2.4G public frequency band digital visual interphone and method to process audio image

A voice processing and walkie-talkie technology, applied in pulse modulated television signal transmission, two-way working system, radio/induction link selection arrangement, etc. The frequency utilization rate of the analog walkie-talkie is not high, so as to achieve the effect of low power consumption, low manufacturing cost and good confidentiality

Inactive Publication Date: 2007-05-16
NINGBO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many shortcomings and deficiencies in the existing analog walkie-talkies: First, the analog walkie-talkies transmit analog signals, the signal processing method is simple, the power consumption is large, and the influence of interference and noise cannot be effectively eliminated, resulting in unsatisfactory call quality in many cases. Satisfied; Second, the frequency utilization rate of analog walkie-talkies is not high, and the channel capacity is low
Compared with conventional intercom systems, these digital systems are more complex and costly, and are generally only suitable for some high-end applications
In our country, there is no real digital walkie-talkie standard
[0004] With the continuous development of technology, digital video walkie-talkies have been successfully developed abroad, but there is no such digital video walkie-talkie in my country. First, some core technologies are in the hands of foreign companies, so it is difficult to develop products with independent intellectual property rights. Second, this kind of digital video walkie-talkie technology is complicated, the cost is high, and it is difficult to promote and apply it on a large scale

Method used

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  • 2.4G public frequency band digital visual interphone and method to process audio image
  • 2.4G public frequency band digital visual interphone and method to process audio image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: A digital video walkie-talkie in a 2.4G public frequency band, including a power supply circuit 1, a central processing unit 2, a voice codec circuit 3, a microphone 4, a loudspeaker 5, a COMS camera 6, a display device 7, and a radio frequency transceiver circuit 8 And antenna 9, power supply circuit 1 is any power supply in the prior art, can provide stable DC voltage for each circuit, speech codec circuit 3 is made up of the duplex voice chip and peripheral circuit of CMX649 of CML Microcircuits company, and CMX649 is Full-duplex codec mode, supports 16-128Kbps processing speed and supports ADM and CVSD, Linear-PCM, u-law PCM, A-law PCM and other encoding, filtering and gain can be controlled by programming, including a microphone inside Amplifier, digital clock correction, data quantization and dequantization and provide programmable sound level detection (VAD) so that users can adjust the threshold value and save power when the signal is low, provide i...

Embodiment 2

[0020] Embodiment 2: Other structures are the same as Embodiment 1, except that the central processing unit 2 is also connected with a keyboard input circuit 10 .

Embodiment 3

[0021] Embodiment 3: other structures are the same as Embodiment 2, the difference is that the central processing unit 2 is also provided with a backup memory 11 .

[0022] Each chip in the above embodiments can be replaced by other chips with the same function.

[0023]The action process of the present invention is as follows: (1) calling part: in group call realization, press PTT key, detect immediately whether group call channel (f0) is occupied, if occupied then report to the police, otherwise just obtain group call channel right of use ; Next, immediately send a pilot signal for a period of time, and then send a synchronization signal for a period of time; below, the surrounding users have been synchronized with the calling user by default, so the calling user can perform voice and image communication. When finished, press the PTT button again to release the channel, and other users can preemptively use it. In the paging implementation, the first is to dial (press a user...

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PUM

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Abstract

The disclosed digital visible walkie-talkie applied 2.4G public frequency band comprises: a power circuit, a speech process circuit with a microphone and loudspeaker and a speech coding/decoding circuit, a video process circuit included a display device and a COMS camera both connected with CPU, a CPU, a RF transmitting-receiving circuit with a 2.4G frequency band transmitting-receiving chip and peripheral circuit to connect with CPU, and an antenna. This invention can transfer both speech and video information simultaneously for high quality multimedia effect with low cost, and fit to spread in large scale.

Description

technical field [0001] The invention relates to a wireless walkie-talkie, in particular to a 2.4G public frequency band digital video walkie-talkie and a voice and image processing method. Background technique [0002] Analog walkie-talkies still occupy a large proportion in the current walkie-talkie market. There are many shortcomings and deficiencies in the existing analog walkie-talkies: First, the analog walkie-talkies transmit analog signals, the signal processing method is simple, the power consumption is large, and the influence of interference and noise cannot be effectively eliminated, resulting in unsatisfactory call quality in many cases. Satisfied; Second, the frequency utilization rate of the analog walkie-talkie is not high, and the channel capacity is low. Third, analog walkie-talkies have poor confidentiality and are easy to be eavesdropped. [0003] IDEN in the United States and TETRA in Europe have established relevant digital intercom (clustering) standa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/14H04N7/24H04N7/52H04Q7/28H04Q7/32
Inventor 何加铭朱风波曾兴斌刘太君张德添胡明明史沪臻洪涣
Owner NINGBO UNIV
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