Marine interphone

Abstract

The utility model discloses a marine interphone, the structure of which comprises an interphone body, the interphone body comprises an antenna, a horn and a loudspeaker, and the interphone body is provided with a waterproof gasket used for realizing the whole machine waterproofness of the interphone body. The interphone is characterized in that a processing chip, a receiving circuit and a transmitting circuit are further arranged in the interphone body, the receiving circuit receives information through the antenna and then transmits the information through the loudspeaker, the transmitting circuit receives the information through the loudspeaker and then transmits the information through the antenna, and the processing chip detects received signals through a control diode and controls audio output. And a multi-filtering mode is adopted, so that background noise is greatly reduced, and the volume of effective voice of a call is improved.

Description

Technical Field

[0001] The utility model relates to a marine intercom, belonging to the technical field of intercoms. Background Art

[0002] Marine intercoms are mainly used for communication in areas such as the ocean, rivers, lakes, docks, and islands, and are widely used in various wireless communication occasions such as natural disaster prevention, disaster emergency communication, fire safety, outdoor tourism, water sports, water operations, fishery farming, seaside vacations, leisure tourism, inland waterway transportation, dock scheduling, port operations, and marine transportation. They can also be used in GMDSS emergency communication scenarios. When communicating at sea, the sea breeze will generate a relatively large background noise on the microphone, and the noise of the ship's engine, the sound of the waves, etc. will also generate a relatively large background noise on the intercom call, resulting in a decline in call quality. Therefore, in view of the above situation, a marine intercom is proposed. Content of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a marine intercom to solve the existing problems.

[0004] To achieve the above purpose, the utility model is realized through the following technical solutions: A marine intercom, whose structure includes an intercom body. The intercom body includes an antenna, a speaker, and a loudspeaker. A waterproof gasket is provided on the intercom body to achieve the overall waterproofing of the intercom body. It is characterized in that: The intercom body also has a processing chip, a receiving circuit, and a transmitting circuit. The receiving circuit receives information through the antenna and is emitted by the speaker. The transmitting circuit receives information through the loudspeaker and is emitted by the antenna. The processing chip detects the received signal by controlling a diode and controls the audio output.

[0005] Further, the receiving circuit includes a filtering circuit, a mixing circuit, an intermediate frequency amplification circuit, and an audio amplification circuit. The signal received by the antenna is filtered by the filtering circuit and then enters the mixing circuit for secondary filtering. The signal after secondary filtering is filtered for the third time by the intermediate frequency amplification circuit and then amplified and frequency modulation detected. Finally, it is filtered for the fourth time by the audio amplification circuit and the sound is emitted by the speaker.

[0006] Further, the filtering circuit includes a radio frequency amplifier and a band-pass filter. The signal received by the antenna is applied to the radio frequency amplifier. When the signal is amplified, the signal is filtered by the band-pass filter and then transmitted to the mixing circuit.

[0007] Further, the mixing circuit includes a mixer and a crystal filter. The signal of the radio frequency amplifier and the first local oscillator signal of the PLL circuit of the mixer are heterodyned to generate a first intermediate frequency signal. The first intermediate frequency signal is further filtered by the crystal filter.

[0008] Furthermore, the intermediate frequency amplification circuit includes an intermediate frequency amplifier and a ceramic filter. The first intermediate frequency signal enters the intermediate frequency amplifier through the ceramic filter. After the first intermediate frequency signal is filtered again in the ceramic filter, it enters the intermediate frequency amplifier and is heterodyned again in the intermediate frequency amplifier to generate a second intermediate frequency signal, and then is amplified and frequency modulation detected in the intermediate frequency amplifier.

[0009] Furthermore, the audio amplification circuit includes a baseband processor, an audio volume control, and an audio power amplifier. The signal obtained from the intermediate frequency amplifier is filtered by the baseband processor, amplified to a sufficient volume through the audio volume control, and then drives the speaker to emit sound through the audio power amplifier.

[0010] Furthermore, the transmitting circuit includes a baseband processor, a voltage controlled oscillator, and a low pass filter. After the baseband processor weights and amplifies the signal received by the microphone, it is amplified again through the voltage controlled oscillator to generate radio frequency power and then transmitted to the antenna through the low pass filter.

[0011] The beneficial effects of the present utility model are as follows:

[0012] By adopting a multiple filtering method, the background noise is greatly reduced, thereby enhancing the volume of the effective sound during a call;

[0013] Waterproof gaskets are provided at the splicing parts of the whole machine, greatly improving the waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other features, objectives, and advantages of the present utility model will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0015] Figure 1 It is a schematic diagram of the structure of the intercom body of a marine intercom of the present utility model;

[0016] Figure 2 It is a schematic diagram of the circuit diagram of the receiving circuit of a marine intercom of the present utility model;

[0017] Figure 3 It is a schematic diagram of the circuit diagram of the transmitting circuit of a marine intercom of the present utility model.

[0018] In the figure: the intercom body 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To make the technical means, creative features, achieved objectives, and functions of the present utility model easy to understand, the present utility model will be further elaborated below in conjunction with the specific embodiments.

[0020] Please refer to Figures 1 - 3, the present utility model provides a technical solution for a marine intercom: its structure includes an intercom body 1, and the intercom body 1 includes an antenna, a speaker, and a loudspeaker. A waterproof gasket is provided on the intercom body 1 to achieve the overall waterproofing of the intercom body 1. It is characterized in that: the intercom body 1 also has a processing chip, a receiving circuit, and a transmitting circuit. The receiving circuit receives information through the antenna and emits it through the speaker. The transmitting circuit receives information through the loudspeaker and emits it through the antenna. The processing chip detects the received signal and controls the audio output by controlling a diode, processing chip IC360;

[0021] The receiving circuit includes a filtering circuit, a mixing circuit, an intermediate frequency amplification circuit, and an audio amplification circuit. The signal received by the antenna is filtered by the filtering circuit and then enters the mixing circuit for secondary filtering. The signal after secondary filtering is filtered for the third time by the intermediate frequency amplification circuit and then amplified and frequency modulation detected. Finally, it is filtered for the fourth time by the audio amplification circuit and the speaker emits sound;

[0022] The filtering circuit includes a radio frequency amplifier and a band-pass filter. The signal received by the antenna is applied to the radio frequency amplifier. When the signal is amplified, the signal is filtered by the band-pass filter and then transmitted to the mixing circuit, radio frequency amplifier Q90;

[0023] The mixing circuit includes a mixer and a crystal filter. The signal of the radio frequency amplifier is heterodyned with the first local oscillator signal of the PLL circuit of the mixer to generate a first intermediate frequency signal. The first intermediate frequency signal is further filtered by the crystal filter, first mixer Q150;

[0024] The intermediate frequency amplification circuit includes an intermediate frequency amplifier and a ceramic filter. The first intermediate frequency signal enters the intermediate frequency amplifier through the ceramic filter. The first intermediate frequency signal is filtered again in the ceramic filter and then enters the intermediate frequency amplifier and is heterodyned again in the intermediate frequency amplifier to generate a second intermediate frequency signal. Then it is amplified and frequency modulation detected in the intermediate frequency amplifier, intermediate frequency amplifier IC170, ceramic filter FI170;

[0025] The audio amplification circuit includes a baseband processor, an audio volume control, and an audio power amplifier. The signal obtained in the intermediate frequency amplifier is filtered by the baseband processor, amplified to a sufficient volume through the audio volume control, and then drives the speaker to emit sound through the audio power amplifier, baseband processor IC200, audio volume control IC190, audio power amplifier IC362;

[0026] The transmitting circuit includes a baseband processor, a voltage-controlled oscillator, and a low-pass filter. The baseband processor weights and amplifies the signal received by the microphone, then amplifies it again through the voltage-controlled oscillator to generate radio frequency power and transmits it to the antenna through the low-pass filter.

[0027] For example, the signal received by the antenna is applied to a radio frequency amplifier. After the signal is amplified, it is filtered by a band-pass filter and then transmitted to a mixing circuit. The signal of the radio frequency amplifier is heterodyned with the first local oscillator signal of the PLL circuit of the mixer to generate a first intermediate frequency signal. The first intermediate frequency signal is further filtered by a crystal filter. The first intermediate frequency signal enters the intermediate frequency amplifier through a ceramic filter. After the first intermediate frequency signal is filtered again in the ceramic filter, it enters the intermediate frequency amplifier and is heterodyned again in the intermediate frequency amplifier to generate a second intermediate frequency signal. Then, it is amplified and frequency modulation detected in the intermediate frequency amplifier. The signal obtained in the intermediate frequency amplifier is filtered by a baseband processor, amplified to a sufficient volume through an audio volume control, and then drives a speaker to emit sound through an audio power amplifier.

[0028] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A marine intercom, the structure of which comprises an intercom body (1). The intercom body (1) includes an antenna, a horn, and a speaker. A waterproof gasket is provided on the intercom body (1) to achieve the overall waterproofing of the intercom body (1). It is characterized in that: The walkie-talkie body (1) also has a processing chip, a receiving circuit, and a transmitting circuit. The receiving circuit receives information through an antenna and emits it through a speaker. The transmitting circuit receives information through a microphone and emits it through the antenna. The processing chip detects the received signal and controls the audio output by controlling a diode.

2. The marine intercom according to claim 1, characterized in that: The receiving circuit includes a filtering circuit, a mixing circuit, an intermediate frequency amplification circuit, and an audio amplification circuit. The signal received by the antenna is filtered by the filtering circuit and then enters the mixing circuit for secondary filtering. The signal after secondary filtering is filtered for the third time by the intermediate frequency amplification circuit and then amplified and frequency modulation detected. Finally, it is filtered for the fourth time by the audio amplification circuit and emitted by the speaker.

3. The marine intercom according to claim 2, characterized in that: The filtering circuit includes a radio frequency amplifier and a band-pass filter. The signal received by the antenna is applied to the radio frequency amplifier. When the signal is amplified, it is filtered by the band-pass filter and then transmitted to the mixing circuit.

4. The marine intercom according to claim 3, characterized in that: The mixing circuit includes a mixer and a crystal filter. The signal from the radio frequency amplifier and the first local oscillator signal of the PLL circuit of the mixer are heterodyned to generate a first intermediate frequency signal. The first intermediate frequency signal is further filtered by the crystal filter.

5. The marine intercom according to claim 4, characterized in that: The intermediate frequency amplification circuit includes an intermediate frequency amplifier and a ceramic filter. The first intermediate frequency signal enters the intermediate frequency amplifier through the ceramic filter. The first intermediate frequency signal is filtered again in the ceramic filter and then enters the intermediate frequency amplifier, where it is heterodyned again to generate a second intermediate frequency signal, and then amplified and frequency modulation detected in the intermediate frequency amplifier.

6. The marine intercom according to claim 5, wherein: The audio amplification circuit includes a baseband processor, an audio volume control, and an audio power amplifier. The signal obtained from the intermediate frequency amplifier is filtered by the baseband processor, amplified to a sufficient volume through the audio volume control, and then drives the speaker to emit sound through the audio power amplifier.

7. The marine intercom according to claim 1, characterized in that: The transmitting circuit includes a baseband processor, a voltage-controlled oscillator, and a low-pass filter. The signal received by the microphone is weighted and amplified by the baseband processor, further amplified by the voltage-controlled oscillator to generate radio frequency power, and then transmitted to the antenna through the low-pass filter.

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