FM circuit for handheld mobile device
A technology of frequency modulation circuits and mobile devices, applied in broadcast receiving circuits, electrical components, transmission systems, etc., can solve the problems of not being able to record FM voice, restricting mobile phone functions, and not being able to transmit baseband chips, etc.
Inactive Publication Date: 2008-09-10
ZTE CORP
View PDF1 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Existing terminals can only realize simple FM listening and playing functions, but cannot record FM voice
Although there is a baseband chip, the audio signal can only be processed by a dedicated sound processing chip and cannot be transmitted to the baseband chip, thus limiting the functions of the mobile phone
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0019] The core of the FM circuit proposed by the present invention is to use the microphone (MIC) path to realize the FM audio signal input to the baseband chip, thereby realizing the recording function. The MIC audio signal sent by the MIC to the MIC channel has the same nature as the FM audio signal sent by the FM chip, both of which are FM audio signals, so they can be used as the input of the baseband chip. The input of the baseband chip is realized by the MIC path, considering that the FM audio signal output by the FM chip sometimes does not match the FM audio signal required by the baseband chip, the present invention adds a matching circuit, and the FM audio signal sent by the FM chip is sent by the matching circuit. The parameters of the audio signal are adjusted to the allowable range of the baseband chip, and enter the baseband chip through the MIC channel. On the one hand, the matching circuit adjusts the amplitude of the FM audio signal to make it suitable for the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a frequency modulation circuit of a handheld mobile device. The frequency modulation circuit of the handheld mobile device comprises a modulation circuit and a baseband chip, wherein, an input end of the baseband chip is provided with a microphone access, and the modulation circuit can realize modulation function by the controlling of the baseband chip; the modulation circuit of the handheld mobile device further comprises a matching circuit, and the matching circuit receives the modulation frequency audio signals output by the modulation circuit, is used for adjusting the parameters of the modulation frequency audio signals, leads the modulation frequency audio signals to meet the requirements of the microphone access, and sends the adjusted modulation frequency audio signals to the baseband chip. The technical proposal adopted by the invention can lead the baseband chip to take part in the processing of the audio signals, overcomes the defects of the existing FM circuit, and extends the terminal functions.
Description
technical field [0001] The invention relates to a mobile phone technology, in particular to a frequency modulation circuit of a hand-held mobile device. Background technique [0002] The integration of the frequency modulation (FM) function on the mobile terminal greatly facilitates users, and quite a few mobile phones already have the FM function on the market. Current FM circuits generally use FM chips to generate FM audio signals, which are amplified by audio power amplifiers and output to audio output devices (such as speakers, earphones, etc.). [0003] The patent application of Chinese application number CN200520066536 discloses a mobile phone with a built-in mini radio module, including a mobile phone casing and a mobile phone main circuit board located in the mobile phone casing. The main circuit board of the mobile phone is provided with a baseband chip, and the main circuit board of the mobile phone There is also a radio module on the top, the radio module include...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H04B1/16H04H40/45
Inventor 张文刚赵恺
Owner ZTE CORP