CN202095090U - Device used for emitting audio signals as well as device used for receiving audio signals and wireless audio communicating system - Google Patents
Device used for emitting audio signals as well as device used for receiving audio signals and wireless audio communicating system Download PDFInfo
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- CN202095090U CN202095090U CN2011201905671U CN201120190567U CN202095090U CN 202095090 U CN202095090 U CN 202095090U CN 2011201905671 U CN2011201905671 U CN 2011201905671U CN 201120190567 U CN201120190567 U CN 201120190567U CN 202095090 U CN202095090 U CN 202095090U
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Abstract
The utility model relates to a device used for emitting audio signals as well as a device used for receiving audio signals and a wireless audio communicating system. The wireless audio communicating system comprises an audio emitting device and an audio receiving device, wherein the audio emitting device is used for converting an analog audio signal into a digital audio signal, compressing the dynamic scope of the digital audio signal in a digital compressor, modulating the compressed digital audio signal into a wireless communicating signal and emitting the wireless communicating signal; the audio receiving device is used for receiving the wireless communicating signal, demodulating the wireless communicating signal into the digital audio signal, expanding the dynamic scope of the digital audio signal in a digital expander, converting the expanded digital audio signal into the analog audio signal and converting the analog audio signal into sound information. The utility model can improve the linearity of a compander and simultaneously lead the compander at the emitting end to be better matched with the expander at the receiving end.
Description
Technical field
The utility model relates to microelectronic, relates in particular to a kind of equipment of audio signals, the equipment that is used for received audio signal, wireless audio communication system of being used for.
Background technology
Shown in Figure 1A, structural representation for a kind of wireless microphone transmitter in the prior art, comprise microphone 11, first amplifier 12, analog vco 13 and transmitting antenna 14, the simulated audio signal of microphone 11 outputs amplifies through first amplifier 12, analogue audio frequency voltage signal after the amplification is converted into analog fm signal through analog vco 13, and this analog fm signal is launched through transmitting antenna 14.Shown in Figure 1B, structural representation for a kind of wireless microphone receiver in the prior art, can comprise reception antenna 15, second amplifier 16, frequency mixer 19, analog demodulator 17 and player 18, reception antenna 15 receives analog fm signal, second amplifier 16 amplifies this analog fm signal, frequency mixer 19 is down-converted to fixing intermediate frequency with this analog fm signal, analog fm signal after 17 pairs of frequency conversions of analog demodulator is carried out demodulation and is obtained simulated audio signal, and player 18 is converted into sound with the simulated audio signal after the demodulation.
In emitting-receiving system shown in Figure 1A and Figure 1B, the signal to noise ratio of system is subject to the frequency modulation part of transmitter, and lower as the signal to noise ratio of the voltage controlled oscillator of the frequency modulation of transmitter part, generally below 70dB, thereby make that the signal to noise ratio of this emitting-receiving system is relatively poor.In order to improve the signal to noise ratio of emitting-receiving system shown in Figure 1A and Figure 1B, in emitting-receiving system shown in Figure 1A and Figure 1B, adopted the audio frequency companding technology.The audio frequency companding technology is transmission again after transmitting terminal compresses the dynamic range of the audio signal transmitted effectively, the dynamic range of the audio signal that receives is expanded at receiving terminal again; At transmitting terminal, compressing audio signal not only, and compress extra noise; And, in the extended audio signal, reduce extra noise at receiving terminal; Adopt this technology can produce speech more clearly, make in noisy environment, still can keep unimpeded contact, have very much practical value.
Shown in Fig. 2 A, structural representation for another kind of wireless microphone transmitter in the prior art, on the basis of structural representation shown in Figure 1A, increased analog compressor 21, be connected between first amplifier 12 and the analog vco 13, analog compressor 21 comprises first variable gain amplifier 211 and first full-wave rectifier 212, the input of first variable gain amplifier 211 is connected with first amplifier 12, the output of first variable gain amplifier 211 is connected with analog vco 13, the input of first full-wave rectifier 212 is connected with the output of first variable gain amplifier 211, the output of first full-wave rectifier 212 is connected with the input of first variable gain amplifier 211, and the simulated audio signal after 21 pairs of amplifications of analog compressor compresses.Shown in Fig. 2 B, structural representation for another kind of wireless microphone receiver in the prior art, on the basis of the intention of structure shown in Figure 1B, increased simulative expander 22, be connected between analog demodulator 17 and the player 18, simulative expander 22 comprises second variable gain amplifier 221 and second full-wave rectifier 222, the input of second variable gain amplifier 221 is connected with analog demodulator 17, the output of second variable gain amplifier 221 is connected with player 18, the input of second full-wave rectifier 222 is connected with analog demodulator 17, the output of second full-wave rectifier 222 is connected with the input of second variable gain amplifier 221, and the simulated audio signal after 22 pairs of demodulation of simulative expander is expanded.Wherein, because analog compressor 21 is amplified the ability of weak signal greater than the ability of amplifying strong signal,, reduced signal to noise ratio requirement to radio communication channel so analog compressor 21 has been compressed the dynamic range of signal.Simulative expander 22 is opposite with the effect of analog compressor 21, and simulative expander 22 will be compressed signal and return to former dynamic range.
But there is following defective in emitting-receiving system shown in Fig. 2 A and Fig. 2 B: the linearity of analog compressor and simulative expander is relatively poor; In addition, analog compressor and simulative expander mainly adopt twin-stage type technology integrated circuit and discrete component manufacturing, so the matching degree of analog compressor and simulative expander is relatively poor, and audio signal has produced distortion through compressor reducer and expander.
The utility model content
The utility model provides a kind of equipment of audio signals, the equipment that is used for received audio signal, wireless audio communication system of being used for, in order to realize improving the linearity of compandor, make the compressor reducer of transmitting terminal and the expander of receiving terminal obtain better matching simultaneously.
The utility model provides a kind of equipment that is used for audio signals, comprising:
Analog-digital converter is used for simulated audio signal is converted to digital audio and video signals;
Digital compressor is used to compress the dynamic range of described digital audio and video signals;
Digital modulator is used for the digital audio and video signals after the compression is modulated to wireless communication signals;
Transmitting antenna is used to launch described wireless communication signals.
The utility model also provides a kind of equipment that is used for received audio signal, comprising:
Reception antenna is used to receive wireless communication signals;
Digital demodulator is used for described wireless communication signals is demodulated into digital audio and video signals;
Digital expander is used to expand the dynamic range of described digital audio and video signals;
Digital analog converter is used for the digital audio and video signals after the expansion is converted to simulated audio signal;
Player is used for described simulated audio signal is converted to acoustic information.
The utility model also provides a kind of wireless audio communication system, comprising:
Audio transmitting device is used for simulated audio signal is converted to digital audio and video signals, and the dynamic range of the described digital audio and video signals of compression is modulated to wireless communication signals with the digital audio and video signals after the compression in compressor reducer, launches described wireless communication signals;
Audio reception device, be used to receive described wireless communication signals, described wireless communication signals is demodulated into digital audio and video signals, the dynamic range of the described digital audio and video signals of expansion in expander, digital audio and video signals after the expansion is converted to simulated audio signal, described simulated audio signal is converted to acoustic information.
The utility model has adopted the digital companding device, because digital processing is than the precision height of simulation process, so the linearity of compandor has obtained improving significantly, in addition, because digitized processing is not subjected to the influence of manufacturing process than simulation process, institute is so that the expander of the compressor reducer of transmitting terminal and receiving terminal acquisition better matching.
Description of drawings
Figure 1A is the structural representation of a kind of wireless microphone transmitter in the prior art;
Figure 1B is the structural representation of a kind of wireless microphone receiver in the prior art;
Fig. 2 A is the structural representation of another kind of wireless microphone transmitter in the prior art;
Fig. 2 B is the structural representation of another kind of wireless microphone receiver in the prior art;
Fig. 3 is the structural representation of the utility model wireless audio communication system embodiment;
Fig. 4 is used for the structural representation of the apparatus embodiments of audio signals for the utility model;
Fig. 5 is used for the operation principle schematic diagram of the apparatus embodiments digital compressor of audio signals for the utility model;
Fig. 6 is used for the structural representation of the apparatus embodiments of received audio signal for the utility model;
Fig. 7 is used for the operation principle schematic diagram of the apparatus embodiments digital expander of received audio signal for the utility model.
Embodiment
The utility model will be further described below in conjunction with specification drawings and specific embodiments.
As shown in Figure 3, be the structural representation of the utility model wireless audio communication system embodiment, can comprise audio transmitting device 31 and audio reception device 32, audio reception device 32 is connected by the radio wave airlink with audio transmitting device 31.
In the present embodiment, expander in compressor reducer in the audio transmitting device 31 and the audio reception device 32 has all adopted digital processing, because digital processing is than the precision height of simulation process, so the linearity of compandor has obtained improving significantly, in addition, digitized processing is not subjected to the influence of manufacturing process than simulation process, so that the expander of the compressor reducer of transmitting terminal and receiving terminal obtains better matching.
As shown in Figure 4, the structural representation that is used for the apparatus embodiments of audio signals for the utility model, can comprise analog-digital converter 41, digital compressor 42, digital modulator 43 and transmitting antenna 14, analog-digital converter 41 is connected with sound transducer 40, digital compressor 42 is connected with analog-digital converter 41, digital modulator 43 is connected with digital compressor 42, and transmitting antenna is connected with digital modulator 43.
Wherein, analog-digital converter 41 is used for simulated audio signal is converted to digital audio and video signals; Digital compressor 42 is used for the dynamic range of compression digital audio frequency signal; Digital modulator 43 is used for the digital audio and video signals after the compression is modulated to wireless communication signals, and alternatively, this wireless communication signals is specifically as follows FM signal or amplitude-modulated signal, and preferably, digital modulator 43 is specifically as follows digital vco; Transmitting antenna 14 is used to launch wireless communication signals.
In the present embodiment, analog-digital converter 41 is converted to digital audio and video signals with this simulated audio signal, then, digital compressor 42 is used to compress the dynamic range of this digital audio and video signals, digital audio and video signals after digital modulator 43 will compress again is modulated to wireless communication signals, at last, transmitting antenna 14 these wireless communication signals of emission, present embodiment has adopted digital compressor, because digital processing is than the precision height of simulation process, so the linearity of compandor has obtained raising significantly, in addition, because digitized processing is not subjected to the influence of manufacturing process than simulation process, institute is so that the expander of the compressor reducer of transmitting terminal and receiving terminal acquisition better matching.
Further, in the present embodiment, simulated audio signal can come from two kinds of approach: a kind of approach is directly from the outside input of transmitter; Another kind of approach is that transmitter itself obtains, and referring to schematic diagram shown in Figure 4, present embodiment can also comprise sound transducer 40, is connected with analog-digital converter 41, is used for acoustic information is converted to simulated audio signal.Preferably, sound transducer 40 can be microphone.
Further, again referring to schematic diagram shown in Figure 4, digital compressor 42 can comprise first digital variable gain amplifier 421 and the first digital rectifier 422; First digital variable gain amplifier 421 is connected between analog-digital converter 41 and the digital modulator 43; One end of the first digital rectifier 422 is connected with first digital variable gain amplifier 421, and the other end is connected between first digital variable gain amplifier 421 and the digital modulator 43.
Wherein, first digital variable gain amplifier 421 is used for according to default gain, amplifier digital audio signal.The first digital rectifier 422 is used for that the digital audio and video signals after amplifying is carried out rectification to be handled.First digital variable gain amplifier 421 also is used for according to the digital audio and video signals after the rectification processing, the default gain of control.
Principle below by instantiation explanation digital compressor.As shown in Figure 5, for the utility model is used for the operation principle schematic diagram of the apparatus embodiments digital compressor of audio signals, the amplitude of supposing the input signal of digital compressor is A
In, the amplitude of output signal is A
Out, the gain of digital compressor is G, satisfies following relation:
A
out＝A
in×G
In addition, by adjusting the first digital rectifier 422, make following relational expression set up:
Can derive by above-mentioned two formulas:
As can be seen from the above equation, through after the dynamic range compression, the dynamic range of audio signal is compressed to former dynamic range
For example: the audio signal up to the 110dB dynamic range is compressed into the 55dB dynamic range, can be the FM Channel Transmission of 60dB through signal to noise ratio, thereby realize the transmission of the audio signal of high dynamic range at the low signal-to-noise ratio channel.
In addition, in the present embodiment, preferably, digital compressor 42 can be the digital compressor based on CMOS technology, and cost is low and be convenient to integrated.
As shown in Figure 6, for the utility model is used for the structural representation of the apparatus embodiments of received audio signal, can comprise reception antenna 15, digital demodulator 61, digital expander 62, digital analog converter 63 and player 18.Digital demodulator 61 is connected with reception antenna 15, and digital expander 62 is connected with digital demodulator 61, and digital analog converter 63 is connected with digital expander 62, and player 18 is connected with digital analog converter 63.
In the present embodiment, reception antenna 15 is used to receive wireless communication signals; Digital demodulator 61 is used for wireless communication signals is demodulated into digital audio and video signals; Digital expander 62 is used for the dynamic range of expanding digital audio signal; Digital analog converter 63 is used for the digital audio and video signals after the expansion is converted to simulated audio signal; Player 18 is used for simulated audio signal is converted to acoustic information.
In the present embodiment, after reception antenna 15 receives wireless communication signals, digital demodulator 61 is demodulated into digital audio and video signals with wireless communication signals, then, the dynamic range of digital expander 62 expanding digital audio signals, digital audio and video signals after digital analog converter 63 will be expanded again is converted to simulated audio signal, at last, player 18 is converted to acoustic information with simulated audio signal, present embodiment has adopted digital expander, because digital processing is than the precision height of simulation process, so the linearity of compandor has obtained improving significantly, in addition, because digitized processing is not subjected to the influence of manufacturing process than simulation process, institute is so that the expander of the compressor reducer of transmitting terminal and receiving terminal acquisition better matching.
Nearly step ground, referring to structural representation shown in Figure 5, digital expander 62 can comprise second digital variable gain amplifier 621 and the second digital rectifier 622 again; Second digital variable gain amplifier 621 is connected between digital demodulator and the digital analog converter; Second digital rectifier 622 1 ends are connected with second digital variable gain amplifier, and the other end is connected between second digital variable gain amplifier and the digital demodulator.
Second digital variable gain amplifier 621 is used for according to default gain, amplifier digital audio signal; The digital audio and video signals that the second digital rectifier 622 is used for that demodulation is obtained carries out rectification to be handled; Second digital variable gain amplifier 621 also is used for according to the digital audio and video signals after the rectification processing, the default gain of control.
Operation principle below by instantiation explanation digital expander.As shown in Figure 7, for the utility model is used for the operation principle schematic diagram of the apparatus embodiments digital expander of received audio signal, the amplitude of supposing the input signal of digital expander is A
In, the amplitude of output signal is A
Out, the gain of digital compressor is G, satisfies following relational expression:
A
out＝A
in×G
By adjusting the second digital rectifier 622, make following relational expression set up:
G＝A
in
Can derive by above-mentioned two formulas:
A
out＝A
in 2
As can be seen from the above equation, through after the dynamic range expansion, the dynamic range of audio signal is expanded 2 times into former dynamic range, and for example: the audio signal of 55dB dynamic range is expanded to 110dB.
In addition, in the present embodiment, preferably, digital expander 62 can be the digital expander based on CMOS technology, low price and be convenient to integrated.
It should be noted that at last: above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (10)
1. an equipment that is used for audio signals is characterized in that, comprising:
Analog-digital converter is used for simulated audio signal is converted to digital audio and video signals;
Digital compressor is used to compress the dynamic range of described digital audio and video signals;
Digital modulator is used for the digital audio and video signals after the compression is modulated to wireless communication signals;
Transmitting antenna is used to launch described wireless communication signals.
2. equipment according to claim 1 is characterized in that, described digital compressor comprises:
First digital variable gain amplifier is connected between described analog-digital converter and the described digital modulator, is used for amplifying described digital audio and video signals according to default gain;
The first digital rectifier, an end is connected with described first digital variable gain amplifier, and the other end is connected between described first digital variable gain amplifier and the described digital modulator, is used for that the digital audio and video signals after amplifying is carried out rectification and handles;
Described first digital variable gain amplifier also is used for controlling described default gain according to the digital audio and video signals after the rectification processing.
3. equipment according to claim 1 and 2 is characterized in that, also comprises:
Sound transducer is used for acoustic information is converted to described simulated audio signal.
4. equipment according to claim 1 and 2 is characterized in that, described digital compressor is the digital compressor based on CMOS technology.
5. an equipment that is used for received audio signal is characterized in that, comprising:
Reception antenna is used to receive wireless communication signals;
Digital demodulator is used for described wireless communication signals is demodulated into digital audio and video signals;
Digital expander is used to expand the dynamic range of described digital audio and video signals;
Digital analog converter is used for the digital audio and video signals after the expansion is converted to simulated audio signal;
Player is used for described simulated audio signal is converted to acoustic information.
6. equipment according to claim 5 is characterized in that, described digital expander comprises:
Second digital variable gain amplifier is connected between described digital demodulator and the described digital analog converter, is used for amplifying described digital audio and video signals according to default gain;
The second digital rectifier, an end is connected with described second digital variable gain amplifier, and the other end is connected between described second digital variable gain amplifier and the described digital demodulator, and the digital audio and video signals that is used for that demodulation is obtained carries out rectification to be handled;
Described second digital variable gain amplifier also is used for controlling described default gain according to the digital audio and video signals after the rectification processing.
7. according to claim 5 or 6 described equipment, it is characterized in that described digital expander is specially the digital expander based on CMOS technology.
8. a wireless audio communication system is characterized in that, comprising:
Audio transmitting device is used for simulated audio signal is converted to digital audio and video signals, and the dynamic range of the described digital audio and video signals of compression is modulated to wireless communication signals with the digital audio and video signals after the compression in digital compressor, launches described wireless communication signals;
Audio reception device, be used to receive described wireless communication signals, described wireless communication signals is demodulated into digital audio and video signals, the dynamic range of the described digital audio and video signals of expansion in digital expander, digital audio and video signals after the expansion is converted to simulated audio signal, described simulated audio signal is converted to acoustic information.
9. system according to claim 8 is characterized in that, described digital compressor comprises:
First digital variable gain amplifier is connected between described analog-digital converter and the described digital modulator, is used for amplifying described digital audio and video signals according to default gain;
The first digital rectifier, an end is connected with described first digital variable gain amplifier, and the other end is connected between described first digital variable gain amplifier and the described digital modulator, is used for that the digital audio and video signals after amplifying is carried out rectification and handles;
Described first digital variable gain amplifier also is used for controlling described default gain according to the digital audio and video signals after the rectification processing.
10. system according to claim 8 is characterized in that, described digital expander comprises:
Second digital variable gain amplifier is connected between described digital demodulator and the described digital analog converter, is used for amplifying described digital audio and video signals according to default gain;
The second digital rectifier, an end is connected with described second digital variable gain amplifier, and the other end is connected between described second digital variable gain amplifier and the described digital demodulator, and the digital audio and video signals that is used for that demodulation is obtained carries out rectification to be handled;
Described second digital variable gain amplifier also is used for controlling described default gain according to the digital audio and video signals after the rectification processing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201905671U CN202095090U (en) | 2011-06-08 | 2011-06-08 | Device used for emitting audio signals as well as device used for receiving audio signals and wireless audio communicating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201905671U CN202095090U (en) | 2011-06-08 | 2011-06-08 | Device used for emitting audio signals as well as device used for receiving audio signals and wireless audio communicating system |
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| CN202095090U true CN202095090U (en) | 2011-12-28 |
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| CN2011201905671U Expired - Lifetime CN202095090U (en) | 2011-06-08 | 2011-06-08 | Device used for emitting audio signals as well as device used for receiving audio signals and wireless audio communicating system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361506A (en) * | 2011-06-08 | 2012-02-22 | 北京昆腾微电子有限公司 | Wireless audio communication system, and method and equipment for transmitting audio signal |
| CN103997702A (en) * | 2013-02-18 | 2014-08-20 | 松下电器产业株式会社 | Ultrasonic speaker system |
| CN110364172A (en) * | 2019-07-16 | 2019-10-22 | 建荣半导体（深圳）有限公司 | A kind of method, apparatus that realizing dynamic range control and calculate equipment |
| CN110741432A (en) * | 2017-06-06 | 2020-01-31 | 思睿逻辑国际半导体有限公司 | Apparatus and method for dynamic range enhancement of audio signals |
| US11070183B1 (en) | 2020-03-31 | 2021-07-20 | Cirrus Logic, Inc. | Systems, apparatus and methods for dynamic range enhancement of audio signals |
-
2011
- 2011-06-08 CN CN2011201905671U patent/CN202095090U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361506A (en) * | 2011-06-08 | 2012-02-22 | 北京昆腾微电子有限公司 | Wireless audio communication system, and method and equipment for transmitting audio signal |
| CN103997702A (en) * | 2013-02-18 | 2014-08-20 | 松下电器产业株式会社 | Ultrasonic speaker system |
| CN103997702B (en) * | 2013-02-18 | 2015-10-14 | 松下电器产业株式会社 | Ultrasonic wave speaker system |
| CN110741432A (en) * | 2017-06-06 | 2020-01-31 | 思睿逻辑国际半导体有限公司 | Apparatus and method for dynamic range enhancement of audio signals |
| CN110741432B (en) * | 2017-06-06 | 2021-04-27 | 思睿逻辑国际半导体有限公司 | Apparatus and method for providing an output signal to an audio transducer and electronic device |
| US11064293B2 (en) | 2017-06-06 | 2021-07-13 | Cirrus Logic, Inc. | Systems, apparatus and methods for dynamic range enhancement of audio signals |
| CN110364172A (en) * | 2019-07-16 | 2019-10-22 | 建荣半导体（深圳）有限公司 | A kind of method, apparatus that realizing dynamic range control and calculate equipment |
| CN110364172B (en) * | 2019-07-16 | 2022-01-25 | 建荣半导体（深圳）有限公司 | Method and device for realizing dynamic range control and computing equipment |
| US11070183B1 (en) | 2020-03-31 | 2021-07-20 | Cirrus Logic, Inc. | Systems, apparatus and methods for dynamic range enhancement of audio signals |
| US11528002B2 (en) | 2020-03-31 | 2022-12-13 | Cirrus Logic, Inc. | Systems, apparatus and methods for dynamic range enhancement of audio signals |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: KUNTENG MICROELECTRONIC CO., LTD. Free format text: FORMER NAME: KT MICRO, INC. |
|
| CP03 | Change of name, title or address |
Address after: 100195 Beijing, Yuquan, No. 23 Haidian District Road, building No. 4 Patentee after: KT MICRO INC.(BEIJING) Address before: 100097 Beijing city Haidian District landianchang Road No. 2 Jin Yuan Times Business Center No. 2 building B, 8 A, B Patentee before: KT Micro, Inc. |
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| CX01 | Expiry of patent term |
Granted publication date: 20111228 |
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| CX01 | Expiry of patent term |