A digital intercom and its recording circuit

Abstract

The utility model provides a kind of recording circuit of digital intercom, it is related to intercom field, including receiving processing module, digital processor, microcontroller, FLASH storage, microphone, loudspeaker and sending processing module, receiving processing module, digital processor, microcontroller and FLASH storage of sequentially connected form interface recording storage branch, microphone, digital processor, microcontroller and FLASH storage of sequentially connected form local recording storage branch, FLASH storage, microcontroller, digital processor and sending processing module of sequentially connected form recording emission branch, FLASH storage, microcontroller, digital processor and loudspeaker of sequentially connected form recording playback branch.The circuit of the utility model is simpler, lower in cost, and rich in function.

Description

Technical Field

[0001] This utility model relates to the field of walkie-talkies, and in particular to a digital walkie-talkie and its recording circuit. Background Technology

[0002] Digital walkie-talkies are portable communication tools, typically consisting of one or more interconnected wireless devices, enabling quick and easy two-way communication. Recording, as a special storage method, is increasingly being used in walkie-talkies. However, current digital walkie-talkies require an external recording board to implement recording functionality. Furthermore, the digital processors in existing digital walkie-talkies lack a digital-to-analog (DAC) port, necessitating an external DAC module that communicates with the digital processor via the I2S protocol. This makes the recording circuitry more complex, increases costs, and raises the likelihood of malfunctions. Additionally, current digital walkie-talkies only support playback of recorded messages, offering limited functionality. Summary of the Invention

[0003] The main purpose of this invention is to propose a digital walkie-talkie and its recording circuit, which is simpler, lower in cost, and more functional.

[0004] This utility model is achieved through the following technical solution: A recording circuit for a digital walkie-talkie includes a receiving processing module, a digital processor, a microcontroller, a FLASH memory, a microphone, a speaker, and a transmitting processing module. The receiving processing module, digital processor, microcontroller, and FLASH memory are connected in sequence to form a receiving recording storage branch. The microphone, digital processor, microcontroller, and FLASH memory are connected in sequence to form a local recording storage branch. The FLASH memory, microcontroller, digital processor, and transmitting processing module are connected in sequence to form a recording transmission branch. The FLASH memory, microcontroller, digital processor, and speaker are connected in sequence to form a recording playback branch.

[0005] Furthermore, the digital processor uses the SCT3288TD chip, and the microcontroller uses the AT32F435VMT7 chip. The digital processor and the microcontroller communicate via the SPI protocol.

[0006] Furthermore, in the receiving recording storage branch, the output of the receiving processing module is connected to the FM IN port of the digital processor to convert the received audio signal into PCM data. The SPI1 MISO pin of the digital processor is connected to the SPI1 MISO pin of the microcontroller, and the SPI2 MOSI pin of the microcontroller is connected to the SPI2 MOSI pin of the FLASH storage.

[0007] Furthermore, in the local recording and storage branch, the microphone output terminal is connected to the MIC IN port of the digital processor to convert the audio electrical signal output by the microphone into PCM data. The SPI1 MISO pin of the digital processor is connected to the SPI1 MISO pin of the microcontroller, and the SPI2 MOSI pin of the microcontroller is connected to the SPI2 MOSI pin of the FLASH storage.

[0008] Furthermore, in the recording transmission branch, the SPI2 MISO pin of the FLASH storage is connected to the SPI2 MISO pin of the microcontroller, and the SPI1 MOSI pin of the microcontroller is connected to the SPI1 MOSI pin of the digital processor, so that the microcontroller can read the recording data stored in the FLASH and transmit the recording data to the digital processor. The second DAC output terminal of the digital processor is connected to the input terminal of the transmission processing module.

[0009] Furthermore, in the recording and playback branch, the SPI2 MISO pin of the FLASH storage is connected to the SPI2 MISO pin of the microcontroller, and the SPI1 MOSI pin of the microcontroller is connected to the SPI1 MOSI pin of the digital processor, so that the microcontroller can read the recording data stored in the FLASH and transmit the recording data to the digital processor. The first DAC output terminal of the digital processor is connected to the speaker input terminal.

[0010] Furthermore, the receiving processing module includes an antenna, a radio frequency transceiver switch, a receiving frequency selection module, and an analog baseband module connected in sequence. The radio frequency transceiver switch opens the receiving path, and the signal received by the antenna enters the receiving frequency selection module through the radio frequency transceiver switch to filter out signals outside the operating frequency band, and then enters the analog baseband module for demodulation before being output.

[0011] Furthermore, the transmission processing module includes a radio frequency processor, a transmission amplification module, a radio frequency transceiver switch, and an antenna connected in sequence. The radio frequency transceiver switch opens the transmission path, the audio signal is sent to the radio frequency processor for radio frequency modulation, and after being amplified by the transmission amplification module, it is transmitted through the radio frequency transceiver switch and the antenna.

[0012] Furthermore, the recording circuit also includes a first switch and a second switch. The first input terminal of the first switch is connected to the output terminal of the receiving processing module, and the second input terminal is connected to the first DAC output terminal of the digital processor. The output terminal of the first switch is connected to the speaker. The first input terminal of the second switch is connected to the microphone, and the second input terminal is connected to the second DAC output terminal of the digital processor. The output terminal of the first switch is connected to the transmitting processing module.

[0013] This utility model is also achieved through the following technical solutions: A digital walkie-talkie includes the recording circuitry described in any of the above descriptions.

[0014] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects: This utility model includes a receiving processing module, a digital processor, a microcontroller, FLASH storage, a microphone, a speaker, and a transmitting processing module, forming independent receiving recording and storage branches, local recording and storage branches, recording and transmitting branches, and recording and playback branches. It can record, store, and play back local audio and received audio, offering rich functionality. By using the digital processor and microcontroller in conjunction, recording, storage, and playback are achieved without the need for an external recording board or digital-to-analog converter interface, resulting in a simpler circuit and lower cost. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the principle of this utility model.

[0017] The components include: 1. Antenna; 2. RF transceiver switch; 3. Receiver frequency selection module; 4. Analog baseband module; 5. Digital processor; 6. Microcontroller; 7. FLASH storage; 8. First switch; 9. Audio amplifier; 10. Speaker; 11. Microphone; 12. Second switch; 13. RF processor; and 14. Transmitter amplification module. Detailed Implementation

[0018] Digital walkie-talkies include recording circuitry, such as... Figure 1 As shown, the recording circuit includes a receiving processing module, a digital processor 5, a microcontroller 6, a FLASH storage 7, a microphone 11, a speaker 10, a transmitting processing module, a first switch 8, a second switch 12, and an audio amplifier 9. The receiving processing module, digital processor 5, microcontroller 6, and FLASH storage 7 connected in sequence form a receiving recording storage branch. The microphone 11, digital processor 5, microcontroller 6, and FLASH storage 7 connected in sequence form a local recording storage branch. The FLASH storage 7, microcontroller 6, digital processor 5, and transmitting processing module connected in sequence form a recording transmission branch. The FLASH storage 7, microcontroller 6, digital processor 5, and speaker 10 connected in sequence form a recording playback branch.

[0019] In this embodiment, the digital processor 5 uses the SCT3288TD chip, which has two audio inputs and two audio outputs. The microcontroller 6 uses the AT32F435VMT7 chip. The digital processor 5 and the microcontroller 6 communicate via the SPI protocol. The microcontroller 6 provides a synchronization clock between itself and the digital processor 5 through the SPI1 SCLK pin, and provides a synchronization clock between itself and the FLASH memory 7 through the SPI2 SCLK pin.

[0020] In the receiving, recording, and storage branch, the output of the receiving processing module is connected to the FM IN port of the digital processor 5 to convert the received radio frequency signal into PCM (Pulse Code Modulation) data. The SPI1 MISO pin of the digital processor 5 is connected to the SPI1 MISO pin of the microcontroller 6, and the SPI2 MOSI pin of the microcontroller 6 is connected to the SPI2 MOSI pin of the FLASH memory 7. The receiving processing module includes an antenna 1, a radio frequency transceiver switch 2, a receiving frequency selection module 3, and an analog baseband module 4 connected in sequence. The radio frequency transceiver switch 2 opens the receiving path, and the user starts the recording function by operating the walkie-talkie. The signal received by the antenna 1 enters the receiving frequency selection module 3 through the radio frequency transceiver switch 2 to filter out signals outside the operating frequency band, and then enters the analog baseband module 4 for demodulation before entering the digital processor 5. The digital processor 5 samples, quantizes, encodes, and compresses the received signal to convert it into PCM data. The microcontroller 6 reads the data from the digital processor 5 through the SPI1 MISO pin and stores it in the FLASH memory through the SPI2 MOSI pin. The process of converting the received signal into PCM data by the digital processor 5 is existing technology. The demodulation process performed by the analog baseband module 4 is also existing technology.

[0021] In the local recording and storage branch, the output of microphone 11 is connected to the MIC IN port of digital processor 5 to convert the audio electrical signal output by microphone 11 into PCM data. The SPI1 MISO pin of digital processor 5 is connected to the SPI1 MISO pin of microcontroller 6, and the SPI2 MOSI pin of microcontroller 6 is connected to the SPI2 MOSI pin of FLASH storage 7. When the user speaks into the walkie-talkie, microphone 11 collects the external sound and converts it into an audio electrical signal. This audio electrical signal enters digital processor 5, is converted into PCM data, and transmitted to FLASH storage 7.

[0022] In the recording transmission branch, the SPI2 MISO pin of FLASH storage 7 is connected to the SPI2 MISO pin of microcontroller 6, and the SPI1 MOSI pin of microcontroller 6 is connected to the SPI1 MOSI pin of digital processor 5, so that microcontroller 6 can read the recording data in FLASH storage 7 and transmit the recording data to digital processor 5. The second DAC output of digital processor 5 is connected to the input of the transmission processing module. The transmission processing module includes an RF processor 13, a transmission amplification module 14, an RF transceiver switch 2, and an antenna 1 connected in sequence. The RF transceiver switch 2 opens the transmission path, and digital processor 5 sends the audio signal to RF processor 13 for RF modulation. After being amplified by transmission amplification module 14, it is transmitted through RF transceiver switch 2 and antenna 1. The specific circuits of RF transceiver switch 2, receiver frequency selection module 3, analog baseband module 4, RF processor 13, and transmission amplification module 14 are all existing technologies.

[0023] In the recording and playback branch, the SPI2 MISO pin of FLASH storage 7 is connected to the SPI2 MISO pin of microcontroller 6, and the SPI1 MOSI pin of microcontroller 6 is connected to the SPI1 MOSI pin of digital processor 5, so that microcontroller 6 can read the recording data in FLASH storage 7 and transmit the recording data to digital processor 5. The first DAC output of digital processor 5 is connected to the input of audio amplifier 9, and the output of audio amplifier 9 is connected to the input of speaker 10. The specific circuit of audio amplifier 9 is existing technology.

[0024] The first input terminal of the first switch 8 is connected to the output terminal of the analog baseband module 4, and the second input terminal is connected to the first DAC output terminal of the digital processor 5. The output terminal of the first switch 8 is connected to the audio amplifier 9, and the output terminal of the audio amplifier 9 is connected to the speaker 10. The first input terminal of the second switch 12 is connected to the microphone 11, and the second input terminal is connected to the second DAC output terminal of the digital processor 5. The output terminal of the second switch 12 is connected to the radio frequency processor 13.

[0025] The SCT3288TD chip can perform both digital and analog recording, so walkie-talkies based on this chip can be either dual-mode (digital and analog) or digital. Therefore, when a user activates the recording function on the walkie-talkie: When the walkie-talkie is in analog receiving mode, the output terminal of the first switch 8 is connected to the first input terminal. The analog signal received by the antenna 1 enters the receiver frequency selection module 3 through the radio frequency transceiver switch 2 to filter out signals outside the working frequency band, and then enters the analog baseband module 4 for demodulation. The demodulated analog audio signal enters the digital processor 5 to be converted into PCM data and stored in the FLASH storage 7 to realize the recording of the analog received signal. On the other hand, it enters the audio amplifier 9 through the first switch 8 to amplify and drive the speaker 10 to play the audio. When the walkie-talkie is in digital receiving mode, the output terminal of the first switch 8 is connected to the second input terminal. The digital signal received by the antenna 1 enters the receiving frequency selection module 3 through the RF transceiver switch 2 to filter out signals outside the working frequency band, and then enters the analog baseband module 4 for demodulation. The demodulated signal enters the digital processor 5. The digital processor 5 converts the demodulated signal into PCM data and stores it in the FLASH storage 7 to realize digital signal recording. On the other hand, it converts, extracts, compresses, and decrypts the demodulated signal to reconstruct the voice signal. The reconstructed voice signal is converted into an analog voice signal and output from the first DAC output terminal of the digital processor 5. It then enters the audio amplifier 9 through the first switch 8 to amplify the signal and drive the speaker 10 to play it. When the walkie-talkie is in analog transmission mode, the output of the second switch 12 is connected to the first input. The audio signal collected from the microphone 11 enters the digital processor 5, is converted into PCM data, and is stored in the FLASH storage 7 to realize local recording; on the other hand, it enters the radio frequency processor 13 via the second switch 12 to generate a radio frequency carrier signal, which is then amplified by the transmission amplifier module 14 and transmitted through the radio frequency transceiver switch 2 from the antenna 1 port. When the walkie-talkie is in digital transmission mode, the output terminal of the second switch 12 is connected to the second input terminal. The audio electrical signal collected from the microphone 11 enters the digital processor 5. The digital processor 5 converts the audio signal into PCM data and stores it in the FLASH storage 7 to realize local recording. On the other hand, it converts, compresses, encrypts, encodes, and modulates the audio signal to generate a digital signal. This digital signal is output from the second DAC output terminal, enters the radio frequency processor 13 via the second switch 12 to generate a digital radio frequency carrier signal, and is then amplified by the transmit amplifier module 14 before being transmitted out through the radio frequency transceiver switch 2 from the antenna 1 port.

[0026] Both the first switch 8 and the second switch 12 are single-channel analog switches, and their on / off control process is existing technology.

[0027] The present invention will be further described below through specific embodiments.

[0028] In this utility model, the terms "first," "second," and "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," and "rear" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model, and does not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A recording circuit for a digital walkie-talkie, characterized in that: It includes a receiving processing module, a digital processor, a microcontroller, FLASH storage, a microphone, a speaker, and a transmitting processing module. The receiving processing module, digital processor, microcontroller, and FLASH storage connected in sequence form a receiving recording storage branch. The microphone, digital processor, microcontroller, and FLASH storage connected in sequence form a local recording storage branch. The FLASH storage, microcontroller, digital processor, and transmitting processing module connected in sequence form a recording transmission branch. The FLASH storage, microcontroller, digital processor, and speaker connected in sequence form a recording playback branch.

2. The recording circuit of a digital walkie-talkie according to claim 1, characterized in that: The digital processor uses the SCT3288TD chip, and the microcontroller uses the AT32F435VMT7 chip. The digital processor and the microcontroller communicate via the SPI protocol.

3. The recording circuit of a digital walkie-talkie according to claim 2, characterized in that: In the receiving recording and storage branch, the output of the receiving processing module is connected to the FM IN port of the digital processor to convert the received audio signal into PCM data. The SPI1 MISO pin of the digital processor is connected to the SPI1 MISO pin of the microcontroller, and the SPI2 MOSI pin of the microcontroller is connected to the SPI2 MOSI pin of the FLASH storage.

4. The recording circuit of a digital walkie-talkie according to claim 2 or 3, characterized in that: In the local recording and storage branch, the microphone output is connected to the MIC IN port of the digital processor to convert the audio electrical signal output by the microphone into PCM data.

5. The recording circuit of a digital walkie-talkie according to claim 2 or 3, characterized in that: In the recording transmission branch, the SPI2 MISO pin of the FLASH storage is connected to the SPI2 MISO pin of the microcontroller, and the SPI1 MOSI pin of the microcontroller is connected to the SPI1 MOSI pin of the digital processor, so that the microcontroller can read the recording data stored in the FLASH and transmit the recording data to the digital processor. The second DAC output terminal of the digital processor is connected to the input terminal of the transmission processing module.

6. The recording circuit of a digital walkie-talkie according to claim 5, characterized in that: In the recording and playback branch, the first DAC output of the digital processor is connected to the speaker input.

7. The recording circuit of a digital walkie-talkie according to claim 2 or 3, characterized in that: The receiving processing module includes an antenna, a radio frequency transceiver switch, a receiving frequency selection module, and an analog baseband module connected in sequence. The radio frequency transceiver switch opens the receiving path, and the signal received by the antenna enters the receiving frequency selection module through the radio frequency transceiver switch to filter out signals outside the operating frequency band, and then enters the analog baseband module for demodulation before being output.

8. The recording circuit of a digital walkie-talkie according to claim 2 or 3, characterized in that: The transmission processing module includes a radio frequency processor, a transmission amplification module, a radio frequency transceiver switch, and an antenna connected in sequence. The radio frequency transceiver switch opens the transmission path, and the audio signal is sent to the radio frequency processor for radio frequency modulation. After being amplified by the transmission amplification module, it is transmitted through the radio frequency transceiver switch and the antenna.

9. The recording circuit of a digital walkie-talkie according to claim 6, characterized in that: The recording circuit also includes a first switch and a second switch. The first input terminal of the first switch is connected to the output terminal of the receiving processing module, and the second input terminal is connected to the first DAC output terminal of the digital processor. The output terminal of the first switch is connected to the speaker. The first input terminal of the second switch is connected to the microphone, and the second input terminal is connected to the second DAC output terminal of the digital processor. The output terminal of the first switch is connected to the transmitting processing module.

10. A digital walkie-talkie, characterized in that: Includes the recording circuit as described in any one of claims 1 to 9.

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