Transcribe a Sony ICD-PX470 recording on a student budget.
A three-hour lecture recorded on a Sony ICD-PX470 transcribes in about 6 minutes, and your first recording has the first 20 minutes free. The PX470's MP3 files are small, about 175 MB for three hours at 128 kbps, and the $6 pack of 500 minutes covers more than eight hours of lectures at $0.72 an hour.
A small file, a long lecture
An inexpensive recorder, and a transcript to match.
Small MP3, long recording
An MP3 at 128 kbps uses about 58 MB per hour, so a three-hour lecture is around 175 MB and a full day of lectures is well under 1 GB. That is far below the 2 GB that uploads before any pack. It is still seven times the 25 MB that the OpenAI Whisper API accepts in a single request.
From the recorder to the page
Connect the PX470 to a computer by USB and it shows up as a drive; copy the MP3 and drop it in the box. On a library or lab computer, put the file in Google Drive and paste its share link, so nothing has to stay on a machine you do not own.
What eight hours costs
The $6 pack holds 500 minutes, a little over eight hours, which is a week of lectures for many courses. Two terms of lectures, around 40 hours, are 2,400 minutes and go on the $24 pack of 5,000. Credits never expire, so leftovers carry to the next term.
Placement for a clear lecture
A recorder in the front row hears the lecturer clearly and the back of the room faintly. Questions from far seats may come through thinly, while the lecturer's answer, which usually repeats the question, is captured in full. Recording from closer helps more than any setting.
Why a budget recorder still needs a plan
The recorder was cheap. The hours of replay are not.
✗ Lectures you never get back to
Three hours of MP3 on a recorder is three hours of listening before it is useful.
- Re-listening at double speed before exams
- Free tools that stop well short of three hours
- An API that refuses anything over 25 MB
- A monthly bill through term breaks
- Notes missing the worked examples
- No way to search last month
✓ Each PX470 MP3, transcribed
The file goes up as it is and comes back as text you can search before the next class.
- About 6 minutes for three hours
- The first 20 minutes free
- Over eight hours on $6
- Chapters for each topic
- Examples timestamped for replay
- TXT and DOCX for notes
Sample
A long lecture from a PX470 in the front row.
This sample is illustrative, not a recording of any real lecture. It shows a lecturer and a question from the room, timestamped from the start of a three-hour MP3.
Export
One transcript. Five clean formats.
Every pack exports all five — no format is held back for a higher tier.
Plain text
De-ummed paragraphs. Ready to paste.
SRT captions
Timed to the speech. Every video editor reads this.
WebVTT
HTML5 player + YouTube uploads.
Show notes
Formatted with chapters and pull-quotes.
Machine-readable
Timestamped text for your own tools.
Pricing
Honest pricing, no surprises.
A pack from $6 (500 minutes) opens the full transcript. After that, no subscription and no auto-renew — every tier is a one-time minute pack, and credits never expire. Buy once, use the minutes whenever you need them.
Casual pack
$6/500 min
8 hours of audio — $0.72 an hour. One-time — credits never expire.
- 500 minutes of audio
- All export formats
- Unlimited AI chat per transcript
- Executive summary & key quote
Best value
$12/2,000 min
33 hours of audio — $0.36 an hour. Credits never expire.
- 2,000 minutes of audio
- Priority queue
- All export formats
- Unlimited AI chat per transcript
Bulk pack
$24/5,000 min
83 hours of audio — $0.29 an hour. Credits never expire.
- 5,000 minutes of audio
- Priority queue
- API access for batch pipelines
- All export formats
FAQ
Sony ICD-PX470 recordings, the questions students ask.
How long does a three-hour PX470 lecture take to transcribe?
Around 6 minutes: three hours at about 2 minutes per hour of audio. A small MP3 also uploads quickly, so the whole trip is usually a few minutes.
How much does a three-hour PX470 lecture cost?
Three hours is 180 minutes, on the $6 pack of 500 with 320 left, which is more than five further hours. The first 20 minutes of your first recording are free, and a longer one is previewed before you buy.
Is a PX470 MP3 small enough?
Easily. One file can be up to 5 GB or 10 hours, and before your first pack uploads go up to 2 GB. A three-hour MP3 is around 175 MB.
Do I need to split a long recording from the PX470?
Not under 10 hours. A single upload gives one transcript and one timeline. If the recorder saved a lecture as two files, upload both and you get a transcript for each.
What languages can lectures be in?
The language is detected for you, from 99. Lectures that switch between English and Tagalog in one recording are handled. Cebuano and other regional Philippine languages are supported too, but accuracy trails the major languages, so treat that text as a fast first draft and plan one review pass.
What can I download, and who has access to the recording?
Text comes out as TXT, DOCX, SRT, VTT and JSON. Recordings are transcribed on our own servers and are never used for training, and you can delete a lecture and its text at any time.
Related
Other recorders and long lectures
Upload this week's lecture. Start with 20 minutes free.
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