Digital card-less telephone

A cordless phone, digital technology, applied in the direction of cordless phones, etc., can solve the problems of firmware not supporting hopping/spread spectrum technology, insufficient integration, affecting voice quality, etc., to enhance anti-interference ability and reduce spurious interference , the effect of high voice intelligibility

Inactive Publication Date: 2003-12-31
DALIAN CHANGFU RUIHUA GRP CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

However, the existing digital cordless telephone radio frequency circuits are often not integrated enough, resulting in complicated wiring and serious interference between lines.
There are various types of chips used in the baseband circuit, but most of them have the following problems in terms of their functions. Most of the firmware in the baseband circuit chip does not support hopping / spread spectrum technology, and the transceiver channel is often limited to a single frequency. The interference frequency is close to this frequency, and when the channel is severely distorted, the frequency will be converted to another fixed frequency, which will affect the voice quality

Method used

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  • Digital card-less telephone
  • Digital card-less telephone
  • Digital card-less telephone

Examples

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Embodiment Construction

[0018] In the digital cordless phone, the low-noise amplifier, the first mixer, and the amplifying drive part of the radio frequency circuit of the mobile phone are integrated into the second chip U 2 , the second mixer, limiting amplifier and power amplifier are integrated into the fifth chip U 5 .

[0019] The second chip U 2 The circuit connection is as figure 1 , figure 2 shown, the second chip U 2 Pin 5 via the nineteenth capacitor C 19 After bypass, connect to power supply V REG , 10 feet, 11 feet through the fifteenth capacitor C 15 bypassed with the supply V REG Connected, of which 11 pins are used as amplified drive gain control signals, 1, 2, 3, 4, 8, 12, 14, 15, 1 7, 1 8, 20, 23, 25, 26, 28 pins are grounded, 6 pins, 9 The feet are respectively connected from Figure 5 Mobile phone seventh chip U 7 The receive enable and transmit enable, the 7th pin is passed through the seventeenth capacitor C 17 Connect the first local oscillator circuit after DC coupl...

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Abstract

The digital card-less telephone has an IC chip U2 including low noise amplifier, frequency mixer and amplifying driver of hand set and base set; an IC chip U5 including frequency mixer, limiting amplifier and power amplifier; an IC chip U7 including demodulator, D / A converter, power amplifier of base band circuit as well as power amplifier, A / D converter and modulator of power amplifier and emitter circuit, an IC chip U8 including command operation memory, encoder, decoder, ringing detection and software dialing circuit; and software to control the frequency hopping of transmission and receiving. It has high circuit performance, high stability and high noise immunity, high security, clear voice. High emitted power and long communication distance.

Description

(1) Technical field: [0001] This invention relates to the design and manufacture of cordless telephones. (two) background technology: [0002] There are many types of cordless phones, but they can be roughly divided into two types: analog type and digital type according to their different modulation / reception methods. Digital cordless phones use advanced technologies such as high frequency 1915MHz-1920MHz, 32kbps ADPCM digital coding mode, and intelligent power management. Strong anti-interference performance, high voice clarity, good confidentiality, low transmission power and other advantages, gradually replaced the analog cordless phone. However, the existing radio frequency circuits of digital cordless phones are often not integrated enough, which leads to complicated wiring and serious interference between lines. There are various types of chips used in the baseband circuit, but most of them have the following problems in terms of their functions. Most of the firmware ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M1/72
Inventor 李世宽田晓明朱江王明轶王海都高智刘占钢孙明霞
Owner DALIAN CHANGFU RUIHUA GRP CO LTD
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