CN2250615Y - infrared wireless loudspeaker box - Google Patents

Abstract

The utility model relates to a sound box, particularly a sound box which is not connected by wires and uses infrared for transmitting audio signals. The sound box using wires for the transmission can be conveniently placed. The utility model uses infrared subcarrier waves for carrying out the audio signal transmission, and the front part of a loud speaker is provided with an infrared sensor. Infrared modulation signals sent by an infrared transmitter of a host machine can be used for demodulating the audio signals, and the loud speaker can be pushed to sound. The infrared wireless sound box can be made into the sound boxes of different tuning frequency for receiving the audio signals of different systems and even various stereophonic signals according to the different transmitting signal modulation frequency of the infrared transmitter, and the utility model can be used conveniently.

Description

The infrared radio audio amplifier

The utility model relates to a kind of audio amplifier, particularly a kind ofly need not connect lead, utilizes the audio amplifier of infrared transmit audio signals.

At ordinary times, people listen to the audio signal of audio-visual devices outputs such as television set, video recorder, advanced audio, need lead to connect audio amplifier usually and play.Because the existence that connects lead is arranged, and distance of listening to and space etc. are very restricted, what also influence easily and stand in other's way walks about.

The purpose of this utility model provides a kind of audio amplifier, both can save the transmission lead, and convenient ornaments can guarantee the quality of listening to again.

To achieve these goals, the utility model is loaded onto an infrared remote receiver in the preposition part of loudhailer, and by infrared remote receiver, the infrared modulated signal that sends from the main frame infrared transmitter demodulates audio signal, promotes the loud speaker sounding.The circuit bank of infrared remote receiver becomes: infrared sensing circuit 1, filter circuit 2, buffer circuit 3, high-frequency amplifier circuit 4, tuning and frequency-discriminating circuit 5, low frequency pre-amplification circuit 6, deaccentuator 7, power amplification circuit 8, above circuit is linked in sequence, one no signal automatic shutdown circuitry 9, the power supply of power controlling amplifying circuit 8 are installed between tuning and frequency-discriminating circuit 5 and power amplification circuit 8.According to the transmit difference of modulating frequency of infrared transmitter, this infrared radio audio amplifier can be corresponding with it, forms the different audio amplifier of tuned frequency, receives the audio signal of various different systems, even various stereophonic signal.Carry out audio signal transmission owing to adopt infrared carrier signal, needn't connect by lead, make the ornaments of audio amplifier not be subjected to the restriction of transfer wire, as long as in the scope that the infrared modulated signal can be mapped to, all can be satisfied with and receive the signal that will receive, the user can arbitrarily furnish.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the circuit theory diagrams of infrared radio audio amplifier.

Among Fig. 1, infrared-sensitive diode D ₁～D ₃With C ₇Being connected in parallel constitutes infrared sensing circuit 1, and it is two the tunnel through inductance L ₂And half variable capacitance VC ₁Advance buffer transistor Q ₁Grid, Q ₁Grid simultaneously by L ₃With C ₂Parallel connection is landed, L ₂With VC ₁And L ₃With C ₂Two series resonant network constitute selective frequency filter circuit 2, Q ₁And biasing circuit constitutes buffer circuit 3; Q ₁Source electrode through R ₂With C ₄L is gone here and there in parallel connection again ₄Land, signal by its intermediate contact through C ₅Be coupled to the transistor Q of high-frequency amplifier circuit 4 ₂Base stage, R ₅Be Q ₂The feedback biasing resistor, R ₄Be Q ₂Emitter resistance, L ₅Be Q ₂The collector load inductance, signal is from Q ₂Collector electrode output through coupling capacitance C ₁₁To tuning frequency discrimination integrated circuit (IC) ₁The 13rd pin, by IC ₁And peripheral cell constitutes tuning and frequency-discriminating circuit 5, low frequency pre-amplification circuit 6, finishes functions such as high-frequency tuning, mixing, local oscillator, intermediate frequency amplification, frequency discrimination, AFC, low frequency amplification, IC ₁The 3rd pin meets 10.7MHZ ceramic resonator X ₁And R ₁₁Land, the 8th pin connects by C ₈, L ₁₁The series resonant network of forming produces local frequency, and the 10th pin connects by series resonant network L ₁₂, C ₁₆The resonant tank of forming, the 15th pin meets R ₁₆And ceramic filter X ₂, be connected to the AFC resistance R between the 7th pin and the 22nd pin ₁₄, the signal after low frequency amplifies is through IC ₁The 28th pin output, by C ₃₀Coupling is through R ₁₆, C ₃₁, C ₃₂The deaccentuator of forming 7 is again through C ₃₇Coupling meets R ₂₇With C ₃₉Parallel network enters volume potentiometer VR ₂Land VR ₂Two ends and meet bass accentuator C ₄₁, C ₄₂, R ₂₈, travelling arm is through C ₄₃The integrated circuit (IC) of ingoing power amplifying circuit 8 ₂The 8th pin; IC ₂Be an audio power amplifying circuit, be connected into BTC and amplify mode that the signal after amplifying is by IC ₂The 2nd pin and the output of the 11st pin promote loud speaker; IC ₁The signal of the 20th pin via D ₆, D ₇, C ₃₄The current rectifying and wave filtering circuit of forming obtains a direct current voltage, through R ₁₉And by Q ₃, Q ₄, Q ₅The direct switching circuit formed of coupling plays the Q of on-off action ₅Emitter meet positive source VC, collection utmost point IC ₂Power supply is imported the 12nd pin, constitutes no signal automatic shutdown circuitry 9, control IC ₂Power input.DC power supply VC is through Q ₆, D ₉, C ₅₁Voltage regulation filtering provides V ₁Voltage is for Q ₁, Q ₂, Q ₃And IC ₁Power supply.

During concrete enforcement, L ₁Select 39 μ H, C ₇Select 47PF, L ₂Select 88 μ H, L ₃Select 82 μ H for use, select 56PF for use, L ₁₁Select 3.9 μ H for use, L ₁₂Select 82 μ H for use, C ₈Select 22Pf for use, C ₁₆Select 47Pf for use, X ₁Select the 10.7MHZ ceramic filter for use, X ₂Select the 10.7MHHZ ceramic filter for use, Q ₃, Q ₄Select BC547 for use, Q ₅Select A1020 for use, IC ₁Select CXA1191S for use, IC ₂Select LA4555 for use, VC is the 6V DC power supply.

Claims (2)

1, a kind of infrared radio audio amplifier, it is characterized in that loading onto an infrared remote receiver in the preposition part of loud speaker, the circuit bank of infrared remote receiver becomes: infrared sensing circuit 1, filter circuit 2, buffer circuit 3, high-frequency amplifier circuit 4, tuning and frequency-discriminating circuit 5, low frequency pre-amplification circuit 6, deaccentuator 7, power amplification circuit 8, above circuit is linked in sequence, and one of peace can be adorned the automatic shutdown circuitry 9 of the power supply of control dress power amplification circuit 8 between tuning and frequency-discriminating circuit 5 and power amplification circuit 8.

2, a kind of infrared radio audio amplifier as claimed in claim 1 is characterized in that the circuit of described infrared remote receiver is connected to: infrared-sensitive diode D ₁～D ₃Negative terminal with meeting positive source V ₁, anode is with connecing inductance L ₁Land anode and L ₁Tie point divide two the tunnel through L ₂And half variable capacity VC ₁Enter buffer transistor Q ₁Grid, Q ₁Source electrode through R ₂With C ₄L is gone here and there in parallel connection again ₄Land, signal by its intermediate contact through C ₅Be coupled to high frequency amplifier transistor Q ₂Base stage, signal is by Q ₂Collector electrode output through C ₁₁Be coupled to tuning frequency discrimination integrated circuit (IC) ₁The 13rd pin, the audio signal after tuning, frequency discrimination and low putting is by IC ₁The output of the 28th pin is through C ₃₀Be coupled to deaccentuator R ₁₆, C ₃₁, C ₃₂, again through C ₃₇Coupling meets R ₂₇With C ₃₉Parallel network enters volume potentiometer VR ₂Land VR ₂Travelling arm through C ₄₃Ingoing power amplification circuit IC ₂The 8th pin, the audio signal after amplifying is by IC ₂The 2nd pin and the 11st pin output promote loud speaker; IC ₁The signal of the 20th pin via D ₆, D ₇, C ₃₄Behind the current rectifying and wave filtering circuit of forming, through R ₁₉Connect by Q ₃, Q ₄, Q ₅The direct switching circuit formed of coupling, Q ₅Emitter meets positive source VC, and collector electrode meets IC ₂Power supply import the 12nd pin.