TWI358954B - Remote control of phantom power supplied microphon - Google Patents

Description

1358954 IX. Description of the Invention: [Technical Field] The present invention relates to a method for remote control of a microphone, the microphone comprising at least one microphone diaphragm, and at least one additional power receiver selected from an audio amplifier, a power supply circuit, a processor, an electronic controller, an A/D and D/A converter, an LED display, etc., and the energy supply thereof is transmitted by an analog power supply unit through a cable conductor of an audio cable, so-called analog power supply supply. [Prior Art] The microphone power supply is conventionally provided by a power supply source (for example) using a mixer. During the simulation of the power supply, the anode of the feed voltage is applied by two identical feed resistors via the two electrical retarders of the audio cable. The return of the power/claw is generated by a third conductor connected to the pin of the XLR plug. In order to be able to effectively use the voltage supplied by the simulated power supply and used for the power supply of the condenser microphone, the current consumption of the microphone should be as small as possible to prevent excessive voltage drop on the feed resistor. The maximum current consumption of the 48·ν condenser microphone is 1 〇 mA. The simulated power supply is standardized here according to DIN ΕΝ 61938 (here IEC 268). In order to generate a polarization voltage on the microphone film, the value is usually in the range of 20-100 volts dc, mainly using a combination circuit component or a voltage converter. The remaining electronic microphones are typically powered by a linear regulated supply that feeds the feed or maintains the supply current at a predetermined value. This type of power supply is suitable because the microphone has very little power consumption. This linear adjustment becomes problematic when the power consumption in the microphone is increased, for example, by using a processor, an A/D converter, a led display, etc. 100303-1000714.doc 1358954. In this case, most of the energy obtained by the supply of the simulated power is broken in the linear adjustment element. However, according to this standard, since the simulated power supply is limited in its current due to the feed resistance, the maximum supply voltage for the audio amplifier drops immediately due to linear adjustment within the microphone, which results in the maximum of the microphone The output voltage is reduced. An additional problem consists of the generation of a polarization voltage. A voltage is typically applied to the microphone film by a high ohmic resistor. Here, the power required is very low. High-efficiency voltage regulators for generating polarization voltages that are virtually powerless are also difficult to construct. An additional problem involves the remote control of the microphone. For microphones, there is a growing need to adjust or change important microphone parameters via remote control. These parameters include the polarization voltage on the film and the associated sensitivity of the condenser microphone, the directional characteristics of the microphone 'the type of simulated power supply (12 v, 24 V or 48 V), the number, the calibration data from the manufacturer, and the weakening of the signal. And connectable filters for audio signals. DE 3 933 870 A1 discloses a method for remote control of a microphone parameter, such as an orientation feature, a stepping sound filter or a preliminary damping. In this process, the supply voltage delivered to the cable conductor is adjusted via the remote control unit, for example, in the mixer in a manner that represents the control information for the microphone. On the side of the microphone, the supply voltage is decoupled and applied to an evaluation circuit that generates a control signal as a function of the amount of supply voltage. By means of this data transfer, only a small amount of control information can be transmitted to the microphone. And therefore only a few parameters can be remotely controlled in the microphone. 100303-10Q07i4.doc 1358954 US 6 028 946 A (and corresponding EP Ο 794 686 A2) discloses a digital microphone. The audio signal is digitized by an analog digital converter and generated

The two-channel digital audio signal is transmitted to the associated amplifier via a symmetric two-wire conductor. The power supply to the microphone is provided via the thus symmetrical two-wire conductor. By the way, it is implicitly mentioned that in the associated amplifier, the pulses are modulated to the voltage of the microphone power supply, which acts as a remote control for the microphone setting. It should be noted in this paper that the concept of digital microphone and the sequential transmission of digital signals are different from analog microphones in which analog signals are transmitted via analog power lines. Since the digital audio signal can be easily separated from the additional modulated signal, the transmission of the additional modulated signal on a line does not cause any problem, and the digital signal is simultaneously transmitted via the line.

- The extra (not yet best solved) problem involves the generation of a polarized voltage on a condenser microphone film. The level of the polarization voltage is directly incorporated into the sensitivity level of the microphone diaphragm. As a result, it is also possible to adjust the sensitivity of the diaphragm of the capacitor by means of the polarization voltage. The use of a dual film diaphragm is particularly advantageous in the case of independent supply of individual films having a polarized voltage, since this isopy film not only allows adjustment of the sensitivity but also allows adjustment of the orientation features. It is known how to adjust the polarization voltage by means of a fixed lightning resistance or an adjustment resistor. In this process, an adjustment of the polarization voltage occurs during the Lectra wind and the Weinong. Here, the directional characteristic system is determined in advance by the ratio of the solid resistance. Using this method, it is possible but difficult but difficult to assemble by the assembly of the wheat-free snow-free membrane and the tolerance within the sensitivity caused by the aging process. For this purpose, the compensation of the polarization voltage will be required in the acoustic quantity of sensitivity. The measurement period 'in the state of the microphone assembly & different orientation characteristics is also not 100303-1000714.doc 1358954 may compensate for the sensitivity tolerance" US 4,541,112 A (and the corresponding EP 0 096 778 B1) reveals a An electroacoustic transducer system that adjusts the pulse generator that converts the DC current to an AC current. A transformer connected to the pulse generator allows inductive disassembly of individual power receivers. The supply loops are inductively coupled to the alternating current generated by the pulse generator by separate coils on the transformer. This document is included in the present description in the manner of introduction. SUMMARY OF THE INVENTION In connection with microphone power supply, a solution is needed in which a power supply obtained by the simulated power supply is optimally used and converted into an operating voltage required by an individual output receiver, such as an audio amplifier, a microphone diaphragm, Processor, controller, A/D converter, LED display, etc. Here, the purpose is to be able to use as much of the power as possible from the supply of the simulated power supply for supplying the audio amplifier. Such a purpose is achieved by a microphone comprising a power supply circuit for an individual power supply receiver, the microphone being characterized in that the power supply circuit comprises a control unit that converts direct current transmitted via a cable conductor of the audio cable into An alternating current; a transformer connected to the control unit; and a supply loop for the individual power receivers, wherein the supply loop is inductively coupled to the alternating current generated by the control unit by the independent coils on the transformer and coupled to each other. In the process, all the voltages required by the above power receivers are generated by an electric supply circuit (for example, a DC/DC converter), and the power supply circuit has ', the lower special I · raw. U 胄 s simulation power supply unit exists A power-adjustable way to adjust the system 100303-1000714.doc 1358954 or operate the power supply circuit. Therefore ^ ^ simulation power supply unit to obtain the maximum monthly power supply can always be consumed by the microphone. 'Power supply circuit. The supply circuit has a constant primary current consumption of 1 。. In terms of the simulated power supply unit, the power supply circuit thus acts as a constant choke. The power supply circuit is used for individual supply (7) supply circuits for individual power supply receivers. The transformer is decoupled & 'to meet the individual power receivers 夕丁门办_ different needs of the pirates: high lightning voltage and low current for polarization voltage with as little power loss as possible, moderate for audio amplifiers Voltage and moderate electric cleaning, acre red electricity into flat consumption, and small lightning pressure and large current for digital electronics. The beneficial effects are obvious: using the power supply concept already given, the electrical power obtained by the simulated power supply unit is optimally used. As a result, the microphone can be equipped with new functions (eg remote control, new operational concepts, automatic compensation possibilities, etc.) At the same time, the maximum audio output power of the microphone remains the same; no power on the body (pc>we plus e) is generated by the simple extra coil on the transformer actually as a secondary product. The result of a potentially high ohmic level can be easily achieved by setting the power supply at the input of the power supply circuit. The switch rippie of the power supply circuit or the DC/DC converter is issued. The possibility of tweaking in the microphone, such as changing the polarization voltage and thus the sensitivity, continuously changing the orientation characteristics of the double film and changing the control signal of the microprocessor for storing the correction data, and modifying the frequency range and the maximum audio output. Voltage, amplification, or THD of the audio amplifier requires a substantially higher data transfer rate to be transmitted to the microphone via remote control According to the present invention, the objects are achieved by a remote control method of a microphone, the special 100303-1000714.doc 1358954 is characterized in that the frequency modulation (four) is - a control signal is applied to one of the two electron microscope guides, by The simulated power supply is also generated by applying a frequency modulation voltage to the electronic controller on the microphone side, such as a microcontroller or CPLD (complex programmable logic device), which sends an instruction to the individual according to the frequency modulation control number Power receiver. In this method, the frequency modulation voltage is overlaid on the supply (4) of the simulated power supply. The data is transmitted from the transmitter (which is configured, for example, in the mixer or in the device before mixing n) ) occurs via the audio line to the microphone. The carrier frequency used here for FSK modulation is higher than the range of audio frequencies transmitted by the microphone. /, the transmission of rectus electromyography, in contrast, can achieve a substantially higher data transfer rate by using frequency modulation signals. As a result, many parameters can be transmitted using a protocol. The carrier frequency used for modulation is preferably about kHZ, and it can be isolated from the audio signal by a filter. In order to meet the need for low tolerance in the polarization voltage of the fused microphone - for example, sensitivity, a tolerance of -4 dB is required - a solution is required, which allows the polarization even in the assembled state of the microphone Flexible adjustment of electricity. According to the invention, this is achieved by an electric microphone, which is characterized in that the electric valley microphone comprises at least one circuit for receiving a mixed polarization voltage, wherein the circuit pack for polarization voltage regulation, 匕3 with an unregulated voltage - a ratio control loop, and a digital A loop, characterized in that the digital loop contains a lightning early, such as: (for example, a microcontroller or CPLD) its analogy The tuned loop provides a required 100303-10007i4.doc 1358954 for the polarization voltage calculated using the modified calibre coefficient.

The value is, and for the purpose of feedback, the analogy loop of the analog loop is connected to the controller. ^ A During this process, the polarization voltage is adjusted by a voltage regulation loop integrated in the microphone. In this circuit the desired value of the polarization voltage is converted via d/a: pre-established by the electronic controller. As a result, the precision of the polarization house can be performed: level adjustment. The desired value of the polarization voltage can also be transmitted to the controller by remote control. The tolerance of the acquired polarization M is currently dependent on the reference voltage and thermal behavior. The polarization control voltage is adjusted in each microphone via the digital control adjustment loop, + = the polarization voltage of the microphone is very accurate, anti-interference and can be adjusted remotely: ":" during the manufacturing process and in the measurement technology verification of the condenser microphone Very narrow tolerance requirements for sensitivity and orientation characteristics are available. The polarized voltage of the polarization voltage can be improved by the fixed resistance or the modulation of m tannins. The existing solution of positively affecting the stomach and the polarized electricity with a fixed setting is the following additional possibility of the electric microphone of the mine according to the present invention. The function of the characteristic makeup T T 个 碉 碉 碉 特征 特征 特征 特征 特征 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可The polarization can be stored in the acoustic ft Mb Π B 冉 入 储存 储存 储存 储存 τ τ τ τ τ U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U The performance of the microphone and the microphone can be, for example, sounded to the performer who moves with the heart. l〇0303-l〇〇〇7i4.d〇c 1358954 The condenser microphone according to the present invention allows the microphone to be caused by aging The re-correction of sensitivity without the need to disassemble the microphone's again means cost savings for the user. During microphone diaphragm replacement, the original sensitivity of the microphone can then be re-adjusted by the remote after (ie after incorporation) [Embodiment] Fig. 1 is a block diagram showing the main components of a microphone according to the present invention. The microphone emulation power supply shown in Fig. 5 is executed by the emulation supply unit n by feed resistors 32, 33 having the same magnitude. The feeds 4, 33 are placed after the 3 pole plug 4 (eg (10) plug) in or before the mixer. The simulated power supply is shown in Figure 5. According to the standard, three simulated power supply systems Possible • The relevant tool for the feed resistors supplied by 12々, 2" or 48_v is J 680 Ω, 1·2 kQ or 6.8 kQ. Here lines! and 2 represent the cable supplied by the simulation supply unit Conductor; line 3 The table is usually connected to the grounding wire of the grounded electrical shielding material. By means of audio (4), that is, by means of the wire 2 and the resistors 5 and 6', the simulation power supply unit is connected to the power supply circuit u ^ input according to the invention. The grounding makes the supply age ^ resistance... is the feeding resistor in the wheat wind. It is used to decouple the input from the audio amplifier = microphone power supply. The feeding resistor (8) of the microphone is assigned as the additional internal power supply 31 When the internal resistance of the simulated power supply unit is the same as the internal resistance of the power supply circuit u in the microphone, the power is in. Therefore, in the power adjustment condition, one of the simulated power supply is supplied by the analog: η! supply circuit u This power, which is the maximum that can be generated by the snow, is distributed by the power supply circuit 11 in the form of a DC/DC converter to all of the energy consuming components in the microphone. 100303-I0007i4.doc The excess power here can be used with the audio amplifier 10 to achieve the highest possible microphone output voltage as high as possible. Regarding the different power supply voltages (according to the standard 12 V, 24 V or 48 V), the circuit can be designed in such a way that the power supply to different simulated power supplies is automatically generated. This task is then received by the control unit 12, described below. The power supply circuit 11 includes a power source 13, a control unit 12, and a transformer 14 connected to the control unit 12. The control unit 12 together with the transformer 丨4 • forms a circuit unit in which the DC voltage is converted to an AC voltage. In this case, the voltage regulator is part of the oscillation generating circuit, and naturally, the alternating current can also be generated by the control unit 12 independently of the transformer. The control unit 12 is then composed of an oscillating ring independent of the transformer and which produces an alternating current. The transformer only performs the function of converting the parent current to an individual output voltage. In a preferred embodiment, the AC signal has a frequency in the range of 1 〇〇 13 () kHz. The AC signal can also oscillate freely; this represents the possibility of the simplest embodiment of this circuit. The only important factor is that the frequency range of the AC signal must be outside the frequency range of the sound ft so that it does not cause any interference to the audio signal that cannot be eliminated by simple filtering. On the other hand, the frequency should not be too high, otherwise the efficiency of the circuit is reduced and transmission interference is expected to occur. An additional advantage of using a frequency of 100-130 kHz is that this frequency can also be applied to the periodic pulses of the electronic controller 39 provided in the microphone. As a result, the interference signal generated by the digital technique can be minimized because no additional mixed product is generated between the digital cycle time and the oscillation frequency of the D c / D c converter. The generated AC signal is applied to the transformer 14. As a result of the individual 100303-l000714.doc •13- independent coil on the transformer, an independent current loop is generated. 67, supply individual energy consuming components. This decoupling allows for the supply of components requiring high voltage but low current consumption, as well as components with high current consumption and low voltage, by as much as possible. The diodes 18, 19, 2 and the capacitors 2, 22 23 in the individual supply circuits 15, 16, 17 represent rectifier circuits for converting the AC voltage to a DC voltage. Naturally, the more complex and efficient power circuits from the time of the patent application can be provided in individual supply circuits. The supply circuit 16 is used to supply a polarization voltage to the microphone diaphragm 9, which is applied to the microphone diaphragm 9 via the resistor 8. The invention is of course not limited to condenser microphones' because any kind of microphone (portary, especially dynamic microphone) can be connected to the simulated power supply. The individual power receivers are supplied by the emulated power supply unit in the same manner as shown in Figures 1 and 2. However, in the case of a dynamic microphone, the polarization voltage is not necessary, so the supply loop 16 is not required. The constant current generator 13 is used at the input of the DC/DC converter to ensure constant primary current absorption. About the simulation power supply unit 31, constant current generator

充田良疋电/瓜瓜槽 and it represents a constant electric μ generator for the power supply circuit. The constant current generator 13 has as high an ohmic level as possible, simplifies the filtering of the switching chopping generated during the Dc/Ac conversion and thus simultaneously prevents interference coverage on the audio signal. Electronic components of this type are well known to those skilled in the art and familiar with the state of the art at the time of filing a patent. The state of the art at the time of applying for a patent is shown in Figures 3 and 4 using a circuit example of a && A current generator. Figure 3 shows an electro-thoracic LED 'definite current generator with a bipolar transistor. By the current generator, the LED 100303-10〇〇714.di 1358954 operates in the flow direction, and the voltage is also applied to the transistor having the emitter but a constant voltage is applied to the LED, the resistor of the resistor The current delivered by the connected base emitter body by the current generator is therefore J = (ULED Ubc) / Re ' where the voltage on the Ule4 LED drops, Ubc is the base emitter voltage, and Re is the emitter resistance. The circuit in Fig. 4 contains one. (( mutually defined, 丨疋 々丨 • • • • • • • • • • • • • • • • • • • • , , , , , , , , , , , , , , , , , , , , , , Additional integrated constant current generator 30

This circuit is better; I: due to consideration, 9 constant current and higher initial resistance

Better features. The current generator 3A produces a voltage drop across the preliminary resistance Rc equal to the voltage drop URC across the emitter resistance Re of the transistor 28. Here, the current of the current generator is IWRe. Here, the body 29 and the transistor 28 together form an opposite coupling degradation system that ensures the same voltage drop across the resistors Rc and Re. As a result, the current of the current generator "also remains constant for $. The current produced by the current generator is therefore j times smaller than the constant current flowing into the DC/DC converter 11. Naturally, other types of constants are also available. A current generator, for example, an eight-inverted six-operation amplifier, a current generator, a current generator, etc. a supply voltage for the audio amplifier 10 is generated in a preferred embodiment. Not regulated. In the supply loop 16 of the microphone diaphragm 9, an adjustment circuit 47, 48 is provided between the pole body 18 and the resistor 8, which includes a digital adjustment loop 47 and an analog adjustment loop 48 for application to the microphone. The polarization voltage of the diaphragm 9 is provided. Figure 6 illustrates the preferred remote control circuit 47, 48 in conjunction with Figure 7. The control signal required to adjust the polarization voltage can be obtained by 100303-1000714.doc 15 1358954 two cable conductors At least one of transmissions 1 and 2. The detailed structure and operation method of the adjustment circuit 47 48 are further described below. Adjustment circuits may also be provided in the remaining supply circuit, the limiting conditions being current and voltage limits. Not provided in the digital circuit components. In the preferred embodiment of Figures 2 and 2, no adjustment circuitry is provided for the audio amplifier 10 in the supply loop 15. As a result, the full power - which is not used for other circuit components, such as a processor The electronic controller 39, the polarization voltage at the microphone diaphragm 9, the A/D or D/A converters 44, 46, and the LED display 25 can be used for the audio amplifier 1 〇. As a result, the high maximum audio output voltage can be in the audio. Amplifier 1〇 current saving design is achieved to achieve a high maximum audio output voltage. In principle, the supply voltage result for the audio amplifier 10 can also exceed the voltage obtained by the simulated power supply. The method may also generate very simple positive and negative supply voltages for the audio amplifier 10. As a result, the audio amplifier 10 may also use ground as the rest potential. The supply voltage of the audio amplifier (1〇) may thus be related to ground. Symmetrical. In a more advantageous embodiment, the DC/DC converter u of the type described above operates at an efficiency of about 82% because even in the most advantageous form The power is also lost on the DC/DC converter, so it is advantageous to connect (if possible) consumable components to the DC/DC converter. As a result of using the constant current generator j 3, it is easy to consume the components and constant Current consumption (e.g., logic supply Μ) is connected to obtain a fixed direct current (e.g., electronic controller 39 or LED display 25, A/D or D/A converter 44, 46 for use in series with a DC/DC converter 丨丨A corresponding embodiment of the power supply circuit u is shown in Fig. 2. The difference between 100303 and 1000714.doc compared to Fig. 2 is that only the polarization voltage and the voltage for the audio amplifier 10 can be generated by a DC/DC converter. Other consumable components, such as logic supply 24 for obtaining a predetermined predetermined direct current (e.g., for electronic controller 39 or LED display 25), are coupled in series with the DC/DC converter. The series-connected DC/DC converter 11 for digital supply acts as an active load resistor, wherein the energy used for this resistor is not converted to heat but is converted to the available supply power and microphone for the audio amplifier 10 in most proportions. The polarization voltage on the film 9. As shown in Figure 2, in conjunction with a logic supply 24 for obtaining a reference voltage or additional digital electronics, a Zener diode 27 is provided which is particularly suitable for a fixed voltage. By this diode 27, any current that is not consumed but is delivered by the constant current generator 13 is released to the ground. In principle, any other constant current generator or shunt regulator that replaces the Zener diode 27 can be used. The power released is the product of the current of the constant current generator 13 and the voltage applied to the power supply circuit 11. In the block diagram of Fig. 1, all of the voltage is applied to the DC/DC converter 11 and all voltages are generated by a DC/DC converter. In the block diagram of Fig. 2, the voltage is divided into a portion applied to the DC/DC converter 11 and applied to the LED 25 and the second portion of the digital supply. The DC/DC converter represents the active preliminary resistance for LED 25 or digital supply. Since the current consumption of the digital supply is not constant, the current I is kept constant by the current generator 13, and the excess current (depending on the operational state of the digital electronics) must be exuded by the Zener diode 27. As far as the supply of the audio amplifier 10 is concerned, the power P = I X can be used in the efficiency of the voltage of the DC/DC converter X DC/DC converter. For LEDs and digital electronics, the power P = Ix is available on the digital electronics and on the LEDs. 100303-1000714.doc •17· 丄 D8954 For illustrative purposes, an example is given: in the uncontrolled state, the current consumption of the audio amplifier 10 is about 〇8 mA, and the current consumption of the digital electronics is about 4 2 mA. The current generator 13 delivers a constant current of about 4.7 mA. Therefore, in this particular case, it is more advantageous to direct the voltage for the digital electronics without the DC/DC converter, but to use the serial connection to the DC/DC converter. In addition, in subsequent developments, with regard to energy it may evolve to: it is more advantageous to direct all required voltages by a DC/DC converter, as shown in the block diagram of the figure. The conversion of the supply voltage for the audio amplifier 10 produces the maximum available power for the amplifier in this case: p = 47mAxl8Vx〇82 = 69 mW»so the voltage at the audio amplifier 1〇 is u = p/I = 69 mW/0.8 mA = 55 V. This voltage is higher during the power adaptation than the 24 V voltage delivered by the simulated power supply unit 31. However, since the polarization voltage is also generated on the film of the diaphragm 9, the value of the supply voltage of the audio amplifier 1 (which is actually achieved) is lower than this value, but still much higher than in the no DC/DC conversion. 24 V available. Figure 5 shows microphone 54' which is coupled to a transmitter or remote unit 55. The remote control of each important microphone parameter is transmitted directly via the audio cable (i.e., via line 2). Control unit 55 is preferably on the mixer or in front of it. A microcontroller 35 having a parameter control input 34 controls a frequency modulator 36 that feeds frequency modulation signals having the same level to the two cable conductors 1, 2 of the audio cable. The frequency modulation signal can then be suppressed to a common mode signal in the input differential amplifier 42. At the same time, the supply voltage of the pseudo power supply unit 31 is applied to the two cable conductors 1, 2 via the feed resistors 32, 33. In the preferred embodiment, only the frequency modulation signal is applied to the conductors in the audio cable, conductor 2, which is not intended for use in audio signals. In a preferred embodiment, the frequency modulation signal is generated by FSK (Frequency Shift Keying) or CPFSK (Continuous Phase FSK). Both modulations are self-digital data sent to the program known to the technology. In principle, it is also possible to use ask (amplitude shift keying) or PSK (phase shift keying) modulation. However, ASK is highly likely to be subject to interference, and PSK modulation is more difficult to perform from the point of view of circuit technology. Contrary to the well-known application of the above method, the key factor in the use of the microphone is that the modulation signal must be separated from the analog signal (audio signal). Even if the frequency modulation signal is only fed into the conductor 2 which is not intended for the audio signal, the electrical connection between the two conductors of the audio cable causes the audio signal to interfere. The capacitive surface depends on the composition and length of the audio cable. Therefore, although the control signal is already well known, it is still difficult to filter out the interference. In the microphone, the frequency modulation voltage is isolated from the audio signal by a chopper 37 (eg, a bandpass chopper) and contains control information by an electronic controller 39 (eg, a microcontroller or CPLD (complex) The programmable logic device is evaluated. The cable conductor 2 is self-grounded by the capacitor 43. The electronic controller % is connected to the front of the comparator 38 serving as the voltage comparator. The command output by the electronic controller 39 ( For example, reaching the power supply circuit 11 (as seen in (1)), the audio amplifier 10, the processor, the electronic control II39, the A/D or D/A converters 44, 46, etc. on the two audio lines 1, 2 The frequency modulation is performed in a remote control unit 55 preferably located near the mixer. In one aspect, at the remote control unit 55, the carrier frequency must be applied in the direction toward the microphone 54, and on the other hand, in the mix 100303-1000714. Doc • 19- 1358954 The direction of the frequency converter must be suppressed for all modulation frequencies. Only the audio signal from the microphone 54 must be transmitted. In order to make the suppression of the modulation frequency simpler, two audio lines with the same level are included. Execute As a result, the frequency modulation signal appears as a common mode signal in the remote control unit 55 for inputting the differential amplifier 42 and thus it can be appropriately suppressed as a common mode signal. In the second variant of the remote control, the frequency The modulation occurs only in the line that does not transmit the audio signal (ie, line 2). In this variation, the frequency modulation signal can be cancelled by the low pass filter 41 by the chopper in the direction toward the mixer. The emulation power supply unit 31 (including the feed resistors 32, 33) and the differential amplifier 42 and the low pass data filter need not be integrated in the remote control unit as shown in Fig. 5. For example, it can also be provided in the mixer. During the transmission of the control signal from the remote control unit 55 to the microphone 54, in order to ensure that the control signal actually reaches the electronic controller 39, in response to the control signal electronic controller 39, a data confirmation message is sent to the remote control unit. It can also be a frequency modulation signal. For remote control functions (4) Erguang: It is absolutely necessary; however, it increases the reliability of the system at the expense of additional electronic devices. However, it is not limited to any type of capacitor (especially a dynamic microphone). The receiver can be operated by simulating the power supply. 彳 Power supply The microphone according to the present invention can be connected to any standard imitation without affecting the microphone. Function. If the simulation power supply package is in, 遂: and the device, then the transfer (10) can be remote (four) 4 any other towel remote = wind can be operated by the switch directly mounted on the microphone. Medium, Mike 100303-1000714.doc - 20- 1358954 shows a condenser microphone not according to the present invention, which allows adjustment of the polarization electrons by means of a two-step control loop. Here, the second digital adjustment loop 47 covers the internal analog adjustment loop. . As a result, it has become possible to produce appropriately adjusted, anti-interference polarized electricity on the microphone diaphragm:

The electronic frequency controller 39 is connected to the electronic controller 39 by the chopper 37 and the comparator 38 by the cable guide and also connected to the emulation power unit to have the preferred frequency modulation signal for controlling the lean. A detailed description of the remote control of the microphone according to the invention has been provided above, especially in Figure 5. Control of the electronic controller 39 can also occur via an adjustment device or operating element on the microphone itself. It is also possible that the electronic controller is connected to the radio or radio line for wireless transmission or to the electrical winding interface. The control signal of the polarization voltage is: the value is transmitted via the D/A converter 46 by electronic control (4). A pulse width modulation circuit (PMW) can be used in addition to the D/A converter. Although PWM circuits have lower slew rates, they are less expensive and are therefore well suited for adjusting the odds of alignment in such converters. Figure 7 is an example of an embodiment showing how an electronic controller 39 (e.g., a microcontroller or cpLD) plus a D/A converter or 1> side 46 acts on an analog adjustment loop. A number of analogy adjustment circuits are known in the state of the art at the time of the patent application, and it is easy for those skilled in the art to familiarize themselves with the art to select a size for this adjustment circuit. As shown in Fig. 6, 夕+咅α _ τ is not dangerous, the analog adjustment circuit 48 includes the adjustment circuit 56 and the dividers 49, 5〇. Details of the regulation circuit % or overall analog tuning circuit 48 are shown in FIG. The analog adjustment loop 48 is preferably supplied by a power supply circuit U having an unregulated voltage of about 1 〇 (M2 〇 v. The DC/DC converter may have the above-described 100303-1000714.doc • 21 or described in the figure The same type of 1 and 2. The resistance resistors in the 5 and 6 series microphones are used to output the light from the audio amplifier 1〇 to the microphone: supply. The resistors 5 and 6 are the same in size and remain the same. Symmetry of Line (1) The invention is of course not limited to emulating a power supply condenser microphone. The energy supply for the individual power receivers of the condenser microphone can also be performed, for example, by a battery located in: the wind. Providing the desired value or more precisely, the correction value of the polarization voltage is compared with the actual value via the operational amplifier 52. The calibration data measured by the user during the microphone manufacturing process is calculated and programmed into the electronic control. As a reference for this calculated value, use the precise reference electromigration 45 on the conductor or use the reference voltage programmed into the electronic controller during the printing measurement. The reference voltage 45 can be, for example, provided by logic The logic supply μ, which is preferably fed by the DC/DC converter n, is not shown in Fig. 7, but is shown in Fig. 1 and Fig. 2. As shown in Fig. 7, the analogy adjustment loop is suppressed. A preferred embodiment provides a low pass filter 51 between the D/A converter or the input of the analog tuning loop 48. The true value produced by the analogy regulating loop 48 is a circumstance of high frequency interference. The inverting input is obtained by voltage dividers 49, 5 且 and applied to operational amplifier 52 via impedance converter 53. The feedback line plus impedance converter is not included in the schematic illustration of Figure 6. At the same time, this voltage is also The input to the A/D converter 44 of the digital adjustment loop 47 is applied. The resulting digital signal is available as feedback to the electronic controller 39. As a result, the digital adjustment loop 47 is turned off. In the figure, the voltage divider is The 5 电阻 of the resistor indicates that the voltage divider takes the true value by I00303-I0007I4.doc • 22· 1358954. As disclosed in Fig. 7, the A/D converter 44, the electronic controller 39, and the D/A converter The device 46 can also be integrated into a single component. As an output of the analog adjustment 48, acquisition The adjusted polarization voltage applied to the microphone diaphragm 9 by the high ohmic resistor 8. The correction factor or the corresponding correction factor required to calculate the adjusted or anti-interference voltage may correspond to different settings, which reflect certain sensitivities, Guidance features and aging parameters; they can be stored in the memory provided in the electronic controller 39 and can be called at any time. These correction factors can be later controlled by the remote control of the microphone (for example, in the service department or by At the dealership, and possibly by the user), in addition to the possibility of microphone characteristics caused by aging or replacement of the microphone diaphragm, the on-site special custom adjustment of the microphone is also possible. The invention is not limited to the examples of individual embodiments. Naturally, it is also conceivable to use a microphone that combines all or at least some of the above circuits. For example, the remote control for all remotely controllable components can be provided in the microphone; also, in the microphone, the power supply circuit 11 can supply all conceivable power receivers. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a condenser microphone having a power supply circuit according to the present invention, and FIG. 2 is a block diagram showing an embodiment of a condenser microphone having a power supply circuit according to the present invention. 3 shows a circuit diagram of a transistor LED constant power source that is not based on the technical level of the patent application at the time, 00303-1 〇〇〇 714. Also -23- Figure 4 shows the circuit diagram of the constant power source of the receiving transistor according to the patent application. Figure 1 shows a block diagram of a condenser microphone connected to a remote control unit, and Figure 6 shows a block diagram of a condenser microphone with an integrated circuit for adjusting the bias voltage, and Figure 7 shows the use. The circuit for adjusting the polarization voltage includes an analog adjustment loop and a digital adjustment loop. [Main component symbol description] 1, 2, 3 wire 4 plug 5, 6, 8 resistor 7 capacitor 9 microphone diaphragm 10 audio amplifier 11 power supply circuit, DC/DC converter 12 control unit 13 constant current generator, power supply 14 Transformer 15 ' 16 ' 17 Supply loop, current loop 18, 19, 20 Diode 21 ' 22 ' 23 Capacitor 24 Logic supply 25 LED display 27 Zener diode 100303-1000714.doc • 24- 1358954 28, 29 Transistor 30 Current Generator 31 Simulation Supply Unit, Simulation Power Supply Unit, Simulation Power Supply Unit 32, 33 Feed Resistance 34 Parameter Control Input 35 Microcontroller 36 Frequency Modulator

37 filter

38 39 41 42 43 44 45 46 47 48 49 ' 50 51 52 53 54 Comparator electronic controller low pass chopper input differential amplifier capacitor A/D converter reference voltage D/A converter digital adjustment loop analog adjustment loop Voltage regulator low-pass waver operation amplifier impedance converter microphone 100303-1000714.doc -25- 1358954 55 56 Remote control unit adjustment battery 100303-1000714.doc 26

Claims (1)

1358954 lH is replacing the patent application No. _〇9351, the Chinese patent application scope replacement (100 years October) X. Patent application scope: I A method for remote control of a microphone, the microphone comprising at least one microphone a membrane (9), and at least one additional power receiver selected from the group consisting of an audio amplifier (10), a power supply circuit (11), a processor, an electronic controller (39), an A/D, and a D/A converter (44) , 46), a group of LED displays (25), and the like, and the energy supply thereof is transmitted through a cable conductor (1, 2) of the audio cable by a simulated power supply unit (3丨), a so-called simulated power supply, the method The method is characterized in that a frequency modulation voltage is applied as a control signal to at least one of the two electron mirror conductors 2, 2), and the simulated power supply is also transmitted by the same, and is characterized in that the frequency is on the microphone side. The modulation voltage is applied to an electronic controller (39), such as a microcontroller or a cpLD, which transmits a command according to the frequency modulation control signals to an individual power supply receiver, such as the method of claim 1, wherein use The control signal of a carrier frequency of about 100 kHz. Such as. The method of any one of items 1 to 2, wherein the audio signal is transmitted by the electron mirror conductor (1), and the frequency modulation voltage is fed to the electrical relay conductor (2). 4. A method according to any one of claims 1 to 2, wherein the frequency modulation voltage is applied as a common mode signal to the two electron mirror conductors at the same level (1, 2) The method of claim 4, wherein the frequency modulation voltage is isolated from the audio signal by an input differential amplifier (42). 6. In the case of any one of items 1 to 2, the eighth is modulated by a low-pass chopper 100303-1001006.doc 1358954 [^丨(f.1 correction (41) The audio signal is isolated. 7. The method of any one of the claims! to 2, in response to a control signal from the remote control unit (55) to the microphone (54), sending a data confirmation message to the remote control unit 8. The method of claim 7, wherein the data confirmation message is also a frequency modulation signal. 100303-1001006.doc 2-