CN2647000Y - Volume regulating device for eliminating noise introduced from volume change - Google Patents
Volume regulating device for eliminating noise introduced from volume change Download PDFInfo
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- CN2647000Y CN2647000Y CN 200320100030 CN200320100030U CN2647000Y CN 2647000 Y CN2647000 Y CN 2647000Y CN 200320100030 CN200320100030 CN 200320100030 CN 200320100030 U CN200320100030 U CN 200320100030U CN 2647000 Y CN2647000 Y CN 2647000Y
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Abstract
The utility model discloses a volume regulating device for eliminating noise introduced from volume change belonging to control field for volume regulation, which comprises a digital gain controller containing a PCM frequency input and a PCM frequency output, a digital-analog converter and a power amplifier with an analog signal input and a power output. The PCM frequency output is connected with the input of the digital-analog converter. The output of the digital-analog converter is connected with the analog signal input of the power amplifier. The structure is characterized in that the utility model also comprises a digital gain gradual controller with a digital gain input, wherein, the output of the digital gain gradual controller is connected with the other input of the digital gain controller.
Description
Technical field
The utility model relates to the control field that volume is regulated, and relates in particular to a kind of volume change of eliminating and introduces the device that the volume of noise is regulated.
Background technology
In audio playback system, volume changes and can introduce noise usually when particularly volume change is big when regulating volume.Referring to Fig. 1, volume adjustment device of the prior art comprises digital gain controller, digital to analog converter with pcm audio input and pcm audio output and the power amplifier with power take-off, the pcm audio output is connected with the input of digital to analog converter, and the output of digital to analog converter is connected with the input of described power amplifier.Referring to Fig. 2, for ease of explanation, be example with the voice reproducing of a sinusoidal wave form, should gain can to cause burr occurring in the sinusoidal wave changes in amplitude process be noise to regulated at will in replayed section, this noise can cause discomfort acoustically.The unexpected enhancing of volume simultaneously or weaken the discomfort that also can bring acoustically, thereby need be handled.Following table is carried out the change in gain table of comparisons among Fig. 2.
| GAIN[3∶0] | F | ?E | … | ?2 | ?1 | ?0 |
| Gain | -30dB | -28dB | … | -4dB | -2dB | ?0dB |
The utility model content
At problems of the prior art and deficiency, goal of the invention of the present utility model is introduced the device that the volume of noise is regulated for a kind of volume change of eliminating is provided.The utility model can not produce noise carrying out volume when regulating, and volume also can strengthen or weaken gradually, has avoided the unexpected enhancing of volume or weakens to the discomfort of acoustically bringing.
In order to realize the foregoing invention purpose, the technical solution of the utility model realizes as follows:
A kind of volume change of eliminating is introduced the device that the volume of noise is regulated, and comprises digital gain controller, the digital to analog converter with pcm audio input and pcm audio output and has input end of analog signal and the power amplifier of power take-off.Described pcm audio output is connected with the input of digital to analog converter, and the output of described digital to analog converter is connected with the input end of analog signal of described power amplifier.Its design feature is, also comprises the digital gain gradual change controller with digital gain input, and the output of described digital gain gradual change controller connects another input of described digital gain controller.
The utility model said apparatus also comprises digital zero cross detection circuit, digital gain update controller, the output of described digital gain gradual change controller connects the input a of digital gain update controller, and the output of digital gain update controller connects another input of described digital gain controller.Described pcm audio output also connects the input of described digital zero cross detection circuit, and the output of described digital zero cross detection circuit connects the input b of described digital gain update controller.
The utility model said apparatus also comprises the analog gain gradual change controller with analog gain input, and the output of described analog gain gradual change controller connects another input of described power amplifier.
The utility model said apparatus also comprises simulation zero cross detection circuit, analog gain update controller, the output of described analog gain gradual change controller connects the input a of analog gain update controller, and the output of analog gain update controller connects another input of described power amplifier.The power take-off of described power amplifier also connects the input of described simulation zero cross detection circuit, and the output of described simulation zero cross detection circuit connects the input b of described analog gain update controller.
The gain change step and the gain-adjusted time interval of above-mentioned digital gain gradual change controller and analog gain gradual change controller are configurable.
Null value in the above-mentioned digital zero cross detection circuit is set near the small threshold value the standard null value.
The utility model is owing to adopted digital gain gradual change controller and analog gain gradual change controller, new gain input is not to be directly inputted on digital gain amplifier or the power amplifier, but by digital gain gradual change controller and analog gain gradual change controller, its mechanism of action is when change in gain is big, actual to output to the gain of digital gain amplifier or power amplifier be to taper to the desired value of gain according to a certain predetermined step-length at interval with preset time, and the gain change step and the gain-adjusted time interval are configurable simultaneously.So just significantly reduced the noise of volume when regulating, and volume is to strengthen gradually or weaken, makes acoustically more comfortablely.In addition, the utility model has also increased digital zero passage gain circuitry and has simulated the renewal that the zero passage gain circuitry comes ride gain, has eliminated the remaining sudden change glitch noise of output like this on the basis of gain gradual change controller.
Description of drawings
Fig. 1 is the prior art constructions schematic diagram;
Fig. 2 carries out the sinusoidal waveform figure of gain-adjusted for adopting prior-art devices;
Fig. 3 is the structure principle chart of the utility model embodiment 1;
Fig. 4 carries out the sinusoidal waveform figure of gain-adjusted for adopting the utility model embodiment 1;
Fig. 5 is the partial enlarged drawing of Fig. 4;
Fig. 6 is the structure principle chart of the utility model embodiment 2;
Fig. 7 carries out the sinusoidal waveform figure of gain-adjusted for adopting embodiment 2.
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
Embodiment 1
Referring to Fig. 3, a kind of volume change of eliminating is introduced the device that the volume of noise is regulated, and comprises digital gain controller 1, the digital to analog converter 2 with pcm audio input and pcm audio output and has input end of analog signal and the power amplifier of power take-off 3.Described pcm audio output is connected with the input of digital to analog converter 2, and the output of described digital to analog converter 2 is connected with the input end of analog signal of described power amplifier 3.Present embodiment also comprises digital gain gradual change controller 4 with digital gain input and the analog gain gradual change controller 7 with analog gain input.The output of described digital gain gradual change controller 4 connects another input of described digital gain controller 1.The output of described analog gain gradual change controller 7 connects another input of described power amplifier 3.In the present embodiment, new gain input is not to be directly inputted on digital gain amplifier or the power amplifier, but by digital gain gradual change controller and analog gain gradual change controller, its mechanism of action is when change in gain is big, actual to output to the gain of digital gain amplifier or power amplifier be to taper to the desired value of gain according to a certain predetermined step-length at interval with preset time, and the gain change step and the gain-adjusted time interval are configurable simultaneously.
Referring to Fig. 4 and Fig. 5, the inner actual change process of hardware is-30dB ,-28dB when the user will gain from-30dB (GAIN=0x0f) modulation-14dB (GAIN=0x07), ,-16dB ,-14dB, thereby realize the process of sound crescendo, otherwise then realize the sound reduction process.By Fig. 5, after we noticed the device that uses the utility model embodiment 1, the sine wave that carries out after volume is reconciled was compared with background technology, and the burr on the waveform has lacked a lot, but still jagged existence on the output waveform.
Embodiment 2
Referring to Fig. 6, embodiment 2 also comprises digital zero cross detection circuit 5, digital gain update controller 6, simulation zero cross detection circuit 8, analog gain update controller 9 on the basis of embodiment 1.The output of described digital gain gradual change controller 4 connects the input a of digital gain update controller 6, and the output of digital gain update controller 6 connects another input of described digital gain controller 1.Described pcm audio output also connects the input of described digital zero cross detection circuit 5, and the output of described digital zero cross detection circuit 5 connects the input b of described digital gain update controller 6.The output of described analog gain gradual change controller 7 connects the input a of analog gain update controller 9, the output of analog gain update controller 9 connects another input of described power amplifier 3, the power take-off of described power amplifier also connects the input of described simulation zero cross detection circuit 8, and the output of described simulation zero cross detection circuit 8 connects the input b of described analog gain update controller 9.
Below, the operation principle of analysis zero cross detection circuit.Its amplification relation can be expressed as in the gain amplification system: Vout=Vin*Gain (Vout: output; Vin: input; Gain: gain).Therefore Vout will not be subjected to the influence of change in gain when Vin=0.So changing gain when selecting Vin to be zero, we will can not bring the sudden change glitch noise to output.Thereby we have designed the renewal that digital zero cross detection circuit 5, simulation zero cross detection circuit 8, digital gain update controller 6 and analog gain update controller 8 are come ride gain in circuit.Because the analog signal of power amplifier 3 outputs is a continuous signal, simulation zero cross detection circuit 8 can be realized by the zero offset that detects its output.Because digitized audio signal can be expressed as the centrifugal pump that a null value is shaken up and down, may there be null value accurately after discrete, but show as near the small value of null value, thereby in side circuit, should detect this small threshold value, effective when the renewal enable signal of the amplitude of the digital audio signal that is input to digital zero cross detection circuit 5 numeral zero cross detection circuit 5 outputs during less than this threshold value, otherwise it is invalid to upgrade enable signal.
Following surface analysis gain update controller operation principle.When digital zero cross detection circuit 5 is input to the renewal enable signal of digital gain update controller 6 when invalid, the digital gain that digital gain update controller 6 outputs to digital gain controller 1 keeps currency; When simulation zero cross detection circuit 8 is input to the renewal enable signal of analog gain update controller 9 when invalid, the analog gain that analog gain update controller 9 outputs to power amplifier 3 keeps currency.When digital zero cross detection circuit 5 is input to the renewal enable signal of digital gain update controller 6 when effective, the digital gain that digital gain update controller 6 outputs to digital gain controller 1 is the current gain of digital gain gradual change controller 4; When simulation zero cross detection circuit 8 is input to the renewal enable signal of analog gain update controller 9 when effective, the analog gain that analog gain update controller 9 outputs to power amplifier 3 is the current gain of analog gain gradual change controller 7.
Referring to Fig. 7, adopt the output waveform after this method not have glitch noise.
Claims (6)
1. eliminate the device that volume change is introduced the volume adjusting of noise for one kind, comprise digital gain controller (1) with pcm audio input and pcm audio output, digital to analog converter (2) and have input end of analog signal and the power amplifier of power take-off (3), described pcm audio output is connected with the input of digital to analog converter (2), the output of described digital to analog converter (2) is connected with the input end of analog signal of described power amplifier (3), it is characterized in that, also comprise the digital gain gradual change controller (4) with digital gain input, the output of described digital gain gradual change controller (4) connects another input of described digital gain controller (1).
2. according to the described device of claim 1, it is characterized in that, also comprise digital zero cross detection circuit (5), digital gain update controller (6), the output of described digital gain gradual change controller (4) connects the input a of digital gain update controller (6), the output of digital gain update controller (6) connects another input of described digital gain controller (1), described pcm audio output also connects the input of described digital zero cross detection circuit (5), and the output of described digital zero cross detection circuit (5) connects the input b of described digital gain update controller (6).
3. according to claim 1 or 2 described devices, it is characterized in that also comprise the analog gain gradual change controller (7) with analog gain input, the output of described analog gain gradual change controller (7) connects another input of described power amplifier (3).
4. according to the described device of claim 3, it is characterized in that, also comprise simulation zero cross detection circuit (8), analog gain update controller (9), the output of described analog gain gradual change controller (7) connects the input a of analog gain update controller (9), the output of analog gain update controller (9) connects another input of described power amplifier (3), the power take-off of described power amplifier (3) also connects the input of described simulation zero cross detection circuit (8), and the output of described simulation zero cross detection circuit (8) connects the input b of described analog gain update controller (9).
5. according to the described device of claim 4, it is characterized in that the gain change step and the gain-adjusted time interval of described digital gain gradual change controller (4) and analog gain gradual change controller (7) are configurable.
6. according to the described device of claim 2, it is characterized in that the null value in the described digital zero cross detection circuit (5) is set near the small threshold value the standard null value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320100030 CN2647000Y (en) | 2003-10-08 | 2003-10-08 | Volume regulating device for eliminating noise introduced from volume change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320100030 CN2647000Y (en) | 2003-10-08 | 2003-10-08 | Volume regulating device for eliminating noise introduced from volume change |
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| Publication Number | Publication Date |
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| CN2647000Y true CN2647000Y (en) | 2004-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320100030 Expired - Fee Related CN2647000Y (en) | 2003-10-08 | 2003-10-08 | Volume regulating device for eliminating noise introduced from volume change |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716737A (en) * | 2013-12-31 | 2014-04-09 | 杭州士兰微电子股份有限公司 | Volume adjusting circuit and method |
| CN106464987A (en) * | 2015-03-11 | 2017-02-22 | 华为技术有限公司 | Terminal device, and signal transmission method and device |
-
2003
- 2003-10-08 CN CN 200320100030 patent/CN2647000Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716737A (en) * | 2013-12-31 | 2014-04-09 | 杭州士兰微电子股份有限公司 | Volume adjusting circuit and method |
| CN103716737B (en) * | 2013-12-31 | 2017-07-14 | 杭州士兰微电子股份有限公司 | Volume control circuit and method |
| CN106464987A (en) * | 2015-03-11 | 2017-02-22 | 华为技术有限公司 | Terminal device, and signal transmission method and device |
| CN106464987B (en) * | 2015-03-11 | 2019-10-22 | 华为技术有限公司 | Terminal device, the sending method of signal and device |
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| CF01 | Termination of patent right due to non-payment of annual fee |