KR100834359B1 - Voice Synthesize Output Method using Microprocessor of Mobile GPS Receiver - Google Patents

Abstract

According to the present invention, a GPS (Global Positioning System) receiver receives a satellite signal while driving on a road and passes a dangerous location that has been stored in advance. The method is disclosed.

The present invention provides a GPS receiving module for receiving a GPS signal, a voice synthesis IC for providing various voice guidance, an audio amplifier and a speaker for amplifying and outputting a voice signal in sufficient size, and a memory for storing various data. In a conventional GPS receiver for a vehicle comprising a microprocessor for selectively reproducing a voicement and controlling various convenient devices when the received GPS location data and the location data of a stored place are compared and matched, GPS receiver module, memory to compress and store voice, and microprocessor to restore voice compressed and stored in memory instead of using voice synthesis IC to output by PWM (Pulse with modulation) method. And an audio amplifier and a speaker.

Accordingly, the present invention can reduce the manufacturing cost because it is possible to reduce the parts used by processing by the program of the microprocessor without separately using the voice synthesis IC for outputting the voice alarm sound, and the effect that can be further miniaturized It is.

Description

Voice Synthesize Output Method using Microprocessor of Mobile GPS Receiver

1 is a block diagram of a conventional GPS receiver for a vehicle

2 is a block diagram of a GPS receiver for a vehicle according to the present invention

3 is an exemplary view showing a method of compressing a voice signal of the present invention into ADPCM data.

Figure 4 is a flow chart for the recovery and output of data stored for voice guidance in the program of the microprocessor of the present invention.

Figure 5 is an exemplary view showing the output of the data restored for the voice guidance in the program of the microprocessor of the present invention as a PWM signal.

* Description of the main parts of the drawings

100: antenna

101: GPS receiving module

102: microprocessor

103: memory

105: low pass filter

106: audio amplifier

107: Speaker

The present invention, in more detail in the voice synthesis output method of the GPS receiver for a vehicle that receives a satellite signal in real time while driving the road and outputs an alarm sound when passing a dangerous place on the road in advance, The vehicle is equipped with a GPS receiver that saves the coordinates of bridges, tunnels, hazardous locations and surveillance cameras in advance, and receives GPS satellite signals from satellites in real time while driving to match the stored coordinates. The present invention relates to a speech synthesis output method of a GPS receiver for a vehicle using a microprocessor for guiding speech.

The conventional GPS receiver for a vehicle includes a GPS receiving module for receiving a GPS signal from a satellite, a voice synthesis IC for storing voice for various voice guidance, and a row for shaping a waveform of a voice signal output from the voice synthesis IC. Selective playback of the voicement when the pass filter, the audio amplifier for amplifying the voice signal to a sufficient size, the speaker for outputting the voice, and the position data of the received GPS position data and the stored camera are compared and matched. It consists of a microprocessor for controlling various convenience devices. 1 is a block diagram of a conventional GPS receiver for a vehicle.

As shown in the related art, the conventional GPS receiver for a vehicle includes an antenna 100 and a GPS receiver module 101 and various guides such as an intersection, a tunnel, a bridge, a dangerous place, a surveillance camera, and the like to receive a GPS signal from a satellite. A speech synthesis IC 104 for storing, reproducing, and outputting speech for the voice; a low pass filter 105 for shaping waveforms of the speech signal output from the speech synthesis IC 104; Audio amplification unit 106 for amplifying, speaker 107 for outputting sound, locations of intersections, tunnels, bridges, dangerous places, surveillance cameras, etc. on the road, voice signal storage addresses for voice guidance, and the like. Memory 103 to compare the position data of the GPS satellite signal received in real time with various pre-stored position data, and if it matches, to control the voice guidance selectively The output, and to which a microprocessor 102 for controlling other devices and convenient.

The conventional GPS receiver for a vehicle receives the current position data in real time from the satellite through the antenna 100 and the GPS receiving module 101 while driving the vehicle on the road and inputs it to the microprocessor 102. The microprocessor 102 analyzes whether the location data received from the satellite is matched with the location data stored in the memory 103. In this way, when there is a matched position data, the microprocessor 102 outputs a control signal for outputting a corresponding voice signal in which the matched data is classified as a surveillance camera or a dangerous place, and by the control signal thereof. The speech signal stored in the speech synthesis IC 104 is outputted. In addition, the audio signal output from the voice synthesis IC 104 is amplified to a sufficient size by the audio amplifier 106 through a process of shaping the waveform while passing through the low pass filter 105 and is heard by the user through the speaker 107. Will be outputted. The GPS receiver for a vehicle provides detailed information by voice based on pre-stored data, compared to a method such as ringing an alarm or flashing a lamp, so that voice guidance is not required without knowing a separate method of use or distinguishing a signal. As it is possible to cope immediately with it, it is greatly helpful for safe operation. However, such a conventional GPS receiver for a vehicle has pre-recorded a voice of contents to be guided according to various situations on the road and stores it as a digital signal, and then, if necessary, analog In order to reproduce the signal, the voice synthesis IC 104 must be used to increase the cost and manufacturing cost of the product, and there is a problem in that it is difficult to miniaturize as the space for mounting components increases.

It is an object of the present invention to convert and compress PCM voice signal data into ADPCM data and store it in memory instead of the voice synthesis IC used to store and output the voice guidance signal in order to solve the above problems. It is to propose a speech synthesis output method of a GPS receiver for a vehicle using a microprocessor, which is restored to PCM data by a program of A and outputs a PWM signal.

In order to solve this problem, the present invention synthesizes and stores an antenna 100 and a GPS receiving module 101 for receiving a GPS signal from a satellite, and voices necessary for various guidance such as a road situation or a location of a surveillance camera. A voice synthesis IC 104, a low pass filter 105 for shaping a waveform of a voice signal, an audio amplifier 106 for amplifying a voice signal to a sufficient magnitude, a speaker 107, and data In the speech synthesis output method of a conventional vehicular GPS receiver having a memory 103 for storing and a microprocessor 102 for controlling the whole system,

Instead of the speech synthesis IC 104, the microprocessor 102 converts and compresses the PCM data into ADPCM data by a program and stores it in the memory 103 built in or external to the microprocessor 102 and stored if necessary. Proposes a speech synthesis output method of a GPS receiver for a vehicle using a microprocessor capable of receiving voice guidance by restoring the PCM data and outputting the result as a PWM signal to the low pass filter 105 and the audio amplifier 106. .

Accordingly, the present invention can reduce the manufacturing cost because it is possible to reduce the parts used by processing by the program of the microprocessor, without using a separate voice synthesis IC for storing and outputting the voice signal for voice guidance, and further miniaturization There is an effect that can be done.

The present invention will be described with reference to the accompanying drawings.

2 is a block diagram of a GPS receiver for a vehicle for generating and outputting voice in a microprocessor according to the present invention.

As shown in the vehicle GPS receiver for generating and outputting voice in the microprocessor of the present invention, the antenna 100 and the GPS receiving module 101, the intersections on the road, the tunnel in order to receive the GPS signal from the satellite in real time Location data such as a bridge, a dangerous place, and the like stored in advance in the memory 103 built-in or external to the microprocessor 102 in order to compress and store the corresponding voice, and location data of a GPS satellite signal received in real time. Compared with the data, in order to output the voice to be guided to retrieve the voice signal compressed and stored in the memory 103 to restore and output as a PWM signal, and microprocessor 102 for controlling various other convenient devices and And a low pass filter 105 for shaping the waveform of the audio signal output as a PWM signal, and a sufficient size of the audio signal. The hayeoseo a speaker 107 for the audio amplifier unit 106, and outputting the amplified sound to be amplified.

In the present invention, since the program of the microprocessor 102 is a digital code method of converting an instantaneous magnitude of an analog signal into a code string having a fixed length, a PCM (Pulse Code Modulation) that takes up a large amount of memory Adaptive differential pulse code modulation (ADPCM) is a method of adaptively changing the step size of quantization according to the amplitude of a signal in a differential pulse code modulation (DPCM). ; compressing by adaptive differential pulse code modulation) and storing it in the memory 103, and when outputting voice guidance, retrieve the data stored by the ADPCM method, restore the data to PCM data, and control and output the same as the original sound. You will get a voice output.

3 shows an example of a method of compressing an audio signal into ADPCM data.

As shown in this figure, a voice signal of PCM data is converted into ADPCM data and compressed. This means that when converting PCM data that changes over time to ADPCM data, the size of the first sound source is used as it is, but from the second time, the compression ratio can be increased by using a difference from the sound source immediately before.

That is, as shown in the following table, the first ADPCM data is used as the first sound source of PCM data, the second ADPCM data is generated by subtracting the first data from the PCM second data, and the third ADPCM data is PCM third data The second ADPCM data is generated by subtracting from the second data. The fourth ADPCM data is generated by subtracting the third data from the fourth data of the PCM. Will be.

PCM data 50 60 75 95 100 95 75 60 50 Calculation method same 60-50 75-60 95-75 100-95 95-100 75-95 60-75 50-60 ADPCM data 50 10 15 20 5 -5 -20 -15 -10

In addition, the microprocessor 102 converts and compresses a voice signal of PCM data into ADPCM data for voice guidance and stores it in the memory 103. When the voice guidance is to be performed in accordance with the position of, the compressed ADPCM data is retrieved, restored to PCM data, and output as a PWM signal. A flowchart of such a program is illustrated in FIG. 4.

As shown in the figure, step 401 is a start step of starting a program operation in order for the microprocessor 102 to generate voice, and step 402 is a step of determining whether the data received from the satellite and the pre-stored position match. In step 403, when the data received from the satellite matches the pre-stored position, the corresponding data stored in the memory 103 is called. In step 404, the time for outputting at the same frequency as the frequency band of the sound source stored in the ADPCM is determined. In step 405, a start address and an end address of data stored in the memory 103 are read. In step 406, a time interrupt is set in order to restore the ADPCM data stored in the memory 103. Comparing the stored start address and the end address within the time interrupt, and step 408 If the end addresses match, the time interrupt is released and the process exits to the end step by exiting from the time interrupt. In step 407, data to be output in the memory 103 is continuously outputted if the start addresses match. The step 410 is a step of restoring the voice signal stored as ADPCM data to the PCM data. The step 411 is a step of outputting the restored sound source as a PWM signal. Step 413 is a step in which the microprocessor 102 terminates the restoration and output operation of the voice signal.

As described above, when the position of the signal received from the satellite while driving is to be voiced in accordance with the pre-stored intersection, surveillance camera, etc., the stored data is retrieved and restored as in step 410 by the program of the microprocessor 102. The process of outputting the PWM signal as shown in step 411 is illustrated in FIG. 5.

As shown in FIG. 3, in the process of FIG. 3, the voice signal of the PCM data is converted into ADPCM and compressed, and the data stored in the memory 103 is read by the program of the microprocessor 102, which is then converted into PCM data. The restoration process is as follows. As in the case of compression, the first sound source is the same size, and the second sound source is restored by adding or subtracting the second data to the previous sound source in order to convert the ADPCM data and vice versa.

That is, as shown in the following table, the first restoration data uses the first sound source of the read data as it is, the second restoration data restores the sum of the first restoration data and the second read data, and the third restoration data is the second. The restored data is summed up with the third read data and the fourth restored data is restored with the sum of the third restored data and the fourth read data, so that the restoration is completed with the same voice as the original sound.

Read data 50 10 15 20 5 -5 -20 -15 -10 Calculation method same 50 + 10 60 + 15 75 + 20 95 + 5 100-5 95-20 75-15 60 + 10 Restored data 50 60 75 95 100 95 75 60 50

The PWM signal is output as a PWM signal that adjusts the pulse width according to the size of the restored PCM data. The pulsed PWM signal is shaped through the low pass filter 105 and applied to the audio amplifier 106. After being amplified to a sufficient size, the speaker 107 can hear the voice guidance.

Accordingly, the present invention can reduce the manufacturing cost because it is possible to reduce the parts used by processing by the program of the microprocessor without separately using the voice synthesis IC to output the voice alarm sound, and the useful effect that can be further downsized It is.

Claims (2)

delete An antenna 100 and a GPS receiving module 101, a low pass filter 105, an audio amplifier 106, a speaker 107, and a memory for storing data for receiving GPS signals from a satellite ( 103, and a microprocessor 102 for controlling the entire system, converts and compresses PCM data, which is sound source data, into ADPCM data, magnetically stored in a memory 103 embedded or external to the microprocessor 102, and stored. Restoring ADPCM data to PCM data and outputting it as a PWM signal, and applying it to the low pass filter 105 to generate voice output In order to retrieve the ADPCM data stored in the above-described memory 103, restore the PCM data, and output the result as a PWM signal, the start step 401 of starting the program operation and the data received from the satellite and the pre-stored positions coincide with each other. Determining step (402), and if the data received from the satellite and the pre-stored position coincides with the step (403) of the corresponding data stored in the above-described memory 103, and at the same frequency as the frequency band of the sound source stored in ADPCM A step 404 for determining a time to output, a step 405 for reading the start address and the end address of the data stored in the memory 103 described above, and a time for restoring the ADPCM data stored in the memory 103 described above. Determining the interrupt 406, comparing the start address and the end address stored in the predetermined time interrupt (407), and if the end address coincides in the step 407 In step 408, the process proceeds to the end step by releasing the right time interrupt and exits from the time interrupt, and the data to be output is continuously read from the memory 103 described above when the start address coincides with the step 407. Step 409, restoring the voice signal stored as ADPCM data to PCM data (410), outputting the restored sound source as a PWM signal (411), and restoring work of the sound source is completed to exit from the time interruption. The microprocessor 102 is characterized in that the program of step 412 and the above-described microprocessor 102 terminate the restoration and output operation of the voice signal by the microprocessor 102 described above. Speech synthesis output method of vehicle GPS receiver.

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