CN106488044B - Mobile phone and system for mobile sound card and implementation method - Google Patents
Mobile phone and system for mobile sound card and implementation method Download PDFInfo
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- CN106488044B CN106488044B CN201611193131.1A CN201611193131A CN106488044B CN 106488044 B CN106488044 B CN 106488044B CN 201611193131 A CN201611193131 A CN 201611193131A CN 106488044 B CN106488044 B CN 106488044B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
- H04M1/72409—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
- H04M1/72442—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality for playing music files
Abstract
The invention discloses a mobile phone, a system and a realization method of a mobile sound card, wherein the mobile phone comprises: the system comprises USB OTG equipment, a USB unpacking unit, a mobile phone application processor, a selector, a high-fidelity lossless DAC and an earphone operational amplifier; the USB OTG equipment is connected with the USB unpacking unit and the mobile phone application processor; the USB unpacking unit and the mobile phone application processor are respectively connected with the selector; the selector, the high-fidelity lossless DAC and the earphone operational amplifier are sequentially connected; when detecting that the equipment is connected, the USB OTG equipment identifies the master equipment and the slave equipment of the mobile phone; and the application processor calls different equipment type ID numbers according to the identification result and carries out corresponding operation. The high-fidelity music output function is expanded through the design of mobile phone hardware, so that the music quality is improved and different styles of high-fidelity lossless tone qualities can be selected relative to original broadcasting equipment through a processing module of the earphone.
Description
Technical Field
The invention relates to the field of electronic equipment, in particular to a mobile phone and a system for moving a sound card and an implementation method.
Background
Nowadays, portable mobile terminals such as mobile phones and the like have higher and higher popularity, functions attached to consumer electronics in the mobile terminals widely cover aspects of life, and multimedia functions are applications used by consumer electronics users most, and the effect of improving the multimedia functions in the consumer electronics is a problem that each manufacturer needs to consider.
Audio and video is a system design, and various indexes of audio test are improved by system engineering with very complicated rear end design, at present, a plurality of manufacturers only use better devices on the basis of the products, and spend higher-cost accessories to improve listening experience and tone quality.
The cost of improving the effect of audio and video is too high in the prior art.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a mobile phone, a system and an implementation method for a mobile sound card, aiming at the above defects in the prior art, and by designing and expanding a mobile phone with high fidelity music output by mobile phone hardware, the technical problem of high cost for improving audio and video effects in the prior art is solved.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a mobile phone for moving a sound card, comprising: the system comprises USB OTG equipment, a USB unpacking unit, a mobile phone application processor, a selector, a high-fidelity lossless DAC and an earphone operational amplifier;
the USB OTG equipment is connected with the USB unpacking unit and the mobile phone application processor; the USB unpacking unit and the mobile phone application processor are respectively connected with the selector; the selector, the high-fidelity lossless DAC and the earphone operational amplifier are sequentially connected;
when detecting that the equipment is connected, the USB OTG equipment identifies the master equipment and the slave equipment of the mobile phone; the application processor calls different equipment type ID numbers according to the identification result and carries out corresponding operation: when the mobile phone is the main device, the mobile phone application processor acquires the corresponding ID value and matches the corresponding functional operation; when the mobile phone is a slave device, the mobile phone application processor switches the connection configuration to the USB unpacking unit to be connected with the high-fidelity lossless DAC, inputs the digital signal unpacked by the USB unpacking unit into the high-fidelity lossless DAC to be converted into an analog signal, inputs the analog signal into the earphone operational amplifier to be subjected to power amplification, and inputs the analog signal into the earphone loudspeaker to be played.
The mobile phone with the sound card, wherein the system further comprises: a first DC-DC circuit, a second DC-DC circuit;
the first DC-DC circuit is connected with the high-fidelity lossless DAC and used for carrying out voltage reduction processing on the voltage input into the high-fidelity lossless DAC;
and the second DC-DC circuit is connected with the earphone operational amplifier and is used for carrying out voltage reduction processing on the voltage input to the earphone operational amplifier.
The mobile phone with the mobile sound card is characterized in that the USB OTG equipment identifies the mobile phone owner and the mobile phone slave equipment: when the grounding of the ID pin of the equipment is detected, the equipment is the main equipment; when the ID pin of the device is detected to be floating, the device is a slave device.
And the USB unpacking unit is used for removing USB protocol related protocol information and restoring the USB unpacking unit into transmitted pure PCM and DSD data.
The mobile sound card handset, wherein the device class ID number defines an interface descriptor for the device.
In the mobile phone with the mobile sound card, if one equipment type is the whole equipment, the equipment type ID number is stored in the equipment type value field of the interface descriptor; if a device type is an interface of the device, the device type ID number is stored in the interface class value field of the interface descriptor.
A system for moving a sound card, comprising: a public address device, a handset of a mobile sound card according to claims 1-6; the broadcasting equipment is connected with a mobile phone of the mobile sound card through a USB line.
A method for realizing a mobile phone with a mobile sound card comprises the following steps:
step A, when the connection of equipment is detected, the USBOTG equipment identifies the master equipment and the slave equipment of the mobile phone;
and step B, the application processor calls different equipment type ID numbers according to the identification result and carries out corresponding operation.
The implementation method of the mobile phone with the mobile sound card comprises the following specific steps:
b11, when the mobile phone is the main device, the mobile phone application processor obtains the corresponding ID value and matches the corresponding function operation;
and B12, when the mobile phone is a slave device, the mobile phone application processor switches the connection configuration to a USB unpacking unit to be connected with the high-fidelity lossless DAC, and the input digital audio signal is decoded, amplified in power and then played.
The implementation method of the mobile phone with the sound card, wherein the step B12 specifically includes:
b121, inputting the digital signal unpacked by the USB unpacking unit into a high-fidelity lossless DAC to be converted into an analog signal;
b122, inputting the analog signal into an earphone operational amplifier for power amplification;
and B123, inputting the analog signal output by the earphone operational amplifier into an earphone loudspeaker for playing.
The invention provides a mobile phone, a system and an implementation method of a mobile sound card, wherein a lossless high-fidelity DAC device and a high-quality ear amplifier or a high-quality ear amplifier are selected to be placed in a multimedia terminal device, which is equivalent to an external high-fidelity USB sound card, and the mobile phone has great advantages in portability; the mobile phone hardware is designed to expand the mobile phone effect of high-fidelity music output, so that the processing module of the earphone is used for improving the music quality relative to the original broadcasting equipment and selecting high-fidelity lossless tone qualities with different styles.
Drawings
Fig. 1 is a block diagram of a mobile phone with a mobile sound card according to the present invention.
Fig. 2 is a diagram showing the correspondence between the types of the general-purpose devices and the ID numbers according to the present invention.
Fig. 3 is a block diagram of the structure of the system of the mobile sound card of the present invention.
Fig. 4 is a flow chart of the method for implementing the mobile phone with the mobile sound card.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention expands the mobile phone function of high-fidelity music input by designing mobile phone hardware, sends audio output signals into the mobile phone through the USB interface, processes and outputs and plays the audio output signals through the high-fidelity module in the mobile phone, and realizes the improvement of music quality.
As shown in fig. 1, which is a block diagram of a mobile phone with a mobile sound card, according to the present invention, the mobile phone 20 includes: the system comprises USB OTG equipment 201, a USB unpacking unit 202, a mobile phone application processor 203, a selector 204, a high-fidelity lossless DAC205 and an earphone operational amplifier 206;
the USB OTG device 201 is connected to the USB unpacking unit 202 and the mobile phone application processor 203. The USB OTG device 201 is a dual-purpose OTG, allowing the device to be a master device or a slave device, and in the OTG standard, the device may be determined to be the master device or the slave device by a connection manner of a cable. OTG (On-The-Go), which is a technology for realizing data transmission between devices without a host. When the USB OTG device 201 detects that the ID pin of the device is grounded, the device is a master device; when the USB OTG device 201 detects that the ID pin of the device is empty, the device is a slave device. The USB OTG device 201 has a power management function on the basis of being completely compatible with the USB2.0 standard, and can provide a certain detection capability of the host device and support a signaling protocol and a session request protocol of the host device. The USB OTG device 201 of the present invention is used to identify a master device and a slave device of the mobile phone 20.
The USB unpacking unit 202 and the mobile phone application processor 203 are respectively connected with the selector 204, and the selector 204, the high-fidelity lossless DAC205 and the earphone operational amplifier 206 are sequentially connected. The selector 204 performs switching selection of the inter-module connection relationship: when the device type ID number is the ID number of the main device, connecting the high-fidelity lossless DAC205 with the mobile phone application processor 203; when the device class ID number is the slave ID number, the high fidelity lossless DAC205 is connected to the USB unpacking unit 202. The switching operation of the selector 204 is controlled in accordance with the handset application processor 203. The mobile phone application processor 203 calls different device type ID numbers according to the identification result and performs corresponding operations: when the mobile phone is the main device, acquiring a corresponding ID value and matching corresponding functional operation; when the mobile phone is a slave device, the digital signal unpacked by the USB unpacking unit 202 is input into the high fidelity lossless DAC205 to be converted into an analog signal, and the analog signal is input into the earphone operational amplifier 206 to be power amplified and input into the earphone speaker 30 to be played. Dac (digital to analog converter) is a digital-to-analog converter that converts a digital signal into an analog signal.
The devices attached to the bus may be fully customized devices that require specific drivers, or may belong to a class of devices. The device type defines an interface descriptor of the corresponding device, is determined by a USB design Forum device working group, and is allocated with an ID number. A common operating system provides a generic driver for supporting the operation of a device, i.e., one driver can be used for all such device classes.
The addresses held by the device class ID numbers are not the same. If one equipment type is the whole equipment, the equipment type ID number is stored in an equipment type value field of the interface descriptor; if a device type is an interface of the device, the device type ID number is stored in the interface class value field of the interface descriptor. They all occupy one byte and there are a maximum of 253 device classes. Each device class may optionally support subcategories and protocol sub-definitions for ongoing revisions of device types.
As shown in fig. 2, it is a diagram of correspondence between the types of the commonly used devices and the ID numbers. One device class may correspond to multiple devices, for example, the device class is a mass access device with a corresponding ID number of 0x08, and the corresponding device may be a usb disk, a removable hard drive, a memory card reader, or a digital camera. The ID number 0x00 indicates no device, and when the device class value field of the interface descriptor holds a device class ID number of 0x00, the operating system further checks the ID number of the interface class value of each interface to determine its device class.
The audio digital signal transmitted to the earphone is carried by USB, the master device and the slave device are connected through a USB interface, and the audio digital signal can be smoothly transmitted to the slave device from the master device only after being encrypted into a data packet according to a USB protocol. The audio digital signal is input to the slave device, the encrypted data packet needs to be decrypted, the data related to the USB protocol encrypted in the master device before being removed is restored to the transmitted pure PCM and DSD data, the function is realized by the USB unpacking unit 202, and the USB unpacking unit 202 supports PCM and DSD data full-sampling rate unpacking. In addition, the USB unpacking unit 202 directly supports the USB interface of the USB2.0 standard and supports the ingress and egress of two I2S interfaces, thereby ensuring that the high-speed data transmission is not lost. PCM (pulse Code modulation) is pulse Code modulation, and DSD (direct Stream digital) is direct bitstream digital encoding.
When the device class ID number is the slave ID number, the high fidelity lossless DAC205 is connected to the USB unpacking unit 202. The high-fidelity lossless DAC205 converts pure PCM data from digital signals to analog signals through a high-precision digital converter, and can furthest losslessly restore the digital audio digital signals to analog signals before codingThe number is input into the rear end earphone operational amplifier. Preferably, the sampling rate can reach 384kbps at the most, and the sampling bit number is 24bit precision. Currently, the high fidelity lossless DAC205 supports data with a maximum sampling bit number of 32 bits or less, and supports audio data that can be decoded at present to the maximum extent. In performance, the dynamic range of the high fidelity lossless DAC205 reaches 127dB, and the total distortion can reach-120 dB. After passing through the high-fidelity lossless DAC205, analog signals are required to be input into the earphone operational amplifier 206 for amplification, corresponding parameters of the earphone operational amplifier 206 are matched, the signal-to-noise ratio of the earphone operational amplifier 206 is 122dB, the dynamic range is-117 dB at present, and 600 can be supported under the rated voltage of 2V
The high impedance earphone further ensures the quality of audio.
The system further comprises: a first DC-DC circuit, a second DC-DC circuit; the first DC-DC circuit is connected with the high-fidelity lossless DAC and is used for carrying out voltage reduction processing on the voltage input into the high-fidelity lossless DAC 205; the second DC-DC circuit is connected to the headphone operational amplifier 206 for performing a voltage reduction process on the voltage input to the headphone operational amplifier. Since the USB provides 5V voltage output, in order to cooperate with each module to work normally, the voltage is reduced through a DC-DC circuit. For example, if the voltage of the high-fidelity lossless DAC is 3.3V, the voltage of 5V needs to be converted into 3.3V through the first DC-DC circuit. For example, if the voltage of the operational amplifier of the earphone normally works at 1.8V, the 3.3V voltage output by the high-fidelity lossless DAC needs to be converted into 1.8V voltage through the second DC-DC circuit. DC-DC is a device that changes the electrical energy of one voltage value to the electrical energy of another voltage value in a direct current circuit.
Based on the mobile phone with the sound card, the invention also provides a system for moving the sound card, as shown in fig. 3, the system comprises: broadcasting equipment 10, the mobile phone 20 of the mobile sound card and an earphone loudspeaker 30; the broadcasting equipment 10 is connected with the mobile phone 20 of the mobile sound card through a USB line, and the earphone loudspeaker 30 is connected through an earphone jack on the mobile phone 20 of the mobile sound card. The broadcasting equipment 10 is generally consumer electronics broadcasting equipment such as CD/DVD, etc., the broadcasting equipment 10 sends original PCM audio data of pure digital signals after processing such as sound effect, etc. to the mobile phone, and the mobile phone receives the signals and inputs the signals to the earphone speaker for playing after operations such as decoding, power amplification, etc.
As shown in fig. 4, the present invention further provides a flowchart of a method for implementing a mobile phone with a mobile sound card, where the steps specifically include:
when detecting that the device is connected, the USB OTG device 201 identifies the master device and the slave device of the mobile phone; the specific method for identifying the master device and the slave device through the USB OTG device 201 is as described above.
The mobile phone application processor 203 calls different device type ID numbers according to the identification result and carries out corresponding operation. The invention carries out different operations according to the identification result of the mobile phone, namely, whether the mobile phone is the master device or the slave device. When the mobile phone is a master device, the mobile phone application processor 203 acquires a corresponding ID value and matches a corresponding functional operation; when the mobile phone is a slave device, the mobile phone application processor 203 switches the connection configuration to the USB unpacking unit 202 to be connected with the high fidelity lossless DAC205, and decodes, power-amplifies and plays the input digital audio signal.
When the mobile phone is a slave device, the read ID number is written into the mobile phone application processor 203, the ID number is actively sent to the broadcasting device 10 according to the USB protocol, and the broadcasting device 10 and the mobile phone perform a handshake operation and read the device ID number at this time. The mobile phone is used as sound effect equipment of the slave equipment, and the ID number of the equipment can be acquired to be 0x01 by contrasting the corresponding table of the types of the common equipment and the ID numbers. When the device ID number of the mobile phone is read, the connection configuration of the high-fidelity lossless DAC205 and the mobile phone application processor 203 is switched to the connection configuration of the USB unpacking unit 202 and the high-fidelity lossless DAC 205. At this time, the path of the mobile phone is switched, and the music signal is switched to the USB path through management to realize the purpose of using the mobile phone as a sound card.
When the USB unpacking unit 202 is switched to be connected with the high-fidelity lossless DAC205 for configuration, the digital signals unpacked by the USB unpacking unit 202 are input into the high-fidelity lossless DAC205 and converted into analog signals; inputting the analog signal into an earphone operational amplifier for power amplification; and inputting the analog signal output by the earphone operational amplifier into an earphone loudspeaker for playing.
In summary, the invention provides a mobile phone, a system and an implementation method for a mobile sound card, wherein a lossless high-fidelity DAC device and a high-quality headphone or a high-quality headphone are selected and placed in a multimedia terminal device, which is equivalent to an external high-fidelity USB sound card, and the mobile phone has great advantages in portability; the mobile phone hardware is designed to expand the mobile phone effect of high-fidelity music output, so that the processing module of the earphone is used for improving the music quality relative to the original broadcasting equipment and selecting high-fidelity lossless tone qualities with different styles. Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations are possible to those skilled in the art in light of the above teachings, and that, for example, all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (5)
1. A mobile phone for moving a sound card, comprising: the system comprises USB OTG equipment, a USB unpacking unit, a mobile phone application processor, a selector, a high-fidelity lossless DAC and an earphone operational amplifier;
the USB OTG equipment is connected with the USB unpacking unit and the mobile phone application processor; the USB unpacking unit and the mobile phone application processor are respectively connected with the selector; the selector, the high-fidelity lossless DAC and the earphone operational amplifier are sequentially connected;
when detecting that the broadcasting equipment is connected, the USB OTG equipment identifies the master equipment and the slave equipment of the mobile phone; the mobile phone application processor calls different equipment type ID numbers according to the identification result and carries out corresponding operation: when the mobile phone is the main device, the mobile phone application processor acquires the corresponding ID value and matches the corresponding functional operation; when the mobile phone is a slave device, the mobile phone application processor switches the connection configuration to a USB unpacking unit to be connected with the high-fidelity lossless DAC, inputs the digital signal unpacked by the USB unpacking unit into the high-fidelity lossless DAC to be converted into an analog signal, inputs the analog signal into an earphone operational amplifier to carry out power amplification, and inputs the analog signal into an earphone loudspeaker to be played; the identification of the USB OTG equipment to the mobile phone owner and the slave equipment is as follows: when the grounding of the ID pin of the equipment is detected, the equipment is the main equipment; when the ID pin of the equipment is detected to be floating, the equipment is the slave equipment; when the mobile phone is a slave device, writing the read ID number into a mobile phone application processor, actively sending the ID number to the broadcasting device according to a USB protocol, and performing handshake operation between the broadcasting device and the mobile phone and reading the device ID number; the channel of the mobile phone is switched, and the music signal is switched to the USB channel through management to use the mobile phone as a sound card;
the device class ID number defines an interface descriptor for the device; if one equipment type is the whole equipment, the equipment type ID number is stored in an equipment type value field of the interface descriptor; if one equipment type is an interface of the equipment, storing the ID number of the equipment type in an interface type value field of an interface descriptor; the operating system determines the equipment type of the corresponding equipment according to the corresponding relation graph of the common equipment type and the ID number;
the selector switches and selects the connection relation between the modules: when the equipment type is the ID number of the main equipment, connecting the high-fidelity lossless DAC with the mobile phone application processor; and when the device type ID number is the ID number of the slave device, connecting the high-fidelity lossless DAC with the USB unpacking unit.
2. The mobile phone of claim 1, wherein the mobile phone further comprises: a first DC-DC circuit, a second DC-DC circuit;
the first DC-DC circuit is connected with the high-fidelity lossless DAC and used for carrying out voltage reduction processing on the voltage input into the high-fidelity lossless DAC;
and the second DC-DC circuit is connected with the earphone operational amplifier and is used for carrying out voltage reduction processing on the voltage input to the earphone operational amplifier.
3. The mobile phone with mobile sound card of claim 1, wherein the USB unpacking unit is used to remove USB protocol related protocol information and restore the USB protocol related protocol information to pure PCM and DSD data.
4. A system for moving a sound card, comprising: a public address device, a handset of a mobile sound card according to any of claims 1 to 3; the broadcasting equipment is connected with a mobile phone of the mobile sound card through a USB line.
5. A method for realizing a mobile phone with a mobile sound card is characterized by comprising the following steps:
step A, when detecting that equipment is connected, the USB OTG equipment identifies master equipment and slave equipment of the mobile phone;
b, the mobile phone application processor calls different equipment type ID numbers according to the identification result and carries out corresponding operation; the device type defines an interface descriptor of the corresponding device, and an ID number is distributed, and the ID number is respectively stored in a device type value field or an interface type value field according to the device type; the operating system determines the equipment type of the corresponding equipment according to the corresponding relation graph of the common equipment type and the ID number;
the step B specifically comprises the following steps:
b11, when the mobile phone is the main device, the mobile phone application processor obtains the corresponding ID value and matches the corresponding function operation;
b12, when the mobile phone is a slave device, the mobile phone application processor switches the connection configuration to a USB unpacking unit to be connected with the high-fidelity lossless DAC, and the input digital audio signal is decoded, amplified in power and then played;
the step B12 specifically includes:
b121, inputting the digital signal unpacked by the USB unpacking unit into a high-fidelity lossless DAC to be converted into an analog signal;
b122, inputting the analog signal into an earphone operational amplifier for power amplification;
b123, inputting the analog signal output by the earphone operational amplifier into an earphone loudspeaker for playing;
when the mobile phone is a slave device, writing the read ID number into a mobile phone application processor, actively sending the ID number to the broadcasting device according to a USB protocol, and performing handshake operation between the broadcasting device and the mobile phone and reading the device ID number; the channel of the mobile phone is switched, and the music signal is switched to the USB channel through management to use the mobile phone as a sound card;
the selector switches and selects the connection relation between the modules: when the equipment type is the ID number of the main equipment, connecting the high-fidelity lossless DAC with the mobile phone application processor; and when the device type ID number is the ID number of the slave device, connecting the high-fidelity lossless DAC with the USB unpacking unit.
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