CN2888752Y

CN2888752Y - Single-frequency point full duplex wireless digital transmitter-receiver

Info

Publication number: CN2888752Y
Application number: CN 200620028231
Authority: CN
Inventors: 林志琦; 路永健; 郎建军
Original assignee: Changchun University of Technology
Current assignee: Changchun University of Technology
Priority date: 2006-02-07
Filing date: 2006-02-07
Publication date: 2007-04-11
Anticipated expiration: 2016-02-07

Abstract

The utility model discloses a full duplex wireless digit dialogue radio station of the single frequency spot, which comprises a DSP integrated circuit and a relative circuit. The voice signal, passing through a voice tube, is converted into an electrical signal; the electrical signal, magnified by a voice tube amplifying circuit, is sent to a DSP integrated circuit and converted to a digital signal by an A/D converter inside the DSP integrated circuit; the digital signal is saved in the RAM inside the DSP integrated circuit. The train of signals acquired is compressed to be a PCM code by the DSP integrated circuit, and then modulated; The local oscillation signal is generated by a radio-frequency signal source circuit; the modulation signal encoded by the DSP integrated circuit is modulated in the modulation circuit together with the local oscillation signal; the modulated signal is transmitted by an antenna wire; Aerial wire receives the signal transmitted by a full duplex wireless digit dialogue radio station at other single frequency spot; the signal is sent to the DSP integrated circuit by the wireless receiving circuit; the PCM code is recovered by the DSP integrated circuit; the recovered sound waveform is sent to the audio frequency power magnifying circuit and recovered to be a sound by a horn.

Description

Single-frequency point full duplex radio numeral intercommunication radio station

Technical field

The utility model relates to a kind of wireless telecommunications system, particularly a kind of single-frequency point full duplex radio numeral intercommunication radio station.

Background technology

At present, the intercom that existing radio station promptly is commonly called as can not send when adopting the single-simplex operation mode promptly to receive usually in order to save the radio frequency resource, can not receive when sending, and need switch transmitting-receiving with manual mode, inconvenient operation, communication effect is bad.And common full duplex call need take two Frequency points, and this can cause the radio frequency resource seriously deficient, so seldom be used in actual applications.

The utility model content

The purpose of this utility model is will solve when simplex radio numeral intercommunication radio station receives to send, can not receive when sending, and need switch transmitting-receiving and full duplex radio numeral intercommunication radio station need take the problem of two Frequency points with manual mode, and a kind of digital intercommunication of single-frequency point full duplex radio radio station that overcomes above-mentioned shortcoming is provided.

The utility model includes the DSP integrated circuit, microphone, the microphone amplifying circuit, audio power amplifier circuit, loudspeaker, the radiofrequency signal source circuit, modulation circuit, the radio-frequency (RF) power amplification circuit, antenna, wireless receiving circuit, keyboard and display screen, wherein the DSP integrated circuit respectively with the microphone amplifying circuit, audio power amplifier circuit, the radiofrequency signal source circuit, modulation circuit, wireless receiving circuit, keyboard and display screen are connected, loudspeaker are connected with audio power amplifier circuit, the radio-frequency (RF) power amplification circuit, wireless receiving circuit is connected with antenna, microphone is connected with the microphone amplifying circuit, the radiofrequency signal source circuit is connected with modulation circuit, modulation circuit is connected with the radio-frequency (RF) power amplification circuit, wherein, the radiofrequency signal source circuit is by triode, inductance coil, electric capacity is formed, modulation circuit is the triode modulation circuit, the radio-frequency (RF) power amplification circuit is the triode power amplification circuit, wireless receiving circuit is selected the MC3357P chip for use, the DSP integrated circuit is selected the TMC320C5402 chip for use, audio power amplifier circuit is selected the LM386 chip for use, the microphone amplifying circuit is selected the 2SC1359 field effect transistor for use, has A/D converter in the DSP integrated circuit, random access memory ram, encoder.

Operation principle of the present utility model is: voice signal is after microphone is converted to the signal of telecommunication, amplify by the microphone amplifying circuit, send into the DSP integrated circuit, convert digital signal to and it is stored among the RAM of DSP IC interior through DSP IC interior A/D converter, the DSP integrated circuit compresses the adopt burst that comes and is pcm encoder, modulates then; Local oscillation signal is that the PLL circuit produces by the radiofrequency signal source circuit, modulates in modulation circuit with local oscillation signal through DSP integrated circuit modulated message after coded, and the signal after the modulation is launched by antenna; Antenna receives the signal that another single-frequency point full duplex radio numeral intercommunication radio station is launched, deliver to the DSP integrated circuit by wireless receiving circuit, deliver to audio power amplifier circuit via DSP integrated circuit reduction pcm encoder and reduction sound waveform again and amplify, be reduced into sound by loudspeaker then.

Emission of the present utility model hockets with t=0.5ms respectively fast with reception, the voice data that receives interval with 125us on time shaft is expanded, the encoded content that the 0.5ms time period is received expands to the content of 1ms, receiving-transmitting sides obtains the continuous voice signal of the other side on can be at one time like this, on same radio frequency, realized with frequency word full duplex call, thereby reached the purpose of on same frequency, setting up the bidirectional information seamless delivery.

The beneficial effects of the utility model are, can realize two-way seamless digital full duplex voice communication on same Frequency point, improve speech quality, and the user is easy to use, saves the radio frequency resource greatly.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is the concrete circuit diagram of the utility model embodiment.

Fig. 3 is a voice signal modulation variation schematic diagram of the present utility model.

Embodiment

See also Fig. 1, shown in Figure 2, the utility model includes DSP integrated circuit 7, microphone 11, microphone amplifying circuit 9, audio power amplifier circuit 8, loudspeaker 10, radiofrequency signal source circuit 1, modulation circuit 2, radio-frequency (RF) power amplification circuit 3, antenna 4, wireless receiving circuit 6, keyboard and display screen 12, wherein DSP integrated circuit 7 respectively with microphone amplifying circuit 9, audio power amplifier circuit 8, radiofrequency signal source circuit 1, modulation circuit 2, wireless receiving circuit 6, keyboard and display screen 12 are connected, loudspeaker 10 are connected 8 with audio power amplifier circuit, microphone 11 is connected with microphone amplifying circuit 9, radiofrequency signal source circuit 1 is connected with modulation circuit 2, modulation circuit 2 is connected with radio-frequency (RF) power amplification circuit 3, radio-frequency (RF) power amplification circuit 3, wireless receiving circuit 6 is connected with antenna 4, wherein, radiofrequency signal source circuit 1 is by triode, inductance coil, electric capacity is formed, modulation circuit 2 is the triode modulation circuit, radio-frequency (RF) power amplification circuit 3 is the triode power amplification circuit, wireless receiving circuit 6 is selected the MC3357P chip for use, DSP integrated circuit 7 is selected the TMC320C5402 chip for use, audio power amplifier circuit 8 is selected the LM386 chip for use, microphone amplifying circuit 9 is selected the 2SC1359 field effect transistor for use, has A/D converter in the DSP integrated circuit 7, random access memory ram, encoder.

Operation principle of the present utility model is: voice signal is after microphone 11 is converted to the signal of telecommunication, amplify by microphone amplifying circuit 9, send into DSP integrated circuit 7, convert digital signal to and it is stored among the RAM of DSP integrated circuit 7 inside through DSP integrated circuit 7 inner A/D converters, 7 pairs of bursts that come of adopting of DSP integrated circuit compress and are pcm encoder, modulate then; Local oscillation signal is that the PLL circuit produces by radiofrequency signal source circuit 1, modulates in modulation circuit 2 with local oscillation signal through DSP integrated circuit 7 modulated message after coded, and the signal after the modulation is by antenna 4 emissions; Antenna 4 receives the signal that another single-frequency point full duplex radio numeral intercommunication radio station is launched, deliver to DSP integrated circuit 7 by wireless receiving circuit 6, deliver to audio power amplifier circuit 8 via DSP integrated circuit 7 reduction pcm encoders and reduction sound waveform again and amplify, be reduced into sound by loudspeaker 10 then.

See also shown in Figure 3, in the present embodiment, the utility model adopts the sample frequency of 8KHz, 8 sampled datas on the 1ms (sampled point is 125us at interval) (being each sampled point 62.5us at interval) on the time zone of 0.5ms are compressed arrangement again, and launch with the time of t=0.5ms, 0.5ms afterwards enters the reception mate side encoding law type, reception receives the data of sending in the identical deflation mode of same frequency, again the data interval with 125us on time shaft that receives is expanded, the encoded content that the 0.5ms time period is received expands to the 1ms content, receiving-transmitting sides obtains the continuous voice signal of the other side on can be at one time like this, has realized on same radio frequency point with frequency word full duplex call.

The beneficial effects of the utility model are to realize that two-way seamless numeral is complete at same Frequency point Duplex voice communication is improved speech quality, and the user is easy to use, greatly saves the radio frequency resource.

Claims

1, a kind of single-frequency point full duplex radio numeral intercommunication radio station, it is characterized in that: include the DSP integrated circuit, microphone, the microphone amplifying circuit, audio power amplifier circuit, loudspeaker, the radiofrequency signal source circuit, modulation circuit, the radio-frequency (RF) power amplification circuit, antenna, wireless receiving circuit, keyboard and display screen, wherein the DSP integrated circuit respectively with the microphone amplifying circuit, audio power amplifier circuit, the radiofrequency signal source circuit, modulation circuit, wireless receiving circuit, keyboard and display screen are connected, loudspeaker are connected with audio power amplifier circuit, microphone is connected with the microphone amplifying circuit, the radiofrequency signal source circuit is connected with modulation circuit, modulation circuit is connected with the radio-frequency (RF) power amplification circuit, the radio-frequency (RF) power amplification circuit, wireless receiving circuit is connected with antenna, wherein, the radiofrequency signal source circuit is by triode, inductance coil, electric capacity is formed, modulation circuit is the triode modulation circuit, the radio-frequency (RF) power amplification circuit is the triode power amplification circuit, wireless receiving circuit is selected the MC3357P chip for use, the DSP integrated circuit is selected the TMC320C5402 chip for use, audio power amplifier circuit is selected the LM386 chip for use, the microphone amplifying circuit is selected the 2SC1359 field effect transistor for use, has A/D converter in the DSP integrated circuit, random access memory ram, encoder, voice signal is after microphone is converted to the signal of telecommunication, amplify by the microphone amplifying circuit, send into the DSP integrated circuit, convert digital signal to and it is stored among the RAM of DSP IC interior through DSP IC interior A/D converter, the DSP integrated circuit compresses the adopt burst that comes and is pcm encoder, modulates then; Local oscillation signal is that the PLL circuit produces by the radiofrequency signal source circuit, modulates in modulation circuit with local oscillation signal through DSP integrated circuit modulated message after coded, and the signal after the modulation is launched by antenna; Antenna receives the signal that another single-frequency point full duplex radio numeral intercommunication radio station is launched, deliver to the DSP integrated circuit by wireless receiving circuit, deliver to audio power amplifier circuit via DSP integrated circuit reduction pcm encoder and reduction sound waveform again and amplify, be reduced into sound by loudspeaker then.