CN1208984C - Self-adapting ringing unit cooperate with chord ring - Google Patents
Self-adapting ringing unit cooperate with chord ring Download PDFInfo
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- CN1208984C CN1208984C CN02111043.3A CN02111043A CN1208984C CN 1208984 C CN1208984 C CN 1208984C CN 02111043 A CN02111043 A CN 02111043A CN 1208984 C CN1208984 C CN 1208984C
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Abstract
The present invention relates to a self-adapting ringing device matched with a chord ring, which is used for a portable mobile communication terminal. The present invention comprises a microphone, an analog-to-digital converter, a main controller, a digital-to-analog converter, an audio amplifier, a sounding body and a digital signal processor, wherein the microphone, the analog-to-digital converter, the main controller, the digital-to-analog converter, the audio amplifier and the sounding body are orderly connected by a circuit; the digital signal processor forms two-way circuit connection with the main controller; the main controller is provided with a music instrument digital output port which conveying music instrument digital signals to the digital-to-analog converter. The present invention is characterized in that a. the main controller is also provided with one pulse width modulation signal output port which forms controllable circuit connection with the audio amplifier, and the pulse width modulation signal output port conveys pulse width modulation signals to the audio amplifier as required; b. a self-adapting control program receiving the conveying control of the main controller and matching with a chord ring resides in the nonvolatile memory of the communication terminal; c. a background noise threshold value table is preset and stored in the program storage area of the nonvolatile memory of the communication terminal, and the background noise threshold value table receives the call of the self-adapting control program. The present invention can still have soft ringing and accentuate individuality, and the present invention has the advantages that the present invention overcomes the defect that an incoming call is easy to miss in a noisy environment, and power consumption does not need to be increased.
Description
Technical field
The present invention relates to a kind of incoming call ringing set that is applied to various portable mobile communication terminals, specifically, be a kind of feature and Digital Signal Processing that utilizes audio signal, for stereo, chord, the self adaptation adjusting of the function of class MIDI (Music Instrument Digital Interface musical instrument digital interface) ring and the modifying device of efficient.
Background technology
Ringer function in the portable mobile communication terminal mainly is divided into two kinds at present, one class is based on PWM (pulse-width modulation) technology, directly drive the ring mode of Buzzer (buzzer) with frequency information, because it is simple in structure, realize easily, with low cost, be widely used in all kinds of portable mobile communication terminals.But because this Terminal Type is the consumer products with very strong personalization, people need softer, and melodious the tinkle of bells embodies the individual character of making widely known, and are therefore various stereo, and chord, class MIDI the tinkle of bells begin to use gradually.These tunes are often passed through electronic synthesizer, with synthetic digital audio and video signals process DAC (digital to analog converter), by audio-frequency power amplifier, directly output among the better Speaker of Frequency Response (loud speaker) and play, again to reach better music effect.But this mode has been brought a problem, and soft ring feels it is sound " little " to the people's, in noisy environment, in the downtown area, on the bus tool, misses incoming call easily.The method that at present this problem is had two kinds of solutions, a kind of is to set contextual model, but needs artificial at every turn preestablishing, and forgets easily.Another kind of mode is the progressive function of so-called the tinkle of bells, but because the progressive time is very short, reaches maximum again rapidly in several seconds, performs practically no function.Therefore, for stereo, chord, how soft melodious ringer function such as class MIDI guarantees not miss incoming call, just need to have become a problem of solution.
Summary of the invention
Purpose of the present invention is exactly the technical problem that addresses the portable mobile communication terminal ring, and provide a kind of self-adapting ringing that cooperates chord ring, make and to guarantee quietly reminding incoming call with soft melodious the tinkle of bells in the environment, show individual character especially, again can be in noisy environment intelligence reach the purpose that is difficult for missing incoming call, consider the feature of portable mobile product simultaneously, blindly do not cause the waste of power.
In order to determine technical solution of the present invention: at first investigate various soft melodious class MIDI ring modes, they have all adopted bore and the bigger loud speaker of power output, this has just brought bigger current drain, the musical sound of its output presses all no less than the traditional approach that adopts Buzzer at loudness harmony, yet really allows the people produce the sensation of sound " little " easily.This wherein involves the auditory psychology model of people's ear.
In the auditory model of people's ear, people's ear itself has certain restriction thresholding to the sense of hearing, and so-called exactly static state is sheltered curve, and light (sound pressure level is little) is easier shelters than sound for sound loud more (sound pressure level is big more), and low frequency part is easy to shelter than HFS.Though so just caused its acoustic pressure of sound of high frequency less, to be experienced easily, also existing very strong penetration like the buzzer of washing machine, though sound is little, can be experienced across far.Simultaneously sound has a Mach stem effect, the loud noise on a frequency can cause near by frequency be difficult to experience than small voice, promptly caused a Mach band.For soft class MIDI ring, pleasant musically in order to satisfy to the abundant characteristic of intermediate frequency information impression, therefore, its music information mainly concentrates on intermediate-frequency section, simultaneously very crucial is that a bit its digitized audio message will just enter the simulation part through DAC and amplify, and in portable mobile communication terminal, because the reason of cost and volume, the inversion frequency of its DAC is generally about 3～4KHz, therefore, be equivalent to a LPF (low pass filter), can not send very high-frequency sound, thereby in noisy environment easily by the noise takeover of surrounding environment, even also produce the little illusion of sound with bigger power.And,, therefore be difficult for missing incoming call on every side because PWM without DAC, so can produce more high fdrequency component, is not easy to be covered by noisy environment for the traditional approach ring of adopting Buzzer.
Based on above analysis, the present invention proposes the technical scheme of adaptive ringtone adjusting device, utilize the operational capability more than needed of ubiquitous DSP (digital signal processor) in the current portable mobile communication terminal, at appropriate time point surrounding environment sound is sampled, in order to raise the efficiency, save operation time, only need be to after the very little time period sampling, through time-frequency conversion efficiently, judge the frequency spectrum that it is equivalent as SFT (fourier transform in short-term), thereby have a self-defining grade to judge present located environmental background noise intensity.Then according to defined threshold value, the volume of adaptive interim high jump chord music when ambient noise acquires a certain degree; When ambient noise is great, directly adopt the mode of PWM to drive sounding body, adopt traditional mode to come the ring sounding, thereby avoid the Mach stem effect that ambient noise causes.
In sum, the present invention is achieved in that
The self-adapting ringing of cooperation chord ring of the present invention is used for portable mobile communication terminal, and it comprises:
Microphone circuit, its sampling environment background sound:
Analog to digital converter, its environmental background sound with the microphone circuit sampling converts digital signal to; It is characterized in that, also comprise:
The background noise threshold table, it is for preestablishing and be based upon in the Nonvolatile memory;
Digital signal processor, it can carry out spectrum analysis calculating to digital signal, and calculates current background sound value;
Master control, it can be sent the digital signal of analog to digital converter output into digital signal processor and carry out spectrum analysis calculating; This master control comprises self-adaptive control module, and it can compare current background sound value and threshold value table, selects suitable broadcast mode and volume;
MIDI chord digital music playing module, if the background sound calculated value in the scope that threshold value table is set, then master control starts and calls this module, selects suitable chord ringer volume;
The PWM pulse width modulation module, if the background sound calculated value has exceeded maximum threshold value, then this module is called in the master control startup, adopts the mode of pulse-width modulation to produce the ringing information that originally storage was good;
Audio frequency amplifier, its reception and amplification are from the audio signal of MIDI chord digital music playing module or PWM pulse width modulation module;
Sounding body receives audio signal and output from audio frequency amplifier.
Apparatus of the present invention are that the useful of the stereo chord MIDI ring audio of grace replenished, and one has overcome incoming call is missed in soft ring easily in noisy environment drawback; Its two, adaptive adjusting is more more convenient and effectual than the setting of " contextual model " of prior art, and is existing important especially in the today of being particular about " intellectuality, obfuscation "; Its three, still, show individual character especially, and in noisy environment, also can send music with the mode of PWM relatively quietly having kept the dulect characteristics of chord ring in the environment, make the people be unlikely to upset; Its four, be not raising power blindly in very noisy environment, strengthen loudness, in the hope of covering noise, but look for another way, reduce power consumption in the mode of PWM, reach the purpose of reminding incoming call equally.
Description of drawings
Fig. 1 is the embodiments of the invention circuit theory diagrams
Fig. 2 is the another embodiment of the present invention circuit theory diagrams.
Fig. 3 is a program flow diagram of the present invention.
Embodiment
Provide the present invention according to Fig. 1 and Fig. 3 below and be used for the example of mobile phone and provide the example that is used for wireless PDA, and will cooperate description, ins and outs of the present invention further are provided embodiment according to Fig. 2 and Fig. 3.
Embodiment 1
See also Fig. 1 and Fig. 3: as shown in Figure 1, it is installed in the mobile phone, master control 3 in the present embodiment, adopt the ARM7TDMIE core of 32 kernels, digital signal processor 7 adopts the TMS320C54X series Lead Mega Module kernel of 16 fixed points of Texas Instruments or the ADSP21XX kernel of Analog Devices Inc, and these devices have higher flexibility ratio and customizability; Sounding body 6 adopts the Microspeaker S016J06 of SANYO GS company, its rated impedance 80hm, and 0.2 watt of rated input power, the smooth scope of frequency response is between 1K～8K; Microphone 1 adopts the WM64-BK type that is applicable to the GSM dual-band mobile phone of MAT, leading indicator be signal to noise ratio about 58dB, pickup sensitivity is at F=1KHz, acoustic pressure during for 1Pa is-45dB about.Audio frequency amplifier 5 adopts the LM4862 audio frequency amplifier of National Semiconductor, and leading indicator is 0.5 watt of a peak value difference power output, and total harmonic distortion and noise (THD+N) is less than 0.55%, and PSRR is greater than 50dB for the power rejection ratio.Digital to analog converter 4 is integrated among the ABB (Analog Baseband chip) of mobile phone as general universal external equipment, and resolving power is that 10bit typical case Tsetting settling time is 10 μ s, and the output digital level is 2.2 volts.Analog to digital converter 2 also is integrated among the ABB, and resolving power is 10bit, and reference level is about 1.8 volts.In the program storage area of the Nonvolatile memory of mobile phone, set up predefined background noise threshold table and the resident self application control module of accepting the cooperation chord ring of master control 3 fortune controls again, its flow process as shown in Figure 3, this module invokes of background noise threshold table.Entire work process is: every a definite time period, (such as 10 or 20 minutes), or when mobile phone receives incoming information, open MIC (microphone) circuit 1, sampling environment background sound 200～500ms, and become digital quantity by ADC analog to digital converter 2, under the control of MCU (master control 3), send into DSP (digital signal processor 7) and carry out spectrum analysis calculating,, determine current value according to distribution near white noise spectrum 1～4K.MCU compares the result and the threshold value table of DSP computing then, selects suitable ringer volume.If calculated value is in the threshold value table setting range, just enter the preceding numerical value of DAC (digital to analog converter 4) and control the volume of MIDI chord ring by control, be equivalent to apply mechanically automatically contextual model, the music numerical value in this time is emitted through audio frequency amplifier 5 and loud speaker 6 by DAC again; If calculated value has exceeded maximum threshold value, MCU does not call MIDI chord digital music playing module with regard to not starting, and calls another section program, is exactly the PWM pulse width modulation module, by audio frequency amplifier 5, drives loud speaker 6 yet.Inlet 33 is accepted the input port of the digital signal of ADC in the master control 3, and delivery outlet 31 is the digital signal delivery outlet to DAC output MIDI, and mouth 32 is the outlet to audio frequency amplifier 5 output pwm signals.
Embodiment 2
See also Fig. 2 and Fig. 3, it is applied on the PDA, self-adapting ringing in the wireless PDA in essence with mobile phone in consistent, as shown in Figure 2, difference is the selection difference of device, its MCU generally is the risc processor of choosing based on the ARM9 kernel, the perhaps StrongARM of Intel Company, perhaps the Dragon Ball of Motoroal company (imperial pearl) series processors.Because wireless PDA is based on the technical characterstic of wireless modulation-demodulation module, the possibility that can freely customize the DSP algorithm wherein not necessarily is provided, so spectrum analysis that former cause DSP finishes and time-frequency conversion evaluation work will be looked concrete condition and completely or partially be finished by MCU, at this moment just need to revise software, simplify parser, reduce the computation burden of MCU, in this case, the block diagram adjustment as shown in Figure 2.Digital signal processor 7 is comprised in the wireless modulation-demodulation module 9.
In the Nonvolatile memory of PDA resident self-adaptive control module workflow with preset the identical of the basic and embodiment 1 of background noise threshold table.
Consult Fig. 3, the threshold value table that will generate in the time of when producing, will designing in advance in advance as the constant section in the program file be stored in hardware nonvolatile memory (as Flash, E
2PROM etc.) in the program storage area.When whole radio terminal system is worked, the possibility that provides two kinds of triggerings to rerun the current background noise level, the RTC (real-time clock) of first step 201 system has passed through 15 minutes from previous operation Na value (current background noise normalized value), and (this time interval can be by designer's appointment, this sentences and was example in 15 minutes), or its two, step 202 receive that the base station transmits to party call, this moment, system all can produce interruption shown in step 20, and refresh the background noise value of depositing in the current system by ADC sample circuit among the special Voice Band Codec, as step 21,22, shown in 23.In step 21, formally (time span can be drafted when the specific design in experiment with the background noise value in a period of time that ADC sampled that MIC connected by software control, this sentences 350ms is example) read in the RAM of system (random access storage device), shown in step 21,22.Mainly be to finish the conversion of the analogue audio frequency of MIC sampling to digital audio in step 22, for example common 8KHz is that speed is sampled, and finishes digital-to-analogue conversion.Then among the inside DARAM that the digital quantity that converts to is sent into DSP by speech interface and the memory interface of DSP, operation is by the T-F time-frequency conversion block of software control, reach the purpose of spectrum analysis, thereby produce the value of a current noise, shown in step 23.Deposit value in random asccess memory then, and send into main control MCU by memory interface. look into the threshold value table that in internal memory, sets by main control MCU, shown in step 24,25, if find in the threshold value table scope, to have this value, just according to step 26,27, select suitable class MIDI ring back tone value in MCU, this value is exactly the yield value of program control audio frequency output DAC, regulates volume thus.Then voice data is changed into analog quantity output by DAC.If the value that produces in the step 23 has exceeded the upper bound (characteristic of threshold value table has determined that it is not have lower bound) of threshold value table, so just must just can reach the effect of in noisy environment, reminding incoming call with PWM formula sounding principle, therefore will be shown in step 28, open the PWM port by hardware driving, the ringing information that storage originally is good adopts the mode of pulse-width modulation to produce, nationality is reminded incoming call to obtain exceeding the audio signal of environmental background noise spectrum outside covering.This dual mode all will increase power output by audio frequency amplifier, shown in step 29, in order to guarantee the matching of phonation circuit in impedance, the audible device that is adopted preferably adopts the Buz/Speaker dual mode speaker of recommending as preceding, shown in step 30 simultaneously.
Claims (4)
1, a kind of self-adapting ringing that cooperates chord ring is used for portable mobile communication terminal, and it comprises:
Microphone circuit (1), its sampling environment background sound;
Analog to digital converter (2), its environmental background sound with the microphone circuit sampling converts digital signal to; It is characterized in that, also comprise:
The background noise threshold table, it is for preestablishing and be based upon in the Nonvolatile memory;
Digital signal processor, it can carry out spectrum analysis calculating to digital signal, and calculates current background sound value;
Master control (3), it can be sent the digital signal of analog to digital converter (2) output into digital signal processor (7) and carry out spectrum analysis calculating; This master control (3) comprises self-adaptive control module, and it can compare current background sound value and threshold value table, selects suitable broadcast mode and volume;
MIDI chord digital music playing module, if the background sound calculated value in the scope that threshold value table is set, then master control (3) starts calls this module, selects suitable chord ringer volume;
The PWM pulse width modulation module, if the background sound calculated value has exceeded maximum threshold value, then master control (3) starts calls this module, the ringing information that storage originally is good adopts the mode of pulse-width modulation to produce;
Audio frequency amplifier, its reception and amplification are from the audio signal of MIDI chord digital music playing module or PWM pulse width modulation module;
Sounding body receives audio signal and output from audio frequency amplifier.
2, the self-adapting ringing of cooperation chord ring according to claim 1 is characterized in that, described self-adaptive control module is by the preheating setting time interval or accept base station incoming call startup.
3, the self-adapting ringing of cooperation chord ring according to claim 1 is characterized in that, described sounding body is a loud speaker.
4, the self-adapting ringing of cooperation chord ring according to claim 1, it is characterized in that, described master control (3) also can become the two-way circuit on line with wireless modulation-demodulation module (9), and this wireless modulation-demodulation module (9) comprises described digital signal processor (7).
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| CN02111043.3A CN1208984C (en) | 2002-03-14 | 2002-03-14 | Self-adapting ringing unit cooperate with chord ring |
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| CN02111043.3A CN1208984C (en) | 2002-03-14 | 2002-03-14 | Self-adapting ringing unit cooperate with chord ring |
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| CN1208984C true CN1208984C (en) | 2005-06-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102195659A (en) * | 2011-04-11 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Radio set, and frequency modulation (FM) volume control method and device thereof |
| CN107945822B (en) * | 2017-12-29 | 2020-11-20 | 珠海格力电器股份有限公司 | Audio playing circuit, audio player, chip and electronic equipment |
| CN110364134B (en) * | 2019-08-19 | 2022-01-07 | 深圳南云微电子有限公司 | Buzzer driving circuit |
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