CN216649835U

CN216649835U - Anti wireless video transmission device that shelters from

Info

Publication number: CN216649835U
Application number: CN202220019383.7U
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuxi Zhengqi Communication Technology Co ltd
Current assignee: Wuxi Zhengqi Communication Technology Co ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-05-31
Anticipated expiration: 2032-01-05

Abstract

The utility model relates to a transmitting device, in particular to an anti-blocking wireless video transmitting device. The wireless video and audio transmitting chip comprises a wireless video and audio transmitting chip, a radio frequency front end and an antenna. The wireless video transmitting chip is electrically connected with the radio frequency front end, and the radio frequency front end is electrically connected with the antenna. The radio frequency mixed module is arranged between the wireless audio-video transmitting chip and the radio frequency front end. The radio frequency mixing module comprises a radio frequency mixer and a single chip microcomputer, the radio frequency mixer is electrically connected with the single chip microcomputer, the wireless video transmitting chip is electrically connected with the radio frequency mixer, and the radio frequency mixer is electrically connected with the radio frequency front end. The video transmitting device has the advantages of sight distance transmission capability and good transmission effect.

Description

Anti wireless video transmission device that shelters from

Technical Field

The present invention relates to such a transmitting device, and more particularly, to an anti-occlusion wireless video transmitting device having non-line-of-sight transmission capability.

Background

At present, a conventional wireless video transmitting device includes a wireless video transmitting chip, a radio frequency front end and an antenna; the wireless video transmitting chip is electrically connected with the radio frequency front end, and the radio frequency front end is electrically connected with the antenna. The wireless video transmitting chip can be used for analog FM transmission or digital FSK transmission of a 2.4GHz ISM frequency band, and 1 radio frequency modulator, a dual-channel audio modulator and 1 radio frequency power amplifier are integrated in the chip. The radio frequency modulation module integrates 1 VCO (voltage controlled oscillator) with 2.4GHz and is used for generating frequency modulation signals with 2.4 GHz. Two audio modulators on the chip modulate the stereo audio signal to 6MHz and 6,5MHz, respectively. However, the wireless video transmitting chip works at a frequency of 2.4GHz, and the 2.4GHz does not have a non-line-of-sight transmission capability, so that the conventional wireless video transmitting device cannot achieve a good transmission effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an anti-blocking wireless video transmitting device which has line-of-sight transmission capability and good transmission effect.

In order to solve the problems, the following technical scheme is provided:

the anti-shielding wireless video transmitting device comprises a wireless video transmitting chip, a radio frequency front end and an antenna. The wireless video transmitting chip is electrically connected with the radio frequency front end, and the radio frequency front end is electrically connected with the antenna. The radio frequency front end is connected with the wireless video and audio transmitting chip through a radio frequency mixing module. The radio frequency mixing module comprises a radio frequency mixer and a single chip microcomputer, the radio frequency mixer is electrically connected with the single chip microcomputer, the wireless audio-video transmitting chip is electrically connected with the radio frequency mixer, and the radio frequency mixer is electrically connected with the radio frequency front end.

The radio frequency front end comprises a low-pass filter 1, a driving amplifier, a low-pass filter 2, a power amplifier and a low-pass filter 3. The radio frequency mixer is electrically connected with the low-pass filter 1, the driving amplifier and the power amplifier, the low-pass filter 1 is electrically connected with the driving amplifier, the driving amplifier is electrically connected with the low-pass filter 2, the low-pass filter 2 is electrically connected with the power amplifier, the power amplifier is electrically connected with the low-pass filter 3, and the low-pass filter 3 is electrically connected with the antenna.

The wireless video transmitting chip comprises a transmitting chip U1 with the model of RTC6701, the radio frequency mixer comprises a radio frequency chip U2 with the model of RFFC2072, and a band-pass filter FL1 is arranged between the transmitting chip U1 and the radio frequency chip U2. A PAOUT1 pin of the emitting chip U1 is used for an external power supply after passing through a second inductor L2 and a first resistor R1 IN sequence, one end of the first resistor R1 adjacent to the second inductor L2 is grounded through a first capacitor C1, a PAOUT2 pin of the emitting chip U1 is connected with a PAOUT1 pin of the emitting chip U1 through a second resistor R2, a PAOUT1 pin of the emitting chip U1 is connected with an IN end of the band-pass filter FL1 after passing through a third inductor L3, a fourth inductor L4 and a fourth capacitor C4 IN sequence, and one end of the fourth inductor L4 adjacent to the third inductor L3 is grounded through an eighth capacitor C8. The GND end of the band-pass filter FL1 is grounded, the OUT end of the band-pass filter FL1 is connected with one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is connected with the MIX2_ IPP pin of the radio frequency chip U2 after passing through a first inductor L1 and a third capacitor C3 in sequence, and one end of the third capacitor C3 close to the first inductor L1 is grounded through a second capacitor C2. One end of a fifth capacitor C5 far away from the band-pass filter FL1 is connected to the MIX2_ IPN pin of the rf chip U2 after passing through the sixth capacitor C6 and the seventh capacitor C7 in sequence, and one end of a seventh capacitor C7 near the sixth capacitor C6 is grounded through the fifth inductor L5.

By adopting the scheme, the method has the following advantages:

because the radio frequency mixing module is arranged between the wireless video transmitting chip and the radio frequency front end of the anti-shielding wireless video transmitting device, the radio frequency mixing module comprises the radio frequency mixing module which comprises a radio frequency mixer and a single chip microcomputer, the radio frequency mixer is electrically connected with the single chip microcomputer, the wireless video transmitting chip is electrically connected with the radio frequency mixer, and the radio frequency mixer is electrically connected with the radio frequency front end. The wireless video transmitting device utilizes the radio frequency mixing module to move the 2.4GHz frequency sent by the wireless video transmitting chip to a UHF frequency band such as 433MHz, and wireless signals of the UHF frequency band are radiated to the space through the radio frequency front end and the antenna. Compared with 2.4GHz, the UHF frequency band has longer wavelength and is easier to penetrate through obstacles, so that the UHF frequency band has stronger anti-shielding capability and non-line-of-sight transmission capability and better transmission effect.

Drawings

FIG. 1 is a schematic diagram of an anti-occlusion wireless video transmission device of the present invention;

FIG. 2 is a schematic diagram of the RF front end of the anti-blocking wireless video transmitter of the present invention;

FIG. 3 is a schematic circuit diagram of a wireless video/audio transmitting chip and a radio frequency mixer in the anti-blocking wireless video transmitting device according to the present invention;

fig. 4 is a flowchart of the operation of the anti-occlusion wireless video transmission apparatus of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the anti-blocking wireless video transmitting device of the present invention includes a wireless video transmitting chip, a radio frequency front end and an antenna. The wireless video transmitting chip is electrically connected with the radio frequency front end, and the radio frequency front end is electrically connected with the antenna. And a radio frequency mixing module is arranged between the wireless video transmitting chip and the radio frequency front end. The radio frequency mixing module comprises a radio frequency mixer and a single chip microcomputer, the radio frequency mixer is electrically connected with the single chip microcomputer, the wireless audio-video transmitting chip is electrically connected with the radio frequency mixer, and the radio frequency mixer is electrically connected with the radio frequency front end.

As shown in fig. 2, the radio frequency front end includes a low pass filter 1, a driver amplifier, a low pass filter 2, a power amplifier, and a low pass filter 3. The radio frequency mixer is electrically connected with the low-pass filter 1, the driving amplifier and the power amplifier, the low-pass filter 1 is electrically connected with the driving amplifier, the driving amplifier is electrically connected with the low-pass filter 2, the low-pass filter 2 is electrically connected with the power amplifier, the power amplifier is electrically connected with the low-pass filter 3, and the low-pass filter 3 is electrically connected with the antenna. The rf mixer delivers two types of signals to the rf front-end UHF, one is the output signal TX and the other is the output enable, which is used to control the driver amplifier and the power amplifier.

As shown in fig. 3, the wireless video/audio transmitting chip includes a transmitting chip U1 with a model of RTC6701, the rf mixer includes a rf chip U2 with a model of RFFC2072, and a band-pass filter FL1 is disposed between the transmitting chip U1 and the rf chip U2. A PAOUT1 pin of the emitting chip U1 is used for an external power supply after passing through a second inductor L2 and a first resistor R1 IN sequence, one end of the first resistor R1 adjacent to the second inductor L2 is grounded through a first capacitor C1, a PAOUT2 pin of the emitting chip U1 is connected with a PAOUT1 pin of the emitting chip U1 through a second resistor R2, a PAOUT1 pin of the emitting chip U1 is connected with an IN end of the band-pass filter FL1 after passing through a third inductor L3, a fourth inductor L4 and a fourth capacitor C4 IN sequence, and one end of the fourth inductor L4 adjacent to the third inductor L3 is grounded through an eighth capacitor C8. The GND end of the band-pass filter FL1 is grounded, the OUT end of the band-pass filter FL1 is connected with one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is connected with the MIX2_ IPP pin of the radio frequency chip U2 after passing through a first inductor L1 and a third capacitor C3 in sequence, and one end of the third capacitor C3 close to the first inductor L1 is grounded through a second capacitor C2. One end of a fifth capacitor C5 far away from the band-pass filter FL1 is connected to the MIX2_ IPN pin of the rf chip U2 after passing through the sixth capacitor C6 and the seventh capacitor C7 in sequence, and one end of a seventh capacitor C7 near the sixth capacitor C6 is grounded through the fifth inductor L5.

The transmitting chip U1 with the model number of RTC6701 is manufactured by Richawave corporation. The radio frequency chip U2 with the model number of RFFC2072 is manufactured by Qorvo corporation. The drive amplifier is TQP3M 9036. The power amplifier is an RFPA 3800.

As shown in fig. 4, in use, an analog video signal is input into RFFC2072, RFFC2072 generates a modulation signal and transmits a 2.4GHz signal to RFFC2072, RFFC2072 converts the 2.4GHz signal into a UHF signal, and the UHF signal is amplified by a radio frequency front end and then transmitted to the space by an antenna.

The radio frequency chip U2 of the RFFC2072 is internally provided with a voltage-controlled oscillator, a phase-locked loop and a frequency mixer, and the singlechip configures the radio frequency chip U2 of the RFFC2072 through a control interface, wherein the control interface comprises local oscillation frequency, frequency mixer enabling and the like. Analog video signals are modulated by a transmitting chip U1 of the RTC6701 and then transmitted, 2.4GHz signals transmitted by the RTC6701 are transmitted to a space after being filtered and power amplified through a mixer of the RFFC2072, and the receiver can realize receiving and demodulation by setting the same UHF frequency.

The main characteristics of the rf chip U2 of the RFFC2072 are as follows: the local oscillation frequency range is 85MHz-2700 MHz; typical stepping 1.5 Hz; fully integrating a low phase noise VCO with an LO buffer; typical values of phase noise are 0.18Degree RMS @1 GHz; a high linearity mixer; 30-2700MHz mixer frequency range; the input IP3 may be up to 23 dBm.

Claims

1. An anti-shielding wireless video transmitting device comprises a wireless video transmitting chip, a radio frequency front end and an antenna; the wireless video transmitting chip is electrically connected with the radio frequency front end, and the radio frequency front end is electrically connected with the antenna; the wireless video and audio transmitting chip is characterized in that a radio frequency mixing module is arranged between the wireless video and audio transmitting chip and the radio frequency front end; the radio frequency mixing module comprises a radio frequency mixer and a single chip microcomputer, the radio frequency mixer is electrically connected with the single chip microcomputer, the wireless audio-video transmitting chip is electrically connected with the radio frequency mixer, and the radio frequency mixer is electrically connected with the radio frequency front end; the wireless video transmitting chip comprises a transmitting chip U1 with the model of RTC6701, the radio frequency mixer comprises a radio frequency chip U2 with the model of RFFC2072, and a band-pass filter FL1 is arranged between the transmitting chip U1 and the radio frequency chip U2; a PAOUT1 pin of the emitting chip U1 is used for an external power supply after passing through a second inductor L2 and a first resistor R1 IN sequence, one end of the first resistor R1 adjacent to the second inductor L2 is grounded through a first capacitor C1, a PAOUT2 pin of the emitting chip U1 is connected with a PAOUT1 pin of the emitting chip U1 through a second resistor R2, a PAOUT1 pin of the emitting chip U1 is connected with an IN end of a band-pass filter FL1 after passing through a third inductor L3, a fourth inductor L4 and a fourth capacitor C4 IN sequence, and one end of the fourth inductor L4 adjacent to the third inductor L3 is grounded through an eighth capacitor C8; the GND end of the band-pass filter FL1 is grounded, the OUT end of the band-pass filter FL1 is connected with one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is connected with the MIX2_ IPP pin of the radio frequency chip U2 after passing through a first inductor L1 and a third capacitor C3 in sequence, and one end of the third capacitor C3 close to the first inductor L1 is grounded through a second capacitor C2; one end of a fifth capacitor C5 far away from the band-pass filter FL1 is connected to the MIX2_ IPN pin of the rf chip U2 after passing through the sixth capacitor C6 and the seventh capacitor C7 in sequence, and one end of a seventh capacitor C7 near the sixth capacitor C6 is grounded through the fifth inductor L5.

2. The anti-occlusion wireless video transmission device of claim 1, wherein the radio frequency front end comprises a low pass filter 1, a driver amplifier, a low pass filter 2, a power amplifier, and a low pass filter 3; the radio frequency mixer is electrically connected with the low-pass filter 1, the driving amplifier and the power amplifier, the low-pass filter 1 is electrically connected with the driving amplifier, the driving amplifier is electrically connected with the low-pass filter 2, the low-pass filter 2 is electrically connected with the power amplifier, the power amplifier is electrically connected with the low-pass filter 3, and the low-pass filter 3 is electrically connected with the antenna.