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เรียกใช้ใน Google Colab
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ดูแหล่งข้อมูลใน GitHub
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ตั้งแต่ Gemma 3n เป็นต้นไป คุณจะใช้เสียงในพรอมต์และเวิร์กโฟลว์ได้โดยตรง เสียงและภาษาพูดเป็นแหล่งข้อมูลที่สำคัญสำหรับการจับเจตนาของผู้ใช้ การบันทึกข้อมูลเกี่ยวกับโลกรอบตัวเรา และการทำความเข้าใจ ปัญหาเฉพาะที่ต้องแก้ไข
คู่มือนี้จะแสดงภาพรวมของความสามารถในการประมวลผลเสียงของ Gemma 4 ซึ่งรวมถึงการจดจำคำพูดอัตโนมัติ (ASR) การแปล และการทำความเข้าใจคำพูดทั่วไป
Notebook นี้จะทำงานบน GPU T4
ติดตั้งแพ็กเกจ Python
ติดตั้งไลบรารี Hugging Face ที่จำเป็นสำหรับการเรียกใช้โมเดล Gemma และส่งคำขอ
# Install PyTorch & other librariespip install torch accelerate# Install the transformers librarypip install transformers
โหลดโมเดล
ใช้transformersไลบรารีเพื่อสร้างอินสแตนซ์ของ processor และ model โดยใช้คลาส AutoProcessor และ AutoModelForImageTextToText ตามที่แสดงในตัวอย่างโค้ดต่อไปนี้
MODEL_ID = "google/gemma-4-E2B-it" # @param ["google/gemma-4-E2B-it","google/gemma-4-E4B-it", "google/gemma-4-31B-it", "google/gemma-4-26B-A4B-it"]
from transformers import AutoProcessor, AutoModelForMultimodalLM
model = AutoModelForMultimodalLM.from_pretrained(MODEL_ID, dtype="auto", device_map="auto")
processor = AutoProcessor.from_pretrained(MODEL_ID)
Loading weights: 0%| | 0/2011 [00:00<?, ?it/s]
ข้อมูลเสียง
ข้อมูลเสียงดิจิทัลมีหลายรูปแบบและหลายระดับความละเอียด รูปแบบเสียงจริงที่คุณใช้กับ Gemma ได้ เช่น รูปแบบ MP3 และ WAV จะกำหนดโดยเฟรมเวิร์กที่คุณเลือกเพื่อแปลงข้อมูลเสียงเป็นเทนเซอร์ ต่อไปนี้คือข้อควรพิจารณาที่เฉพาะเจาะจงบางประการในการเตรียมข้อมูลเสียงสำหรับการประมวลผลด้วย Gemma
- ค่าใช้จ่ายโทเค็น: เสียงทุกๆ 1 วินาทีจะใช้โทเค็น 25 รายการสำหรับ Gemma 4 (โทเค็น 6.25 รายการสำหรับ Gemma 3n)
- ความยาวคลิป: เสียงรองรับความยาวสูงสุด 30 วินาที
- ช่องเสียง: ระบบจะประมวลผลข้อมูลเสียงเป็นช่องเสียงเดียว หากใช้เสียงแบบหลายช่อง เช่น ช่องซ้ายและขวา ให้พิจารณาลดข้อมูลให้เหลือช่องเดียวโดยการนำช่องออกหรือ รวมข้อมูลเสียงเป็นช่องเดียว
- การเข้ารหัสทางเทคนิค:
- อัตราการสุ่มตัวอย่าง: 16 kHz โดยใช้เฟรม 32 มิลลิวินาที
- ความลึกของบิต: รูปแบบ Float 32 บิต โดยตัวอย่างจะได้รับการปรับให้เป็นมาตรฐานภายในช่วง [-1, 1]
หากข้อมูลเสียงที่คุณวางแผนจะประมวลผลแตกต่างจากอินพุต การประมวลผลอย่างมาก โดยเฉพาะในแง่ของช่อง อัตราตัวอย่าง และความลึกของบิต ให้ลองทำการสุ่มตัวอย่างใหม่หรือตัดแต่งข้อมูลเสียงเพื่อให้ตรงกับความละเอียดของข้อมูล ที่โมเดลจัดการ
การเข้ารหัสเสียง
แม้ว่าไลบรารีระดับสูง (เช่น Hugging Face AutoProcessor) มักจะจัดการการประมวลผลเสียงล่วงหน้าโดยอัตโนมัติ แต่บางครั้งคุณอาจต้องใช้การเข้ารหัสที่กำหนดเอง
เมื่อเข้ารหัสข้อมูลเสียงด้วยการติดตั้งโค้ดของคุณเองเพื่อใช้กับ Gemma คุณควรทําตามกระบวนการแปลงที่แนะนํา หากคุณทำงานกับไฟล์เสียงที่เข้ารหัสในรูปแบบที่เฉพาะเจาะจง เช่น ข้อมูลที่เข้ารหัส MP3 หรือ WAV
คุณต้องถอดรหัสไฟล์เหล่านี้เป็นตัวอย่างก่อนโดยใช้ไลบรารี เช่น ffmpeg เมื่อถอดรหัสข้อมูลแล้ว ให้แปลงเสียงเป็นรูปแบบคลื่นแบบช่องเดียว 16 kHz float32
ในช่วง [-1, 1] เช่น หากคุณกำลังทำงานกับไฟล์ WAV ที่เป็นจำนวนเต็ม PCM แบบ 16 บิตที่มีการลงนามแบบสเตอริโอที่ 44.1 kHz ให้ทำตามขั้นตอนต่อไปนี้
- สุ่มตัวอย่างข้อมูลเสียงอีกครั้งเป็น 16 kHz
- ดาวน์มิกซ์จากสเตอริโอเป็นโมโนโดยหาค่าเฉลี่ยของ 2 ช่อง
- แปลงจาก int16 เป็น float32 แล้วหารด้วย 32768.0 เพื่อปรับขนาดให้อยู่ในช่วง [-1, 1]
การแปลงเสียงพูดเป็นข้อความ
Gemma 4 E2B และ E4B ได้รับการฝึกให้จดจำคำพูดได้หลายภาษา ซึ่งช่วยให้คุณถอดเสียงอินพุตเสียงเป็นข้อความในภาษาต่างๆ ได้ ตัวอย่างโค้ดต่อไปนี้แสดงวิธีเขียนพรอมต์โมเดลให้ถอดเสียงข้อความจากไฟล์เสียงโดยใช้ Hugging Face Transformers
RESOURCE_URL_PREFIX = "https://raw.githubusercontent.com/google-gemma/cookbook/refs/heads/main/Demos/sample-data/"
messages = [
{
"role": "user",
"content": [
{"type": "text", "text": "Transcribe the following speech segment in its original language. Follow these specific instructions for formatting the answer:\n* Only output the transcription, with no newlines.\n* When transcribing numbers, write the digits, i.e. write 1.7 and not one point seven, and write 3 instead of three."},
#{"type": "text", "text": "Transcribe the following speech segment in English into English text. Follow these specific instructions for formatting the answer:\n* Only output the transcription, with no newlines.\n* When transcribing numbers, write the digits, i.e. write 1.7 and not one point seven, and write 3 instead of three."},
{"type": "audio", "audio": f"{RESOURCE_URL_PREFIX}journal1.wav"},
]
}
]
input_ids = processor.apply_chat_template(
messages,
add_generation_prompt=True,
tokenize=True, return_dict=True,
return_tensors="pt",
)
input_ids = input_ids.to(model.device, dtype=model.dtype)
outputs = model.generate(**input_ids, max_new_tokens=64)
text = processor.batch_decode(
outputs,
skip_special_tokens=False,
clean_up_tokenization_spaces=False
)
print(text[0])
<bos><|turn>user Transcribe the following speech segment in its original language. Follow these specific instructions for formatting the answer: * Only output the transcription, with no newlines. * When transcribing numbers, write the digits, i.e. write 1.7 and not one point seven, and write 3 instead of three.<|audio><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><audio|><turn|> <|turn>model I woke up early today feeling really fresh the morning light was beautiful and I enjoyed a nice cup of coffee<turn|>
messages = [
{
"role": "user",
"content": [
{"type": "text", "text": "Give me a concise overview of these audio files."},
{"type": "text", "text": "journal1:"},
{"type": "audio", "audio": f"{RESOURCE_URL_PREFIX}journal1.wav"},
{"type": "text", "text": "journal2:"},
{"type": "audio", "audio": f"{RESOURCE_URL_PREFIX}journal2.wav"},
{"type": "text", "text": "journal3:"},
{"type": "audio", "audio": f"{RESOURCE_URL_PREFIX}journal3.wav"},
{"type": "text", "text": "journal4:"},
{"type": "audio", "audio": f"{RESOURCE_URL_PREFIX}journal4.wav"},
{"type": "text", "text": "journal5:"},
{"type": "audio", "audio": f"{RESOURCE_URL_PREFIX}journal5.wav"},
]
}
]
input_ids = processor.apply_chat_template(
messages,
add_generation_prompt=True,
tokenize=True, return_dict=True,
return_tensors="pt",
)
input_ids = input_ids.to(model.device, dtype=model.dtype)
outputs = model.generate(**input_ids, max_new_tokens=1024)
text = processor.batch_decode(
outputs,
skip_special_tokens=False,
clean_up_tokenization_spaces=False
)
print(text[0])
<bos><|turn>user Give me a concise overview of these audio 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<|turn>model Here is a concise overview of the audio files: **Journal 1:** The speaker felt refreshed, enjoyed a morning ride, a cup of coffee, and was generally happy. **Journal 2:** The speaker spent the afternoon at the park, which was a perfect day for a walk, and enjoyed watching the cherry blossoms. **Journal 3:** The speaker finished the day with a good book, feeling grateful for simple moments and ready for more. **Journal 4:** The speaker returned from work, admiring the sunset, and enjoyed a clear view from the train. **Journal 5:** The speaker had a great lunch with an old friend, enjoyed catching up, and felt happy about the day.<turn|>
การแปลเสียงพูดอัตโนมัติ
Gemma 4 E2B และ E4B ได้รับการฝึกสำหรับงานแปลเสียงพูดแบบหลายภาษา ซึ่งช่วยให้คุณแปลเสียงพูดเป็นภาษาอื่นได้โดยตรง ตัวอย่างโค้ดต่อไปนี้แสดงวิธีเขียนพรอมต์โมเดลให้แปลเสียงพูดเป็นข้อความโดยใช้ Hugging Face Transformers
messages = [
{
"role": "user",
"content": [
{"type": "text", "text": "Transcribe the following speech segment in English, then translate it into Korean. When formatting the answer, first output the transcription in English, then one newline, then output the string 'Korean: ', then the translation in Korean."},
{"type": "audio", "audio": "https://ai.google.dev/gemma/docs/audio/roses-are.wav"},
]
}
]
input_ids = processor.apply_chat_template(
messages,
add_generation_prompt=True,
tokenize=True, return_dict=True,
return_tensors="pt",
)
input_ids = input_ids.to(model.device, dtype=model.dtype)
outputs = model.generate(**input_ids, max_new_tokens=64)
text = processor.batch_decode(
outputs,
skip_special_tokens=False,
clean_up_tokenization_spaces=False
)
print(text[0])
<bos><|turn>user Transcribe the following speech segment in English, then translate it into Korean. When formatting the answer, first output the transcription in English, then one newline, then output the string 'Korean: ', then the translation in Korean.<|audio><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><audio|><turn|> <|turn>model Roses are red, violets are blue. Korean: 장미는 빨갛고, 제비꽃은 파랗다.<turn|>
การแปลเสียงพูดอัตโนมัติ / การรู้จำคำพูดอัตโนมัติ
ลองทำด้วยตัวเอง
pip install ipywebrtcกดปุ่มวงกลมแล้วเริ่มพูด คลิกปุ่มวงกลมอีกครั้งเมื่อเสร็จแล้ว วิดเจ็ตจะเริ่มเล่นสิ่งที่บันทึกไว้ทันที
from google.colab import output
output.enable_custom_widget_manager()
from ipywebrtc import AudioRecorder, CameraStream
camera = CameraStream(constraints={'audio': True,'video':False})
recorder = AudioRecorder(stream=camera)
recorder
AudioRecorder(audio=Audio(value=b'', format='webm'), stream=CameraStream(constraints={'audio': True, 'video': …
แปลงไฟล์ webm เป็นรูปแบบ wav ที่ PyTorch เข้าใจ
with open('/content/recording.webm', 'wb') as f:
f.write(recorder.audio.value)
!ffmpeg -i /content/recording.webm /content/recording.wav -y
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100
Input #0, matroska,webm, from '/content/recording.webm':
Metadata:
encoder : Chrome
Duration: 00:00:04.02, start: 0.000000, bitrate: 131 kb/s
Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
Stream mapping:
Stream #0:0 -> #0:0 (opus (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to '/content/recording.wav':
Metadata:
ISFT : Lavf58.76.100
Stream #0:0(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s16, 768 kb/s (default)
Metadata:
encoder : Lavc58.134.100 pcm_s16le
size= 383kB time=00:00:04.01 bitrate= 779.7kbits/s speed=60.6x
video:0kB audio:382kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.019914%
ASR
messages = [{
"role": "user",
"content": [
{"type": "text", "text": "Transcribe the following speech segment in its original language. Follow these specific instructions for formatting the answer:\n* Only output the transcription, with no newlines.\n* When transcribing numbers, write the digits, i.e. write 1.7 and not one point seven, and write 3 instead of three."},
{"type": "audio", "audio": "/content/recording.wav"},
]
}]
input_ids = processor.apply_chat_template(
messages,
add_generation_prompt=True,
tokenize=True, return_dict=True,
return_tensors="pt",
)
input_ids = input_ids.to(model.device, dtype=model.dtype)
outputs = model.generate(**input_ids, max_new_tokens=64)
text = processor.batch_decode(
outputs,
skip_special_tokens=False,
clean_up_tokenization_spaces=False
)
print(text[0])
<bos><|turn>user Transcribe the following speech segment in its original language. Follow these specific instructions for formatting the answer: * Only output the transcription, with no newlines. * When transcribing numbers, write the digits, i.e. write 1.7 and not one point seven, and write 3 instead of three.<|audio><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><audio|><turn|> <|turn>model How can I get to the station?<turn|>
AST
messages = [{
"role": "user",
"content": [
{"type": "text", "text": "Transcribe the following speech segment in English, then translate it into Korean. When formatting the answer, first output the transcription in English, then one newline, then output the string 'Korean: ', then the translation in Korean."},
{"type": "audio", "audio": "/content/recording.wav"},
]
}]
input_ids = processor.apply_chat_template(
messages,
add_generation_prompt=True,
tokenize=True, return_dict=True,
return_tensors="pt",
)
input_ids = input_ids.to(model.device, dtype=model.dtype)
outputs = model.generate(**input_ids, max_new_tokens=64)
text = processor.batch_decode(
outputs,
skip_special_tokens=False,
clean_up_tokenization_spaces=False
)
print(text[0])
<bos><|turn>user Transcribe the following speech segment in English, then translate it into Korean. When formatting the answer, first output the transcription in English, then one newline, then output the string 'Korean: ', then the translation in Korean.<|audio><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><|audio|><audio|><turn|> <|turn>model How can I get to the station? Korean: 역에 어떻게 가나요?<turn|>
สรุปและขั้นตอนถัดไป
ในคู่มือนี้ คุณได้เรียนรู้วิธีประมวลผลเสียงโดยใช้โมเดล Gemma 4 ตัวอย่างแสดงวิธีใช้การแปลงเสียงพูดเป็นข้อความ (ASR) เพื่อถอดเสียงภาษาพูด รวมถึงการแปลเสียงพูดอัตโนมัติ (AST) เพื่อแปลเสียงพูดเป็นภาษาอื่นโดยตรง นอกจากนี้ คุณยังได้เห็นวิธีบันทึกเสียงจากไมโครโฟนในสภาพแวดล้อมของ Notebook เพื่อประมวลผลด้วย
ดูข้อมูลเพิ่มเติมได้ในเอกสารประกอบต่อไปนี้
เรียกใช้ใน Google Colab
ดูแหล่งข้อมูลใน GitHub