CN103888142A

CN103888142A - Method for decomposing acoustical signals by detection technology

Info

Publication number: CN103888142A
Application number: CN201410156797.4A
Authority: CN
Inventors: 曲振强
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-04-18
Filing date: 2014-04-18
Publication date: 2014-06-25

Abstract

The invention provides a method for decomposing acoustical signals by the detection technology. The method comprises the following steps that analog signals are sampled, quantized, encoded and finally converted into digital signals, and the following methods are adopted by the analog signals in the sampling process: the voltage formed by converting sound signals by a microphone is amplified by a sound collecting and amplifying circuit, an analog signal Us of the sound is obtained through a coupling capacitor, the frequency of the sound waves is filtered out through a linear or nonlinear device and a low pass filter, an envelope line of the sound waves is obtained, the envelope line of the sound waves is quantized and encoded, and finally the sound waves are converted into the digital signals. The envelope detection technology is utilized for only collecting the changes of the amplitude in the sampling process of the sound, the useless information is directly filtered out, the envelope line of the sound waves is obtained, then the envelope line of the sound waves is quantized and encoded, the code amount formed by the method is small, in the later quantized and encoded process, processing by a computer is easy, the workloads are reduced, and the work efficiency is improved.

Description

A kind of method of utilizing detection technology to decompose voice signal

Technical field

The invention belongs to technology of acoustic wave field, relate in particular to a kind of method of utilizing detection technology to decompose voice signal.

Background technology

The signal of simulated sound is a continuous quantity, is made up of many sine waves with various amplitude and frequency, and the computer acquisition process of actual sound signal is exactly the digitized processing procedure of sound.Digitized sound is easy to by software processing, and nearly all specialized sound recording, editing machine is all digital form now.Analogue audio frequency digitized process is comprised to sampling, quantification and the coding of audio frequency.Mould/the number conversion of sound, first needs, to sound wave sampling, to use digital form recording voice, and the device of realizing this process is just called as A/D converter.Sampling and the process quantizing can be realized by A/D converter, A/D converter goes sampling with the frequency of fixing, be each period measurement and quantized signal once, voice signal just becomes digital audio and video signals after encoded through sampling and after quantizing, it can be kept at document form in the storage medium of computer, such file is commonly referred to as digital wave file.In prior art during to analog signal sampling, can gather whole amplitude and frequency, again it is compressed, this is comprising much useless information, in the process in the later stage, sound being quantized and encode, cause encoding amount huge, take more storage area, computer processing procedure is more complicated, and fruitless labour is too much.

Summary of the invention

The invention provides a kind of detection technology of utilizing and decompose the method for voice signal, solved in background technology analog signal in the time of sampling, gather garbage too much cause encoding amount huge, deal with more complicated shortcoming.

Technical scheme of the present invention is achieved in that a kind of method of utilizing detection technology to decompose voice signal, comprise the following steps: that analog signal is through over-sampling, quantize, coding, finally change into digital signal, described analog signal adopts following methods in when sampling: microphone converts voice signal to voltage and obtain by coupling capacitance after sound collection amplifying circuit amplifies the analog signal Us of sound, by linearity or nonlinear device and low pass filter elimination HFS, obtain the envelope of sound wave, then the envelope of sound wave is quantized and encoded, finally change into digital signal,

Described linearity or nonlinear device can be diode detector or triode detector or the accurate wave detector of half-wave or the accurate wave detector of all-wave or logarithmic detector or the integrated wave detector of monolithic or integrated RF wave detector.

The invention has the beneficial effects as follows: the present invention utilizes envelope detection technique in the process that sound is sampled, only to gather the variation of amplitude, and directly filter out useless information, obtain the envelope of sound wave, again the envelope of sound wave is quantized and encoded, the last size of code forming of this method is less, quantize and cataloged procedure Computer deals with simplyr in the later stage, greatly reduced workload, greatly improved operating efficiency.

Brief description of the drawings

Fig. 1 is diode peak-detector circuit of the present invention;

Fig. 2 is triode average detecting circuit of the present invention;

Fig. 3 is the accurate detecting circuit of integrated transporting discharging half-wave of the present invention;

Fig. 4 is the envelope line chart of sound wave of the present invention;

Fig. 5 is the positive half cycle detecting circuit of diode peak value of the present invention;

Fig. 6 is figure after the positive half cycle envelope detection of sound wave of the present invention completes;

Fig. 7 is diode peak value negative half period detecting circuit of the present invention;

Fig. 8 is figure after the negative half period envelope detection of sound wave of the present invention completes.

Part explanation: 1, microphone, 2, sound collection amplifying circuit, 3, linearity or nonlinear device, 4, low pass filter.

Embodiment

For Comprehension and Implementation better, below in conjunction with accompanying drawing, the invention will be further described:

Embodiment 1(is shown in Fig. 1, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8): the voltage that microphone 1 converts voice signal to arrives detector diode D1 by coupling capacitance C2 through coupling capacitance C1 after amplifier T1 amplifies, detector diode D1 belongs to nonlinear device, again by the HFS of coupling capacitance C3 elimination sound wave, form sound wave envelope at resistance R 4 two ends, the envelope of sound wave refers to the curve that the summit of sonic wave amplitude forms, Vcc is supply power voltage, R1 and R3 are supplying resistance, and R2 ensures that T1 amplifier is in forward bias.

Fig. 4 Wave line is sound wave, upper and lower two envelopes that dotted line is sound wave of sound wave; In Fig. 5, the analog signal Us after collection is amplified is through the sound wave of diode D1 elimination negative half period, then the low pass filter of process RL and C3 composition, and elimination HFS obtains the positive half cycle envelope Uo of sound wave, i.e. sound wave envelope in Fig. 6.

In Fig. 7, analog signal Us is through the sound wave of the positive half cycle of diode D1 elimination, then the low pass filter of process RL and C3 composition, and elimination HFS obtains the negative half period envelope Uo of sound wave, i.e. sound wave envelope in Fig. 8.

Embodiment 2: see Fig. 2, the analog signal Us of sound is through average detection triode V, and detection triode V belongs to nonlinear device, then the HFS of the low pass filter elimination sound wave consisting of RL and C3, obtain the envelope Uo of sound wave, i.e. sound wave envelope in Fig. 6.Ec provides less bias current for detection triode V, detection triode V is when bias current Ec is smaller, the negative half period of high-frequency signal amplifies smaller, positive half cycle amplification ratio is larger, through such amplifying signal, if filter high-frequency signal, remaining average voltage just changes with high frequency signal amplitude.

Embodiment 3: see Fig. 3, the analog signal Us of sound is through half-wave rectifier, and half-wave rectifier is linear unit,, when Us is timing, integrated transporting discharging N1 is output as negative, thereby causes diode D ₁conducting, D ₂cut-off, R ₂middle electric current is zero, and therefore no signal output, when Us is when negative, is just output as integrated transporting discharging N1, thereby causes diode D ₂conducting, D ₁cut-off, circuit is realized anti-phase scale operation, converts negative half-cycle signal to positive signal output, then the HFS of the anti-phase input low-pass first order filter elimination sound wave consisting of integrated transporting discharging N2 and C, R4, the envelope Uo of output sound wave.

Claims

1. a method of utilizing detection technology to decompose voice signal, comprise the following steps: that analog signal is through over-sampling, quantize, coding, finally change into digital signal, it is characterized in that described analog signal adopts following methods in the time of sampling: the voltage that microphone (1) converts voice signal to obtains the analog signal Us of sound after sound collection amplifying circuit (2) amplifies by coupling capacitance, by linearity or nonlinear device (3) and low pass filter (4) elimination HFS, obtain the envelope of sound wave, then the envelope of sound wave is quantized and encoded, finally change into digital signal.

2. a kind of method of utilizing detection technology to decompose voice signal according to claim 1, is characterized in that described linearity or nonlinear device (3) can be diode detector or triode detector or the accurate wave detector of half-wave or the accurate wave detector of all-wave or logarithmic detector or the integrated wave detector of monolithic or integrated RF wave detector.