CN110768637A - Signal gain control method and electronic device - Google Patents
Signal gain control method and electronic device Download PDFInfo
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- CN110768637A CN110768637A CN201810841817.XA CN201810841817A CN110768637A CN 110768637 A CN110768637 A CN 110768637A CN 201810841817 A CN201810841817 A CN 201810841817A CN 110768637 A CN110768637 A CN 110768637A
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- 230000005236 sound signal Effects 0.000 claims abstract description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a signal gain control method and an electronic device. The method comprises the following steps: detecting the AC impedance of the external device by the AC impedance detector; detecting the DC impedance of the external device by the DC impedance detector; obtaining a gain adjustment value according to the alternating current impedance and the direct current impedance; and adjusting the signal gain of the audio signal output to the external device according to the gain adjustment value.
Description
Technical Field
The present invention relates to signal adjustment technologies, and in particular, to a signal gain control method and an electronic device.
Background
With the advancement of technology, consumers are increasingly focusing on the quality of audio output from multimedia entertainment devices. However, different external audio output devices may have different impedance characteristics. Therefore, when different external audio output devices are connected to the same multimedia entertainment device, the audio playing quality of the different external audio output devices may be good or bad.
Disclosure of Invention
The invention provides a signal gain control method and an electronic device, which can detect the alternating current impedance of an external device and adjust the signal gain of an output signal according to the alternating current impedance, so that the audio playing quality of the external device is kept good and stable.
The embodiment of the invention provides a signal gain control method, which is used for an electronic device comprising an alternating current impedance detector and a direct current impedance detector, wherein the electronic device is connected to an external device. The signal gain control method comprises the following steps: detecting the AC impedance of the external device by the AC impedance detector; detecting the DC impedance of the external device by the DC impedance detector; obtaining a gain adjustment value according to the alternating current impedance and the direct current impedance; and adjusting the signal gain of the output signal output to the external device according to the gain adjustment value.
The embodiment of the invention also provides an electronic device which is connected to the external device. The electronic device comprises an alternating current impedance detector, a direct current impedance detector, a signal processing circuit and a gain control circuit. The alternating current impedance detector is used for detecting the alternating current impedance of the external device. The DC impedance detector is used for detecting the DC impedance of the external device. The signal processing circuit is connected to the alternating current impedance detector and the direct current impedance detector and used for obtaining a gain adjustment value according to the alternating current impedance and the direct current impedance. The gain control circuit is connected to the signal processing circuit and is used for adjusting the signal gain of the output signal output to the external device according to the gain adjustment value.
Based on the above, after detecting the ac impedance and the dc impedance of the external device, a gain adjustment value can be obtained according to the ac impedance and the dc impedance. Then, the gain adjustment value can be used for adjusting the signal gain of the output signal output to the external device, so that the audio playing quality of the external device is kept good and stable.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram of an electronic device and an external device according to an embodiment of the invention.
Fig. 2 is a schematic diagram of ac impedance according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an ac impedance according to another embodiment of the present invention.
Fig. 4 is a flowchart illustrating a signal gain control method according to an embodiment of the present invention.
Fig. 5 is a flowchart illustrating a signal gain control method according to an embodiment of the present invention.
Description of the reference numerals
10: electronic device
11: external device
101: audio input circuit
102: signal processing circuit
103: gain control circuit
104: driving circuit
105: connection interface
106: DC impedance detector
107: AC impedance detector
108: connection detector
109: noise eliminator
S1, S2, RDC, RAC, ON/OFF: signal
S401 to S404, S501 to S511: step (ii) of
Detailed Description
Fig. 1 is a schematic diagram of an electronic device and an external device according to an embodiment of the invention. Referring to fig. 1, the electronic device 10 may be a multimedia entertainment device with an audio output function, such as a smart phone, a tablet computer, a desktop computer, a notebook computer, a television, a set-top box, a game console, or a display. The external device 11 is connected to the electronic device 10. The external device 11 is an audio playing device such as a speaker or an earphone, and is used for converting an audio signal provided by the electronic device 10 into sound and outputting the sound. In the following embodiments, an earphone is taken as an example of the external device 11.
In this embodiment, the electronic device 10 includes an audio input circuit 101, a signal processing circuit 102, a gain control circuit 103, a driving circuit 104, a connection interface 105, a Direct-Current (DC) impedance detector 106, an Alternating-Current (AC) impedance detector 107, and a connection detector 108.
The audio input circuit 101 is configured to receive the signal S1. The signal S1 is an audio signal and may be provided by an internal circuit such as an audio chip (not shown) or a central processing unit (not shown) of the electronic device 10. The audio input circuit 101 may include an Analog-to-Digital converter (ADC) (not shown) and an equalizer (not shown). The audio input circuit 101 may perform analog-to-digital conversion, channel compensation, and/or noise filtering of the signal.
The Signal processing circuit 102 may include a Digital Signal Processor (DSP) or the like. The connection interface 105 is used for connecting the external device 11. For example, the connection interface 105 may support various headset jack (e.g., 3.5mm headset jack) or Universal Serial Bus (USB) connection interface standards.
The connection detector 108 is connected to the signal processing circuit 102 and the connection interface 105 and is used for detecting whether the external device 11 is electrically connected to the connection interface 105. For example, when a signal transmission line plug of the external device 11 is inserted into an earphone hole of the electronic device 10, the connection detector 108 may generate a signal ON to the signal processing circuit 102 to notify the signal processing circuit 102 that the external device 11 has been electrically connected to the electronic device 10 through the connection interface 105. In other words, the signal ON reflects that the external device 11 is electrically connected to the connection interface 105. When the signal transmission line plug of the external device 11 is removed from the earphone hole of the electronic device 10, the connection detector 108 may generate a signal OFF to the signal processing circuit 102 to notify the signal processing circuit 102 that the external device 11 is electrically separated from the connection interface 105. In other words, the signal OFF indicates that the external device 11 is electrically disconnected from the connection interface 105.
The dc impedance detector 106 is connected to the signal processing circuit 102 and the connection interface 105 and is configured to detect a dc impedance of the external device 11 and transmit the signal RDC to the signal processing circuit 102. The signal RDC reflects the dc impedance of the external device 11. For example, the dc impedance detector 106 may detect the voltage and current of the external device 11 via the connection interface 105. The dc impedance detector 106 can obtain the dc impedance of the external device 11 according to the voltage and the current.
The ac impedance detector 107 is connected to the signal processing circuit 102 and the connection interface 105 and is configured to detect the ac impedance of the external device 11 and transmit the signal RAC to the signal processing circuit 102. The signal RAC reflects the ac impedance of the external device 11.
In one embodiment, the ac impedance detector 107 may send the frequency sweep signal to the external device 11 via the connection interface 105. The frequency of the frequency sweep signal varies within a predetermined frequency range (e.g., 10 Hz-10 KHz). Based on the emitted frequency sweep signal, the ac impedance detector 107 can obtain the ac impedance of the external device 11. For example, the ac impedance detector 107 may measure a plurality of impedances (also referred to as candidate ac impedances) that vary over a range of values based on the frequency change of the frequency sweep signal. Then, the ac impedance detector 107 may record the candidate ac impedances and obtain the ac impedance of the external device 11 according to the maximum value. For example, the ac impedance detector 107 may determine the maximum value of the candidate ac impedances as the ac impedance of the external device 11. In addition, the minimum value of the candidate ac impedance may be the same or approximate the dc impedance measured by the dc impedance detector 106.
Fig. 2 is a schematic diagram of ac impedance according to an embodiment of the present invention. Referring to fig. 1 and 2, after the frequency sweep signal is emitted, the impedance (i.e., the candidate ac impedance) measured by the ac impedance detector 107 varies between values 32 and 33 in response to the frequency variation of the frequency sweep signal. Where the value 33 is the maximum value of the candidate ac impedance and the value 32 is the minimum value of the candidate ac impedance, as shown in fig. 2.
In this embodiment, the ac impedance detector 107 may set the value 33 (i.e., 33 ohms) as the ac impedance of the external device 11 and notify the signal processing circuit 102 via the signal RAC. In addition, in the present embodiment, the minimum value (e.g., 32 ohms) of the candidate ac impedance may be the same as or close to the dc impedance measured by the dc impedance detector 106.
Fig. 3 is a schematic diagram of an ac impedance according to another embodiment of the present invention. Referring to fig. 1 and 3, after the frequency sweep signal is emitted, the impedance (i.e., the candidate ac impedance) measured by the ac impedance detector 107 varies between values 32 and 48 in response to the frequency variation of the frequency sweep signal. Where the value 48 is the maximum value of the candidate ac impedance and the value 32 is the minimum value of the candidate ac impedance, as shown in fig. 3.
In this embodiment, the ac impedance detector 107 may set the value 48 (i.e., 48 ohms) as the ac impedance of the external device 11 and notify the signal processing circuit 102 via the signal RAC. In addition, in the present embodiment, the minimum value (e.g., 32 ohms) of the candidate ac impedance may also be the same or close to the dc impedance measured by the dc impedance detector 106.
After determining that the external device 11 is connected to the connection interface 105 according to the signal ON, the signal processing circuit 102 may obtain a gain adjustment value according to the signal RDC and the signal RAC. The signal processing circuit 102 may instruct the gain control circuit 103 to adjust the signal gain for the signal S1 according to the gain adjustment value.
In one embodiment, the gain control circuit 103 is also referred to as a headphone gain controller. The gain control circuit 103 is connected to the audio input circuit 101 and the signal processing circuit 102. The gain control circuit 103 is configured to perform gain compensation on the signal S1 passing through the audio input circuit 101 using a corresponding gain adjustment value according to an instruction of the signal processing circuit 102. Then, the driving circuit 104 may generate a signal S2 according to the output of the gain control circuit 103 and provide the signal S2 to the external device 11 via the connection interface 105. The external device 11 may perform an audio playing operation to output sound (e.g., music) according to the signal S2.
In one embodiment, the electronic device 10 further comprises a noise canceller 109. The noise canceller 109 is connected to the signal processing circuit 102 and the driving circuit 104. The noise canceller 109 may generate a noise cancellation signal according to an instruction of the signal processing circuit 102. The driving circuit 104 may reduce a noise component (e.g., background noise or noise-induced noise) in the signal S2 according to the noise cancellation signal.
In one embodiment, the maximum value of the candidate ac impedance (and/or the difference between the maximum value and the minimum value of the candidate ac impedance) is positively correlated to the sensitivity of the speaker of the external device 11. That is, the higher the sensitivity of the speaker of the external device 11 is, the more easily the volume of the sound output from the external device 11 increases. Conversely, the lower the sensitivity of the speaker of the external device 11, the less likely the volume of the sound output by the external device 11 increases.
Taking fig. 2 and fig. 3 as an example, the maximum value (i.e., 48 ohms) of the candidate ac impedance in the embodiment of fig. 3 is greater than the maximum value (i.e., 33 ohms) of the candidate ac impedance in the embodiment of fig. 2, and/or the difference R2 (i.e., 16 ohms) between the maximum value and the minimum value of the candidate ac impedance in the embodiment of fig. 3 is greater than the difference R1 (i.e., 1 ohm) between the maximum value and the minimum value of the candidate ac impedance in the embodiment of fig. 2, which indicates that the sensitivity of the speaker of the external device 11 in the embodiment of fig. 3 may be higher than the sensitivity of the speaker of the. Therefore, if the signal gain for the signal S1 in the embodiment of fig. 3 is smaller than the signal gain for the signal S1 in the embodiment of fig. 2, the audio playing quality of the external device 11 can be improved.
In an embodiment, the signal processing circuit 102 may obtain the gain adjustment value according to a difference between an ac impedance of the external device 11 and a dc impedance of the external device 11. For example, in the embodiment of fig. 2, the signal processing circuit 102 may determine a gain adjustment value (also referred to as a first gain adjustment value) according to the difference R1 and instruct the gain control circuit 103 to perform gain compensation on the signal S1 according to the first gain adjustment value; in the embodiment of fig. 3, the signal processing circuit 102 may determine another gain adjustment value (also referred to as a second gain adjustment value) according to the difference R2 and instruct the gain control circuit 103 to perform gain compensation on the signal S1 according to the second gain adjustment value. The second gain adjustment value is less than the first gain adjustment value. Therefore, the signal gain for the signal S1 in the embodiment of fig. 3 can be smaller than the signal gain for the signal S1 in the embodiment of fig. 2, so as to improve the audio playing quality of the external device 11.
In an embodiment, the signal processing circuit 102 may determine an initial gain adjustment value according to the dc impedance of the external device 11. For example, the signal processing circuit 102 may obtain an initial gain adjustment value according to equation (1) below.
In equation (1), the parameter G represents the initial gain adjustment value, the parameter Rhs represents the preset impedance, the parameter Rhs1 represents the dc impedance of the newly connected external device 11, and Z represents the series impedance on the line.
In an embodiment, the signal processing circuit 102 may adjust the initial gain adjustment value according to a difference between an ac impedance of the external device 11 and a dc impedance of the external device 11 to obtain the gain adjustment value. For example, the signal processing circuit 102 may determine whether a difference between the ac impedance of the external device 11 and the dc impedance of the external device 11 is greater than a threshold value. If the difference is not greater than the threshold, the signal processing circuit 102 may instruct the gain control circuit 103 to perform gain compensation on the signal S1 directly according to the initial gain adjustment value. However, if the difference is greater than the threshold value (indicating that the sensitivity of the external device 11 is high), the signal processing circuit 102 may generate a trimming value and adjust the initial gain adjustment value according to the trimming value to obtain the gain adjustment value. For example, after generating the trim value, the signal processing circuit 102 may subtract the trim value from the initial gain adjustment value to obtain the gain adjustment value to reduce the gain compensation for the signal S1. Then, the signal processing circuit 102 may instruct the gain control circuit 103 to perform gain compensation on the signal S1 according to the adjusted gain adjustment value.
In the following, fig. 2 and fig. 3 are taken as examples for explanation, and it is assumed that the threshold value is 8. In the embodiment of fig. 2, the difference R1 (i.e., 1) is smaller than the threshold (i.e., 8), so the signal processing circuit 102 can instruct the gain control circuit 103 to perform gain compensation on the signal S1 directly according to the initial gain adjustment value, and the initial gain adjustment value may not be trimmed. However, in the embodiment of fig. 3, the difference R2 (i.e. 16) is greater than the threshold value (i.e. 8), so the signal processing circuit 102 may first subtract a trimming value from the initial gain adjustment value to obtain the gain adjustment value. Then, the signal processing circuit 102 may instruct to perform gain compensation on the signal S1 according to the adjusted gain adjustment value. Therefore, no matter the currently connected external device 11 is a high-sensitivity or low-sensitivity audio playing device, the signal processing circuit 102 can dynamically determine an appropriate gain adjustment value to perform gain compensation on the audio signal output to the external device 11, so that the audio playing quality of the external device is kept good and stable.
In an embodiment, the signal processing circuit 102 may further adjust the output voltage range of the signal S2 according to the dc impedance of the external device 11. For example, after obtaining the dc impedance of the external device 11, the signal processing circuit 102 may query a voltage interval table according to the dc impedance. For example, the voltage interval table can record output voltage intervals corresponding to a plurality of dc impedances. According to the voltage interval table, the signal processing circuit 102 can obtain the output voltage interval corresponding to the dc impedance of the external device 11. If the currently detected voltage is different from the output voltage interval, the signal processing circuit 102 may adjust the voltage of the signal S2 to the output voltage interval via the gain control circuit 103 and the driving circuit 104. Otherwise, if the previously detected voltage meets the output voltage interval, the voltage of the signal S2 may not be adjusted.
Fig. 4 is a flowchart illustrating a signal gain control method according to an embodiment of the present invention. Referring to fig. 4, in step S401, the ac impedance detector detects the ac impedance of the external device. In step S402, the dc impedance of the external device is detected by the dc impedance detector. In step S403, a gain adjustment value is obtained according to the ac impedance and the dc impedance. In step S404, a signal gain of an output signal (i.e., an audio signal) output to the external device is adjusted according to the gain adjustment value.
Fig. 5 is a flowchart illustrating a signal gain control method according to an embodiment of the present invention. Referring to fig. 5, in step S501, the external device is connected via the connection interface. In step S502, the voltage and the current are detected via the connection interface. In step S503, the dc impedance of the external device is obtained according to the detected voltage and current. In step S504, it is determined whether to adjust the output voltage interval of the signal according to the dc impedance of the external device. If the output voltage interval of the signal needs to be adjusted, in step S505, the output voltage interval of the signal is adjusted. If the output voltage interval of the signal is not required to be adjusted, in step S506, a gain adjustment value (i.e., an initial gain adjustment value) is obtained according to the dc impedance.
On the other hand, in step S507, a frequency sweeping signal is sent, and the frequency of the frequency sweeping signal is changed within a predetermined frequency range. In step S508, the ac impedance of the external device is obtained according to the frequency sweep signal. In step S509, it is determined whether the difference between the dc impedance and the ac impedance is greater than a threshold value. If the difference between the dc impedance and the ac impedance is greater than the threshold value, in step S510, the gain adjustment value is adjusted. For example, the initial gain adjustment value is decreased. If the difference between the dc impedance and the ac impedance is not greater than the threshold, step S511 is directly performed. In step S511, the audio signal is adjusted according to the (adjusted) gain adjustment value.
It should be noted that the steps in fig. 4 and fig. 5 have been described in detail above, and are not repeated herein. The steps in fig. 4 and fig. 5 can be implemented as a plurality of program codes or circuits, and the invention is not limited thereto. In addition, the methods of fig. 4 and fig. 5 can be used with the above exemplary embodiments, or can be used alone, and the invention is not limited thereto.
In summary, in the embodiments of the invention, after detecting the ac impedance and the dc impedance of the external device, a gain adjustment value can be obtained according to the ac impedance and the dc impedance. Then, the gain adjustment value can be used to adjust the signal gain of the output signal output to the external device. Particularly, after considering the ac impedance of the external device, no matter the currently connected external device is a high-sensitivity or low-sensitivity audio playing device, the embodiment of the present invention can dynamically determine an appropriate gain adjustment value to perform gain compensation on the audio signal output to the external device, so as to maintain the audio playing quality of the external device to be good and stable.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (11)
1. A signal gain control method is applied to an electronic device, wherein the electronic device comprises an alternating current impedance detector and a direct current impedance detector, the electronic device is connected to an external device, and the signal gain control method comprises the following steps:
detecting the AC impedance of the external device by the AC impedance detector;
detecting the DC impedance of the external device by the DC impedance detector;
obtaining a gain adjustment value according to the alternating current impedance and the direct current impedance; and
and adjusting the signal gain of the audio signal output to the external device according to the gain adjustment value.
2. The signal gain control method according to claim 1, wherein the step of detecting the ac impedance of the external device by the ac impedance detector includes:
transmitting a frequency sweep signal, wherein the frequency of the frequency sweep signal varies over a frequency range;
measuring a plurality of candidate alternating-current impedances corresponding to the external device according to the frequency change of the sweep frequency signal; and
obtaining the alternating-current impedance according to the maximum value of the candidate alternating-current impedances.
3. The signal gain control method of claim 1, wherein the step of obtaining the gain adjustment value according to the ac impedance and the dc impedance comprises:
and obtaining the gain adjustment value according to the difference value between the alternating current impedance and the direct current impedance.
4. The signal gain control method of claim 3, wherein the step of obtaining the gain adjustment value according to the difference between the alternating current impedance and the direct current impedance comprises:
obtaining an initial gain adjustment value according to the direct current impedance; and
and obtaining the gain adjustment value according to the initial gain adjustment value and the difference value.
5. The signal gain control method of claim 1, wherein the step of obtaining the gain adjustment value according to the ac impedance and the dc impedance comprises:
and adjusting the output voltage interval of the output signal according to the direct current impedance.
6. An electronic device, connected to an external device, the electronic device comprising:
the alternating current impedance detector is used for detecting the alternating current impedance of the external device;
the direct current impedance detector is used for detecting the direct current impedance of the external device;
a signal processing circuit connected to the ac impedance detector and the dc impedance detector and configured to obtain a gain adjustment value according to the ac impedance and the dc impedance; and
and the gain control circuit is connected to the signal processing circuit and is used for adjusting the signal gain of the audio signal output to the external device according to the gain adjustment value.
7. The electronic device of claim 6, wherein the operation of the ac impedance detector detecting the ac impedance of the external device comprises:
transmitting a frequency sweep signal, wherein the frequency of the frequency sweep signal varies over a frequency range;
measuring a plurality of candidate alternating-current impedances corresponding to the external device according to the frequency change of the sweep frequency signal; and
obtaining the alternating-current impedance according to the maximum value of the candidate alternating-current impedances.
8. The electronic device of claim 6, wherein the operation of the signal processing circuitry to obtain the gain adjustment value from the alternating current impedance and the direct current impedance comprises:
and obtaining the gain adjustment value according to the difference value between the alternating current impedance and the direct current impedance.
9. The electronic device of claim 8, wherein the operation of the signal processing circuitry to obtain the gain adjustment value from the difference between the alternating current impedance and the direct current impedance comprises:
obtaining an initial gain adjustment value according to the direct current impedance; and
and obtaining the gain adjustment value according to the initial gain adjustment value and the difference value.
10. The electronic device of claim 6, wherein the operation of the signal processing circuitry to obtain the gain adjustment value from the alternating current impedance and the direct current impedance comprises:
and adjusting the output voltage interval of the output signal according to the direct current impedance.
11. The electronic device of claim 6, wherein the external device is an audio playback device to play back the audio signal.
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