unit shown in Figure 9 911;
This step can be carried out by analog to digital converter shown in Figure 9 13.
Step 1203 can comprise the steps:
This step can be carried out by the low pass filter 931 among Fig. 9;
This step can be carried out by the dynamic range expansion unit 932 among Fig. 9;
This step can be carried out by the digital to analog converter 933 among Fig. 9.
Step 1204 can comprise the steps:
This step can be carried out by the high pass filter 941 among Fig. 9;
This step can be carried out by the supplementary demodulator 942 among Fig. 9.
As shown in figure 14, schematic flow sheet for audio interface receiving method the 3rd embodiment of the present invention, be with the difference of step 12031-12033 in the schematic flow sheet shown in Figure 13, audio signal after the dynamic range shrink process is the audio signal after preemphasis processing and the dynamic range shrink process, therefore except composite signal being carried out filtering, dynamic range expansion and digital-to-analogue conversion processing, also need the processing of postemphasising, this step can comprise the steps:
This step can be carried out by the low pass filter 931 among Figure 10;
This step can be carried out by the de-emphasis unit 934 among Figure 10;
This step can be carried out by the dynamic range expansion unit 932 among Figure 10;
This step can be carried out by the digital to analog converter 933 among Figure 10.
As shown in figure 15, schematic flow sheet for audio interface receiving method the 4th embodiment of the present invention, be with the difference of step 12031-12033 in the schematic flow sheet shown in Figure 13, except composite signal being carried out filtering, dynamic range expansion and digital-to-analogue conversion processing, also to the composite signal processing of postemphasising, this step can comprise the steps:
This step can be carried out by the low pass filter 931 among Figure 11;
This step can be carried out by the dynamic range expansion unit 932 among Figure 11;
The processing of postemphasising of step 1503, the signal after dynamic range expansion processed;
This step can be carried out by the de-emphasis unit 934 among Figure 11;
This step can be carried out by the digital to analog converter 933 among Figure 11.
As shown in figure 16, for the present invention has the structural representation of the portable equipment embodiment of audio frequency receiving chip, can comprise channel option interface 81, radiofrequency signal input interface 161, audio frequency receiving chip 162 and audio signal output interface 163, supplementary output interface 164.Channel option interface 81, radiofrequency signal input interface 161, audio signal output interface 163 and supplementary output interface are connected and are connected with audio frequency receiving chip 162 respectively.
Channel option interface 81 is used for input channel and selects signal; Radiofrequency signal input interface 161 is used for the input radio frequency signal; Audio frequency receiving chip 162 is used for according to channel selecting signal, the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process, signal after down-converted and the analog-to-digital conversion process is carried out demodulation process, obtain composite signal, composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion to be processed, obtain audio signal, composite signal is carried out filtering and demodulation process, obtain supplementary; Wherein, composite signal is audio signal after the dynamic range shrink process and the stack of supplementary after the modulation, and the frequency of the supplementary after the modulation is different from the frequency of described audio signal; Audio signal output interface 163 is used for output audio signal; Supplementary output interface 164 is used for the output supplementary.
Audio frequency receiving chip 162 can for the audio frequency receiving chip among the arbitrary embodiment of aforementioned audio frequency receiving chip, not repeat them here.
Further, this portable equipment can be wireless microphone receiver.
As shown in figure 17, structural representation for wireless communication system embodiment of the present invention, this wireless communication system can comprise audio transmitter 171 and voice receiver 172, audio transmitter is connected radio communication and is connected with voice receiver, wherein, comprise the audio frequency transmitting chip among the arbitrary embodiment of aforementioned audio frequency transmitting chip in the audio transmitter 171, comprise the audio frequency receiving chip among the arbitrary embodiment of aforementioned audio frequency receiving chip in the voice receiver 172, do not repeat them here.
As shown in figure 18, structural representation for wireless microphone system embodiment of the present invention, comprise microphone 180, audio transmitter 171 and voice receiver 172, wherein, comprise the audio frequency transmitting chip among the arbitrary embodiment of aforementioned audio frequency transmitting chip in the audio transmitter 171, comprise the audio frequency receiving chip among the arbitrary embodiment of aforementioned audio frequency receiving chip in the voice receiver 172, do not repeat them here.
It should be noted that at last: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1. an audio frequency transmitting chip is characterized in that, comprising:
The front end of emission processing module, be used for audio signal is carried out the dynamic range shrink process, supplementary is modulated, audio signal after processing and the supplementary after the modulation are superposeed, obtain composite signal, wherein, the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
Modulator is used for according to channel selecting signal, and described composite signal is modulated to radiofrequency signal;
Described front end of emission processing module and described modulator are integrated in the single integrated circuit.
2. an audio frequency launching technique is characterized in that, comprising:
Audio signal is carried out the dynamic range shrink process, supplementary is modulated, the audio signal after processing and the supplementary after the modulation are superposeed, obtain composite signal, wherein, the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
According to channel selecting signal, described composite signal is modulated to radiofrequency signal;
Above-mentioned steps realizes in single integrated circuit.
3. an audio frequency receiving chip is characterized in that, comprising:
The receiving front-end processing module is used for according to channel selecting signal, and the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process;
Demodulator, be used for the signal of described receiving front-end processing module output is carried out demodulation process, obtain composite signal, wherein, described composite signal is audio signal after the dynamic range shrink process and the stack of supplementary after the modulation, and the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
Audio processing modules is used for that described composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion and processes, and obtains audio signal;
The supplementary processing module is used for described composite signal is carried out filtering and demodulation process, obtains supplementary;
Described receiving front-end processing module, described demodulator, described audio processing modules and described supplementary processing module are integrated in the single integrated circuit.
4. an audio interface receiving method is characterized in that, comprising:
According to channel selecting signal, the radiofrequency signal that receives is carried out down-converted and analog-to-digital conversion process;
Signal after down-converted and the analog-to-digital conversion process is carried out demodulation process, obtain composite signal, wherein, described composite signal is audio signal after the dynamic range shrink process and the stack of supplementary after the modulation, and the frequency of the supplementary after the described modulation is different from the frequency of described audio signal;
Described composite signal is carried out filtering, dynamic range expansion and digital-to-analogue conversion process, obtain audio signal;
Described composite signal is carried out filtering and demodulation process, obtain supplementary;
Above-mentioned steps realizes in single integrated circuit.
5. the portable equipment with audio frequency transmitting chip is characterized in that, comprising:
The channel option interface;
Audio input interface;
Audio frequency transmitting chip claimed in claim 1;
The radiofrequency signal output interface.
6. portable equipment according to claim 5 is characterized in that, described portable equipment is the wireless microphone transmitter.
7. the portable equipment with audio frequency receiving chip is characterized in that, comprising:
The radiofrequency signal input interface;
The channel option interface;
Audio frequency receiving chip claimed in claim 3;
The audio signal output interface;
The supplementary output interface.
8. portable equipment according to claim 7 is characterized in that, described portable equipment is wireless microphone receiver.
9. a wireless communication system comprises audio transmitter and voice receiver, it is characterized in that, described audio transmitter comprises audio frequency transmitting chip claimed in claim 1, and described voice receiver comprises audio frequency receiving chip claimed in claim 3.
10. wireless microphone system, comprise microphone, audio transmitter and voice receiver, it is characterized in that described audio transmitter comprises audio frequency transmitting chip claimed in claim 1, described voice receiver comprises audio frequency receiving chip claimed in claim 3.
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| CN2012104173091A CN102932704A (en) | 2012-10-26 | 2012-10-26 | Audio emission chip, audio receiving chip and wireless microphone system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104173091A CN102932704A (en) | 2012-10-26 | 2012-10-26 | Audio emission chip, audio receiving chip and wireless microphone system |
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| CN102932704A true CN102932704A (en) | 2013-02-13 |
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| CN2012104173091A Pending CN102932704A (en) | 2012-10-26 | 2012-10-26 | Audio emission chip, audio receiving chip and wireless microphone system |
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Application publication date: 20130213 |