CN1595814A - Ultra-minitype digital wireless music short-distance walkman - Google Patents
Ultra-minitype digital wireless music short-distance walkman Download PDFInfo
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- CN1595814A CN1595814A CN 200410028001 CN200410028001A CN1595814A CN 1595814 A CN1595814 A CN 1595814A CN 200410028001 CN200410028001 CN 200410028001 CN 200410028001 A CN200410028001 A CN 200410028001A CN 1595814 A CN1595814 A CN 1595814A
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Abstract
The invention is a microminiature digital wireless music short-distance personal stereo and its characteristic: it includes a transmitter composed of central processing and audio converting circuit, radio frequency module and indicator lamp as well as power supply control circuit, where the output end of the central processing and audio converting circuit is connected with the other three and the transmitter is provided with functional interface able to connected with DVD, CD, TV set or microphone; and at least a set of receive that can realize frequency conversion, composed of radio frequency receiving circuit, phase-locked loop and local oscillator circuit, medium-frequency demodulation circuit, MCU control circuit, central processing and audio frequency A/D converting circuit, audio amplification circuit, FM radio receiving circuit and switching circuit. It can be applied to playing family wireless music, personally enjoying family cinema sound and FM reception, realizes a machine for multiple uses, i.e. only when a transmitter of the invention is provided with single or multiple receivers matching with the invention can it meet the requirement on wireless playing of personal stereo.
Description
Technical field
What the present invention relates to is the wireless music player, the digital wireless music short distance of especially a kind of microminiature walkman.
Technical background
Along with the development and the progress of science and technology of society, the improving constantly of people's living standard, home theater or sound system have entered a lot of families, and it has enriched people's life.But the existing home theater sound equipment only suitable many people of system appreciate, and when the people thought to appreciate separately, open sound equipment can influence other people.Therefore, existing home theater or sound system can't satisfy modern's personalization appreciation requirement separately.
Summary of the invention
The objective of the invention is deficiency, provide a kind of and both be applicable to mobile occasion use, and have the digital wireless music short distance of equal acoustic microminiature walkman at above-mentioned existence.
The digital wireless music short distance of microminiature of the present invention walkman, it is characterized in that: comprise the transmitter that constitutes by central authorities' processing and audio conversion circuit, radio frequency module and indicator light and power control circuit, output termination radio frequency module and the indicator light and the power control circuit of central authorities' processing and audio conversion circuit, transmitter is provided with the functional interface that can be connected with DVD, CD, TV machine or microphone; At least one cover is by radio-frequency (RF) receiving circuit, phase-locked loop and local oscillation circuit, demodulation circuit of intermediate frequency, single chip machine controlling circuit, central authorities handle and the audio frequency analog to digital conversion circuit, audio amplifier circuit, the receiver of the frequency conversion function realized that FM broadcast receiver receiving circuit and switching circuit constitute, the intermediate-freuqncy signal output of radio-frequency (RF) receiving circuit is connected with demodulation circuit of intermediate frequency, another output of radio-frequency (RF) receiving circuit is connected with phase-locked loop and local oscillation circuit, the frequency control signal output of phase-locked loop and local oscillation circuit connects single chip machine controlling circuit, the data flow output of demodulation circuit of intermediate frequency meets central authorities and handles and the audio frequency analog to digital conversion circuit, central authorities handle and the audio signal output of audio frequency analog to digital conversion circuit passes through selector switch accessing to audio amplifying circuit, and audio amplifier circuit is provided with the functional interface that is connected with earphone.
Another key character of the digital wireless music short distance of microminiature of the present invention walkman is: receiver is furnished with the FM broadcast receiver receiving circuit that can make general broadcast receiver machine, and FM broadcast receiver receiving circuit is by selector switch accessing to audio amplifying circuit.
The operation principle of the digital wireless music short distance of microminiature of the present invention walkman is: the functional interface of transmitter and DVD or CD or TV source of sound are connected, utilize the central authorities of transmitter to handle and the audio frequency analog to digital conversion circuit, obtain the audio code stream of compression, be transmitted into the space through the radio frequency module, receive and listen to by earphone for the single or multiple receivers that are complementary with this device transmitter.
The digital wireless music short distance of microminiature of the present invention walkman design science, rational in infrastructure.This employing wireless mode passes audio signal and is digital signal, the mode that by receiver digital signal is transferred to voice playing again, significantly reduced and disturbed and reduction tonequality, can be used as the family wireless music, home theater sound equipment the individual appreciate and FM radio reception, realizes the function of a tractor serves several purposes, i.e. the reflector of inventing with a playscript with stage directions, be equipped with separate unit or many receivers that are complementary with the present invention, just can satisfy radio play individual walkman.
The structure of the digital wireless music short distance of microminiature of the present invention walkman is provided by the following drawings and embodiment.
Description of drawings
Fig. 1 is the composition block diagram of the digital wireless music short distance of microminiature walkman;
Fig. 2 A, 2B, 2C are the transmitter A circuit diagrams of the digital wireless music short distance of microminiature shown in Figure 1 walkman;
Fig. 3 A, 3B, 3C, 3D, 3E, 3F, 3G, 3H are the receiver B circuit diagrams of the digital wireless music short distance of microminiature shown in Figure 1 walkman.
Embodiment
Embodiment: can be clear that from Fig. 1 the digital wireless music short distance of microminiature walkman comprises: handle and the transmitter A of the frequency conversion function realized that audio frequency analog to digital conversion circuit 0, radio frequency transtation mission circuit 1 and indicator light and power control circuit 2 constitute by central authorities; Handle by radio-frequency (RF) receiving circuit 3, phase-locked loop and local oscillation circuit 4, demodulation circuit of intermediate frequency 5, single chip machine controlling circuit 6, central authorities and the receiver B of the frequency conversion function realized that audio frequency analog to digital conversion circuit 7 and earpiece audio amplifying circuit 8, FM broadcast receiver receiving circuit 9 and switching circuit 10 constitute at least one.
The central authorities of described transmitter handle and audio frequency analog to digital conversion circuit 0 (seeing Fig. 2 A) is made of numerical digit signal processor U1, audio frequency analog to digital converter U2, the first clock circuit X1 and second clock circuit X2, the work clock of audio frequency analog to digital converter U2 is provided by numerical digit signal processor U1, comprises dominant frequency clock MCLK, sampling clock LRCK and data clock sclk; Described numerical digit signal processor U1 is the interface IC that realizes connecting audio frequency analog to digital converter U2 and radio frequency transtation mission circuit 1, sends audio data to radio frequency transtation mission circuit 1.Audio frequency analog to digital converter U2 is provided with functional interface A-R, the A-L of the audio selection interface connection of DVD, CD, the connection of TV machine output, audio signal enters the audio frequency analog to digital converter U2 audio input end of transmitter by functional interface A-R, A-L, carry out analog-to-digital conversion, output audio code stream SDTO gives numerical digit signal processor U1, and the required clock signal of audio frequency analog to digital converter U2 is provided by numerical digit signal processor U1.The DATA end of numerical digit signal processor U1 is connected with the DATA end that connects radio frequency transtation mission circuit 1.The LED end of numerical digit signal processor U1 is connected with the LED end of indicator light and power control circuit 2, is used to control the normal bright of light-emitting diode or flicker.
After numerical digit signal processor U1 receives audio code stream SDTO, carry out the data compression, and be modulated into the binary bit pulse signal to radio frequency transtation mission circuit 1.
Radio frequency transtation mission circuit 1 (seeing Fig. 2 B) is made up of phase-locked loop circuit, voltage controlled oscillator VCO circuit, emission output circuit, and voltage controlled oscillator VCO is made of triode Q7, Q8 and peripheral cell; Phase-locked loop circuit is made of phase-locked loop chip U3 and single-chip microcomputer U4, and single-chip microcomputer U4 sends the data of required frequency to phase-locked loop chip U3, and phase-locked loop chip U3 control voltage controlled oscillator VCO tuning voltage locks required frequency.Pulse signal is added to voltage controlled oscillator VCO by resistance R 4, R9 and carries out the FSK modulation.
Indicator light and power control circuit 2 (seeing Fig. 2 C) comprising: four light-emitting diode D1, D2, D3, D4 and the ON-OFF control circuit that is made of resistance R 3 and field effect transistor Q2.Light-emitting diode D1, D2, D3, D4 indication complete machine state, when waiting state, light-emitting diode D1, D2, D3, D4 flicker, light-emitting diode D1, D2, D3, D4 Chang Liang during work.POW-SW is a high level during ON-OFF control circuit work, and field effect transistor Q2 grid is a high level, field effect transistor Q2 conducting, and complete machine ground inserts the ground of power panel, the complete machine energising.When receiver charged, POW-SW was a low level, and field effect transistor Q2 ends, and complete machine closes.
The signal flow of transmitter A is: DVD or CD or TV source of sound enter transmitter A by the audio selection interface, audio frequency analog to digital converter U2 by transmitter A is connected to numerical digit signal processor U1 input with output code flow, and the radio frequency transtation mission circuit is modulated after antenna transmission arrives the space signal.
The mixting circuit that described receiver radio frequency receiving circuit 3 (seeing Fig. 3 A) is made of preceding storing triode Q5, filter X6 and triode Q9, filter X5 and peripheral circuit.Radio-frequency (RF) receiving circuit 3 is amplified output signal and is connected to mixting circuit through filter X6.Receiver radio frequency receiving circuit 3 is provided with L-OSC end that is connected with phase-locked loop and local oscillation circuit 4 and the intermediate-freuqncy signal output IF end that is connected with demodulation circuit of intermediate frequency 5.
Phase-locked loop and local oscillation circuit 4 (seeing Fig. 3 B) comprising: phase-locked loop U5 and the Voltage-Controlled oscillation circuit that is made of triode Q10, Q11, Q12 triode and peripheral cell.Phase-locked loop and local oscillation circuit 4 produce the required local oscillation signal of mixing.C-DATA, the C-CLK of the phase-locked loop U5 of phase-locked loop and local oscillation circuit 4, LE termination single chip machine controlling circuit 6.The L-OSC end of phase-locked loop and local oscillation circuit 4 is connected with the L-OSC end of receiver radio frequency receiving circuit 3.
Demodulation circuit of intermediate frequency 5 (seeing Fig. 3 C), constitute by broadband FM demodulation chip U11, comparator U1-A, comparator U6-A and peripheral cell, the IF end of broadband FM demodulation chip U11 is connected with the IF end of receiver radio frequency receiving circuit 3, and the FSK-DATA end of comparator U6-A handles with central authorities and the respective end of audio frequency analog to digital conversion circuit 7 is connected.Broadband FM demodulation chip U11 demodulates fsk signal, detects data flow FSK-DATA by comparator U6-A and handles and audio frequency analog to digital conversion circuit 7 for central authorities.
Single chip machine controlling circuit 6 (seeing Fig. 3 D), show that by single-chip microcomputer U7, frequency-selecting knob S4, channel dichromatic LED D7 constitutes, frequency-selecting knob S4 is used to select channel, channel shows that dichromatic LED D7 is used for indicated channel, and single-chip microcomputer U7 is connected with C-DATA, C-CLK, the LE of phase-locked loop and local oscillation circuit 4 by C-DATA, C-CLK, LE end.It provides frequency data for phase-locked loop U3, and realizes channel switch realizing frequency conversion.
Central authorities handle and audio frequency analog to digital conversion circuit 7 (seeing Fig. 3 E) is handled with the central authorities of transmitter A and the structure of audio frequency analog to digital conversion circuit 0 is identical, the FSK-DATA end of the numerical digit signal processor U8 of central authorities' processing and audio frequency analog to digital conversion circuit 7 is connected with the respective end of demodulation circuit of intermediate frequency 5, audio signal input AUD-R, the AUD-L end of the audio signal output AUD-R of audio digital to analog converter U9, AUD-L ending connecting audio amplifying circuit 8.
Central authorities handle and audio frequency analog to digital conversion circuit 7 courses of work are: when numerical digit signal processor U8 receives the fsk signal that the broadband FM demodulation chip U11 of demodulator circuit 5 demodulates, decoding and decompress(ion) become audio frequency data process SDTO to give audio frequency analog to digital converter U9, and the audio data flow process of receiving that numerical digit signal processor U8 transmits for audio frequency analog to digital converter U9 clock signal LRCK, MCLK, SCLK, audio frequency analog to digital converter U9 converts audio signal to and passes to audio amplifier circuit 8 through capacitor C 79, C80, C81, C82.
Audio amplifier circuit 8 (seeing Fig. 3 F), this circuit are to set up an audio selected switch S6 at audio signal input AUD-R, AUD-L, RADIO-R, the RADIO-L end of conventional audio amplifier circuit.Audio signal output AUD-R, the AUD-L end of the audio digital to analog converter U9 of audio signal input AUD-R, the processing of AUD-L termination central authorities and the audio frequency analog to digital conversion circuit 7 of audio amplifier circuit 8; Audio signal RADIO-R, the RADIO-L end of the audio signal RADIO-R of audio amplifier circuit 8, RADIO-L termination FM broadcast receiver receiving circuit 9.Its course of work is: the amplifier U10 in the audio amplifier circuit 8 amplifies audio frequency or the broadcast receiver output audio that audio digital to analog converter U9 transmits, and gives earphone.Audio signal input AUD-R, AUD-L, RADIO-R, RADIO-L can select by audio selected switch S6,
FM broadcast receiver receiving circuit 9 (seeing Fig. 3 G) is known radio receiver module circuit, its audio signal RADIO-R, RADIO-L ending connecting audio amplifying circuit 8.The RADIO-R of its output, RADIO-L audio signal are given audio frequency amplifier U10 through audio selected switch S6.
Charging and switching circuit 10 (seeing Fig. 3 H) are made of field effect transistor Q13, diode D6, resistance R 64, battery B2, field effect transistor Q13 grid, drain electrode short circuit during charging, and field effect transistor Q13 ends, and complete machine is not worked.The Q13 grid is a high level at ordinary times, the complete machine energising, and receiver is holding state or operating state.
Claims (3)
1, the digital wireless music short distance of a kind of microminiature walkman, it is characterized in that: comprise the transmitter that constitutes by central authorities' processing and audio conversion circuit, radio frequency module and indicator light and power control circuit, output termination radio frequency module and the indicator light and the power control circuit of central authorities' processing and audio conversion circuit, transmitter is provided with the functional interface that can be connected with DVD, CD, TV machine or microphone; At least one cover is by radio-frequency (RF) receiving circuit, phase-locked loop and local oscillation circuit, demodulation circuit of intermediate frequency, single chip machine controlling circuit, central authorities handle and the audio frequency analog to digital conversion circuit, audio amplifier circuit, the receiver of the frequency conversion function realized that FM broadcast receiver receiving circuit and switching circuit constitute, the intermediate-freuqncy signal output of radio-frequency (RF) receiving circuit is connected with demodulation circuit of intermediate frequency, another output of radio-frequency (RF) receiving circuit is connected with phase-locked loop and local oscillation circuit, the frequency control signal output of phase-locked loop and local oscillation circuit connects single chip machine controlling circuit, the data flow output of demodulation circuit of intermediate frequency meets central authorities and handles and the audio frequency analog to digital conversion circuit, central authorities handle and the audio signal output of audio frequency analog to digital conversion circuit passes through selector switch accessing to audio amplifying circuit, and audio amplifier circuit is provided with the functional interface that is connected with earphone.
2, the digital wireless music short distance of microminiature according to claim 1 walkman, it is characterized in that: receiver A is furnished with one can make general wireless FM broadcast receiver receiving circuit (9), and FM broadcast receiver receiving circuit (9) is by selector switch accessing to audio amplifying circuit (8).
3, the digital wireless music short distance of microminiature according to claim 1 and 2 walkman, it is characterized in that: the central authorities of transmitter A handle and audio frequency analog to digital conversion circuit (0) is made of numerical digit signal processor U1, audio frequency analog to digital converter U2, the first clock circuit X1 and second clock circuit X2, the work clock of audio frequency analog to digital converter U2 is provided by numerical digit signal processor U1, comprises dominant frequency clock MCLK, sampling clock LRCK and data clock sclk; Described numerical digit signal processor U1 is the interface IC that realizes connecting audio frequency analog to digital converter U2 and radio frequency transtation mission circuit (1), sends audio data to radio frequency transtation mission circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410028001 CN1595814A (en) | 2004-07-06 | 2004-07-06 | Ultra-minitype digital wireless music short-distance walkman |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410028001 CN1595814A (en) | 2004-07-06 | 2004-07-06 | Ultra-minitype digital wireless music short-distance walkman |
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| Publication Number | Publication Date |
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| CN1595814A true CN1595814A (en) | 2005-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410028001 Pending CN1595814A (en) | 2004-07-06 | 2004-07-06 | Ultra-minitype digital wireless music short-distance walkman |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947882A (en) * | 2017-12-11 | 2018-04-20 | 广州市思创信息技术有限公司 | A kind of vehicle-mounted radio control system |
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2004
- 2004-07-06 CN CN 200410028001 patent/CN1595814A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947882A (en) * | 2017-12-11 | 2018-04-20 | 广州市思创信息技术有限公司 | A kind of vehicle-mounted radio control system |
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