EP2572517B1 - Unverselle fernsteuerung für ein drahtmikrofon - Google Patents

Unverselle fernsteuerung für ein drahtmikrofon Download PDF

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Publication number
EP2572517B1
EP2572517B1 EP11727205.4A EP11727205A EP2572517B1 EP 2572517 B1 EP2572517 B1 EP 2572517B1 EP 11727205 A EP11727205 A EP 11727205A EP 2572517 B1 EP2572517 B1 EP 2572517B1
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Prior art keywords
sound signal
transmission
digital
remote control
data
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EP11727205.4A
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English (en)
French (fr)
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EP2572517A1 (de
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Emmanuel Perille
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2410/00—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band processing

Definitions

  • a universal wired microphone remote control device for using the wired link of the microphone to transmit both the data of the remote control and the sound signal of the microphone, and to allow the use of the microphone without the remote control transmitting at least in this case the sound signal analogically on the wired link to remain compatible with any existing sound equipment.
  • the patent application CN201167402 describes a microphone with a remote control function.
  • the microphone and its remote control are here specifically related to one another to form one and the same particular material. Unlike the invention, this is not a universal remote control for any type of wired microphone.
  • the patent application is also known DE 102005042047 which describes a microphone made to be held in the hand and integrating a remote control to communicate with a computer to control for example the PowerPoint TM viewer.
  • JP-2005287050 describing a microphone remote control to which phantom power is applied by varying the bias voltage of the acoustic microphone cell according to the remote control.
  • JP-7212886 which describes a microphone incorporating a remote control for karaoke.
  • the patent application is also known CN-2264455 which describes a wireless microphone incorporating a remote control keyboard, the audio signal and the remote control information being transmitted by frequency multiplexing all modulated in FM by a single carrier wave.
  • the object of the present invention is to use the wired link of a wired microphone to be able to remotely control a hardware or software application connected to a sound equipment by means of a keyboard inserted in the connection rather than in the body of the wired microphone.
  • Another object of the invention is to be able to use only the wired microphone without the remote control function without having to worry about the difference of the equipment to which the analog audio signal microphone is connected.
  • Yet another object of the invention is to preserve the bandwidth performance of the transmission chain of the microphone sound signal.
  • Another object of the invention is to visualize the connection and the proper functioning of this remote control.
  • Yet another object of the invention is to avoid the acoustic propagation mechanical noise of key presses on the remote control keyboard towards the microphone membrane.
  • the receiving device includes a power supply unit with means for transmitting an electrical source via said wired link to said transmission device in order to supply the latter with energy.
  • the reception device includes means for detecting the presence of said transmission device inserted on said wired link.
  • the reception device includes means for displaying the presence of said transmission device inserted on said wired link.
  • the receiving device includes a charge impedance switching unit of said wired link controlled according to the detection of the presence of said transmitting device inserted on said wired link.
  • the reception device includes an amplification unit of said sound signal with controlled adjustable gain according to the detection of the presence of said transmission device inserted on said wired link.
  • said sound signal is transmitted in differential mode with said serialized data transmitted in common mode on said wired connection when it consists of at least three electrical conductors.
  • the transmission device includes a modulator of said serialized data before simultaneously transmitting them with said sound signal, and the receiving device includes a demodulator for reproducing said serialized data preceding a decoding unit.
  • the receiving device includes means for sampling and quantizing said analog sound signal from said duplexer to convert it into a digital sound signal, and a digital communication bus interface for retransmission. said data of the remote control with said digital sound signal.
  • the transmission device includes means for sampling and quantizing said analog sound signal of said microphone to convert it into a digital sound signal, and an encoding unit for serializing said sound signal. digital and transmit it simultaneously with said remote control data in a digital transmission signal, and the reception device includes means for decoding said digital transmission signal from said duplexer and extracting the digital sound signal and dissociating said data from the remote control.
  • the receiving device includes means for converting back to analog form said digital sound signal.
  • the receiving device includes a digital communication bus interface for retransmitting said data from the remote control.
  • said duplexer of the reception device restores the analog phonic signal by a commutation of the wired link in order to separate it from the transmission signal. digital, said switching being controlled according to the detection of the presence of said transmitting device inserted on said wire link.
  • the receiving device includes means for transmitting a synchronization clock signal in common mode over the wire link, and in that the transmitting device includes a means of extracting the clock signal, and means for controlling, as a function of the clock signal, the bit rate of the digital transmission signal transmitted in differential mode on the wired link when it consists of at least three electrical conductors.
  • the receiving device includes means for sampling and quantizing said analog sound signal from said duplexer to convert it into a digital sound signal, a means for selecting the digital sound signal and an interface digital communication bus for retransmitting said remote control data with said selected digital voice signal.
  • the reception device includes means for setting the audio parameters of the sound signal from the transmission device.
  • the transmission device includes a rotary displacement slider.
  • the transmission device includes a touch-sensitive sensor.
  • the transmission device includes a cryptographic method of the remote control data, the reception device a method of decrypting said data.
  • the transmission device is equipped with a means for carrying it on oneself.
  • the device according to the invention is particularly useful for remote control from a stage of a show, a oratory or an amphitheater of audio-visual equipment or stage equipment through the existing sound equipment, in this case via the wired connection of the stage microphone.
  • the device according to the invention also offers freedom for the user, artist or speaker, only on stage to pilot himself via a device compatible to any sound equipment a software or hardware application of his choice without having to systematically require the assistance of a sound engineer, or a Disc Jockey for a single rapper on stage for example.
  • stage performers' autonomy for live performance including karaoke
  • stage performer's independence of sound equipment has led some manufacturers to design microphone-related remote controls. .
  • the transmission device connected to a wired microphone 2 comprises a remote control keyboard 3 with its management and encoding unit 4 which reads the data of the remote control 5 to code them and transmit them in series 7, a means for superimposing these serialized data 7 with the analog acoustic signal 8 of the microphone 2, and a means of transmitting the result 9 on the wired link 1.
  • the reception device comprises a duplexer 10 connected to the wire link 1 to separate the reception of the analog audio signal 8 from the serial data transmission 7, a decoding unit 11 of the data of the remote control 5, and a means of restitution 12 of these same data.
  • the remote control keypad 3 of the transmitting device can also be completed with a rotary displacement cursor, for example an incremental encoder, which transposes any action of manual rotation of the cursor into angular relative displacement information in the form of two logic signals. binary translating a number of increments with the direction of rotation, binary signals that said management and encoding unit 4 can transmit in series 7 and that said decoding unit 11 of the receiving device can interpret into commands parameter settings which , for an application such as a sound reinforcement software, could correspond to mixing levels, tones or gains.
  • a rotary displacement cursor for example an incremental encoder
  • the transmitting device may include a touch-sensitive sensor in addition to said keyboard 3.
  • said management and encoding unit 4 may integrate a touch-sensitive sensor controller, such as for example the integrated circuit AT42QT4120 manufactured by ATMEL which translates the electrical signals of a capacitive touch-sensitive surface into information of events and two-dimensional positioning of the bearing zone on said sensor.
  • a touch-sensitive sensor controller such as for example the integrated circuit AT42QT4120 manufactured by ATMEL which translates the electrical signals of a capacitive touch-sensitive surface into information of events and two-dimensional positioning of the bearing zone on said sensor.
  • said management and encoding unit 4 will have to be connected to it via a serial communication bus interface type I2C or "Inter Integrated Circuit" configured in master mode, said information transmitted by the device of emission and then decoded by said decoding unit 11 of the receiving device can serve a purpose similar to that previously described in the case of the rotary displacement slider.
  • the means 6 may be a simple adder for summing the two signals provided that the frequency spectrum of the serialized data 7 emits no frequency in the 0-20 kHz band of the sound signal 8, otherwise the sound on reception would be parasitized by the transmission of data, and the data itself tainted with transmission errors.
  • the means 6 may also be a transmission duplexer, that is to say a summator which dissociates the two frequency bands to be superposed, comprising upstream a low-pass filter on the analog acoustic signal side and a high-pass or pass filter. a band centered on the carrier frequency of the serialized data 7 transposition, the whole being then added.
  • a transmission duplexer that is to say a summator which dissociates the two frequency bands to be superposed, comprising upstream a low-pass filter on the analog acoustic signal side and a high-pass or pass filter. a band centered on the carrier frequency of the serialized data 7 transposition, the whole being then added.
  • the transmitting device can integrate a small low-noise audio signal amplifier to increase the low level of the microphone 2 and reach a signal level Analogue sound 8 sufficient for the transmission on the wired link 1. It may also be envisaged to provide this amplifier with a means of biasing the microphone 2 with a so-called phantom continuous supply voltage in order to be able to use different types of microphones such as the electrets requiring a bias current for their acoustic cell.
  • programmable logic circuits of the PLD type for example.
  • FPGA Field Programmable Gate Array
  • programmable microcontrollers such as DSP (Digital Signal Processor) or PIC ® microcontroller.
  • the management and encoding unit 4 transmits and encodes the data read 5 from the remote control 3 into a serial frame 7.
  • This unit 4 can be designed so that it transmits said frame only when a state change occurs. data 5 of the keyboard 3 or systematically synchronously, that is to say with a clock information continuously transmitted and superimposed on the data 5 for decoding on reception.
  • a Manchester type Bi-phase code may be perfectly suitable with a frame start header, followed by a corresponding binary data sequence when reading each key of the keyboard, and concluded with parity information. of transmission to reinforce the validity of the reception of the data 5 on the wired link 1.
  • a first embodiment of the means for superimposing the serialized data 7 with the sound signal 8 can be performed, when it is decided to keep said sound signal 8 in its original analog form, by frequency multiplexing as described in relation to the figure 2 .
  • a modulator 19 performs a frequency translation of the frame signal 7 upstream of a duplexer of frequencies 6 which superimposes the thus modulated signal 29 with the analog acoustic signal 8 of the microphone 2.
  • the transmission means 9 on the wired link 1 is in fact constituted of two amplifiers placed just before the duplexer 6, one of type BF, or low frequencies, analog sound signal side 8, the other type HF or high frequency modulated signal side 29.
  • a minimum value of transposition frequency, or carrier frequency will be chosen such that the modulation spectrum does not impinge on the desired bandwidth of the transmission chain of the microphone sound signal. All this in order to guarantee, on the one hand, performances of audio bandwidths sometimes higher than those of certain microphones but corresponding to sampling frequencies of 96 kHz or 192 kHz commonly used in certain professional digital audio equipment, and on the other hand, with less modulation spectrum width limit constraints the possibility of significantly increasing the serialized data transmission rate 7 if necessary.
  • the modulation may be of FSK type, "Frequency Shift Keying” or also frequency hopping modulation, generally performed by a phase locked loop commonly called PLL (Phase Locked Loop) to which the loop filter can be adjusted so as to to reduce the spectral bulk of the modulation sidebands sufficiently to avoid, as far as possible, any interference on the wired link 1 with the analog phonic signal 8.
  • PLL Phase Locked Loop
  • a bi-phase coding for the frame 7 facilitates modulation and demodulation synchronous data.
  • the reception device includes a frequency duplexer 10 which of the wired link 1 renders on one side the analog phonic signal 8 and on the other the serialized data 7.
  • the frequency multiplexing it is first the modulated signal 30 that the duplexer 10 provides before a demodulator 20 restores the serialized data 7.
  • a decoding unit 11 receives the serialized data 7 and can check the coherences of transmissions such as clock, header and frame parity information 7 before extracting and decoding the data received for their data. restitution 12.
  • the reproduction 12 of the information or data of the remote control can be carried out, for example, in a parallel form, that is with each binary data item corresponding to the state of each of the keys.
  • the keyboard 3 an electrical interface of optoelectronic coupler type that offers the advantage of a simple operation of "all or nothing" and universal type with galvanic isolation of remote-controlled signals.
  • Another embodiment of said rendering 12 of the data 5 of the remote control 3 is to transmit them in serial form by a digital communication bus interface.
  • the wired link 1 consists of at least three electrical conductors, as is very generally the case for audio equipment of show scenes whose connections are XLR connectors with three pins, it will be preferable to transmit in differential mode between two hot spots of the wired link 1 the analog phonic signal 8, and in common mode at the ground potential the modulated signal 29, this in order to keep the compatibility of the electrical connection of the microphone 2 without the insertion of the transmitting device, c ' that is to say without remote control, and to ensure the least annoying crosstalk possible between the two transmitted signals.
  • the low frequency amplifier, or BF, of the transmission means 9 preceding the duplexer 6 may consist of two symmetrical outputs in phase opposition, with the reception duplexer 10 followed for example by a differential amplifier for reconvert the analog phonic signal 8 in common mode, the two duplexers 6 and 10 being similar with as access a differential mode for the audio signal 8 and a common mode for the modulated signal 29.
  • duplexer 10 is not an adder unlike the duplexer 6.
  • the duplexer 10 comprises, for a frequency multiplex transmission, only the low-pass and high-pass / bandpass filters to separately restore the phonic signal.
  • An electric power supply and transmission unit 13 supplies a sufficient supply current to the transmitting device, which current can be distributed identically over the two hot-spot wires of the wire link 1 when the latter is of the type XLR 3-pin, as is very generally the case.
  • a load impedance switching unit 16 of the wire link 1 makes it possible to reduce the load impedance at low frequencies so as to transmit to the transmission device inserted on the wire link 1 its supply current without having to use a phantom power supply voltage that is too high online that would create security and compatibility issues with existing microphones.
  • the low line impedance at the low frequencies of the receiving device justifies the use of the amplifier BF of the transmission means 9 previously mentioned, otherwise the sound signal 8 of the microphone 2 could not be transmitted as is without a significant loss of transmission level knowing that a microphone has a characteristic impedance several hundred to a thousand ohms.
  • This relative high impedance of a microphone therefore justifies that the load impedance switching unit 16 can switch back to a higher impedance of the order of one kilo ohm when the microphone 2 is connected directly to the wired link. 1 in the absence of insertion of the transmitting device.
  • the transmission of the electrical source 13 and the load impedance switching unit 16 may be performed with a switching transistor of the supply current, type Darlington transistor for example.
  • This transistor short-circuits a resistance of one kilo Ohm connected between the power supply and another resistor, which is of low value and connected in series to the output of the reception duplexer 10 on the sound signal side 8.
  • a voltage comparator performs the presence detection 14 of the remote control inserted on the wired link 1 by measuring the average (or half-sum) of the two DC potentials present on the two hot-spot wires, eliminating thus in this measurement the influence of the phonic signal 8 in phase opposition between these two points, and by comparing this average with a reference voltage proportional to the supply voltage for the electrical source 13. or the absence of the remote control on the wired link 1 by measuring a current of supply current flowing in said series resistors of low values.
  • the output 17 of this comparator can then drive the bases of the two Darlington transistors and drive a mini electromechanical relay that switches the adjustable gain resistance of the differential amplifier 18.
  • a connection capacitor can provide the differential amplifier with potential isolation. power supply present at the output of the duplexer 10 to restore the phonic signal 8.
  • a voltage comparator a double threshold voltage device with hysteresis, this on the one hand so as not to make false detection of the presence of any other device connected to the wired link.
  • a phantom power current limited to a few milliamperes such as active direct boxes for 48 volt phantom power, and secondly to prevent any oscillation of the comparator output 17 at start up of the transmitting device.
  • the comparator when at the beginning the comparator does not detect any supply current flowing in the wired link, it will ensure that it operates with a first detection such that it is only sensitive to a current intensity significant to easily separate the transmitting device from a simple direct active box connected to the wired link. Once the transmission device has been detected, the comparator must then immediately change the detection threshold so that it returns to its initial state only when it detects only a current intensity that is insufficient to power the transmission device. In this way, any detection instabilities at start-up are likewise avoided.
  • the receiving device 10, 11, 12 includes means for displaying the presence of said transmitting device 3, 4, 6, 9 inserted on said wire link.
  • This means 15 must indicate the proper operation of the data transmission in addition to the presence detection state.
  • the decoding unit 11 provides this result because it analyzes the coherence of various information extracted from the decoded data 5 as well as a good reception of the clock and the headers of the transmitted frames in the case of a synchronous detection.
  • Continually active visualization is synonymous with the proper operation of equipment and connections.
  • this same output 17 of the comparator can be used to visualize the detection of the transmission device, unless it is decided otherwise, that this detection information of the remote control is rather provided by the decoding unit 11. even from the good reception of the serialized data 7, that is to say more precisely the data 5 of the remote control correctly decoded by the decoding unit 11 according to the validation of the reception frames (clock and headers well detected and parity of transmission correctly received), this in order to reassure on the good overall operation of the remote control.
  • an analog-digital converter 21 samples and quantizes the analog phonic signal 8 coming from the gain-gain amplifier unit 18 previously mentioned, the converter 21 being of course and normally preceded by anti-aliasing or anti-aliasing filters. anti-aliasing of the analog signal.
  • These filters are analog low-pass filters found in digitizing devices to clean the signal before performing analog-to-digital conversion.
  • the anti-aliasing filter makes it possible to prohibit any presence, before sampling, of frequencies greater than Fe / 2, Fe being the sampling frequency. The theoretical explanation of the need for such filtering is given by Shannon's theorem.
  • the digital communication bus interface 23 receives on the one hand the digital sound signal 22 coming from said converter 21, and on the other hand the data 5 of the remote control 3 decoded by the decoding unit 11.
  • the communication bus will for example commonly be USB or Universal Serial Bus type, and there are several references of components that can satisfy this function, such as the reference circuit MAX3421E manufactured by the company MAXIM which integrates ports logical inputs / outputs to be able to read the data 5 of the remote control 3 as well as a Serial Peripheral Interface Bus (SPI) type interface for connecting said converter 21 which may be part of the digital analog audio converters equipped with an interface SPI compatible series.
  • SPI Serial Peripheral Interface Bus
  • the programmable micro controller necessary for the implementation of this USB interface circuit may be of the type of digital signal processing processor commonly called DSP or "Digital Signal Processor” suitable for taking the digital sound signal 22 from the converter 21 via for example a serial synchronous communications port type SSC or "Synchronous Serial Controller", and retransmitting it to the MAS3421E circuit via its SPI interface port, these two SSC and SPI communication ports being generally already present and integrated on most DSP programmable processor circuits.
  • DSP digital signal processing processor
  • SSC serial synchronous communications port
  • SPI Serial Controller
  • the programming of the DSP microcontroller will thus make it possible to configure the SPI port of the DSP in a master SPI interface to both control and manage the communication of the USB interface of the MAX3421E circuit, to read the data 5 of the remote control 3 accessible via the ports D logic inputs of the MAX3421E, and if necessary adjust some audio parameters of the converter 21, such as volumes, gains, sampling frequency or quantization of the digital sound signal 22.
  • USB interface of the circuit MAX3421E in peripheral mode or "device” with for example at least two separate software interfaces, that is to say two classes of USB communication: an audio class to transmit the device. digital sound signal 22 and a class called HID or "Human Interface Device” to transmit the data 5 of the remote control 3.
  • USB transmission channels available to the MAX 3421E circuit, commonly called “pipe” or "end point” channels
  • Such a circuit can be, for example, the circuit AT91SAM7S256 manufactured by the company ATMEL which, although it is not of the DSP type, has SSC and SPI ports and sufficient processor resources (memory size and execution speed) to design in a similar embodiment the same audio and HID software interfaces mentioned above.
  • the same digital communication bus interface 23 may be shared by several different reception devices.
  • the set of data 5 of each remote control 3 can be collected on the same logic input port with the implementation of logic selection circuits.
  • the data may thus be multiplexed on the logic input port of the MAX3421E circuit and selected for each remote control 3 from control signals that may be provided by the logic output port of the MAX3421E circuit.
  • USB data interface 5 of the remote control 3 for a class "Musical Instruments Digital Interface” (MIDI) rather than an HID class with a consumer mode (media).
  • MIDI Musical Instruments Digital Interface
  • the figure 5 represents another embodiment of the invention, said time-division multiplex transmission, which consists of transmitting on the wired link the data of the remote control with the sound signal of the microphone previously converted in the transmission device into a digital audio signal to emit an entirely digital transmission signal.
  • This signal is then dissociated by the receiving device into two distinct digital information, firstly the reconstructed remote control data and secondly the phonic signal restored in digital form or also converted back into its original analog form.
  • the transmission device first integrates an analog digital converter 21 for sampling and quantifying the sound signal 8 of the microphone 2 into a digital sound signal 22.
  • the converter can implicitly integrate its prior functions of anti-aliasing filtering. Audio signals, as already explained about the converter 21 when describing in relation to the figure 4 , with the sound signal 8 also being able to come from an amplifier of small low noise audio signals with a phantom power supply voltage for the microphone cell 2.
  • the encoding and serialization unit 24 of the data 5 of the remote control keypad 3 incorporates the same management unit and encoding function 4 of the keyboard previously described in connection with the figure 1 in addition to a means for serializing and transmitting said data 5 in a multiplexed manner with the digitized sound signal 22 in the same digital transmission signal 25 then submitted to the transmission means 9 on the wired link 1.
  • the digital transmission 25 can be performed in common mode with a single RF amplifier as a transmission means 9, without the transmission device having to simultaneously transmit the transmission. less analog tone signal in differential mode. This then simplifies this embodiment of the constitution of the transmission device due to the absence of the dual amplifier BF in phase opposition and the necessary transmission duplexer and already described in the case of frequency multiplexing.
  • the time-division multiplexer transmission device a certain minimum duplexer for simply recovering via a shock inductor, for example the in-line supply current on one side by isolating it from the transmitted RF signal from the other with a connection capacitor .
  • the SPDIF transmission is synchronous with a clock integrated in its Manchester Bi-Phase coding, it is sufficient to use this "bit U" time window of the SPDIF encoder to sample and transmit the serialized data 7 produced by the management unit and encoding 4 of the remote control data 5.
  • the management unit and encoding unit 4 with the SPDIF encoder thus constitutes the said encoding and serialization unit 24.
  • the figure 5 also represents the receiving device in its time-multiplexed version by first integrating, for the sake of compatibility, the same type of duplexer 10 as that suitable for the frequency multiplexing version described in relation to the Figures 1 and 2 , since it must always be possible to separate from the digital transmission signal 25 the analog phonic BF signal 8 of the microphone 2 when the latter is connected to the wired link 1 without the insertion of the remote control.
  • the embodiment of the receiving device can then be improved by integrating the other functions specific to the embodiment of the frequency division multiplexing version to allow compatibility of operation of the receiving device with any type of transmission device connected to the wired link 1.
  • a simple embodiment of said switching may be an electromechanical relay, given that most analog electronic switching integrated circuits do not generally guarantee a minimum level of thermal noise sufficient to not degrade the performance in signal to noise ratio.
  • this embodiment of the reception duplexer 10 by pure switching it is possible to connect on the wire link 1 via a "shock" self-inductance in series the same phantom power of the remote control as previously described with its various options corresponding to the figure 3 .
  • a digital audio decoder circuit of the same format as that of the transmission device will restore the digital sound signal 22 as well as, through the "U-bit" time window when it is SPDIF, the serialized data 7 subsequently submitted. to the decoding unit 11 for restoring the data of the remote control 5.
  • the decoding unit 4 and decoder SPDIF thus composes a decoding means of the digital transmission signal 26.
  • an analog converter 27 will be added to reconvert the digital tone signal 22 coming from the digital transmission 25 into an analog tone signal 8 when, for example, the receiving device is integrated in this time-division multiplex version in an analog device such as a showroom mixing console.
  • the receiving device is integrated in this time-division multiplex version in an analog device such as a showroom mixing console.
  • it will be sufficient to add the one from the analog converter 27 of the transmission. 25 with the one from the duplexer 10 when the remote control is not inserted into the microphone connection 2.
  • this embodiment of the receiving device when this embodiment of the receiving device is integrated for example in a sound card external to a computer, it may be preferable to add a digital communication bus interface 23, type USB FireWire or other, to retransmit to a computer, an MP3 player or a mobile phone, a digital sound signal 22 associated with the data of the remote control 5, as described in the case of the frequency division multiplexing version according to the figure 4 .
  • an analog digital converter 21 transforms the analog sound signal 8 coming from the duplexer 10 into a digital sound signal 22 which will then be switched by the selection means 28 with the digital sound signal 22 from the digital transmission 25.
  • the same digital communication bus interface 23 can be connected and shared between several receiving devices 10, 26, 21, 28.
  • the embodiment of the receiving device shown in FIG. figure 5 in its time-multiplexed version can be further improved by integrating the functions specific to the embodiment of the frequency-division multiplexing version in order to allow the said reception device to decode both types of transmission of the wired link which come from to be described. It suffices to equip the device with receiving both the demodulator 29 according to the figure 2 and the SPDIF type digital audio decoder.
  • the decoding means of the digital transmission signal 26 all with a decoding unit 11 capable in both cases of authenticating the validity of the serialized data 7 according to the criteria mentioned above in relation to the Figures 1 and 2 relating to coherences of transmissions such as clock, header and frame parity information 7 before extracting and decoding the received data for their return 12.
  • the figure 6 represents an alternative embodiment of the invention in its time division multiplexing version of digital audio transmission differential mode of the sound signal, wherein the receiving device transmits in common mode on the wired link a synchronization clock signal that the device of transmission can extract to control the rate of said digital audio transmission, thus avoiding that the phonic signal digitized by the transmission device then requires the implementation of a sampling frequency change method at its return by the reception device when it is desired to synchronize the digital audio transmission rate with that of, for example, an external digital communication bus, or to synchronize several transmission devices on the same sampling frequency of the sound signals.
  • the reception device represented here integrates the two time and frequency multiplexings to work with the two possible types of transmission devices.
  • a differential digital audio transmission 25 with a common transmission of said synchronization clock signal 31 back on a wired link 1 consisting of at least three conductors an embodiment designed for the classical case of a wired connection of three conductors, where it will also transmit in differential mode the analog phonic signal 8 of the microphone 2 connected without insertion of the remote control, and in common mode the modulated signal 30 of a frequency multiplex transmission device.
  • the decoding means 26 of the digital transmission signal 25 generates from a synchronization setpoint information 35 a synchronization clock signal 31 to the reception duplexer 10.
  • the embodiment of the duplexer 10 is based on around the model for frequency multiplexing with a double differential output, one low-pass filter side BF reproducing the analog sound signal 8, the other high-pass filter side HF returning the modulated signal 30 in common mode via an adder bridge of two resistors of the same value.
  • the demodulator 20 receives said modulated signal 30 to restore the serialized data 7 when a transmission device to An analog tone signal, either frequency-division multiplexed, is connected to the wired link 1.
  • the decoding means 26 integrates the decoding unit 11 to extract from said serialized data 7 the data 5 of the remote control and to produce a display information 36 attesting to the good reception and good decoding of the modulated signal 30.
  • the reception duplexer 10 integrates a differential amplifier with a video bandwidth of a few megahertz, which provides in common mode by decoding means 26 the digital transmission signal 25.
  • the synchronization clock signal 31 on the wire link 1 by means of a balanced resistive splitter connected on either side of the differential output HF of the duplexer 10, the midpoint of said splitter being the point of contact. injecting said signal.
  • the value of the two resistors said splitter to that of the characteristic impedance HF of the wired link 1.
  • two electromechanical relays with coupled double switch may form an integral part of the reception duplexer 10, one inserted on the output side BF to silence the analog phonic signal 8 when the digital transmission signal 25 is relayed from the receiver.
  • the decoding unit 11, 26 can permanently monitor the absence or the presence on the wired link 1 of said modulated signal 30. And, depending on a information for detecting the presence 17 of a transmission device on the wired link 1, the decoding unit may activate said command 37 in the event of the presence information 17 detected and the absence of modulated signal reception 30, here by deduction the default case of a digital audio transmission device.
  • the transmission on the wired link 1 of the synchronization clock signal 31 can then be started, a signal which, devoid of any modulating signal, can not be interpreted by the demodulator 20 in the wrong manner as being a modulated signal 30.
  • the so-called time-multiplexed digital audio transmission device includes a synchronization duplexer 32 for transmitting the digital transmission signal 25 in differential mode, extracting from the wired link 1 the received synchronization signal 33, and if necessary also extract the phantom power currents supplied by the receiving device.
  • the transmitting means 9 can be realized with an amplifier of a video-type bandwidth and provided with two symmetrical outputs in phase opposition with low impedance, each of said outputs being connected to the wired link via a link resistor. a value which can correspond to that of the characteristic impedance HF of the wired link 1.
  • a balanced resistive adder bridge on the wired link makes it possible to extract in common mode said received synchronization signal 33 before applying it to the coding and serialization unit 24.
  • the encoding unit preferably integrates a circuit PLL phase lock loop for reconstituting from said received synchronization signal 33 a stabilized clock signal 34.
  • the sampling and quantizing means 21 producing the digital tone signal 22 may receive this signal 33.
  • the frequency of said stabilized clock signal 34 may correspond to a multiple of the sampling frequency of the analog sound signal 8, and to a multiple of the bit rate of the digital transmission signal
  • the ratio between said bit rate and said sample rate corresponds to the number of bits of digital audio frames transmitted per audio sample, ie, for example 32 bits per monophonic sample for SPDIF type digital audio transmission.
  • said synchronization setpoint information 35 may be, for example and non-exhaustively, either an internal clock signal or an external clock signal of the type commonly referred to as "World Clock". with its 75-ohm BNC connector, or either synchronization signals from a digital communication bus interface such as a programmable microcontroller circuit incorporating a USB interface configured as an audio-class device with a control protocol the flows of the exchanges digital audio data on said USB bus.
  • a digital communication bus interface such as a programmable microcontroller circuit incorporating a USB interface configured as an audio-class device with a control protocol the flows of the exchanges digital audio data on said USB bus.
  • the invention is a universal remote control that can be dedicated to any application, it is conceivable that part of the operation of said remote control is particularly dedicated to adjusting the audio parameters of the sound signal 8.
  • the receiving device includes a sound signal processing means 8 to be able for example to change the gain, tone or volume, and includes a control interface of said processing, which interface, integrated with the decoding unit 11, to control said parameters audio of the sound signal 8 according to a particular decoding of said data 5 of the remote control 3 of said transmitting device.
  • said control interface can interpret the keypad of the remote control 3 into adjustment commands after, for example, having been able to decode a first sequence of several keys pressed simultaneously to activate the "adjustment" mode before a second sequence allows the decoding unit 11 to leave the same mode.
  • an integrated circuit capable of producing said processing means may be the TDA7439 circuit manufactured by the company ST Microelectronics, which has means for adjusting the gain, the volume, the low mid and high tone as well as the selection of the signal. sound with a multiplexing circuit with four analog inputs. In the case of frequency multiplexing, it is possible to directly insert said sound signal processing means 8 at the audio output of said reception duplexer 10, and more precisely just at the output of the adjustable gain differential amplifier 18.
  • said control interface integrated in the decoding unit 11 will be a master type I2C interface.
  • the device Preferably, if it is desired to be able to customize the device according to the invention by restricting the compatibility of all the possible connections of the same set of transmission devices to another set of reception devices, it will be possible to include in each device transmission of the same cryptographic process of the data of the remote control 5 which will then be decrypted by the same decryption method included in each receiving device of the same set.
  • the management and encoding unit of the keyboard 4 may integrate said cryptographic method for scrambling the data of the remote control 5 with for example keys randomly generated and themselves scrambled, the set (keys + data) can then be encoded in said serialized data 7.
  • the decoding unit 11 can integrate a decryption method of said transmitted keys in said serialized data 7. Once decrypted, said keys can then be used to the same decryption method to decrypt said data of the remote control 5 to from said serialized data 7 transmitted.
  • the transmission device when using the device according to the invention on a show stage, it is preferable to equip the transmission device with a means of carrying it on oneself, for example by shoulder strap or well equipped Velcro TM or Velcro strips to attach to a hand-held body at arm's length for easy and effortless access to the remote control keypad 3 with the free hand that does not hold the microphone.
  • a means of carrying it on oneself for example by shoulder strap or well equipped Velcro TM or Velcro strips to attach to a hand-held body at arm's length for easy and effortless access to the remote control keypad 3 with the free hand that does not hold the microphone.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)

Claims (20)

  1. Universelle Fernsteuerungsvorrichtung für ein drahtgebundenes Mikrofon (2) bestehend aus einer Ausgangs-Drahtverbindung (1), welche es ermöglicht, die Drahtverbindung des Mikrofons (2) zu verwenden, um zugleich die Daten der Fernsteuerung mit dem Tonsignal des Mikrofons zu übertragen, und um die Verwendung des Mikrofons (2) ohne die Fernsteuerung zu ermöglichen, indem in diesem Fall mindestens das Tonsignal analog über die Drahtverbindung (1) übertragen wird, dadurch gekennzeichnet, dass sie folgende in die Drahtverbindung integrierten Vorrichtungen umfasst:
    - eine Sendevorrichtung (3, 4, 6, 9), die an das Mikrofon (2) angeschlossen werden kann und eine Fernsteuerungstastatur (3) enthält, und die eine Einheit (4) zur Verwaltung und Codierung der Tastatur (3) umfasst, um die Daten der Fernsteuerung zu analysieren und zu serialisieren, ein Mittel zur gleichzeitigen Übertragung (6) der serialisierten Daten mit einem Tonsignal (8) des Mikrofons (2) und ein Mittel zum Senden (9) des Ergebnisses über die Kabelverbindung; und
    - eine Empfangsvorrichtung (10, 11, 12), die einen Duplexer (10) umfasst, um das analoge Tonsignal (8) wiederzugeben und es von den serialisierten Daten zu trennen, eine Einheit zur Decodierung (11) der Daten und mindestens ein Mittel (12) zur Wiedergabe der decodierten Daten.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) eine Versorgungseinheit (13) mit einem Mittel zur Übertragung einer elektrischen Quelle über die Drahtverbindung (1) an die Sendevorrichtung (3, 4, 6, 9) umfasst, um letztere mit Energie zu versorgen.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) ein Mittel zur Erkennung (14) der Präsenz der in die Drahtverbindung (1) integrierten Sendevorrichtung (3, 4, 6, 9) umfasst.
  4. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) ein Mittel zur Anzeige (15) der Präsenz der in die Drahtverbindung (1) integrierten Sendevorrichtung (3, 4, 6, 9) umfasst.
  5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) eine Schaltungseinheit (16) für die Lastimpedanz der Drahtverbindung (1) umfasst, die gemäß der Erkennung der Präsenz der in die Drahtverbindung (1) integrierten Sendvorrichtung (3, 4, 6, 9) kontrolliert wird.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) eine Einheit zur Verstärkung des Tonsignals (8) mit einem einstellbaren Verstärkungsfaktor umfasst, der gemäß der Erkennung der Präsenz der in die Drahtverbindung (1) integrierten Sendevorrichtung (3, 4, 6, 9) kontrolliert wird.
  7. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Tonsignal (8) im Differentialmodus mit den im Gleichtaktmodus übertragenen serialisierten Daten an die Drahtverbindung (1) übertragen wird, wenn diese aus mindestens drei elektrischen Leitern besteht.
  8. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Sendevorrichtung (3, 4, 6, 9) einen Modulator (19) der serialisierten Daten umfasst, bevor sie gleichzeitig mit dem Tonsignal übertragen werden, und dadurch, dass die Empfangsvorrichtung (10, 11, 12) einen einer Decodierungseinheit (11) vorhergehenden Demodulator (20) umfasst, um die serialisierten Daten wiederzugeben.
  9. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) ein Abtast- und Quantifizierungsmittel (21) für das vom Duplexer (10) stammende analoge Tonsignal (8) umfasst, um es in ein digitales Tonsignal (22) umzuwandeln, und eine Bus-Schnittstelle (23) für die digitale Kommunikation, welche die Weitersendung der Daten der Fernsteuerung mit dem digitalen Tonsignal (8) ermöglicht.
  10. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Sendevorrichtung (3, 4, 6, 9) ein Abtast- und Quantifizierungsmittel (21) für das analoge Tonsignal (8) des Mikrofons (1) umfasst, um es in ein digitales Tonsignal umzuwandeln, sowie eine Codierungseinheit (24), um das digitale Tonsignal zu serialisieren und gleichzeitig mit den Daten der Fernsteuerung als ein digitales Übertragungssignal (22) zu übertragen, und dadurch, dass die Empfangsvorrichtung (10, 11, 12) ein Mittel (26) umfasst, um das vom Duplexer (10) stammende digitalen Übertragungssignal zu decodieren, und um das digitale Tonsignal daraus zu extrahieren und die Daten der Fernsteuerung davon zu trennen.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) ein Mittel (27) umfasst, um das digitale Tonsignal wieder in die analoge Form umzuwandeln.
  12. Vorrichtung nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass der Duplexer (10) der Empfangsvorrichtung (10, 11, 12) das analoge Tonsignal (8) durch eine Umschaltung der Drahtverbindung (1) wiedergibt, um es vom digitalen Übertragungssignal (25) zu trennen, wobei die Umschaltung je nach Erkennung der Präsenz der in die Drahtverbindung (1) integrierten Sendevorrichtung (3, 4, 6, 9) kontrolliert wird.
  13. Vorrichtung nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) ein Mittel zum Senden eines Synchronisationstaktsignals im Gleichtaktmodus an die Drahtverbindung (1) umfasst, und dadurch, dass die Sendevorrichtung (3, 4, 6, 9) ein Mittel zum Extrahieren des Taktsignals umfasst und ein Mittel, um die Rate des digitalen Übertragungssignals (22), das im Differentialmodus über die Drahtverbindung (1) übertragen wird, je nach Taktsignal zu kontrollieren, wenn diese Drahtverbindung aus mindestens drei elektrischen Leitern bestehlt
  14. Vorrichtung nach einem der Ansprüche 1 bis 8 und 10 bis 13, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) eine Bus-Schnittstelle (23) für digitale Kommunikation umfasst, welche das Weitersenden der Daten der Fernsteuerung ermöglicht.
  15. Vorrichtung nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) ein Abtast- und Quantifizierungsmittel (21) für das vom Duplexer (10) stammende analogen Tonsignals (8) umfasst, um es in ein digitales Tonsignal (22) umzuwandeln, ein Mittel (28), um das digitale Tonsignal (22) auszuwählen, und eine Bus-Schnittstelle (23) für digitale Kommunikation, welche das Weitersenden der Daten der Fernsteuerung mit dem ausgewählten digitalen Tonsignal (22) ermöglicht.
  16. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Empfangsvorrichtung (10, 11, 12) ein Mittel umfasst, um die Audioparameter des Tonsignals (8) von der Sendevorrichtung (3, 4, 6, 9) aus einzustellen.
  17. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Sendevorrichtung (3, 4, 6, 9) einen Cursor mit drehender Bewegung umfasst.
  18. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Sendevorrichtung (3, 4, 6, 9) einen Sensor mit berührungsempfindlicher Oberfläche umfasst.
  19. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Sendevorrichtung (3, 4, 6, 9) ein Verfahren zur Verschlüsselung der Daten der Fernsteuerung 5 umfasst, und dadurch, dass die Empfangsvorrichtung (10, 11, 12) ein Verfahren zur Entschlüsselung der Daten umfasst.
  20. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Sendevorrichtung (3, 4, 6, 9) mit einem Mittel ausgestattet ist, um sie an sich selbst zu tragen.
EP11727205.4A 2010-05-19 2011-05-16 Unverselle fernsteuerung für ein drahtmikrofon Active EP2572517B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1002108A FR2960361B1 (fr) 2010-05-19 2010-05-19 Dispositif de telecommande universelle pour microphone filaire
PCT/FR2011/000296 WO2011144824A1 (fr) 2010-05-19 2011-05-16 Dispositif de telecommande universelle pour microphone filaire

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EP2572517A1 EP2572517A1 (de) 2013-03-27
EP2572517B1 true EP2572517B1 (de) 2014-04-23

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WO (1) WO2011144824A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10924847B2 (en) 2019-01-14 2021-02-16 Yamaha Guitar Group, Inc. Microphone that functions as either a digital wireless microphone or a wired passive microphone

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328578A (en) * 1979-12-31 1982-05-04 Motorola Inc. Digital receiver/transceiver synchronization pulse detector for a multiplexing system
JPH07212886A (ja) 1994-01-21 1995-08-11 Takemori Toyonaga リモコンマイク
CN2264455Y (zh) 1996-01-05 1997-10-08 黄帝文 单一载波的无线遥控麦克风装置
US5677669A (en) * 1996-08-13 1997-10-14 Applied Electro Mechanics, Inc. Audio illuminator
EP1585359B1 (de) 2004-03-30 2017-10-04 AKG Acoustics GmbH Fernsteuerung von phantomgespeisten Mikrofonen
DE102005042047A1 (de) 2004-09-03 2006-03-30 Sennheiser Electronic Gmbh & Co. Kg Mikrofon
US7584314B1 (en) * 2007-02-05 2009-09-01 National Semiconductor Corporation Universal serial-to-parallel and parallel-to-serial cable interface and method
CN201167402Y (zh) 2008-03-17 2008-12-17 夏旺军 一种具有遥控功能的麦克风

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FR2960361B1 (fr) 2012-06-29
EP2572517A1 (de) 2013-03-27
FR2960361A1 (fr) 2011-11-25
WO2011144824A1 (fr) 2011-11-24

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