Digital handheld interphone

Abstract

The utility model discloses a digital handheld interphone, which structurally comprises a shell structure and a circuit structure, the shell structure is formed by splicing a surface shell, a waterproof ring, a circuit board inner shell, a battery inner shell, a rear cover and a back clip, a circuit board is arranged in the circuit board inner shell, and the circuit board is arranged in the circuit board inner shell. A battery and an antenna connected to the circuit board and installed on the shell structure are arranged in the battery inner shell, the circuit structure comprises a loudspeaker and a microphone, the circuit structure is located on the circuit board, and the circuit structure comprises a receiver circuit and a transmitter circuit. Signals received by an antenna are extracted and amplified in a receiving circuit, frequency modulation signals sent by a circuit structure are amplified and output by a transmitter circuit and then are applied to the antenna to be sent out, a UHF frequency modulation circuit is adopted in the circuit structure, DA high-precision control is adopted for radio frequency power, AD real-time detection is adopted for receiving sensitivity, and multi-point debugging is carried out. And the power and the sensitivity of each frequency band are balanced.

Description

Technical Field

[0001] The utility model relates to a digital handheld intercom, belonging to the technical field of intercom communication. Background Art

[0002] A walkie-talkie can be used for conversations without any network support and without incurring any call charges. It is suitable for relatively fixed and frequent call occasions. It consists of a casing, a host, a battery, a belt clip, a charger, and an antenna. The time-division communication of a walkie-talkie is an application of communication technology. Time-division communication is mainly a technology that divides time into multiple time slots, and each time slot is assigned to different signals for transmission. In this way, multiple signals can be transmitted in turn on the same physical channel, thereby realizing multiplexing. However, existing walkie-talkies are prone to problems such as the transmission and reception bit error rate of 4FSK in time-division communication, which will greatly affect communication. Therefore, a digital handheld walkie-talkie is proposed to address the above problems. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a digital handheld intercom to solve the existing problems.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a digital handheld walkie-talkie, whose structure includes a shell structure and a circuit structure, the shell structure is spliced ​​by a face shell, a waterproof ring, a circuit board inner shell, a battery inner shell, a back cover and a back clip, the circuit board inner shell is provided with a circuit board, the battery inner shell is provided with a battery and an antenna connected to the circuit board and installed on the shell structure, the circuit structure includes a speaker and a microphone, the circuit structure is located on the circuit board, the circuit structure includes a receiver circuit and a transmitter circuit, the signal received by the antenna is extracted and amplified in the receiving circuit, the frequency modulation signal emitted by the circuit structure is amplified and output by the transmitter circuit and then applied to the antenna for emission.

[0005] Furthermore, the receiver circuit includes a radio frequency circuit, which is composed of a radio frequency filter, an antenna switch, and a radio frequency amplifier. The signal received by the antenna is filtered by the tuning of the radio frequency filter and the antenna switch, and then amplified and transmitted by the radio frequency amplifier.

[0006] Furthermore, the receiver circuit also includes a dedicated module, which includes a dedicated module IC150 and a dedicated module IC701. The dedicated module IC150 is a dedicated module for demodulating the AF signal. The signal amplified by the RF amplifier is demodulated by the dedicated module IC150 and output to the dedicated module IC701. The dedicated module IC701 determines the call permission and digitally decodes the voice to restore it to analog voice and then sounds it through the speaker.

[0007] Further, the transmitter circuit includes a microphone amplifier, a buffer AMP, a pre-driver AMP, and a power amplifier. The signal of the microphone is amplified by the microphone amplifier and then applied to the dedicated module IC701 and the dedicated module IC150 for frequency modulation. After passing through the buffer AMP, the pre-driver AMP, and the power amplifier in sequence, it is amplified and then applied to the antenna.

[0008] The beneficial effects of the present utility model are as follows:

[0009] The circuit structure adopts a UHF frequency modulation circuit, the radio frequency power is precisely controlled by DA, the receiving sensitivity is detected in real time by AD, and multi-point debugging is carried out to balance the power and sensitivity of each frequency band;

[0010] It supports the direct mode and the relay mode. The walkie-talkies can directly communicate with each other, or can be relayed through a relay station to achieve the effect of doubling the communication distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] By reading the following detailed description of the non-restrictive embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present utility model will become more apparent:

[0012] Figure 1 It is a schematic diagram of the overall structure of a digital handheld walkie-talkie of the present utility model;

[0013] Figure 2 It is the circuit structure principle Figure 1 schematic diagram of a digital handheld walkie-talkie of the present utility model;

[0014] Figure 3 It is the circuit structure principle Figure 2 schematic diagram of a digital handheld walkie-talkie of the present utility model;

[0015] Figure 4 It is the circuit structure principle Figure 3 schematic diagram of a digital handheld walkie-talkie of the present utility model;

[0016] Figure 5 It is the circuit structure principle Figure 4 schematic diagram of a digital handheld walkie-talkie of the present utility model;

[0017] Figure 6 It is the circuit structure principle Figure 5 schematic diagram of a digital handheld walkie-talkie of the present utility model;

[0018] Figure 7 It is the circuit structure principle Figure 6 schematic diagram of a digital handheld walkie-talkie of the present utility model;

[0019] Figure 8 The circuit structure principle of a digital handheld walkie - talkie of the present utility model Figure 7 Structure schematic diagram.

[0020] In the figure: front shell 1, waterproof ring 2, inner circuit board shell 3, inner battery shell 4, rear cover 5, back clip 6, circuit board 7, battery 8, antenna 9. Specific implementation manners

[0021] To make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific implementation manners.

[0022] Please refer to Figures 1-8 , the present utility model provides a technical solution for a digital handheld walkie - talkie: its structure includes a housing structure and a circuit structure. The housing structure is assembled by a front shell 1, a waterproof ring 2, an inner circuit board shell 3, an inner battery shell 4, a rear cover 5 and a back clip 6. A circuit board 7 is arranged inside the inner circuit board shell 3. A battery 8 and an antenna 9 connected to the circuit board 7 and installed on the housing structure are arranged inside the inner battery shell 4. The circuit structure includes a speaker and a microphone. The circuit structure is located on the circuit board 7. The circuit structure includes a receiver circuit and a transmitter circuit. The signal received by the antenna 9 is extracted and amplified in the receiving circuit. The frequency - modulated signal sent by the circuit structure is amplified and output by the transmitter circuit and then sent out through the antenna 9;

[0023] The receiver circuit includes a radio frequency circuit. The radio frequency circuit is composed of a radio frequency filter, an antenna switch and a radio frequency amplifier. The signal received by the antenna 9 is tuned and filtered by the radio frequency filter and the antenna switch, and then amplified and transmitted by the radio frequency amplifier;

[0024] The receiver circuit also includes a special module. The special module includes special module IC150 and special module IC701. Special module IC150 is a special module for demodulating the AF signal. The signal amplified by the radio frequency amplifier is demodulated by special module IC150 and then output to special module IC701. Special module IC701 discriminates the call permission and decodes the voice digital signal into an analog voice and then sounds through the speaker;

[0025] The transmitter circuit includes a microphone amplifier, a buffer AMP, a pre - driver AMP and a power amplifier. The signal of the microphone is amplified by the microphone amplifier and then applied to special module IC701 and special module IC150 for frequency modulation, and then amplified in sequence by the buffer AMP, the pre - driver AMP and the power amplifier and then applied to the antenna 9;

[0026] For example, the working mode includes a receiver circuit and a transmitter circuit;

[0027] Receiver circuit: After the radio frequency signal of antenna 9 passes through the high-pass filter LPF, it is tuned and filtered by the antenna switch BA592 and the filter BPF. The filtered RX signal is amplified by the radio frequency amplifier BF1212. The amplified signal is applied to the AF signal demodulated by the RF dedicated module IC150 and output from pin 9 to the dedicated module IC701. The dedicated module IC701 determines the call permission and decodes the voice digital signal back into an analog voice. The output voice controls the audio power amplifier IC401 through Q404 and then is applied to the speaker to generate sound.

[0028] Transmitter circuit: The AF signal of the microphone passes through the microphone mute Q422, is amplified by the microphone amplifier IC251, and then applied to the dedicated module IC701. According to the channel setting, a digital or analog signal is transmitted to the RF dedicated module IC150 for frequency modulation. The frequency-modulated signal is amplified successively by the buffer AMP Q203 and the pre-driver AMP Q202. The amplified signal is applied to the power amplifier Q201 by L210 and C219 to obtain the TX output power. The amplified TX signal passes through antenna 9, SWD201, and LPF (L104, L103, L102, C105, C103, C101), and then is applied to antenna 9.

[0029] The above components are all marked in the drawings.

[0030] In addition, it should be understood that although this specification is described according to the 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. 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 digital handheld intercom, comprising a housing structure and a circuit structure, wherein the housing structure is composed of a front housing (1), a waterproof ring (2), a circuit board inner housing (3), a battery inner housing (4), a rear cover (5) and a back clip (6), wherein the circuit board inner housing (3) is provided with a circuit board (7), the battery inner housing (4) is provided with a battery (8) and an antenna (9) connected to the circuit board (7) and mounted on the housing structure, and wherein the circuit structure comprises a speaker and a microphone, and wherein: The circuit structure is located on the circuit board (7), and includes a receiver circuit and a transmitter circuit. The signal received by the antenna (9) is extracted and amplified in the receiving circuit, and the frequency modulation signal emitted by the circuit structure is amplified and output by the transmitter circuit and then applied to the antenna (9) for emission.

2. A digital handheld intercom according to claim 1, characterized in that: The receiver circuit comprises a radio frequency circuit, which is composed of a radio frequency filter, an antenna switch and a radio frequency amplifier. The signal received by the antenna (9) is filtered by tuning of the radio frequency filter and the antenna switch, and then amplified and transmitted by the radio frequency amplifier.

3. A digital handheld intercom according to claim 2, characterized in that: The receiver circuit also includes a dedicated module, which includes a dedicated module IC150 and a dedicated module IC701. The dedicated module IC150 is a dedicated module for demodulating AF signals. The signal amplified by the RF amplifier is demodulated by the dedicated module IC150 and output to the dedicated module IC701. The dedicated module IC701 determines the call permission and digitally decodes the voice to restore it to analog voice and then sounds it through the speaker.

4. A digital handheld intercom according to claim 3, characterized in that: The transmitter circuit includes a microphone amplifier, a buffer AMP, a pre-driver AMP and a power amplifier. The microphone signal is amplified by the microphone amplifier and then applied to the dedicated module IC701 and the dedicated module IC150 for frequency modulation. After being amplified in sequence by the buffer AMP, the pre-driver AMP and the power amplifier, it is applied to the antenna (9).

Images