CN202261478U

CN202261478U - Speech signal amplifier

Info

Publication number: CN202261478U
Application number: CN2011204094777U
Authority: CN
Inventors: 郝一亚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-10-25
Filing date: 2011-10-25
Publication date: 2012-05-30
Anticipated expiration: 2021-10-25

Abstract

The utility model discloses a speech signal amplifier which comprises a power source with a manual switch, a preamplifier circuit, a bandwidth limited circuit and a power amplifier circuit, wherein the preamplifier circuit, the bandwidth limited circuit and the power amplifier circuit are driven by the power source; the preamplifier circuit is used for receiving a speech signal of a telephone and carrying out power amplification on the speech signal; the bandwidth limited circuit is used for receiving the speech signal subjected to power amplification of the preamplifier circuit, and filtering the speech signal to remove noise; and the power amplifier circuit is used for receiving the speech signal filtered by the bandwidth limited circuit, a carrying out power amplification on the speech signal to acquire a sound signal capable of driving a telephone loudspeaker, and outputting the sound signal to the telephone loudspeaker. The utility model provides a speech signal amplifier capable of implementing noise reduction and loudspeaking on a telephone.

Description

Speech signal amplifier

Technical field

The utility model relates to a kind of speech signal amplifier, especially a kind of speech signal amplifier that is used on the telephone set.

Background technology

People usually run into the other side's poor signal when using phone, perhaps people's ambient sound of speech is noisy, causes sound not heard.Because general telephone set all is the direct conversion to original sound signal, so when the bad situation of sort signal occurring, people usually can hang up the telephone and redial, and rebulid conversation, and can't on telephone set, the situation to poor signal improve.When people's ambient sound of speech is noisy, then can only try every possible means one to converse again in the more quiet environment on every side, also can't on telephone set, make improvement.

The utility model content

The utility model technical problem to be solved provides a kind ofly can carry out the speech signal amplifier that noise reduction is raised one's voice on telephone set.

For solving the problems of the technologies described above; The speech signal amplifier of the utility model comprises the power supply that has hand switch; Also comprise pre-amplification circuit, bandwidth-limited circuit and power amplification circuit, wherein: the go forward side by side power amplification of lang tone signal of the voice signal that said pre-amplification circuit receives phone by said power drives; Said bandwidth-limited circuit receives the voice signal that has carried out power amplification through said pre-amplification circuit, and to its filtering, to remove noise; Said power amplification circuit receives the voice signal that has carried out filtering through bandwidth-limited circuit, and it is carried out power amplification, exports to telelecture after making it become the audio signal that can drive telelecture.

Preferably, said pre-amplification circuit is the NE5532P integrated amplifier, and said bandwidth-limited circuit is together in series by a low pass filter and a high pass filter and forms.

The advantage of the utility model is:

1. can effectively remove the noise composition in the conversation signal, and improve the volume of conversation;

2. utilize hand switch on the power supply can control the action of speech signal amplifier easily, start when bad or background noise is too big at conversation signal, when speech quality is good, then need not to start.

Description of drawings

Below in conjunction with accompanying drawing the embodiment of the utility model is done further detailed explanation.

Fig. 1 is the principle schematic of the utility model;

Fig. 2 is an embodiment of the pre-amplification circuit among Fig. 1;

Fig. 3 is an embodiment of the bandwidth-limited circuit among Fig. 1.

Embodiment

Below in conjunction with Figure of description the utility model is done further description.

A kind of speech signal amplifier; As shown in Figure 1; Comprise the D.C. regulated power supply that has hand switch; Also comprise pre-amplification circuit, bandwidth-limited circuit and power amplification circuit, wherein: the go forward side by side power amplification of lang tone signal of the voice signal that said pre-amplification circuit receives phone by said power drives; Said bandwidth-limited circuit receives the voice signal that has carried out power amplification through said pre-amplification circuit, and to its filtering, to remove noise; Said power amplification circuit receives the voice signal that has carried out filtering through bandwidth-limited circuit, and it is carried out power amplification, exports to telelecture after making it become the audio signal that can drive telelecture.

As shown in Figure 2, said pre-amplification circuit is the NE5532P integrated amplifier.As shown in Figure 3, said bandwidth-limited circuit is together in series by a low pass filter and a high pass filter and forms.

During work, pre-amplification circuit receives the voice signal that transmits from the Mike of other end telephone set, this signal is carried out power amplification, so that the bandwidth-limited circuit of back carries out signal processing.Low pass filter in the bandwidth-limited circuit and high pass filter can be removed low frequency noise and the high frequency noise in the voice signal respectively, thereby can obtain the voice of needs.Voice signal through filtering is enlarged into the audio signal that can drive loud speaker in power amplification circuit, and is outputed on the loud speaker of telephone set, thereby sounds.Fine when the signal of phone, need not carry out noise reduction when raising one's voice, the manual-lock power supply gets final product, and can not influence conversation.

More than; Be merely the preferred embodiment of the utility model; But the protection range of the utility model is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection range of the utility model.Therefore, the protection range of the utility model should be as the criterion with the protection range that claim was defined.

Claims

1. a speech signal amplifier comprises the power supply that has hand switch, it is characterized in that, also comprises pre-amplification circuit, bandwidth-limited circuit and power amplification circuit by said power drives, wherein:

The go forward side by side power amplification of lang tone signal of the voice signal that said pre-amplification circuit receives phone;

Said bandwidth-limited circuit receives the voice signal that has carried out power amplification through said pre-amplification circuit, and to its filtering, to remove noise;

Said power amplification circuit receives the voice signal that has carried out filtering through bandwidth-limited circuit, and it is carried out power amplification, exports to telelecture after making it become the audio signal that can drive telelecture.

2. speech signal amplifier as claimed in claim 1 is characterized in that, said pre-amplification circuit is the NE5532P integrated amplifier, and said bandwidth-limited circuit is together in series by a low pass filter and a high pass filter and forms.