CN2369420Y - Wire audio frequency receiver - Google Patents

Abstract

The utility model relates to a wire broadcast audio frequency receiver, comprising a single-channel tuning circuit for amplifying intermadiate frequency and discriminating phase, a managing code demodulating circuit, a microprocessor control input device, an LED display circuit, a multi-channel tuning circuit for amplifying intermadiate frequency and discriminating phase, an audio frequency power amplifying circuit, a loudspeaker and a power circuit. Through demodulation, one path of audio modulated signals and managing code modulated signals input from a wire broadcast signal source outputs managing codes outputting control codes through the microprocessor, and the other path outputs audio signals; the output control codes control the audio signals to select channels. Functional control and management are carried on the receiver, so that wire audio broadcast can realize services with high tone quality, multiple channels and multiple functions.

Description

The wireline audio receiver

The utility model relates to a kind of wired broadcasting apparatus for receiving audio.

Radio broadcasting and wired broadcast system are widely used, but its function singleness, utilization transmits control signal simultaneously and reaches then not appearing in the newspapers in terminal recognition and management in the wire transmission broadcast singal.Raising along with the development of communication broadcast and human material, cultural life quality, on the basis of radio broadcasting, utilization transmits control signal and multi channel audio signal simultaneously in the wire transmission broadcast singal, reach at receiving terminal and discern and manage, realize that multi-functional, the multiduty purpose of wired broadcasting has become human wants.

The purpose of this utility model aims to provide a kind of folding and unfolding sound function that both had, can carry out demodulation to the supervisory signal of the secondary modulation that contains in the wire transmission signal again, to reach the wireline audio receiver of the telemanagement formula multi-purpose that receives multi channel audio signal and discern and manage at receiving terminal.

The utility model by put in the single channel tuning and phase discriminator, overhead code demodulator circuit, microprocessor and control input device, LED display circuit, multichannel tuning (channel selection) in put with phase discriminator, audio power amplifier circuit, loud speaker and power circuit and form.Put in the single channel tuning and phase discriminator comprises single channel tuning circuit, intermediate level circuit and phase discriminator, the terminal interface of the external wired broadcast signal source transmission line of harmonic ringing input of single channel tuning circuit, input is from the audio modulation signal and the overhead code modulation signal of wired broadcast transmitted line, the input of the output termination intermediate level circuit of single channel tuning circuit; The input of the output termination phase discriminator of intermediate level circuit, the phase discriminator output connects the input of overhead code demodulator circuit, phase discriminator output audio signal and overhead code modulation signal.The I/O port of the overhead code output termination microprocessor of overhead code demodulator circuit, microprocessor is from the overhead code of I/O port input through demodulation, through microprocessor identification with handle after the modulation control code be connected to multichannel by the I/O port of microprocessor and put with the tuning circuit input of phase discriminator in tuning and control and channel selection, put with phase discriminator during multichannel is tuning and comprise tuning circuit, intermediate level circuit and phase discriminator, the terminal interface of the also external wired broadcast signal source transmission line of tuning circuit input, the input of the output termination intermediate level circuit of tuning circuit, the input of the output termination phase discriminator of intermediate level circuit, the output output audio signal of phase discriminator is connected to the input of audio power amplifier circuit, the output termination loud speaker of audio power amplifier circuit.Said control input device is connected with the I/O port of microprocessor, input control signal and receiver user's out of Memory, and carry out implementing its management again after the integrated treatment, control input device can be established remote controller, keyboard etc.The I/O port of the input termination microprocessor of light-emitting diode display.Power circuit is connected to the power supply power supply input of each circuit of receiver.

The utility model not only has the folding and unfolding sound function to wired broadcasting, and can carry out demodulation to the overhead code (signal) of the secondary modulation that contains in the cable broadcasting signal, simultaneously with identification and the logical process of these supervisory signals by microprocessor, the receipts that achieve a butt joint machine carries out functional control and management, make it to have Auto Power On, shutdown, automatic frequency switches, standard time function such as give the correct time, it is anti-interference that closed circuit (wired) audio broadcasting is realized, high tone quality, multichannel, multi-functional, the purpose of multipurpose service forms complete broadcasting and TV service network with closed-circuit.

Fig. 1 is a structure composition frame chart of the present utility model.

Fig. 2 is put and the phase discriminator schematic diagram in the single channel tuning of the present utility model.

Fig. 3 is an overhead code demodulator circuit schematic diagram of the present utility model.

Fig. 4 is the microcontroller circuit schematic diagram of utility model.

Fig. 5 is put and phase discriminator and audio power amplifier circuit and loud speaker schematic diagram in tuning for multichannel of the present utility model.

Fig. 6 is power circuit principle figure of the present utility model.

Below with regard to structure of the present utility model form, circuit theory provides an embodiment.

As shown in Figure 1, the utility model is by putting in the single channel tuning and phase discriminator 1, overhead code demodulator circuit 2, microprocessor 3 and control input device 4, LED display circuit 5, multichannel are put with phase discriminator 6, audio power amplifier circuit 7, loud speaker 8 and power circuit 9 in tuning and formed.Put and phase discriminator in the single channel tuning, put during multichannel is tuning with the harmonic ringing input RFIN1 of phase discriminator and RFIN2 and all be connected with terminal interface from cable broadcasting signal source transmission line, input audio modulation signal and overhead code modulation signal, put in the single channel tuning and phase discriminator to a certain channel tuning, in put and phase demodulation after by phase discriminator output output audio signal and overhead code modulation signal, realize a demodulation, this signal obtains overhead code through the secondary demodulation of overhead code demodulator circuit, overhead code output termination microprocessor, microprocessor is controlled by control input device, through identification with logical process after by the I/O port, one the tunnel is connected to the LED display circuit, one tunnel output modulation control code is put and phase discriminator in the channel tuning at the most, it is controlled, management such as tuning grade, make it to export the signal of desired certain station channel of user, after audio power amplifier circuit amplifies, listen to again.

As shown in Figure 2, put in the single channel tuning and phase discriminator by triode Q ₁, integrated circuit (IC) 1 (CXA1191M) and auxiliary element thereof form, audio modulation signal and overhead code modulation signal by RFIN1 end input cable broadcasting signal source, in IC1, carry out the demodulation first time, again the IN end (referring to Fig. 3) of sending into the overhead code demodulator circuit from the 23rd pin (TP5) end output complex modulated and the restituted signal of IC1.The overhead code demodulator circuit is by triode Q ₂, Q ₃Form with integrated circuit (IC) 2 (LM567), IC3 (LM386) and other auxiliary elements,, obtain the overhead code (signal) with microprocessor (see figure 4) signal compatibility, from Q to after carrying out secondary demodulation from the complex modulated of IN end input and restituted signal and handling ₃The C utmost point (being the 3rd end of socket J1001) export the socket J of microprocessor to ₃The 1st end, and deliver to single-chip microcomputer U ₁The 2nd pin (89C2051).Q ₂With IC ₂Play impedance matching, tuning and secondary demodulation, IC ₃Be shaping circuit, Q ₃Be amplifying circuit.Microprocessor is by single-chip microcomputer U ₁, integrated circuit U ₂～U ₄(74HC573), U ₅(74LS244), U ₆(74LS138), U ₇～U ₁₁(4052), U ₁₂(74LS138), U ₁₃(X9313) and triode T ₁～T ₅And other auxiliary elements are formed.U wherein ₂～U ₆And U ₁₂Be the expanded circuit of microprocessor, U ₇～U ₁₁Be the control transformation circuit.The user profile of control input device is by socket J ₄Input is again through U ₁P1 mouth input, through U ₁Modulation control code after identification and integrated logic are handled is by socket J ₁₀Export multichannel to and put socket J1010 (see figure 5) with phase discriminator in tuning, integrated circuit (IC) 201 is carried out channel selection control.Put during multichannel is tuning with phase discriminator by integrated circuit (IC) 101 (CXA1238S), IC201 (μ PD1715G-014), triode T101～T111, T201～T210 and auxiliary element thereof are formed, and put in its input RFIN2 and the single channel tuning and the same terminal interface that is connected to the cable broadcasting signal source of RFIN1 of phase discriminator.Under the management of above-mentioned microprocessor, through tuning, in put and phase demodulation, the audio signal of its output is sent into audio power amplifier circuit (seeing IC102 (TDAB122M) and the auxiliary circuit thereof of Fig. 5) and is carried out power amplifier, and is raised one's voice to its utmost by loud speaker B101.In Fig. 5, IC101 plays to be put and the phase demodulation effect in tuning, and IC301 (TA8126F) is an electric pressure converter, and IC201 is a control circuit.In Fig. 4, through socket J ₅Output information shows to display (summary).

Fig. 6 provides the power circuit of embodiment, is circuit commonly used, and it illustrates slightly.

Claims (1)

1. wireline audio receiver is characterized in that by putting in the single channel tuning and phase discriminator, overhead code demodulator circuit, microprocessor and control input device, LED display circuit, multichannel are put with phase discriminator, audio power amplifier circuit, loud speaker and power circuit in tuning and formed;

Put in the single channel tuning and phase discriminator comprises single channel tuning circuit, intermediate level circuit and phase discriminator, the terminal interface of the external wired broadcast signal source transmission line of harmonic ringing input of single channel tuning circuit, input is from the audio modulation signal and the overhead code modulation signal of wired broadcast transmitted line, the input of the output termination intermediate level circuit of single channel tuning circuit, the input of the output termination phase discriminator of intermediate level circuit, the phase discriminator output connects the input of overhead code demodulator circuit, phase discriminator output audio signal and overhead code modulation signal;

The I/O port of the overhead code output termination microprocessor of overhead code demodulator circuit, microprocessor is from the I/O port input overhead code through demodulation, through microprocessor identification with handle after the modulation control code be connected to multichannel by the I/O port of microprocessor and put with the tuning circuit input of phase discriminator in tuning and control and channel selection;

Put during multichannel is tuning with phase discriminator and comprise tuning circuit, intermediate level circuit and phase discriminator, the terminal interface of the external wired broadcast signal source transmission line of tuning circuit input, the input of the output termination intermediate level circuit of tuning circuit, the input of the output termination phase discriminator of intermediate level circuit, the output output audio signal of phase discriminator is connected to the input of audio power amplifier circuit, the output termination loud speaker of audio power amplifier circuit;

Said control input device is connected with the I/O port of microprocessor, input control signal and receiver user's out of Memory, and carry out implementing its management again after the integrated treatment;

The I/O port of the input termination microprocessor of light-emitting diode display;

Power circuit is connected to the power supply power supply input of each circuit of receiver.

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