CN102783070A - Communication system and communication method - Google Patents
Communication system and communication method Download PDFInfo
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- CN102783070A CN102783070A CN201180011892XA CN201180011892A CN102783070A CN 102783070 A CN102783070 A CN 102783070A CN 201180011892X A CN201180011892X A CN 201180011892XA CN 201180011892 A CN201180011892 A CN 201180011892A CN 102783070 A CN102783070 A CN 102783070A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/06—Transformation of speech into a non-audible representation, e.g. speech visualisation or speech processing for tactile aids
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
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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
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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
- H04R2410/00—Microphones
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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
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/07—Applications of wireless loudspeakers or wireless microphones
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing
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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
- H04R3/007—Protection circuits for transducers
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- Computer Networks & Wireless Communication (AREA)
- Audiology, Speech & Language Pathology (AREA)
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Abstract
Provided is a communication system that can have increased secrecy abilities and can reduce the audio level of leaked audio output from a reception device in a broadband system. The communication system (1) is configured from a wireless microphone (2) that is a transmission device, and a speaker device (3) that is a reception device. When a broadband audio signal is input into the wireless microphone (2), the wireless microphone (2) performs balanced modulation processing that reverses the high and low frequencies of the audio signal, and transmits an audio signal wherein, of the audio signal having reversed high and low frequencies, the signal of the band that is at or below a baseline frequency has been cut. When the speaker device (3) receives the audio signal transmitted from the wireless microphone, the speaker device (3) performs an inverse balanced modulation that re-reverses the high and low frequencies of the received audio signal, and outputs the audio signal having the re-reversed high and low frequencies.
Description
Technical field
The present invention relates to a kind of communication system of receiving and dispatching wide band voice signal, particularly relate to the technology that improves secret what is said or talked about property.
Background technology
In the past, in transceiver, home-use radio telephone etc., utilized transmitting-receiving only to comprise the voiceband (communication system of the voice signal of the narrow-band of 300Hz ~ 3kHz).In the communication system of this narrow-band; As cheaper technology with secret what is said or talked about property; Following method has been proposed: balanced modulator is set at transmitter and receiver both sides; Send the height counter-rotating make frequency and the voice signal that obtains in sender side, the height that makes the frequency of the voice signal that is received at receiver-side reverses and the method (for example japanese kokai publication hei 7-307721 communique) of restoring once more.
In this existing method, do not receive the voice signal that sends from transmitter even do not have other receivers of balanced modulator, because the height of the frequency of this voice signal is inverted, therefore be difficult to hear the content of sound.In the past, in the communication system of narrow-band, so guaranteed secret what is said or talked about property.
Yet existing communication system can only be received and dispatched and only comprised voiceband (voice signal of the narrow-band of 300Hz ~ 3kHz), therefore (the wide band situation of 100Hz ~ 15kHz) is compared, and has the low problem of tonequality with comprising sonic-frequency band.
Therefore, in order to improve tonequality, consider that employed method is directly applied for wide band communication system in the communication system with existing narrow-band.But, only depend on existing method be applicable to wide band communication system be can't obtain in the communication system of narrow-band the secret what is said or talked about property that can obtain.Promptly; In the voice signal of balance modulation back (frequency counter-rotating back); The electrical characteristics of the electronic unit of formation balanced modulator are owing to its deviation made or variations in temperature etc. depart from desirable symmetry, and original sound (voice signal before the balance modulation) is included in wherein as " leakage sound ".The low territory side (mainly 300Hz ~ 3kHz voiceband) that should " leakage sound " be included in the voice signal after the balance modulation.
The low territory side (low frequency side) of the voice signal after the balance modulation is corresponding to the high territory side (high-frequency side) of the preceding voice signal of balance modulation; To microphone input mainly be sound the time; The composition of high territory side that surpasses voiceband in the original sound (balance modulation before voice signal) is less, so the composition of the low territory side of the voice signal after the balance modulation is also few.Therefore; When having received by other receivers that do not have balanced modulator from voice signal that transmitter sends; The low territory side of the voice signal after the balance modulation, " leakage sound " composition in addition is less, and the result does; Hear " leakage sound " easily, existence can't be guaranteed the problem of secret what is said or talked about property.
Summary of the invention
The present invention makes in order to solve above-mentioned existing problem, and its purpose is to provide a kind of communication system, even in wide band system (system of high tone quality), also can reduce the sound level that leaks sound, can improve secret what is said or talked about property.
A kind of communication system of the present invention comprises: dispensing device is used to send the wide band voice signal that comprises the frequency band higher than voiceband; And receiving system, receive voice signal from above-mentioned dispensing device; Dispensing device comprises: the sound input part, import above-mentioned wide band voice signal; The balance modulation portion makes the height counter-rotating of the frequency of the voice signal that is input to the tut input part; Filtering portion, the signal of the frequency band below voiceband (first preset frequency) in the voice signal that the height through above-mentioned balance modulation portion reversal frequency obtains; And sending part, send the voice signal that obtains by the frequency band below the voiceband through above-mentioned filtering portion; Receiving system comprises: acceptance division receives the voice signal that sends from dispensing device; Contrary balance modulation portion is reversed the height of the frequency of the voice signal that is received by above-mentioned acceptance division once more; And audio output unit, output is through the contrary balance modulation portion voice signal that obtains of the height of reversal frequency once more.
Description of drawings
Fig. 1 is the block diagram of structure of the communication system of expression first execution mode of the present invention.
Fig. 2 is the key diagram of action of the dispensing device (wireless microphone) of first execution mode of the present invention.
Fig. 3 is the key diagram of action of the receiving system (loudspeaker arrangement) of first execution mode of the present invention.
Fig. 4 is the block diagram of structure of the communication system of expression second execution mode of the present invention.
Fig. 5 is the key diagram of action of the dispensing device (wireless microphone) of second execution mode of the present invention.
Fig. 6 is the key diagram of action of the receiving system (loudspeaker arrangement) of second execution mode of the present invention.
Fig. 7 is the block diagram of structure of the communication system of expression other execution modes of the present invention.
Fig. 8 is the key diagram of action of the dispensing device (wireless microphone) of the 3rd execution mode of the present invention.
Fig. 9 is the key diagram of action of the receiving system (loudspeaker arrangement) of the 3rd execution mode of the present invention.
Figure 10 is the block diagram of structure of communication system of the variation of expression the 3rd execution mode of the present invention.
Figure 11 is the key diagram of action of the dispensing device (wireless microphone) of the variation of the 3rd execution mode of the present invention.
Figure 12 is the key diagram of action of the receiving system (loudspeaker arrangement) of the variation of the 3rd execution mode of the present invention.
Embodiment
Below, with the communication system of description of drawings execution mode of the present invention.In this execution mode, illustration is used for the situation of the communication system of wireless microphone system etc.
(first execution mode)
Structure with reference to the communication system of description of drawings first execution mode of the present invention.Fig. 1 is the block diagram of structure of the communication system of this execution mode of expression.As shown in Figure 1, communication system 1 comprises as the wireless microphone 2 of dispensing device with as the loudspeaker arrangement 3 of receiving system.In this communication system 1, the voice signal of transmitting-receiving broadband (sonic-frequency band of 100Hz ~ 15kHz).In addition; In following explanation, the situation of receiving and dispatching the voice signal of 100Hz ~ 15kHz as wide band voice signal with communication system 1 is that example describes, but the frequency band of the voice signal of communication system 1 transmitting-receiving is not limited to this; For example can be 0Hz ~ 15kHz, also can be 100Hz ~ 17kHz.
In addition, in first preset frequency of this illustration as high pass filter 8, cut-off frequency is the situation of 3kHz, but the cut-off frequency of high pass filter 8 is not limited to this certainly.Promptly; In this execution mode; The frequency band of 300Hz ~ 3kHz is handled as voiceband, for all frequency contents in this voiceband, cut-off frequency is made as the 3kHz of the upper limit of voiceband in balance modulation back; But be not to end all frequency contents in the voiceband, so cut-off frequency can be made as the optional frequency between 0 ~ 3kHz.In addition, cut-off frequency can be fixed, and also can be set to according to the sound of being imported and can change.Being background when sending male sex's sound at the musical instrument with supper bass for example, can setting cut-off frequency lower, be background when sending woman voice in the high line with piano etc., can set cut-off frequency more high.
Through in overlapping 10 of the tone signal overlapping tone signal transmit a yard key data (code key data).The tone signal that transmits the sign indicating number key data can only send 1 time in the moment (overlapping with voice signal) of the main power source of connecting wireless microphone 2, perhaps also can connection have wireless microphone 2 main power source during with preset time at interval (overlapping) with voice signal send.
FILTER TO CONTROL portion 9 controls equilibrium modulation circuit 6, LPF7 and HPF8 according to the opening/closing of secret what is said or talked about function.Particularly; When secret what is said or talked about function is opened; FILTER TO CONTROL portion 9 moves equilibrium modulation circuit 6, LPF7 and HPF8 and voice signal is carried out above-mentioned processing (secret what is said or talked about processing), when secret what is said or talked about function is closed, does not make equilibrium modulation circuit 6, LPF7 and HPF8 action and signal is passed through.Secret what is said or talked about function can be through manually switching opening/closing.In addition, secret what is said or talked about function also can reach predetermined reference level at the sound level of voice signal to be opened when above automatically, perhaps also can in voice signal, contain predetermined frequencies and become time-sharing automatic and open.This is because can think that the leakage sound composition after balance modulation under the above-mentioned situation increases.
On the other hand, loudspeaker arrangement 3 comprise from antenna receive voice signal acceptance division 13, to the voice signal that is received carry out the FM demodulation circuit 14 of FM demodulation, from the signal after the FM demodulation, extract tone signal tone signal extraction portion 15, make low pass filter 17 (LPF), the AF amplifier 18 of voice emplifying signal and the loud speaker 19 of output sound signal of the high frequency content of equilibrium modulation circuit 16, the modulating clock frequency in the cutoff balance modulation treatment of processing (balance modulation treatment) of height counter-rotating of frequency of voice signal.The balance modulation treatment of in the equilibrium modulation circuit 16 of this loudspeaker arrangement 3, carrying out is reversed the height of the frequency of the voice signal that the height of frequency reversed the voice signal of height of frequency (equilibrium modulation circuit 6 through wireless microphone 2 reversed) once more.Therefore, the balance modulation treatment of in the equilibrium modulation circuit 16 of loudspeaker arrangement 3, carrying out can also be called contrary balance modulation treatment, and the equilibrium modulation circuit 16 of loudspeaker arrangement 3 can also be called contrary equilibrium modulation circuit.
Tone signal extraction portion 15 extract on the voice signal overlapping tone signal; Carried out secret what is said or talked about when handling when being judged as according to this tone signal, also can handle exactly to the loud speaker output sound through carrying out contrary balance modulation and LPF in loudspeaker arrangement 3 sides in wireless microphone 2 sides.In addition; When having transmitted the sign indicating number key data of the loudspeaker arrangement 3 of hoping reception through tone signal; Also can carry out checking of yard key data; Only when the sign indicating number key data of checking setting in advance sign indicating number key data that success promptly receives from wireless microphone and the loudspeaker arrangement of sign indicating number key data is consistent in fact, output sound signal, thus prevent that other loudspeaker arrangements with contrary balancing circuitry from receiving undeservedly.
In addition, as using tone signal to transmit the method for the control signal of loudspeaker arrangement 3, can also adopt the method that shows the content of control signal according to the difference of the frequency of tone signal.For example, when secret what is said or talked about function is opened, use 30kHz, when controlled function is closed, use 70Hz etc. as the frequency of tone signal as the frequency of tone signal.The frequency that tone signal transmits usefulness can also adopt the for example frequency between 60Hz ~ 80Hz, the 15kHz ~ 90kHz except said frequencies.
In addition; As using tone signal to transmit the method for the control signal of loudspeaker arrangement 3, can also adopt according on the voice signal on level or the phase place or the voice signal of overlapping tone signal overlapping tone signal have or not the method that waits the content that shows control signal.As the method that level or phase place are provided to single-tone, except ASK (amplitude shift keying), PSK (phase shift keying), FSK (frequency shift keying), can adopt modulation such as QAM (quadrature amplitude modulation) and AM, PM, FM.
Action with reference to the communication system 1 of description of drawings said structure.Fig. 2 is the key diagram of action of the wireless microphone 2 of this execution mode.As shown in Figure 2; In the wireless microphone 2 of this execution mode; Comprise voiceband and (during the wide band voice signal of 300Hz ~ 3kHz) (with reference to Fig. 2 (a)), make the balance modulation treatment (with reference to Fig. 2 (b)) of height counter-rotating of the frequency of this voice signal when having imported from microphone 4.Sometimes the part (part of voiceband) of the low territory side of the voice signal after the balance modulation comprises leakage sound; But in this execution mode; The situation of receiving and dispatching the voice signal of 100Hz～15kHz with communication system 1 as wide band voice signal is that example describes; But the frequency band of the voice signal of communication system 1 transmitting-receiving is not limited to this, for example can be 0Hz ~ 15kHz, also can be 100Hz ~ 17kHz.
Fig. 3 is the key diagram of action of the loudspeaker arrangement 3 of this execution mode.As shown in Figure 3; In the loudspeaker arrangement 3 of this execution mode; When receiving (with reference to Fig. 3 (a)) from voice signal that wireless microphone 2 sends; Make the balance modulation treatment (contrary balance modulation treatment) (with reference to Fig. 3 (b)) of the height counter-rotating (counter-rotating once more) of the frequency of this voice signal, export as sound from loud speaker 19.
According to the communication system 1 of this first execution mode of the present invention, in wide band system (system of high tone quality), can reduce from the sound level of the leakage sound of loudspeaker arrangement 3 outputs, can improve secret what is said or talked about property.
In this execution mode, transmitting-receiving comprises than the voiceband (broadband of high frequency band of 300Hz ~ the 3kHz) (voice signal of 100Hz ~ 15kHz) for example for example.At this moment, make the balance modulation treatment of height counter-rotating of the frequency of wide band voice signal through wireless microphone 2, the signal of the frequency band of the low territory side (for example below the 3kHz) in the voice signal after the height counter-rotating of this frequency is ended.Therefore; When even the voice signal of (before the frequency counter-rotating) is included in the voice signal of balance modulation back (after the frequency counter-rotating) as " leakage sound " before balance modulation; The signal of this frequency band (frequency band of low territory side) is also ended, and can suppress to leak sound from loudspeaker arrangement 3 outputs.So, in wide band system (system of high tone quality), can reduce, can improve secret what is said or talked about property from the level of the leakage sound of loudspeaker arrangement 3 outputs.
In addition, in this execution mode, tone signal is overlapping with the voice signal that sends from wireless microphone 2, transmits the sign indicating number key data through this tone signal.Loudspeaker arrangement 3 is output sound signal when the checking successfully of this yard key data only.Thus, loudspeaker arrangement 3 can only be exported the voice signal that is sent from specific wireless microphone 2 (the consistent wireless microphone 2 of sign indicating number key data).
In addition, in this execution mode, in wireless microphone 2, carry out the switching of the signal of the frequency band of low territory side (for example below the 3kHz) in the voice signal after the height counter-rotating of cut-off frequency whether.This switching is that frequency content of the voiceband that comprised in the sound level according to voice signal, the wide band voice signal etc. is suitably carried out.That is,, can think that then leaking the sound composition in balance modulation back also becomes greatly, therefore ends the control in low territory if the sound level of original sound signal is bigger.In addition, the frequency content of voiceband can think that more also the leakage composition after the balance modulation becomes big in wide band voice signal, therefore ends the control in low territory.
(second execution mode)
The communication system 1 of second execution mode of the present invention then, is described.At this, be that the center describes with the communication system 1 of second execution mode and the difference of first execution mode.At this, under situation about not specifying, structure of this execution mode and action are identical with first execution mode.
Fig. 4 is the block diagram of structure of the communication system 1 of this execution mode of expression.As shown in Figure 4, the wireless microphone 2 of this execution mode does not possess high pass filter 8, possesses overlapping 20 of the noise of noise on noise signal on the frequency band below second preset frequency (for example 3kHz) of the voice signal after balance modulation with replacing.As noise signal, for example can use outside the general white noise or coloured noise that noise uses, can also utilize other different sound of the sound that will send etc. with tune etc.On the other hand; Loudspeaker arrangement 3 comprises high pass filter 21 (HPF), and this high pass filter 21 (HPF) be that cut-off frequency ends this frequency content (the overlapping part that noise signal is arranged) below cut-off frequency with second preset frequency (for example 3kHz) the voice signal that receives from wireless microphone 2.When noise signal in wireless microphone 2 when overlapping, makes high pass filter 21 actions through overlapping 20 of noise, but also can do not utilize overlapping 20 of noise overlapping high pass filter 21 is failure to actuate during noise signal.
At this moment, the wireless microphone 2 and first execution mode likewise comprise the overlapping portion of tone signal, and the difference of the action/non-action of the high pass filter 21 of loudspeaker arrangement 3 is identical with first execution mode, transmit through tone signal etc. from wireless microphone 2 sides.In addition, at this, illustration the frequency of noise signal be the situation below the 3kHz, but the frequency of noise signal is not limited to this certainly.
Action with the communication system 1 of description of drawings said structure.Fig. 5 is the key diagram of action of the wireless microphone 2 of this execution mode.As shown in Figure 5; In the wireless microphone 2 of this execution mode; (during the wide band voice signal (with reference to Fig. 5 (a)) of 300kHz ~ 3kHz), make the balance modulation treatment (with reference to Fig. 5 (b)) of height counter-rotating of the frequency of this voice signal when comprise voiceband from microphone 4 input.Sometimes the part (part of voiceband) of the low territory side of the voice signal after the balance modulation comprises leakage sound; But in this execution mode; Noise signal arranged in that this part (comprising the part of leaking sound) is overlapping, send the voice signal (with reference to Fig. 5 (c)) that leaks the sound conductively-closed.
Fig. 6 is the key diagram of action of the loudspeaker arrangement 3 of this execution mode.As shown in Figure 6; In the loudspeaker arrangement 3 of this execution mode; When receiving the voice signal (with reference to Fig. 6 (a)) that sends from wireless microphone 2, second preset frequency in this voice signal is that the frequency content (the overlapping part that noise signal is arranged) below the cut-off frequency (for example 3kHz) is ended (with reference to Fig. 6 (b)).Afterwards, make the balance modulation treatment (contrary balance modulation treatment) (with reference to Fig. 6 (c)) of the height counter-rotating (counter-rotating once more) of the frequency of voice signal, export as sound from loud speaker 19.
According to the communication system 1 of this second execution mode of the present invention, also can obtain the action effect same with first execution mode.That is, in wide band system (system of high tone quality), can reduce, can improve secret what is said or talked about property from the sound level of the leakage sound of loudspeaker arrangement 3 outputs.
In this execution mode, noise on noise signal on the frequency band of the low territory side (for example below the 3kHz) in the voice signal through wireless microphone 2 after the height counter-rotating of frequency.Therefore; When even the voice signal of (before the frequency counter-rotating) is included in the voice signal of balance modulation back (after the frequency counter-rotating) as " leakage sound " before balance modulation; The signal of this frequency band (frequency band of low territory side), can make from the leakage sound of loudspeaker arrangement 3 outputs to be difficult to hear in conductively-closed acoustically owing to noise signal.Like this, in wide band system (system of high tone quality), can shield, can improve secret what is said or talked about property from the leakage sound of loudspeaker arrangement 3 outputs.
(the 3rd execution mode)
The communication system 1 of the 3rd execution mode of the present invention then, is described.The 3rd execution mode is equivalent to the combination of first execution mode and second execution mode.Below, omit the content of in first execution mode or second execution mode, having explained.
Fig. 7 is the block diagram of structure of the communication system 1 of this execution mode of expression.As shown in Figure 7, the wireless microphone 2 of the communication system 1 of this execution mode comprises overlapping 10 of the high pass filter 8 of first execution mode, FILTER TO CONTROL portion 9 and tone signal, and comprises overlapping 20 of the noise of second execution mode.
In the wireless microphone 2 of this execution mode; Control according to FILTER TO CONTROL portion 9; After the frequency content below first preset frequency (for example 3kHz) of the voice signal of high pass filter 8 after balance is modulated, overlapping 20 noise on noise signal on the frequency band below second preset frequency (for example 3kHz) of noise.In addition, in this execution mode, the frequency band of noise on noise signal is consistent with passing through overlapping 20 of noise for the frequency band of ending through high pass filter 8.That is overlapping 20 noise on noise signal on the quilt frequency band of ending of noise, through high pass filter 8.
The loudspeaker arrangement 3 of the communication system 1 of this execution mode comprises the tone signal extraction portion 15 of first execution mode, and comprises the high pass filter 21 of second execution mode.Tone signal extraction portion 15 extract on the voice signal overlapping tone signal; Carried out secret what is said or talked about when handling when being judged as according to this tone signal in wireless microphone 2 sides; Composition for voiceband is ended and the overlapping voice signal that noise signal is arranged, and high pass filter 21 is by the overlapping frequency content that this noise signal is arranged.
Action with the communication system 1 of description of drawings said structure.Fig. 8 is the key diagram of action of the wireless microphone 2 of this execution mode.As shown in Figure 8; In the wireless microphone 2 of this execution mode; (during the wide band voice signal (with reference to Fig. 8 (a)) of 300Hz ~ 3kHz), make the balance modulation treatment (with reference to Fig. 8 (b)) of height counter-rotating of the frequency of this voice signal when comprise voiceband from microphone 4 input.Sometimes the part (part of voiceband) of the low territory side of the voice signal after the balance modulation comprises leakage sound; But in this execution mode; This part (comprising the part of leaking sound) is ended by high pass filter 8, becomes not comprise the voice signal (with reference to Fig. 8 (c)) that leaks sound.
In this execution mode, through high pass filter 8 after comprising the part of leaking sound, in the noise signal of overlapping that this quilt ends, transmission does not comprise the voice signal (with reference to Fig. 8 (d)) that leaks sound.In addition; In this execution mode, the situation of receiving and dispatching the voice signal of 100Hz ~ 15kHz as wide band voice signal with communication system 1 is that example describes, but the frequency band of the voice signal of communication system 1 transmitting-receiving is not limited to this; For example can be 0Hz ~ 15kHz, also can be 100Hz ~ 17kHz.
Fig. 9 is the key diagram of action of the loudspeaker arrangement 3 of this execution mode.As shown in Figure 9; In the loudspeaker arrangement 3 of this execution mode; When receiving from voice signal (with reference to Fig. 9 (a)) that wireless microphone 2 sends, second preset frequency in this voice signal is that the frequency content (the overlapping part that noise signal is arranged) below the cut-off frequency (for example 3kHz) is ended (with reference to Fig. 9 (b)).Afterwards, make the balance modulation treatment (contrary balance modulation treatment) (with reference to Fig. 9 (c)) of the height counter-rotating (counter-rotating once more) of the frequency of voice signal, export as sound from loud speaker 19.
According to this communication system 1, also can obtain the action effect of first execution mode or second execution mode.Particularly when comparing, even, also have the inadequate situation of this removal effect to possibly comprise the frequency band of leaking sound and ended this frequency content in this voice signal the time with first execution mode.Therefore, through this execution mode, the noise signal of further overlapping this frequency content, thus can improve secret what is said or talked about property.In addition, the order of overlapping 20 of overlapping 10 of the tone signal in the wireless microphone 2 and noise also can be the order opposite with diagram.
(variation of the 3rd execution mode)
Figure 10 is the block diagram of structure of communication system 1 of the variation of expression the 3rd execution mode.In this variation; In wireless microphone 2; Overlapping 20 of noise noise on noise signal on the frequency band below second preset frequency (for example 3kHz) of the voice signal after the balance modulation at first; For the overlapping voice signal that noise signal is arranged like this, the frequency content of high pass filter 8 below first preset frequency (for example 3kHz).In addition, also consistent with the frequency band of ending through high pass filter 8 through the frequency band of overlapping 20 noise on noise signal of noise in this variation, high pass filter 8 is by through overlapping 20 of noise and the overlapping frequency content of noise signal.
The loudspeaker arrangement 3 of this variation has the structure identical with the loudspeaker arrangement of first execution mode 3.This be because; Different with the 3rd execution mode shown in Figure 7; Having ended the voice signal of the frequency content below first preset frequency from wireless microphone 2 transmissions through high pass filter 8, is not reuse this frequency content of HPF Cutoff in the loudspeaker arrangement 3 at receiving system therefore.
Action with the communication system 1 of description of drawings said structure.Figure 11 is the key diagram of action of the wireless microphone 2 of this variation.Shown in figure 11; In the wireless microphone 2 of this variation; (during the wide band voice signal (with reference to Figure 11 (a)) of 300kHz ~ 3kHz), make the balance modulation treatment (with reference to Figure 11 (b)) of height counter-rotating of the frequency of this voice signal when comprise voiceband from microphone 4 input.Sometimes the part (part of voiceband) of the low territory side of the voice signal after balance modulation comprises leakage sound, but in this variation, noise signal, leakage sound conductively-closed (with reference to Figure 11 (c)) is arranged in that this part (comprising the part of leaking sound) is overlapping.
In this variation, after overlapping 20 shield pack contained the part of leaking sound through noise, the part of this conductively-closed was ended by high pass filter 8, sent not comprise the voice signal (with reference to Figure 11 (c)) that leaks sound.
Figure 12 is the key diagram of action of the loudspeaker arrangement 3 of this variation.Shown in figure 12; In the loudspeaker arrangement 3 of this variation; When receiving from voice signal (with reference to Figure 12 (a)) that wireless microphone 2 sends; Make the balance modulation treatment (contrary balance modulation treatment) (with reference to Figure 12 (b)) of the height counter-rotating (counter-rotating once more) of the frequency of this voice signal, export as sound from loud speaker 19.
Through this communication system 1, also can obtain the action effect of first execution mode or second execution mode.Particularly when comparing with second execution mode, though to possibly comprise the frequency band of leaking sound overlapping during noise signal, also have the inadequate situation of its noise excessive effects.Therefore, further end this frequency content through this variation, thereby can improve secret what is said or talked about property.
As stated, a kind of communication system that execution mode of the present invention is related comprises: dispensing device, send the wide band voice signal that comprises the frequency band higher than voiceband; And receiving system, receiving voice signal from dispensing device, dispensing device comprises: the sound input part, import wide band voice signal; The balance modulation portion makes the height counter-rotating of the frequency of the voice signal that is input to the sound input part; Filtering portion, the signal of the frequency band below the voiceband (first preset frequency) in the voice signal that the height through above-mentioned balance modulation portion reversal frequency obtains; And sending part, send the voice signal that obtains by the frequency band below the voiceband (first preset frequency) through filtering portion; Receiving system comprises: acceptance division receives the voice signal that sends from dispensing device; Contrary balance modulation portion is reversed the height of the frequency of the voice signal that is received by acceptance division once more; And audio output unit, output is through the contrary balance modulation portion voice signal that obtains of the height of reversal frequency once more.
According to this structure, can improve secret what is said or talked about property and receive and dispatch and comprise than the voiceband (broadband of high frequency band of 300Hz ~ the 3kHz) (voice signal of 100Hz ~ 15kHz) for example for example.At this moment; The balance modulation treatment of the height counter-rotating of the frequency that dispensing device (for example wireless microphone) makes wide band voice signal is provided, and the height of this frequency is inverted and the signal of the frequency band of low territory side (for example below the 3kHz) in the voice signal that obtains is ended.Therefore; When even the voice signal of (before the frequency counter-rotating) is included in the voice signal of balance modulation back (after the frequency counter-rotating) as " leakage sound " before balance modulation; The signal of this frequency band (frequency band of low territory side) is also ended, and can suppress to leak sound and export from receiving system (for example loudspeaker arrangement).So, in wide band system (system of high tone quality), can reduce, can improve secret what is said or talked about property from the level of the leakage sound of receiving system output.
In addition; In the related communication system of execution mode of the present invention; Dispensing device comprises the overlapping portion of noise; Noise on noise signal on the frequency band below the voiceband in the voice signal that overlapping of this noise obtains in the height counter-rotating of frequency, for through overlapping of noise overlapping the voice signal that obtains of noise signal, the signal of the frequency band of filter below voiceband.
According to this structure, to possibly comprise the frequency band of leaking sound overlapping during noise signal, even this noise excessive effects is insufficient, by this frequency content, also can improve secret what is said or talked about property through further.
In addition; In the related communication system of execution mode of the present invention; Dispensing device comprises the overlapping portion of noise; Overlapping of this noise is through filtering portion noise on noise signal on the frequency band below the voiceband in the voice signal that the signal of the frequency band below the voiceband obtains, and receiving system comprises noise cutting off portion, and this noise cutting off portion ends the signal of the frequency band below second preset frequency in the voice signal that is received.
According to this structure,,,, also can improve secret what is said or talked about property through the further noise signal of overlapping this frequency content even this removal effect is insufficient to possibly comprise the frequency band of leaking sound and ended this frequency content in this voice signal the time.
In addition; In the related communication system of execution mode of the present invention; Dispensing device comprises the overlapping portion of tone signal; Overlapping of this tone signal is the overlapping tone signal that comprises the control signal that is used to control receiving system on the voice signal that sends through sending part, and receiving system carries out the control of the action of contrary balance modulation portion according to the control signal that is comprised in the tone signal.
According to this structure, overlapping tone signal on the voice signal that sends from dispensing device (for example wireless microphone) transmits the control signal that is used to control receiving system through this tone signal.Receiving system (for example loudspeaker arrangement) can be controlled the action of contrary balance modulation portion accordingly according to this control signal and with the opening/closing of the secret what is said or talked about function of dispensing device side.
In addition; In the related communication system of execution mode of the present invention, dispensing device comprises the overlapping portion of tone signal, overlapping overlapping tone signal that is used to transmit yard key data on the voice signal that sends through sending part of this tone signal; Receiving system comprises that a yard key checks portion; The consistent of sign indicating number key that is comprised in the above-mentioned tone signal and yard key of being scheduled to detects in this yard key portion of checking, when detecting above-mentioned unanimity in this yard key portion of checking, from the audio output unit output sound signal.
According to this structure, overlapping tone signal on the voice signal that sends from dispensing device (for example wireless microphone) transmits the sign indicating number key data through this tone signal.Receiving system (for example loudspeaker arrangement) is output sound signal when the checking successfully of this yard key data only.Thus, receiving system can only be exported the voice signal that sends from specific dispensing device (the consistent dispensing device of sign indicating number key data).
In addition; In the related communication system of execution mode of the present invention, whether dispensing device carries out through the switching of filtering portion by the signal of the frequency band below the voiceband according to the size of the frequency content of the voiceband that is comprised in the level of the voiceband of the action/non-action of balance modulation portion or voice signal or the wide band voice signal.
According to this structure, whether carry out height to frequency through dispensing device and be inverted the switching that the signal of the frequency band of the low territory side (for example below the 3kHz) in the voice signal that obtains ends.This switching is suitably to carry out according to the size of the frequency content of the voiceband that is comprised in the level of the voiceband of the action of balance modulation portion/non-action or voice signal or the wide band voice signal.
In addition, a kind of communication system that execution mode of the present invention is related comprises: dispensing device, send the wide band voice signal that comprises the frequency band higher than voiceband; And receiving system, receiving voice signal from dispensing device, dispensing device comprises: the sound input part, import wide band voice signal; The balance modulation portion makes the height counter-rotating of the frequency of the voice signal that is input to the sound input part; The overlapping portion of noise, noise on noise signal on the frequency band below the voiceband in the voice signal that the height through balance modulation portion reversal frequency obtains; And sending part, send the voice signal that obtains through overlapping noise on noise signal of noise; Receiving system comprises: acceptance division receives the voice signal that sends from dispensing device; Noise cutting off portion, the signal of the frequency band below the voiceband in the voice signal that receives by acceptance division; Contrary balance modulation portion is reversed the height of the frequency of the voice signal that is received by acceptance division once more; And audio output unit, output is through the contrary balance modulation portion voice signal that obtains of the height of reversal frequency once more.
According to this system,, also can reduce the sound level that leaks sound, thereby improve secret what is said or talked about property through adding the shield effectiveness that causes by the noise in the wide band system (system of high tone quality) with likewise above-mentioned.
In addition; In the related communication system of execution mode of the present invention; Dispensing device comprises the overlapping portion of tone signal; Overlapping of this tone signal is the overlapping tone signal that comprises the control signal that is used to control receiving system on the voice signal that sends through sending part, and receiving system carries out the control of the action of noise cutting off portion according to the control signal that is comprised in the tone signal.
According to this structure, overlapping tone signal on the voice signal that sends from dispensing device (for example wireless microphone) transmits the control signal that is used to control receiving system through this tone signal.Receiving system (for example loudspeaker arrangement) can according to this control signal and with the dispensing device side in the overlapping/non-overlapped action of controlling noise cutting off portion accordingly of the noise that is used for secret what is said or talked about.
In addition, a kind of dispensing device that execution mode of the present invention is related uses in transmitting-receiving comprises the communication system of wide band voice signal of the frequency band higher than voiceband, and dispensing device comprises: the sound input part, import wide band voice signal; The balance modulation portion makes the height counter-rotating of the frequency of the voice signal that is input to the sound input part; Filtering portion, the signal of the frequency band below the preset frequency in the voice signal that the height through balance modulation portion reversal frequency obtains; And sending part, send the voice signal that obtains by the frequency band below the preset frequency through filtering portion; In the receiving system that communication system had, receive the voice signal that sends from dispensing device, the height of the frequency of the voice signal that is received is by counter-rotating once more, and the height of output frequency is by the voice signal that reverses once more and obtain.
According to this device, with likewise above-mentioned, the sound level that also can reduce the leakage sound in the wide band system (system of high tone quality) improves secret what is said or talked about property.
In addition; A kind of receiving system that execution mode of the present invention is related;, transmitting-receiving uses in comprising the communication system of wide band voice signal of the frequency band higher than voiceband; In the dispensing device that communication system had, import wide band voice signal, the height of the frequency of the voice signal of being imported is inverted; The height of frequency is inverted and the signal of frequency band below the voiceband in the voice signal that obtains is ended, send below the voiceband frequency band by by and the voice signal that obtains; Receiving system comprises: acceptance division receives the voice signal that sends from dispensing device; Contrary balance modulation portion is reversed the height of the frequency of the voice signal that is received by acceptance division once more; And audio output unit, output is through the contrary balance modulation portion voice signal that obtains of the height of reversal frequency once more.
According to this device, with likewise above-mentioned, the sound level that also can reduce the leakage sound in the wide band system (system of high tone quality) improves secret what is said or talked about property.
In addition, a kind of communication means that execution mode of the present invention is related is implemented in communication system, and this communication system comprises: dispensing device, send the wide band voice signal that comprises the frequency band higher than voiceband; And receiving system, receive voice signal from this dispensing device; In dispensing device, import wide band voice signal, make the height counter-rotating of the frequency of the voice signal of being imported; The height of cut-off frequency is inverted and the signal of frequency band below the voiceband in the voice signal that obtains; The frequency band that sends below the voiceband is ended the voice signal that obtains, and in receiving system, receives the voice signal that sends from dispensing device; The height of frequency of the voice signal of reception is reversed once more, and the height of output frequency is by the voice signal that reverses once more and obtain.
According to this method, with likewise above-mentioned, the sound level that also can reduce the leakage sound in the wide band system (system of high tone quality) improves secret what is said or talked about property.
Label declaration
1 communication system
2 wireless microphones
3 loudspeaker arrangements
4 microphones
The 5AF amplifier
6 equilibrium modulation circuits
7 low pass filters
8 high pass filters
9 FILTER TO CONTROL portions
The overlapping portion of 10 tone signals
The 11FM modulation circuit
12 sending parts
13 acceptance divisions
The 14FM demodulator circuit
15 tone signal extraction portions
16 equilibrium modulation circuits
17 low pass filters
The 18AF amplifier
19 loud speakers
The overlapping portion of 20 noises
21 high pass filters
Claims (11)
1. communication system comprises: dispensing device, send the wide band voice signal that comprises the frequency band higher than voiceband; And receiving system, receiving voice signal from above-mentioned dispensing device, above-mentioned communication system is characterised in that,
Above-mentioned dispensing device comprises:
The sound input part is imported above-mentioned wide band voice signal;
The balance modulation portion makes the height counter-rotating of the frequency of the voice signal that is input to the tut input part;
Filtering portion, the signal of the frequency band below the voiceband in the voice signal that the height through above-mentioned balance modulation portion counter-rotating said frequencies obtains; And
Sending part sends the voice signal that obtains by the frequency band below the voiceband through above-mentioned filtering portion;
Above-mentioned receiving system comprises:
Acceptance division receives the voice signal that sends from above-mentioned dispensing device;
Contrary balance modulation portion is reversed the height of the frequency of the voice signal that is received by above-mentioned acceptance division once more; And
Audio output unit, output is through the above-mentioned contrary balance modulation portion voice signal that obtains of the height of reversal frequency once more.
2. communication system according to claim 1 is characterized in that,
Above-mentioned dispensing device comprises the overlapping portion of noise, noise on noise signal on the frequency band below the voiceband in the voice signal that overlapping of this noise obtains in the height counter-rotating of said frequencies,
For through overlapping of above-mentioned noise overlapping the voice signal that obtains of noise signal, the signal of the frequency band of above-mentioned filtering portion below voiceband.
3. communication system according to claim 1 is characterized in that,
Above-mentioned dispensing device comprises the overlapping portion of noise, and overlapping of this noise is through above-mentioned filtering portion noise on noise signal on the frequency band below the voiceband in the voice signal that the signal of the frequency band below the voiceband obtains,
Above-mentioned receiving system comprises noise cutting off portion, and this noise cutting off portion ends the signal of the frequency band below said second preset frequency in the tut signal that is received.
4. communication system according to claim 1 is characterized in that,
Above-mentioned dispensing device comprises the overlapping portion of tone signal, and overlapping of this tone signal is the overlapping tone signal that comprises the control signal that is used to control above-mentioned receiving system on the voice signal that sends through above-mentioned sending part,
Above-mentioned receiving system carries out the control of the action of above-mentioned contrary balance modulation portion according to the above-mentioned control signal that is comprised in the above-mentioned tone signal.
5. communication system according to claim 4 is characterized in that,
Above-mentioned dispensing device comprises the overlapping portion of tone signal, overlapping overlapping tone signal that is used to transmit yard key data on the voice signal that sends through sending part of this tone signal,
Above-mentioned receiving system comprises that a yard key checks portion, and the consistent of the sign indicating number key that comprised in the above-mentioned tone signal and predetermined yard key detects in this yard key portion of checking,
When this yard key portion of checking detects above-mentioned unanimity, from tut efferent output tut signal.
6. according to each described communication system in the claim 1 to 5, it is characterized in that,
Above-mentioned dispensing device is according to the size of the frequency content of the voiceband that is comprised in the level of the voiceband of the action/non-action of above-mentioned balance modulation portion or tut signal or the wide band voice signal, whether carries out the switching through the signal of the frequency band of above-mentioned filtering portion below voiceband.
7. communication system comprises:
Dispensing device sends the wide band voice signal that comprises the frequency band higher than voiceband; And receiving system, receiving voice signal from above-mentioned dispensing device, above-mentioned communication system is characterised in that,
Above-mentioned dispensing device comprises:
The sound input part is imported above-mentioned wide band voice signal;
The balance modulation portion makes the height counter-rotating of the frequency of the voice signal that is input to the tut input part;
The overlapping portion of noise, noise on noise signal on the frequency band below the voiceband in the voice signal that the height through above-mentioned balance modulation portion counter-rotating said frequencies obtains; And
Sending part, send through overlapping of above-mentioned noise overlapping the voice signal that obtains of above-mentioned noise signal;
Above-mentioned receiving system comprises:
Acceptance division receives the voice signal that sends from above-mentioned dispensing device;
Noise cutting off portion, the signal of the frequency band in the voice signal that receives by above-mentioned acceptance division below the voiceband;
Contrary balance modulation portion is reversed the height of the frequency of the voice signal that is received by above-mentioned acceptance division once more; And
Audio output unit, output is through the above-mentioned contrary balance modulation portion voice signal that obtains of the height of reversal frequency once more.
8. communication system according to claim 7 is characterized in that,
Above-mentioned dispensing device comprises the overlapping portion of tone signal, and overlapping of this tone signal is the overlapping tone signal that comprises the control signal that is used to control above-mentioned receiving system on the voice signal that sends through above-mentioned sending part,
Above-mentioned receiving system is according to the above-mentioned control signal that is comprised in the above-mentioned tone signal, carries out the control of the action of above-mentioned noise cutting off portion.
9. dispensing device uses in transmitting-receiving comprises the communication system of wide band voice signal of the frequency band higher than voiceband, and above-mentioned dispensing device is characterised in that, comprising:
The sound input part is imported above-mentioned wide band voice signal;
The balance modulation portion makes the height counter-rotating of the frequency of the voice signal that is input to the tut input part;
Filtering portion, the signal of the frequency band below the voiceband in the voice signal that the height through above-mentioned balance modulation portion reversal frequency obtains; And
Sending part sends the voice signal that obtains by the frequency band below the voiceband through above-mentioned filtering portion;
In the receiving system that above-mentioned communication system had, receive the voice signal that sends from above-mentioned dispensing device, the height of the frequency of the tut signal that is received is by counter-rotating once more, and the height of output said frequencies is by the voice signal that reverses once more and obtain.
10. receiving system uses in transmitting-receiving comprises the communication system of wide band voice signal of the frequency band higher than voiceband,
In the dispensing device that above-mentioned communication system had; Import above-mentioned wide band voice signal; The height of the frequency of the tut signal of being imported is inverted; The height of said frequencies is inverted and the signal of frequency band below the voiceband in the voice signal that obtains is ended, send below the voiceband frequency band by by and the voice signal that obtains
Above-mentioned receiving system is characterised in that, comprising:
Acceptance division receives the voice signal that sends from above-mentioned dispensing device;
Contrary balance modulation portion is reversed the height of the frequency of the voice signal that is received by above-mentioned acceptance division once more; And
Audio output unit, output is through the above-mentioned contrary balance modulation portion voice signal that obtains of the height of reversal frequency once more.
11. a communication means is implemented in communication system, this communication system comprises: dispensing device, send the wide band voice signal that comprises the frequency band higher than voiceband; And receiving system, receiving voice signal from this dispensing device, above-mentioned communication means is characterised in that,
In above-mentioned dispensing device; Import above-mentioned wide band voice signal; Make the height counter-rotating of the frequency of the tut signal of being imported; Be inverted and the signal of the frequency band below the voiceband in the voice signal that obtains by the height of said frequencies, send below the voiceband frequency band by by and the voice signal that obtains
In above-mentioned receiving system, receive the voice signal that sends from above-mentioned dispensing device, the height of frequency of the tut signal of reception is reversed once more, the height of output said frequencies is by the voice signal that reverses once more and obtain.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-257610 | 2010-11-18 | ||
| JP2010257610A JP5350351B2 (en) | 2010-11-18 | 2010-11-18 | COMMUNICATION SYSTEM, TRANSMISSION DEVICE, RECEPTION DEVICE, AND COMMUNICATION METHOD |
| PCT/JP2011/006154 WO2012066739A1 (en) | 2010-11-18 | 2011-11-02 | Communication system and communication method |
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| Publication Number | Publication Date |
|---|---|
| CN102783070A true CN102783070A (en) | 2012-11-14 |
| CN102783070B CN102783070B (en) | 2015-03-04 |
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| CN201180011892.XA Expired - Fee Related CN102783070B (en) | 2010-11-18 | 2011-11-02 | Communication system and communication method |
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| JP (1) | JP5350351B2 (en) |
| CN (1) | CN102783070B (en) |
| WO (1) | WO2012066739A1 (en) |
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| JP5269940B2 (en) * | 2011-04-22 | 2013-08-21 | パナソニック株式会社 | COMMUNICATION SYSTEM, TRANSMISSION DEVICE, RECEPTION DEVICE, AND COMMUNICATION METHOD |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0237852A (en) * | 1988-07-27 | 1990-02-07 | Nec Corp | Voice secret call device |
| JPH04150427A (en) * | 1990-10-12 | 1992-05-22 | Sony Corp | Privacy telephone device for radio communication equipment |
| JPH0534744U (en) * | 1991-10-09 | 1993-05-07 | ミツミ電機株式会社 | Transmission circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2811696B2 (en) * | 1988-12-16 | 1998-10-15 | ソニー株式会社 | Cordless telephone equipment |
| JPH04249438A (en) * | 1991-02-06 | 1992-09-04 | Mitsubishi Electric Corp | Cordless telephone set equipped with privacy function |
| US5528692A (en) * | 1994-05-03 | 1996-06-18 | Motorola, Inc. | Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset |
-
2010
- 2010-11-18 JP JP2010257610A patent/JP5350351B2/en not_active Expired - Fee Related
-
2011
- 2011-11-02 WO PCT/JP2011/006154 patent/WO2012066739A1/en active Application Filing
- 2011-11-02 CN CN201180011892.XA patent/CN102783070B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0237852A (en) * | 1988-07-27 | 1990-02-07 | Nec Corp | Voice secret call device |
| JPH04150427A (en) * | 1990-10-12 | 1992-05-22 | Sony Corp | Privacy telephone device for radio communication equipment |
| JPH0534744U (en) * | 1991-10-09 | 1993-05-07 | ミツミ電機株式会社 | Transmission circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012109830A (en) | 2012-06-07 |
| JP5350351B2 (en) | 2013-11-27 |
| WO2012066739A1 (en) | 2012-05-24 |
| CN102783070B (en) | 2015-03-04 |
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