Common voice chips and the small eight-foot board audio chip
Eight feet is the main voice chip package DIP8 hard or SOP8, and soft-line 8-pin COB package of voice chips. Chips total of 8 pins, such as AC8040, there DIP8, SOP8, DIP14 (14 pins of voice chip), SOP16 (16 pins of the voice chip). AC8020 has SOP8 DIP8 and two packages, AC8080 was DIP16 (16 pins of the voice chip).
OTP chip to the main play several products, and its application circuit is simple, inexpensive, have great market share.
There are other DIP18PIN the DIP24 feet, DIP28 pin voice chip, while demanding and partial in the popular area of the application of a certain market.
COB products, Shenzhen Central core Semiconductor Co., Ltd. offers battery 3V CR2032 program AC80A program, AC80E, AC80F the 2032 program with a foot, AC80B squeeze box COB programs, etc..
Recording products are AC60E5 and AC60E3 charged with ISD is not charged to reservations and reservation sound recording products RTS0076, such as 6 seconds to play-based program.
9V, 12V, 24V high voltage audio chip solutions are used in public transportation vehicles and consumer electronics. Simultaneously push 2W and 4W amplifier speaker programs and so on.
Introduction to integrated circuit voice application knowledge from the basic knowledge, information and practical examples of circuits such as starting, so that more fans in the learning and mastery of some electronic knowledge and skill, early access to the voice chip industry (www.atchip.net).
We normally see and access to voice integrated circuits, most of its packages of plastic dual in-line package integrated circuit (DIP), commonly known as hard-package circuit, according to the number of pins divided into 8 feet, 14 feet, 16 feet, etc., each pin has a different function. Usually lead more integrated circuit chips, the greater the volume, the circuit functions are stronger, the higher the value, of course. Figure 1 (b) is printed circuit board package (COB), commonly known as soft-package circuit, which is the integrated circuit chip package and printed circuit board directly to a simple semiconductor integrated device. Soft packaging circuit technology is simple, short production cycle, lower cost, and can be repaired many times, so the passing rate is very high. Central core companies commonly used in soft voice chip package circuit.
Voice integrated circuit chip, also known as die, it uses multi-layer mask technology and digital voice circuit unit mask voice message at the semiconductor chip, the manufacturing process is very complicated, the production cycle for about 45 days.
Speech signal sampling frequency is good or bad decision quality voice circuits the most important factor. In general, the sampling frequency must be a voice frequency band width of 2 or more letters, for example, to preserve the highest frequency 6KHz bandwidth spectrum, then the minimum sampling frequency must be 2 × 6KHz = 12KHz. Usually line bandwidth 3KHz, if the phone sound quality prevail, 7KHz the sampling frequency can meet the requirements, and deal with the general phoneme, with 12KHz sampling can be essential to achieve high-fidelity sound quality level. The number of voice circuits a variety of synthesis methods, the most commonly used methods for the clear analysis of shape memory synthesis method and parameters.
AC8040 voice circuit below to an example, the main parameters of voice circuits and circuits for various applications.
Shows 40 seconds of voice type AC8040 integrated chip pin graphs, table 3 is that it's pin coordinates data
AC8040-DIP8 pin diagram:
PIN AC8040 pin
1
TG2
2
TG1
3
TG5
4
VSS
5
PWM2/DAC
6
PWM1
7
VDD5
8
VDD
Voice IC trigger level is divided into High and Low 2, AC8040 is high trigger.
Next, several applications introduced AC8040 circuit for advanced users.
1. Parallel application circuit shown in Figure 7, the two or more pieces of the same audio content is not connected to the output of the circuit, circuit and connection method. Application of this parallel circuit, you can expand the number of voice segments.
2. Series application circuit shown in Figure 8, the two or more pieces of audio content with a different termination circuit output, LED output FLAG and the next one circuit connected to the trigger terminal KEY (light emitting diode output mode should be selected 3 above), the first one circuit of the output signal as the first two circuits of the control trigger signal, two-level circuit in series before and after the control mode. This application circuit can not only extend the length of each piece of voice, but also simplify the circuit. For example: the first a circuit with 4 different storage statement and request broadcast added after each statement is a piece of music, you can use this serial control circuit.
3. Automatic power-play circuit application circuit shown in Figure 9, the circuit is different from the trigger end in the IC between KEY and VSS incorporates a 0.1μ F capacitor and 1.2MΩ resistance, when the circuit switched on, due to the role of capacitance , IC is instantly triggered, voice playback to automatically stop working.
4. The power circuit loop circuit shown in Figure 10, when connected directly to the trigger side KEY VSS, when switched on, the circuit automatically loop until the power off.
5. Adjustable volume application circuit 11, an external audio output AUD 1KΩ trimming resistors and 10μ F capacitor, which can change the transistor's input voltage, in order to achieve the purpose of adjusting the volume.
6. Differential amplifier circuit shown in Figure 12, type NPN silicon transistor from the 8050 and 8550-type silicon transistor PnP and IN4148 Rectifier diodes constitute transistor differential amplifier circuit, the circuit output of the voice is loud.
7. External power amplifier circuit shown in Figure 13, through 10KΩ potentiometer sliding contact, which can connect LM386, TDA2822 power amplifier integrated circuits, etc., in order to obtain greater output power.
Information articles - ring core Semiconductor
Worldwide, China is a big country voice production of integrated circuits, but also voice circuit power consumption. Voice IC production base mainly in China, Taiwan, Hong Kong, Shenzhen and Guangzhou. There are ISD1806/ISD1700/ISD1730/ISD1810 voice circuit current series and AC8020, AC80F, AC80E series. This series can be divided into several digital pulse code modulation speech synthesis series, adaptive pulse code speech synthesis series, speech synthesis and voice + music series, series and array microprocessor speech synthesis speech synthesis series five. A description of each circuit of the five series of voice information for readers reference.
Digital pulse code modulation speech synthesis series digital pulse code modulation is the analog voice signal into a digital signal that is sampled on the voice waveform, and then by analog / digital (A / D) conversion, the final value of the sample into "0", "1" number sequence. This is the most commonly used method of speech synthesis.
Voice + Music Speech Synthesis Series This series is mainly used in speech synthesis circuit toy products. It can take voice and music mixing player mode, you can use all the way (or road) Play voice, another way (or road) Play music. Table 3 is a list of the series of commonly used circuits. The series circuit of the power supply voltage of 2.4 ~ 5V, operating current is 200μA, quiescent current is 1μA. Figure 4 is a typical application circuit in the series.
Array Speech Synthesis of speech synthesis circuit used in the series four or four or more input output matrix and the keyboard. The series also can use plug-in voice circuit microprocessor (CPU) means, to achieve statement spelling and so on.
LCD MCU Series This series of speech synthesis speech synthesis circuit embedded microprocessor, LCD drivers, clock oscillators, input and output ports, memory and multi voice audio signal amplifier circuit unit. The series circuit is mainly used for voice clock, thermometer, electronic calendar, intelligent voice toys.
Semiconductor Co., Ltd. Shenzhen ring core application to provide information on some products
From the circuit theory, components specifications and use various types of voice integrated circuits such as introducing an application example. Voice circuits to allow beginners to have a more in-depth knowledge and understanding.
1. Light-control voice circuits, light control circuit can be divided into sound and light dark to light when the ring down of two types:
For more information go to: http://www.atchip.com/dsp/ACGuangkonggm.asp
2. "Bite calls" the doorbell voice circuits.
3. Flag-raising details of the national anthem voice circuit
Information go to: http://www.atchip.net/Voiceic/ICData_view.asp?id=23
4. Teach standard Hanyu Pinyin pronunciation circuit board
