CN111200774A - Bluetooth sound card - Google Patents
Bluetooth sound card Download PDFInfo
- Publication number
- CN111200774A CN111200774A CN201811371208.9A CN201811371208A CN111200774A CN 111200774 A CN111200774 A CN 111200774A CN 201811371208 A CN201811371208 A CN 201811371208A CN 111200774 A CN111200774 A CN 111200774A
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- bluetooth
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- mobile terminal
- interface
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- 230000005236 sound signal Effects 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Classifications
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention provides a Bluetooth sound card, which is characterized in that a plurality of wired I/O interfaces are arranged on the sound card, and sound signals are interconnected and intercommunicated through bidirectional stereo Bluetooth connection between the sound card and a mobile terminal, so that the function of a wireless sound card is realized, and more convenient and reliable support is provided for sound creation based on the mobile terminal.
Description
Technical Field
The invention belongs to the field of audio frequency, and particularly relates to a Bluetooth sound card.
Background
Sound Card (Sound Card) is the most basic component in multimedia technology, and is a hardware for realizing the interconversion of analog/digital Sound signals; the sound card can acquire a sound analog signal from a microphone, sample and convert a sound wave amplitude signal into a series of digital signals through an analog-to-digital converter (ADC), and store the digital signals into a computer; during reproduction, the digital signals are sent to a digital-to-analog converter (DAC), restored to analog waveforms at the same sampling speed, amplified and sent to a loudspeaker for sounding.
The sound card in the prior art is generally in a wired connection mode, and is integrated in a computer or serves as an external device, and with the continuous enhancement of the performance of mobile terminals such as mobile phones and tablet computers, various sound application programs are rich, although some external sound card devices for the mobile terminals are already available, the sound card device still only can be in a wired connection mode, which often causes inconvenience in use and is difficult to meet requirements in function.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the Bluetooth sound card, which realizes the function of a wireless sound card by arranging a plurality of wired I/O interfaces on the sound card and performing interconnection and intercommunication of sound signals through bidirectional stereo Bluetooth connection between the sound card and a mobile terminal, and provides more convenient and reliable support for sound creation based on the mobile terminal.
A Bluetooth sound card is provided, which comprises at least one I/O interface used for sound signal input and sound signal output; the system comprises an I/O control module, a storage module and a control module, wherein the I/O control module is connected with I/O interfaces and is used for automatically identifying the input/output types of sound equipment inserted into each I/O interface, and simultaneously, the I/O control module also performs A/D conversion on input signals or D/A conversion processing on output signals; characterized in that the mobile terminal further comprises a Bluetooth audio receiving/transmitting module which is in Bluetooth wireless connection with the mobile terminal and is used for receiving stereo audio input signals from the mobile terminal and transmitting the stereo audio output signals to the mobile terminal; the system further comprises a DSP (digital signal processor), wherein the DSP is connected with the I/O control module and the Bluetooth audio receiving/transmitting module, receives input signals from the I/O control module and the Bluetooth audio receiving/transmitting module, performs sound effect processing on each path of input signals and performs sound mixing, namely, stereo input signals from the mobile terminal and input signals from each I/O interface are mixed to obtain mixed sound signals; further, the DSP sends the mixed sound signal to the I/O control module and the Bluetooth audio receiving/sending module, the I/O control module carries out D/A conversion on the mixed sound signal and then feeds the converted mixed sound signal to equipment with a sound receiving function inserted into the I/O interface, the Bluetooth audio receiving/sending module sends the mixed sound signal to the mobile terminal, and the mobile terminal carries out subsequent processing; the sound card also comprises a power supply module used for supplying power to all the parts of the sound card; further, the I/O interface comprises a four-section type 3.5mm interface.
Another bluetooth sound card is proposed, which is different from the first solution in that the input and output interfaces on the sound card are separately provided.
The Bluetooth sound card further comprises a USB interface, wherein the USB interface is connected with the power supply module and the DSP and used for charging the power supply module or is in wired connection with a computer with the USB interface, so that the Bluetooth sound card is used as a wired sound card to communicate with the computer; the Bluetooth sound card further comprises a plurality of keys or knobs for controlling the I/O control module and correspondingly controlling the sound effect processing and sound mixing functions of the DSP; the mobile terminal is provided with an APP matched with the Bluetooth sound card for use, and the Bluetooth sound card can be controlled through a Bluetooth protocol; the downlink stereo audio transmission between the Bluetooth sound card and the mobile terminal adopts an A2DP protocol, and the uplink stereo audio transmission adopts an RFCOMM protocol.
The mobile terminal comprises a mobile phone, a tablet computer, a laptop computer or other equipment with a Bluetooth function.
Drawings
FIG. 1 is a schematic diagram of the internal structure and operation principle of a Bluetooth sound card according to a first embodiment of the present invention
FIG. 2 is a schematic diagram of the internal structure and operation principle of a Bluetooth sound card according to a second embodiment of the present invention
Detailed Description
A first embodiment of the bluetooth sound card of the present invention will be described in detail with reference to fig. 1. The Bluetooth sound card 1 comprises I (I ≧ 1) I/O (input/output) interfaces 11, i.e. the I/O interfaces can be used for both sound signal input and sound signal output, wherein the input signal is denoted as S1～Si(ii) a Further comprises an I/O control module 12, which is connected to the I/O interface 11, for automatically recognizing the input/output type of the sound device 3 inserted into each I/O interface, i.e. whether the input device, the output device or the device with both input and output, and whether the device is a mono device or a stereo device, such as determining whether the device is a mono microphone, a stereo microphone, or an earphone, a sound box, a microphone earphone, or other sound devices (e.g. CD player, recorder, etc.), the specific determination method can be performed by measuring the input and output impedance between the pins of the plug of the access device, these technical means belong to the prior art, and are not described again, and at the same time, the I/O control module 12 also performs a/D conversion on the input signal or performs a D/a conversion on the output signal; further comprises a bluetooth audio transceiver module 13 having a bluetooth wireless connection with the mobile terminal 2 for receiving a stereo audio input signal S from the mobile terminal 20Or sending the stereo audio output signal to the mobile terminal 2; further comprises a DSP14 connected with the I/O control module 12 and the Bluetooth audio receiving/transmitting module 13 for receiving the audio signal fromThe audio input signals of the I/O control module 12 and the bluetooth audio transceiver module 13 perform sound effect processing and audio mixing on each input signal, i.e., the stereo input signal S from the mobile terminal 20With input signals S from the I/O interface 111～SiMixing to obtain a mixed sound signal Mix; further, the DSP14 sends the mixed sound signal Mix to the I/O control module 12 and the bluetooth audio receiving/sending module 13, on one hand, the I/O control module 12 performs D/a conversion on the mixed sound signal Mix and then feeds the converted mixed sound signal to a device with a sound receiving function, such as a sound box, an earphone or a microphone earphone, which is inserted into the I/O interface 11, on the other hand, the bluetooth audio receiving/sending module 13 sends the mixed sound signal Mix to the mobile terminal 2, and the mobile terminal 2 performs subsequent processing; the sound card 1 further comprises a power supply module 16 for supplying power to the various components of the sound card.
The I/O interface 11 may be a four-section 3.5mm interface, and particularly, when the access device is a microphone headset, the I/O interface 11 may simultaneously receive an input signal from the microphone headset and transmit a mixed signal Mix to the microphone headset for monitoring.
Further, the bluetooth sound card 1 further comprises a USB interface 15, which is connected with the power supply module 16 and the DSP14, and is used for charging the power supply module 16, or is in wired connection with a computer having a USB interface, so that the bluetooth sound card 1 is used as a wired sound card to communicate with the computer at the same time; the Bluetooth sound card 1 further comprises a plurality of keys or knobs 16 for controlling the I/O control module 12 and correspondingly controlling the sound effect processing and mixing functions of the DSP 14; further, the mobile terminal 2 is provided with an APP used in cooperation with the Bluetooth sound card 1, and the Bluetooth sound card 1 can be controlled through a Bluetooth protocol; the downlink stereo audio transmission between the Bluetooth sound card 1 and the mobile terminal 2 can adopt an A2DP protocol, and the uplink stereo audio transmission adopts an RFCOMM protocol; the mobile terminal 2 may be a bluetooth enabled device such as a mobile phone, a tablet computer, a laptop computer, etc.
The second embodiment of the present invention is different from the first embodiment in that the input and output interfaces of the sound card are separately arranged, that is, the bluetooth sound card 1 includes i (i ≧ 1) input interfacesAt port 11, the input signal is denoted as S1～Si(ii) a Also comprises at least one output interface 11'; the system further comprises an I/O control module 12, which is connected with the input interface 11 and the output interface 11 'and is used for judging the channel type of the sound equipment 3 (3') inserted into each input or output interface, wherein the specific judging method belongs to the prior art and is not described again, and meanwhile, the I/O control module 12 also performs A/D conversion on input signals or D/A conversion processing on output signals; further comprises a bluetooth audio transceiver module 13 having a bluetooth wireless connection with the mobile terminal 2 for receiving a stereo audio input signal S from the mobile terminal 20Or sending the stereo audio output signal to the mobile terminal 2; further comprises a DSP14 connected to the I/O control module 12 and the Bluetooth audio receiving/transmitting module 13 for receiving the audio input signals from the I/O control module 12 and the Bluetooth audio receiving/transmitting module 13, and performing sound effect processing and mixing on each input signal, i.e. the stereo input signal S from the mobile terminal 20With input signals S from the input interface 111～SiMixing to obtain a mixed sound signal Mix; further, the DSP14 sends the mixed sound signal Mix to the I/O control module 12 and the bluetooth audio receiving/sending module 13, on one hand, the I/O control module 12 performs D/a conversion on the mixed sound signal Mix and then feeds the converted mixed sound signal to a device with a sound receiving function, such as a sound box, an earphone or a microphone earphone, which is inserted into the output interface 11', on the other hand, the bluetooth audio receiving/sending module 13 sends the mixed sound signal Mix to the mobile terminal 2, and the mobile terminal 2 performs subsequent processing; the sound card 1 further comprises a power supply module 16 for supplying power to the various components of the sound card.
In particular, the input interface 11 and the output interface 11' may be configured as an XLR cannon interface, in addition to a 3.5mm four-segment interface.
Claims (9)
1. A bluetooth sound card comprising at least one I/O interface (11) for acoustic signal input and acoustic signal output; the system comprises an I/O control module (12), an I/O interface and a control module, wherein the I/O control module (12) is connected with the I/O interface and is used for automatically identifying the input/output type of the sound equipment (3) inserted into each I/O interface, and meanwhile, the I/O control module (12) also carries out A/D conversion on input signals or carries out D/A conversion processing on output signals; characterized in that the mobile terminal further comprises a Bluetooth audio receiving/transmitting module (13) which is in Bluetooth wireless connection with the mobile terminal (2) and is used for receiving a stereo audio input signal from the mobile terminal (2) and transmitting a stereo audio output signal to the mobile terminal (2); the mobile terminal further comprises a DSP (14) which is connected with the I/O control module (12) and the Bluetooth audio receiving/transmitting module (13), receives input signals from the I/O control module (12) and the Bluetooth audio receiving/transmitting module (13), performs sound effect processing on each path of input signals and performs sound mixing, wherein the sound mixing is to mix stereo input signals from the mobile terminal (2) and input signals from each I/O interface (11) to obtain mixed sound signals; further, the DSP (14) sends the mixed sound signal to the I/O control module (12) and the Bluetooth audio receiving/sending module (13), the I/O control module (12) carries out D/A conversion on the mixed sound signal and then feeds the converted mixed sound signal to equipment with a sound receiving function inserted into the I/O interface (11), the Bluetooth audio receiving/sending module (13) sends the mixed sound signal to the mobile terminal (2), and the mobile terminal (2) carries out subsequent processing; the sound card (1) further comprises a power supply module (16) for supplying power to all parts of the sound card.
2. The bluetooth sound card according to claim 1, characterized in that the I/O interface (11) comprises a four-segment 3.5mm interface.
3. A bluetooth sound card comprising at least one input interface (11) for acoustic signal input, comprising at least one output interface (11') for acoustic signal output; the system comprises an I/O control module (12), an I/O control module and a control module, wherein the I/O control module (12) is respectively connected with an input interface (11) and an output interface (11 ') and is used for automatically identifying the channel types of sound equipment (3, 3 ') inserted into each input interface 11 and each output interface 11 ', and simultaneously, the I/O control module (12) also carries out A/D conversion on input signals or carries out D/A conversion processing on output signals; characterized in that the mobile terminal further comprises a Bluetooth audio receiving/transmitting module (13) which is in Bluetooth wireless connection with the mobile terminal (2) and is used for receiving a stereo audio input signal from the mobile terminal (2) and transmitting a stereo audio output signal to the mobile terminal (2); the mobile terminal further comprises a DSP (14) which is connected with the I/O control module (12) and the Bluetooth audio receiving/transmitting module (13), receives input signals from the I/O control module (12) and the Bluetooth audio receiving/transmitting module (13), performs sound effect processing on each path of input signals and performs sound mixing, wherein the sound mixing is to mix stereo input signals from the mobile terminal (2) and input signals from each input interface (11) to obtain mixed sound signals; further, the DSP (14) sends the mixed sound signal to the I/O control module (12) and the Bluetooth audio receiving/sending module (13), the I/O control module (12) carries out D/A conversion on the mixed sound signal and then feeds the converted mixed sound signal to equipment with a sound receiving function inserted into the output interface (11'), the Bluetooth audio receiving/sending module (13) sends the mixed sound signal to the mobile terminal (2), and the mobile terminal (2) carries out subsequent processing; the sound card (1) further comprises a power supply module (16) for supplying power to all parts of the sound card.
4. Bluetooth sound card according to claim 3, characterized in that said input interface (11) or output interface (11') comprises a four-section 3.5mm interface or an XLR Canon interface.
5. The bluetooth sound card according to one of claims 1, 3, characterized in that the bluetooth sound card (1) further comprises a USB interface (15) connected to the power supply module (16) and the DSP (14) for charging the power supply module (16) or wired to a computer with a USB interface, so that the bluetooth sound card (1) can communicate with the computer as a wired sound card at the same time.
6. The bluetooth sound card according to one of claims 1 and 3, characterized in that the bluetooth sound card (1) further comprises a plurality of buttons or knobs (16) for operating the I/O control module (12) and controlling the sound processing and mixing functions of the DSP (14) accordingly.
7. Bluetooth sound card according to one of claims 1, 3, characterized in that the mobile terminal (2) is equipped with an APP adapted to the Bluetooth sound card (1), and the Bluetooth sound card (1) can be controlled by the Bluetooth protocol.
8. Bluetooth sound card according to one of claims 1, 3, characterized in that the downstream stereo audio transmission between the Bluetooth sound card (1) and the mobile terminal (2) uses the A2DP protocol and the upstream stereo audio transmission uses the RFCOMM protocol.
9. The bluetooth sound card according to one of the claims 1, 3, characterized in that the mobile terminal (2) comprises a mobile phone, a tablet computer, a laptop computer or other bluetooth enabled devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811371208.9A CN111200774A (en) | 2018-11-18 | 2018-11-18 | Bluetooth sound card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811371208.9A CN111200774A (en) | 2018-11-18 | 2018-11-18 | Bluetooth sound card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111200774A true CN111200774A (en) | 2020-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811371208.9A Withdrawn CN111200774A (en) | 2018-11-18 | 2018-11-18 | Bluetooth sound card |
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| Country | Link |
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| CN (1) | CN111200774A (en) |
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Application publication date: 20200526 |