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Epson S1V3G340 Application Note
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Epson S1V3G340 Application Note

Epson S1V3G340 Application Note

Speech synthesizer sound input/output
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Application Note
Sound Input/Output
application note
Rev.1.1

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Summary of Contents for Epson S1V3G340

  • Page 1 Application Note Sound Input/Output application note Rev.1.1...
  • Page 2 Epson evaluation board/kit or development tool is intended for use by an electronic engineer and is not a consumer product. The user should use it properly and in a safe manner. Epson dose not assume any responsibility or liability of any kind of damage and/or fire coursed by the use of it. The user should cease to use it when any abnormal issue occurs even during proper and safe use.

  • Page 3: Table Of Contents

    Resonance Tubes ......................17 6.2.3 Resonance of Buzzer Metal Plate .................. 18 Sound input by microphone .................19 Appendix A Spice Model of Recommended Circuit for Electromagnetic Buzzer 20 Revision History Table ....................23 Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 4: Overview

    Overview Overview This application note is a reference document for voice input/output in Epson's Speech LSIs and Voice/Sound MCUs (hereinafter called "Voice/Sound devices"). Some functions may not be supported depending on the voice device you are using. Please check the applicable models in Table 1 first, and then refer to the appropriate chapter for your purpose.

  • Page 5: Sound Generation

    Sound generation Sound generation Sound ROM data to be played back on Epson Voice/Sound devices is created using the Epson Voice Data Creation PC Tool (ESPER2) provided by Epson. For details, please refer to the ESPER2 Setup Guide and the ESPER2 Simple Manual.

  • Page 6: Sound Output By Speaker

    Sound Output by Speaker Recommended Circuit for Speaker Connection Figure 3.1.1 and Figure 3.1.2 show the recommended circuits for connection when using Epson Voice/Sound devices with speakers. Figure 3.1.1 shows a reference circuit diagram for a two-pin output from a Voice/Sound device, and Figure 3.1.2 shows a one-pin output.

  • Page 7: Low-Pass Filter (Lpf)

    Figure 3.1.2 Recommended circuit for speaker connection (1 pin) *The sound output pins names in Fig. 3.1.1, 3.1.2 differ for each model. Please refer to the technical manual of each model. Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 8: Speaker Amplifier Selection

    Consider the above generally recognized advantages and disadvantages to select the appropriate speaker amplifier for your application. Table 3.2.1 Comparison of Class-AB/Class-D speaker amplifiers Class-AB Speaker Amplifier Class-D speaker amplifier Output Analog Digital (PWM) Distortion Medium Efficiency High Heat generation Large Small Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 9: Radiated Noise Countermeasures

    ���� = ≒ 152(������) 2��√ ( 33(����) ) ∗ (0.033(����)) The cutoff frequency is 152 kHz, which can be counteracted by cutting PWM carrier frequency components of the order of MHz. Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 10: Sound Output By Buzzer

    Epson Voice/Sound devices use piezoelectric buzzers (piezoelectric sounders) and electromagnetic buzzers to play back voice sound and melody (hereinafter referred to as "Buzzer voice/melody") with Epson's proprietary technology. This chapter shows recommended external amplifier circuits and other information for playing sound on a buzzer when using Epson Voice/Sound devices.

  • Page 11: High Current In Piezoelectric Buzzer

    The names of the buzzer sound output pins shown in Figure 4.2.1 differ for each model. Please refer to Table 4.2.2 and Table 4.2.3 to check the output pins to be connected to the amplifier circuit. Seiko Epson Corporation Sound Input/Output Application Note...
  • Page 12 (TDK Corporation) Table 4.2.2 Sound output pins for electromagnetic buzzer 4-pin outputs(S1V3F351) Model Output mode configuration Sound output pin S1V3F351 Set Sound_Out_Sel to 0x06 in the BUZZER_OUT_P2 ISC_SOUND_OUTPUT_CONFIG_REQ message BUZZER_OUT_P BUZZER_OUT_N2 BUZZER_OUT_N Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 13: 2-Pin Output

    Please refer to Table 4.2.4, 4.2.5 and 4.2.6 to check the output pins to be connected to the amplifier circuit. VDD1 Sound output pin P Voice/Sound Device VDD1 Sound output pin N Figure 4.2.2 Amplification circuit for connecting an electromagnetic buzzer 2-pin output Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)
  • Page 14 Any of the input/output ports excluding the sound output pins (P50, P51, P03, P04, P05, P06) S1C31D51 Any of the input/output ports excluding the sound output pins (P50, P51, P03, P04, P05, P06) Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 15: Through-Current In Bipolar Transistors

    (R1 to R4). When selecting a bipolar transistor, the peak collector current and current rating must be greater than the through-currents shown in Table 4.2.1. Buzzer Selection The sound quality of the Epson Voice/Sound devices to realize the Buzzer voice/melody also depends on the characteristics of the buzzer to be selected. ⚫...
  • Page 16 In the case of a three-terminal buzzer as shown in Figure 4.3.1, only terminals (a) and (c) in the figure can be used for control. Terminal (b) may be left unused or connected to terminal (a). Figure 4.3.1 Three-terminal buzzer Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 17: Precautions In Board Design

    Class-D amplifier and the speaker should be as short as possible. ◆ Since the electromagnetic buzzer is current driven, the wiring of the buzzer peripheral circuit should be as thick as possible. Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 18: Precautions In Enclosure Design

    Same length recommended acoustic material Speaker Rear enclosure Figure 6.1.2 Example of rear enclosure Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 19: Buzzer Enclosure Design

    �� �� ∗ ඨ ���� = 2�� �� 0 �� ����: Resonant frequency Figure 6.2.1.2 Resonance frequencies of Helmholtz resonance with a resonance box ��: Speed of sound Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 20: Resonance Tubes

    If the speed of sound �� = 340 (m/s) and ℓ = 15 (cm), In Figure 6.2.2(a), 340/(4*0.15) = 567(Hz) In Figure 6.2.2(b), 340/(4*0.15/3) = 1,700 (Hz) In Figure 6.2.2(c), 340/(4*0.15/5) = 2,833 (Hz) Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 21: Resonance Of Buzzer Metal Plate

    Therefore, it is necessary to design the housing and select the metal plate assuming this resonance frequency shift. Please contact the buzzer manufacturer for details. Figure 6.2.3 Piezoelectric buzzer (metal plate) Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 22: Sound Input By Microphone

    *MAX4466 (manufactured by Maxim) https://www.analog.com/en/products/max4466.html (*Information as of September 2023) 2kΩ 0.1uF 1 MΩ 2kΩ Condenser microphone 0.01uF MAX4466 1 MΩ 10kΩ 100kΩ 100pF Figure 7.1 Standard Circuit Using MAX4466 (Maxim) Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 23: Appendix A Spice Model Of Recommended Circuit For Electromagnetic Buzzer

    The file saved in ③ is loaded into LTSpice for simulation. ④ (This example is based on supply voltage (VDD1) = 3V, DC resistance = 4.7kΩ, maximum current = 40mA, DC resistance = 70Ω.) Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)
  • Page 24 -1728 -272 r0 WINDOW 123 0 0 Left 2 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=10m SYMATTR InstName V1 SYMATTR Value PULSE(0 3.3 0 0.01u 0.01u 32u 64u 40) Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)
  • Page 25 SYMBOL npn -416 -272 R0 SYMATTR InstName Q4 SYMATTR Value BC817DS TEXT -1736 -24 Left 2 ! .tran 5m TEXT -1544 -24 Left 2 ! .include BC807DS.lib TEXT -1544 24 Left 2 ! .include BC817DS.lib Seiko Epson Corporation Sound Input/Output Application Note (Rev. 1.1)

  • Page 26: Revision History Table

    Revision History Table Revision History Table appendix -1 Revised contents (including old contents) Rev. No. Date Page Classification and reason for revision Rev. 1.0 Sep. 25, 2023 All pages Newly enacted Rev. 1.1 Dec. 25, 2024 P.3 - P.11 Addition Added Table 3.1.1, 3.1.2, 4.1.2, 4.1.3, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5 and 4.2.6.
  • Page 27 Epson Europe Electronics GmbH Riesstrasse 15, 80992 Munich, Germany Phone: +49-89-14005-0 FAX: +49-89-14005-110 Epson Taiwan Technology & Trading Ltd. 15F, No.100, Songren Rd, Sinyi Dist, Taipei City 110. Taiwan Phone: +886-2-8786-6688 Epson Singapore Pte., Ltd. 438B Alexandra Road, Block B Alexandra TechnoPark, #04-01/04, Singapore 119968...

This manual is also suitable for:

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