CN2496192Y

CN2496192Y - Radio tourist guider

Info

Publication number: CN2496192Y
Application number: CN 01232801
Authority: CN
Inventors: 叶新民; 李忠恩; 高庆信
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-03
Filing date: 2001-08-03
Publication date: 2002-06-19
Anticipated expiration: 2011-08-03

Abstract

The utility model provides a radio tour guiding apparatus, which relates to the radio emitting and receiving technical field. The utility model comprises a plurality of transmitting sets and a plurality of receiving sets. The utility model is characterized in that each transmitting set turns the voice signal in a single chip frequency modulation emitting integrated circuit to an oscillation loop and a frequency selection amplifying loop through a port to gain a 72 MHz radio frequency signal, and then the signal is emitted by a matching network via a power amplification loop. Each receiving set inputs the radio frequency signal to the loop to turn in an FM radio receiving private integrated circuit, the private integrated circuit is respectively turned in a volume controlling loop and the power amplification loop and the speech sound is outputted by the earphone. The utility model used in a tour area is just like a radio set, a person can choose the channel and the content about the tour sight freely, the mutual interference among the tourists can be avoided, the tourists can make free activity, and the tour interest of the tourists is increased. The utility model achieves the unification of the perfect performance, the low cost and the small volume of the receiving set.

Description

The radio guide device

(1) technical field

The utility model relates to radio transmission, reception technique field, especially utilizes the radio guide device of radio transmission and reception.

(2) prior art

Up to now, tourist guide's mode of conducting a sightseeing tour is generally adopted in the domestic appearance that does not also have radio guide net, the guide service of tourist attraction.This traditional guide's mode, its shortcoming is the cost height, visitor's the degree of freedom is little, and service quality is directly related with guide's professional qualities, if run into unfavorable tourist guide, can directly influence visitor's mood.In recent years, relevant guide's complaint is ascendant trend year by year.Some tourist attraction in the prior art has adopted and has hired out guide's video tape recorder or directly use mode such as loudspeaker plays commentary at the sight spot, and the visitor selects and rating is poor, phase mutual interference, the shortcoming that free activity is low but still exist.

(3) technology contents

At the shortcoming that exists in the prior art, the technical problem that the utility model solves provides a kind of radio guide device.When people used in tourist district, it listens to the radio as people can freely select channel and tourist attractions related content thereof, exempted the phase mutual interference, can be free movable, increase visitor's tourism interest.

The technical solution of the utility model realizes in the following way: the radio guide device, it is made up of many transmitters and many receivers of number.Described transmitter comprises the monolithic frequency modulation emission integrated circuit of being made up of audio frequency amplifier, voltage controlled oscillator and frequency interleaved modulation modulator, oscillation circuit, frequency-selecting amplifying return circuit, power amplification loop and power supply supply loop; Described receiver comprises electronic tuning monolithic FM radio reception application-specific integrated circuit (ASIC), power amplification loop, volume regulating loop, channel selection loop, channel show circuit and the power supply supply loop of being made up of intermediate frequency amplifier, amplitude limiter, frequency discriminator.Its design feature is, described transmitter is that the audio signal that will comprise the voice broadcast of voice module, CD, disk, microphone inserts the monolithic frequency modulation emission integrated circuit that model is MC2831A by interface, this monolithic frequency modulation emission integrated circuit joins with oscillation circuit, frequency-selecting amplifying return circuit again and obtains the 72MHz radiofrequency signal, and frequency-selecting amplifying return circuit and power amplification loop join and launch from antenna through output matching network; Described receiver receives radiofrequency signal by input circuit through antenna and inserts special-purpose FM radio reception integrated circuit and the local oscillation signal intermediate-freuqncy signal of mixing generation 70KHz mutually that model is TDA7088T, the audio detection signal inserts the power amplification loop is made up of two triodes and exports voice by earphone or loud speaker by the volume control loop behind intermediate frequency amplification, amplitude limit, frequency discrimination, channel selection loop and FM radio reception application-specific integrated circuit (ASIC), channel show circuit join, and FM radio reception application-specific integrated circuit (ASIC) also joins with the channel show circuit and controls the channel demonstration.

According to above-mentioned technical scheme, it is that the switch power module of TNY255P inserts halfwave rectifier loop output dc voltage again for each loop use that the power supply supply loop of described this transmitter adopts civil power to insert model after full-wave rectification;

According to above-mentioned technical scheme, the volume regulating loop of described receiver is that digital potentiometer and two inching button switch VOL of X9511W form by model, the high potential input and the TDA7088T application-specific integrated circuit (ASIC) output of digital potentiometer join, its output voltage control end joins with inching button switch VOL respectively, and its output and described power amplification loop input join.

According to above-mentioned technical scheme, the channel selection loop of described receiver is that digital potentiometer and two inching button switch S CAN of X9511 form by model, the output voltage control end and the set variable capacitance diode BB910 of digital potentiometer join, and make variable capacitance diode BB910 present different capacitances.Variable capacitance diode BB910 and set K switch 2 are joined, by the be connected in parallel local oscillator loop of the different FM radio reception application-specific integrated circuit (ASIC) of component frequency of K switch 2 and set oscillator coil L1 or L2.Because guide's broadcasting frequency adopts 72MHz-72.5MHz, and tuned radio frequency is 88-108MHz, so adopt two groups of external coils of local oscillator, is switched by outside toggle switch, realizes listening to local FM broadcasting.

According to above-mentioned technical scheme, the channel show circuit of described receiver be by the binary-coded decimal that two models binary-coded decimal reversible counting integrated circuit that is CC4029 and two models are CC4511 latch/display serial connection that 7 sections decoding/driver ICs and two models are LED5011 forms.

The utility model is owing to adopted above-mentioned emission and reception form, control the variable capacitance diode converted channel and utilize digital potentiometer to carry out the volume adjusting with digital potentiometer, and use the light-emitting diode display indicated channel, realized the unification of the performance of receiver superior and low cost and miniaturization.Use its people to enter tourist district, can make things convenient for the related voice information of selecting channel and tourist attractions thereof freely.This is not only highly beneficial to promoting the use of of tourist industry, and also is a kind of inexpensive renewal product with regard to common pocket radio set manufacturing.It will play strong impetus to China's tourist industry.This is a kind of extraordinary guide's instrument for independent tour person on the one hand, for tourist group, also is replenishing of a kind of good guide's facility on the other hand.

(4) description of drawings

Fig. 1 comprises Fig. 1 a and Fig. 1 b.Wherein Fig. 1 a is transmitter principle figure of the present utility model; Fig. 1 b is the utility model receiver principle figure;

Fig. 2 is that transmitter of the present utility model is specifically implemented circuit connection diagram;

Fig. 3 is that receiver of the present utility model is specifically implemented circuit connection diagram.

(5) embodiment

Referring to Fig. 1, i.e. Fig. 1 a and Fig. 1 b.The utility model is made up of many transmitters and many receivers of number.Every transmitter comprises that monolithic frequency modulation emission integrated circuit 4, vibration go the same way 5, frequency-selecting amplifying return circuit 6, power amplification loop 7 and voltage supply loop 2.Every receiver comprises FM radio reception application-specific integrated circuit (ASIC) 14, power amplification loop 13, volume regulating loop 15, channel selection loop 11, channel show circuit 12 and power supply supply loop 9.Described transmitter is that the audio signal that will comprise voice 1 broadcast of voice module, CD, disk, microphone inserts monolithic frequency modulation emission integrated circuits 4 by interface 3, monolithic frequency modulation emission integrated circuit 4 again with oscillation circuit 5, frequency-selecting amplifying return circuit 6 joins and obtains the 72MHz radiofrequency signal, frequency-selecting amplifying return circuit 6 joins with power amplification loop 7 and launches from antenna through output matching network 8, power supply supply loop 2 is to whole loop power supply, as shown in Figure 1a.Described receiver receives radiofrequency signal by input circuit 10 through antenna and inserts FM radio reception application-specific integrated circuit (ASIC) 14, and FM radio reception application-specific integrated circuit (ASIC) 14 joins with volume control loop 15 and power amplification loop 13 respectively, and by earphone or loud speaker output voice.Channel selection loop 11 joins with FM radio reception application-specific integrated circuit (ASIC) 14 and channel show circuit 12, and FM radio reception application-specific integrated circuit (ASIC) 14 also joins with channel show circuit 12 and controls the channel demonstration, and power supply supply loop 9 is to whole loop power supply, shown in Fig. 1 b.

Referring to Fig. 2, the monolithic frequency modulation emission integrated circuit MC2831A that uses Motorola Inc. to produce in every transmitter loop of the utility model, on behalf of IC3, this circuit module comprises audio frequency amplifier, voltage controlled oscillator and fm modulation circuit etc. among the figure.Audio signal from speech chip or CD, tape, microphone, 5 pin that are coupled to IC3 through capacitor C 201, resistance R 201 and R203 interface circuit carry out the audio frequency amplification, audio signal after the amplification is sent into 3 pin of IC3 and the inner variable reactance of 2 foot control systems through resistance R 202, capacitor C 202, capacitor C 203 and resistance R 204, carries out frequency modulation(FM).Set quartz oscillator B in the loop, its frequency of oscillation is that 24MHz becomes the local oscillator loop with inductance L 201, capacitor C 204 mutual group, signal after the modulation is exported from 14 pin through the IC3 internal buffer, be coupled to triode VT1 through capacitor C 205, triode VT1 is a frequency selective amplifier, frequency-selective network is formed antiresonant circuit by frequency converter T201 and capacitor C 207, and resonance frequency is 3 times 24MHz, i.e. 72MHz.This radiofrequency signal is coupled to triode VT2 by the secondary coil of frequency converter T201 and carries out power amplification.When set high frequency choke coil L203 in the loop, its loss resistance work at triode VT2, provide a base stage back bias voltage, make triode VT2 be in the Class C magnifying state triode VT2.Capacitor C 208, C209 and inductance L 202 are formed power amplifier input matched filter network.Inductance L 203, capacitor C 211 and C212 form the output matched filter network.Capacitor C 210 is a high-frequency bypass capacitor, and inductance L 204 is a high frequency choke coil.Radiofrequency signal after the amplification is exported through antenna.

Stabilized voltage power supply adopts the TNY255P super-small size switch power module that U.S. POWER INTEGRATIONS company produces in this loop, among the figure on behalf of IC1.This module integrates MOS power switch, control circuit and various protective circuit, and its switching frequency is 130KHz, exchanges the wide 85V-265V of input range, and direct current output is stable, and ripple coefficient is little.The 220V alternating current after circuit C101 and C102, resistance R 101 and inductance L 101 Π shape filtering, becomes about 300V left and right sides direct current again through diode D101, D102, D103, D104 full-wave rectification.Transformer T101 is energy storage inductor both, isolates transformation again.Metal-oxide-semiconductor polyphone in the elementary and IC1 of transformer T101 is formed clamp circuit by resistance R 102, capacitor C 103, diode D105, when preventing that metal-oxide-semiconductor from ending, produces high pressure and causes metal-oxide-semiconductor to damage.Form the secondary current rectifying and wave filtering circuit by diode D106, capacitor C 105, inductance L 102, the 130KHz exchange conversion is the output of 9V direct current.Set photoelectrical coupler LTV817 module in the loop on behalf of IC2, is formed sample circuit with voltage-stabiliser tube Dz and resistance R 103 among the figure.Capacitor C 104 is the storage capacitor of IC1 internal auxiliary power supply, and when guaranteeing that metal-oxide-semiconductor ends, IC1 is still in running order.

Referring to Fig. 3, the electronic tuning monolithic FM radio reception application-specific integrated circuit (ASIC) TDA7088T that uses PHILIPS Co. to produce in the utility model receiver loop, among the figure on behalf of IC4.This circuit module also have mixing, local oscillator, in put, amplitude limit, frequency discrimination, noise elimination, electronic tuning, frequency lock, and AFC circuit etc.This circuit adopts 70KHz as intermediate frequency, carries out frequency-selecting by the RC active filter, has adopted the FLL technology that the intermediate frequency signal bandwidth is compressed simultaneously, to guarantee the restriction to the 70KHz intermediate frequency.

Radiofrequency signal is advanced 11 pin of IC4 through antenna ANT coupling capacitance C5, send into mixting circuit, form the local oscillator resonant tank by the variable capacitance diode in variable capacitance diode BB910 and oscillator coil L1 or L2 and the IC4, the local oscillation signal that it produced also enters mixting circuit, radio frequency and local oscillator mixing are after produce intermediate-freuqncy signal after the intermediate-frequency filter filtering, intermediate-frequency filter is by capacitor C 6, C7, C12, C13 and IC4 internal circuit are formed, this intermediate-freuqncy signal is again through amplitude limit, enter the phase-shift network of forming by capacitor C 2 and internal circuit, to intermediate frequency signal phase shift 90, send into frequency discriminator then, the audio signal that frequency discriminator demodulates, from the 2 pin output of IC4, be coupled to 3 pin of digital potentiometer X9511W again through capacitor C 17 behind squelch switch, digital potentiometer X9511W is in the drawings on behalf of IC6.Audio signal from the output of 5 pin, is admitted to the power amplification loop of being made up of triode VT1 and VT2 and promotes earphone work after IC6 adjusts.Control end 1,2 pin of IC6 join with set inching button switch " VOL+ " and " VOL-" respectively, press this two button input pulses, and promptly the 5 pin output voltages of scalable IC6 reach the purpose of regulating volume.In addition, there is automatic search circuit IC4 inside, is provided with two inching button switch S CAN in the loop and is serially connected in the local oscillator loop and the base stage junction of triode VT3 and triode VT4.When pressing inching button switch " SCAN+ " button, 15 pin of IC4 and power supply "+" are connected and are high potential, when pressing inching button switch " SCAN-", power supply "+" is by the triode VT5 after saturated, 15 pin of IC4 also are connected to high potential, the S end of the inner rest-set flip-flop of IC4 this moment is by set, at this moment constant current is to capacitor C 1 charging, one end of capacitor C 1 is connected to variable capacitance diode BB910, so the charging voltage value of capacitor C 1 will change the capacitance of resonant tank, search for automatically thereby change local frequency.After receiving the strong signal of a certain radio frequency, the inner testing circuit of IC4 is just exported a control signal with the upset of rest-set flip-flop R end set trigger, will stop the charging of capacitor C 1, and the AFC system starts working simultaneously, be locked on the received frequency, thereby reached tuning purpose.The other end of capacitor C 1 is connected to output 5 pin of set digital potentiometer X9511, and digital potentiometer X9511 is in the drawings on behalf of IC5.Therefore the charge value of capacitor C 1 has been subjected to the control of IC5, and IC5 has just controlled the local frequency scope like this.After pressing inching button switch " SCAN+ " button, triode VT3 saturation conduction, negative pulse of 1 pin input of IC5, its 5 pin current potential raises; After pressing inching button switch " SCAN-" button, triode VT4 saturation conduction, negative pulse of 2 pin input of IC5, its 5 pin current potential reduces.So just controlled the charging voltage value of capacitor C 1, thereby the control local frequency has controlled the channel scope that receives then by IC5.After pressing inching button switch " SCAN+ " button, with two forward-backward counter CC4029 that are connected in the loop, in the drawings on behalf of IC7 and IC8, positive pulse appears in its input end of clock 15 pin, because this moment, its 10 pin was that high potential forward-backward counter IC7 and IC8 are in " adding " state, therefore make plus coujnt; After pressing inching button switch " SCAN-" button, triode VT4 saturation conduction, its 10 pin is an electronegative potential, forward-backward counter IC7 and IC8 are in " subtracting " state, triode VT5 saturation conduction, input end of clock 15 pin input positive pulse, forward-backward counter subtraction.Its 7 pin is the carry output, and its 5 pin is a carry input, its 9 pin ground connection, and forward-backward counter is in the BCD count status.From the binary-coded decimal of 6,11,14,2 pin of IC7 and IC8 output, send into loop-coupled two latch/decipher/driver module CC4511 latchs, 7 sections decipher and drive two one 7 n segment display n LED1 and LED2 shows.Two latch/decipher/driver module CC4511 is in the drawings on behalf of IC9 and IC10.

Because the input pulse of the inner rest-set flip-flop of IC4, the control impuls of digital potentiometer IC5, and the count pulse of forward-backward counter IC7 and IC8, all be the same pulse of sending, so just guaranteed that the tuning locking of channel and channel displayed number concern one to one by inching button switch " SCAN+ " and " SCAN-" button.

This receiver power supply adopts the 3V DC power supply, and channel is set to 30, and guide's frequency is 72--72.725MHz, each channel spacing 25KHz.Set K switch 2 can be moved K switch 2 conversion on demand and listen to program for guide's wave band and FM broadcasting section change over switch in the loop.

Claims

1, a kind of radio guide device that utilizes radio transmission and reception, it is made up of many transmitters and many receivers of number; Described transmitter comprises the monolithic frequency modulation emission integrated circuit of being made up of audio frequency amplifier, voltage controlled oscillator and frequency interleaved modulation modulator (4), oscillation circuit (5), frequency-selecting amplifying return circuit (6), power amplification loop (7) and power supply supply loop (2); Described receiver comprises the electronic tuning monolithic FM radio reception application-specific integrated circuit (ASIC) of being made up of intermediate frequency amplifier, amplitude limiter, frequency discriminator (14), power amplification loop (13), volume regulating loop (15), channel selection loop (11), channel show circuit (12) and power supply supply loop (9); It is characterized in that: to be the audio signal broadcasted of the voice (1) that will comprise voice module, CD, disk, microphone insert model by interface (3) to described transmitter is that the monolithic frequency modulation of MC2831A is launched integrated circuit (4), this monolithic frequency modulation emission integrated circuit (4) again with oscillation circuit (5), frequency-selecting amplifying return circuit (6) joins and obtains the 72MHz radiofrequency signal, and frequency-selecting amplifying return circuit (6) joins with power amplification loop (7) and launches from antenna through output matching network (8); Described receiver receives radiofrequency signal by input circuit (10) through antenna and inserts FM radio reception application-specific integrated circuit (ASIC) (14) and the local oscillation signal intermediate-freuqncy signal of mixing generation 70KHz mutually that model is TDA7088T, amplify through intermediate frequency, amplitude limit, the audio detection signal inserts volume regulating loop (15) and power amplification loop (13) respectively and by earphone or loud speaker output voice behind the frequency discrimination, channel selection loop (11) and FM radio reception application-specific integrated circuit (ASIC) (14), channel show circuit (12) joins, and FM radio reception application-specific integrated circuit (ASIC) (14) also joins with channel show circuit (12) and controls the channel demonstration.

2, according to the described radio guide device of claim 1, it is characterized in that: it is that the switch power module of TNY255P inserts halfwave rectifier loop output dc voltage again for each loop use that the power supply supply loop (2) of described transmitter adopts civil power to insert model after full-wave rectification.

3, according to claim 1 or 2 described radio guide devices, it is characterized in that: the volume regulating loop (15) of described receiver is that digital potentiometer and two inching button switch VOL of X9511W form by model; The high potential input and the TDA7088T application-specific integrated circuit (ASIC) output of digital potentiometer join, and its output voltage control end joins with inching button switch VOL respectively, and its output and described power amplification loop (13) input join.

4, according to the described radio guide device of claim 3, it is characterized in that: the channel selection loop (11) of described receiver is that digital potentiometer and two inching button switch S CAN of X9511 form by model; The output voltage control end and the set capister BB910 of digital potentiometer join, and make variable capacitance diode BB901 present different capacitances; Variable capacitance diode BB910 and set K switch 2 are joined, and select channel change by the be connected in parallel local oscillator loop of the different FM radio reception application-specific integrated circuit (ASIC) of component frequency of K switch 2 and set oscillator coil L1 or L2.

5, according to the described radio guide device of claim 4, it is characterized in that: the channel show circuit (12) of described receiver be by the binary-coded decimal that two models binary-coded decimal reversible counting integrated circuit that is CC4029 and two models are CC4511 latch/display serial connection that 7 sections decoding/driver ICs and two models are LED5011 forms.