CN2234155Y - Duplex howling-free amplifying device - Google Patents

Abstract

The utility model discloses a duplex does not have singing amplification device that uses in telephone communication equipment, it is including sending out (receiving) letter amplifier, sending out (receiving) letter attenuator, single tube power amplifier, two four-wire converting circuit, sending out (receiving) accuse amplifier, sending out (receiving) accuse attenuator, comparison circuit and audio switch circuit, its characteristics are to enable the installation the device phone concentrator adjust the sending and receiving volume at will to make the telephone exchange host computer conversation have no jamming, fall word and singing phenomenon.

Description

The no singing amplifying device of duplex

The utility model relates to a kind of application voice amplifier that uses in telephone communication set, specifically be that the duplex of installing in a kind of phone concentrator does not have the singing amplifying device.

In the prior art, communicating by letter in the Chengdu money has this similar amplifying device in the JHT type phone concentrator that factory's (being subordinate to the Ministry of Railways) produces, and extensive use, it comprises: (being subjected to) believes that amplifier, (being subjected to) letter attenuator, single tube power amplifier, two or four line change-over circuits, (being subjected to) are controlled amplifier, (being subjected to) controls attenuator and voice operated switch circuit and comparison circuit, but reflect generally that according to the user there is following shortcoming in this device.First: the outside line incoming level of direct circuit loop line and numerical selection loop line differs greatly, the conversation of direct circuit loop line is normal, numerical selection phone loop line is little with regard to sound, if the words that are subjected to of numerical selection phone loop line are transferred to normal condition, the direct circuit loop line is conversed with regard to singing, can't be used.Second: deliver letters output level and its trusted sensitivity apart from the phone concentrator numerical selection loop line of relay station far-end are difficult to take into account, when when being talked about output level and be transferred to rated value, trusted amplifier output level must reduce, do not reach rated value, it is little to be talked about sound, otherwise can cause singing, the card sound, otherwise, perfect condition is transferred in trusted sensitivity, must be sending the words output level to reduce, make and send words sound to diminish, this amplifying circuit in use is difficult to be transferred to perfect condition in a word, even the optimum degree of being transferred to, also be difficult to reach technical indicator, cause exchange host card sound often, fall word, singing phenomenon.

The purpose of this utility model is to provide a kind of arbitrarily adjusting of using in telephone communication to send two no singing amplifying devices mutually of talking about and being subjected to the speech amount, and this device can make total machine host conversation not have the sound of card, fall word and singing phenomenon.

Scheme of the present utility model is as follows: it comprises,

1-transmitting amplifier, the 2-attenuator of posting a letter, 3-single tube power amplifier, 4-two four line change-over circuits, 5-trusted attenuator, 6-trusted amplifier, a 7-control attenuator, a 8-control amplifier, 9-comparison circuit, 10-voice operated switch circuit, 11-controlled attenuator, 12-controlled amplifier.

The amplifying device basically identical of electrical connection between above-mentioned each element circuit and prior art JHT type phone concentrator is characterized in that:

The described attenuator of posting a letter is: the inferior utmost point 4,6 ends by transmitting amplifier output transformer B meet two utmost point villous themeda D respectively ₁, D ₂Positive pole, D ₁, D ₃Negative pole be connected on the input transformer B of single villous themeda power amplifier respectively ₂1,3 ends of the first utmost point, and B ₁The centre tap 5 of the transformer time utmost point is connected to controlled attenuator D ₁₃, D ₁₄Negative pole, transformer B ₂Just the centre tap 2 of polar curve circle terminates at and sends out control switch villous themeda BG ₆Collector electrode C.

Described trusted attenuator is: by two or four line change-over circuit output transformer B ₅4,6 ends of the inferior utmost point meet two utmost point villous themeda D respectively ₁₁, D ₁₂Positive pole, D ₁₁, D ₁₂The negative pole input transformer B of letter of acceptance amplifier respectively ₆1,3 elementary ends, B ₆Elementary centre tap 2 is connected to voice operated switch BG ₈Collector electrode C.

Described control attenuator is: by B ₁The transformer time utmost point 7,8 between be connected to forward two utmost point villous themeda D of polyphone ₃With reverse two utmost point villous themeda D ₄, at B ₁7,8 ends between also be connected to reverse two utmost point villous themeda D of polyphone ₅With forward two utmost point villous themeda D ₆, D ₅, D ₆Positive pole meet capacitor C respectively ₂₀Positive pole and the negative pole of light-emitting diodes villous themeda, sending out earlier, two utmost point villous themeda positive poles connect positive source, capacitor C ₂₀The input transformer B of negative pole sending and receiving control amplifier ₃Centre tap 2 ends of the first utmost point, B ₁7,8 ends of the inferior utmost point simultaneously also with B ₃Just 1,3 ends of the utmost point join.

Described control amplifier is: the output transformer B that sends out the control attenuator ₃5,6 ends of the inferior utmost point, 6 end ground connection wherein, 5 are connected to capacitor C ₁₉Positive pole, C ₁₉Negative pole be connected to BG ₄Base stage carry out single villous themeda power amplification, amplifying signal is through transformer B ₄Export the input A of comparison circuit after the coupling to.

Described voice operated switch circuit is that the output by comparison circuit is connected to BG respectively ₅, BG ₇Base stage, more respectively by BG ₅, BG ₆And BG ₇, BG ₈Form the two poles of the earth dc amplification circuit.

Described controlled attenuator is: at the output transformer B of two or four line change-over circuits ₅Between 7,8 ends of the inferior utmost point, insert forward two utmost point villous themeda D that are chained together ₁₃With reverse two utmost point villous themeda D ₁₄, at B ₅7,8 ends between, also be connected to two utmost point villous themeda D that are chained together ₁₅With forward two utmost point villous themeda D ₁₆, again by D ₁₅, D ₁₆Forward termination capacitor C ₁₆Positive pole, C ₁₆Negative pole accept the input transformer B of control amplifier ₇Centre tap 2 ends of the first utmost point, B simultaneously ₅7,8 ends respectively with B ₇Just 1,3 ends of the utmost point join.

Described controlled amplifier is: the output transformer B of controlled attenuator ₇5,6 ends of the inferior utmost point, 6 end ground connection wherein, 5 termination capacitor C ₂₇Positive pole, C ₂₇Negative pole through BG ₉, BG ₁₀Output transformer B is exported to after amplifying in the two poles of the earth ₈1,3 ends of the first utmost point, B ₈The inferior utmost point 6 end ground connection, the input C of 5 termination comparison circuits.

The utility model has the advantages that:

1, send words level under distortionless situation, can adjust size arbitrarily, and not singing, fall word, the card sound.

2, be subjected to the speech amount can be, adjust arbitrarily, and not singing, block sound, fall word according to customer requirements.

3, the sound control circuit need not be adjusted, and is easy to maintenance.

4, simple, the cost saving of circuit and greatly facilitate the user in the use.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the utility model electricity structural representation block diagram.

Fig. 2 is an electrical connection graph of the present utility model.

As described in Figure 1, the utility model is made up of following unit.

1, transmitting amplifier 2, the attenuator 3 of posting a letter, single tube power amplifier 4,24 line change-over circuits 5, trusted attenuator 6, trusted amplifier 7, a control attenuator 8, a control amplifier 9, comparison circuit 10, voice operated switch circuit 11, controlled attenuator 12, controlled amplifier.

In conjunction with Fig. 2 principle of the present utility model is summarized as follows:

1, send the words loop

Speech produces voice signal, by BG through the electret transmitter ₁, BG ₂Carry out the two poles of the earth and amplify, through B ₁Transformer 1,2 coils are induced to B ₁7,8 ends, B ₁7 be connected to B ₃1 end of transformer, B ₁8 be connected to B ₃3 ends of transformer are by B ₃1,3 sense B ₃5,6 ends, through BG ₄Send out the control signal and amplify, the signal after the amplification is through B ₄1,3 ends of transformer are sensed B ₄5,6 ends, by B ₄5,6 ends induced signal is added to the A-B of comparison circuit, by comparison circuit compare, rectification delivers to the voice operated switch circuit and promotes BG ₅, BG ₆Conducting, power cathode is by BG ₆E, c → B ₂2 → B of transformer coil ₂1,3 → D ₁, D ₂Negative pole → D ₁, D ₂→ B ₁Transformer 4,6 ends → B ₁5 → controlled attenuator D ₁₃, D ₁₄Negative pole → D ₁₃, D ₁₄→ B ₅Transformer 7,8 ends → D ₁₅, D ₁₆Negative pole → D ₁₅, D ₁₆→ light-emitting diodes villous themeda negative pole → light-emitting diodes villous themeda → positive source, at this moment, attenuator two utmost point villous themeda forward conductions of posting a letter, to the signal loss minimum, controlled attenuator two utmost point villous themeda conductings, owing to be in parallel, attenuation is also maximum, voice signal is by B ₁Transformer 4,6 ends are to the attenuator D that posts a letter ₁, D ₂Positive pole, through D ₁, D ₂To B ₂1,3 ends of transformer are induced to B again ₂5,6 ends of transformer are through W ₁Potentiometer adds to single villous themeda power amplifier BG ₃Amplify, the signal after the amplification is sensed 1,3 ends of HQ transformer through HQ transformer 7,8 ends, through the conversion of two or four lines, delivers to outside line 12,13 ends, send words to stop each attenuator of back and recovers.

2, listening circuit

Outside line 12,13 end voice signals are changed through two or four lines, by the HQ coil 5,6 ends → B ₅Transformer 1,2 ends → B ₅Transformer 7,8 ends → B ₇Transformer 1.3 ends → B ₇5,6 ends, signal is again through capacitor C ₂₇Deliver to controlled amplifier, the signal after the amplification is by B ₈5,6 ends of transformer add to the comparison of C, B end, the rectification of comparison circuit, and the signal after the rectification promotes controlled switch BG ₇, BG ₈Conducting, power cathode is through BG ₈E, c → B ₆2 → B of transformer ₆1,3 → trusted attenuator D ₁₁, D ₁₂Negative pole, through D ₁₁, D ₁₂→ B ₅Transformer 4,6 ends → B ₅5 ends. → send out control attenuator D ₃, D ₄Negative pole, again through D ₃, D ₄→ D ₅, D ₆Negative pole → B ₁Transformer 7,8 ends → D ₅, D ₆The negative pole of → light-emitting diodes villous themeda, → light-emitting diodes villous themeda → positive source, at this moment, a control attenuator, trusted attenuator are in the conducting operating state, send out a control amplifier and can not work, and letter signal is through D ₁₁, D ₁₂To B ₆1,3 ends of transformer are coupled to 5,6 ends, again through potentiometer W ₂After give trusted amplifier loudspeaker.

Three, the sound control circuit is introduced

1, voice operated switch circuit

The voice operated switch circuit is by BG ₅, BG ₆, BG ₇, BG ₈Form Deng element, because comparison circuit is a half-wave rectifying circuit, need capacitor filtering, therefore if electric capacity is too big, switching speed is slow, can produce the word phenomenon; Too little, filtering is bad, influence switch performance, causes and send the trusted spoken sounds to pronounce indistinctly, and in order to solve this contradiction, is provided with the two-stage switch here, secondary filtering, and it is not slow to make it can not fall word and speed, can be not bad because of filtering yet, cause and pronounce indistinctly.

2, send out control, controlled attenuator

1. send out the control attenuator by D ₃, D ₄, D ₅, D ₆With capacitor C ₂₀Form.

2. controlled attenuator is by D ₁₃, D ₁₄, D ₁₅, D ₁₆With capacitor C ₂₆Form.

In order to guarantee the reliability of attenuator, be provided with the method for attachment of four two utmost point villous themeda series and parallels, send out control attenuator D ₃, D ₄Positive pole, meet D ₅, D ₆Negative pole, D ₃, D ₄Positive pole meet B simultaneously ₁7,8 ends of transformer.Controlled attenuator D ₁₃, D ₁₄Positive pole meet D ₁₅, D ₁₆Negative pole, D ₁₃, D ₁₄Negative pole meet B simultaneously ₅7,8 ends of transformer, capacitor is as time-delay.

3, post a letter, the trusted attenuator

1. post a letter and decline device by D ₁, D ₂Form.

2. trusted declines device by D ₁₁, D ₁₂Form.

When collecting mail, voice operated switch BG ₅, BG ₆Conducting, attenuator D posts a letter ₁₁, D ₁₂Forward conduction, the attenuator attenuation of posting a letter minimum.

When collecting mail, voice operated switch BG ₇, BG ₈Conducting, trusted attenuator D ₁₁, D ₁₂Forward conduction, trusted attenuator attenuation minimum.

Claims (1)

1, a kind of duplex that is installed on the phone concentrator does not have the singing amplifying device, it comprises, transmitting amplifier, the attenuator of posting a letter, single tube power amplifier, two or four line change-over circuits, trusted attenuator, trusted amplifier, a control attenuator, a control amplifier, comparison circuit, voice operated switch circuit, controlled attenuator, controlled amplifier is characterized in that:

The described attenuator of posting a letter is: by transmitting amplifier output transformer B ₁The inferior utmost point 4,6 ends meet two utmost point villous themeda D respectively ₁, D ₂Positive pole, D ₁, D ₂Negative pole be connected on the input transformer B of single villous themeda power amplifier respectively ₂1,3 ends of the first utmost point, and B ₁The centre tap 5 of the transformer time utmost point is connected to controlled attenuator D ₁₃, D ₁₄Negative pole, transformer B ₂Just the centre tap 2 of polar curve circle terminates at and sends out control switch villous themeda BG ₆Current collection C,

Described trusted attenuator is: by two or four line change-over circuit output transformer B ₅4,6 ends of the inferior utmost point meet two utmost point villous themeda D respectively ₁₁, D ₁₂Positive pole, D ₁₁, D ₁₂The negative pole input transformer B of letter of acceptance amplifier respectively ₆1,3 elementary ends, B ₆Elementary centre tap 2 is connected to voice operated switch BG ₈Collector electrode C,

Described control attenuator is: by B ₁The transformer time utmost point 7,8 between be connected to the forward diode D of polyphone ₃With backward diode D ₄, at B ₁7,8 ends between also be connected to reverse two utmost point villous themeda D of polyphone ₅With forward two utmost point villous themeda D ₆, D ₅, D ₆Positive pole meet capacitor C respectively ₂₀Positive pole and the negative pole of light-emitting diodes villous themeda, light-emitting diodes villous themeda positive pole connects positive source, capacitor C ₂₀The input transformer B of negative pole sending and receiving control amplifier ₃Centre tap 2 ends of the first utmost point, B ₁7,8 ends of the inferior utmost point simultaneously also with B ₃Just 1,3 ends of the utmost point join,

Described control amplifier is: the output transformer B that sends out the control attenuator ₃5,6 ends of the inferior utmost point, 6 end ground connection wherein, 5 are connected to capacitor C ₁₉Positive pole, C ₁₉Negative pole be connected to BG ₄Base stage carry out single villous themeda power amplification, amplifying signal is through transformer B ₄Export the input A of comparison circuit after the coupling to,

Described voice operated switch circuit is: the output by comparison circuit is connected to BG respectively ₅, BG ₇Base stage, more respectively by BG ₅, BG ₆And BG ₇, BG ₈Form the two poles of the earth dc amplification circuit,

Described controlled attenuator is: at the output transformer B of two or four line change-over circuits ₅Between 7,8 ends of the inferior utmost point, insert forward two utmost point villous themeda D that are chained together ₁₃With reverse two utmost point villous themeda D ₁₄, at B ₅7,8 ends between, also be connected to two utmost point villous themeda D that are chained together ₁₅With forward two utmost point villous themeda D ₁₆, again by D ₁₅, D ₁₆Forward termination capacitor C ₁₆Positive pole, C ₁₆Negative pole accept the input transformer B of control amplifier ₇Centre tap 2 ends of the first utmost point, B simultaneously ₅7,8 ends respectively with B ₇Just 1,3 ends of the utmost point join,

Described controlled amplifier is: the output transformer B of controlled attenuator ₇5,6 ends of the inferior utmost point, 6 end ground connection wherein, 5 termination capacitor C ₂₇Positive pole, C ₂₇Negative pole through BG ₉, BG ₁₀Output transformer B is exported to after amplifying in the two poles of the earth ₈1,3 ends of the first utmost point, B ₈The inferior utmost point 6 end ground connection, the input C of 5 termination comparison circuits.

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