Talk 15 seconds in various

CD audio: 44100 samples/sec (44.1kHz) * 16 bits/sample * 2 channel (stereo) = 176 KB/sec (=10.5 MB/min) = 1411 kbps (=1.4 Mbps)

15 seconds sound clip sample rate (Hz) sample size (bits) # channels kbps .wav filesize
stereo 16-bit 44.1kHz → 1411 kbps 44100 16 2 (stereo) 1411 2585 KB
mono 16-bit 44.1kHz → 705 kbps 44100 16 1 (mono) 705 1293 KB
mono 16-bit 8kHz → 128 kbps 8000 16 1 128 235 KB
mono 8-bit 8kHz → 64 kbps 8000 8 1 64 118 KB Standard digital telephone: DS0.
mono 8-bit 4kHz → 32 kbps 4000 8 1 32 59 KB
mono 8-bit 1kHz → 8 kbps 1000 8 1 8 15 KB but sounds "better" in Media Player

15 seconds sound clip	sample rate (Hz)	sample size (bits)	# channels	kbps	.wav filesize
stereo 16-bit 44.1kHz → 1411 kbps	44100	16	2 (stereo)	1411	2585 KB
mono 16-bit 44.1kHz → 705 kbps	44100	16	1 (mono)	705	1293 KB
mono 16-bit 8kHz → 128 kbps	8000	16	1	128	235 KB
mono 8-bit 8kHz → 64 kbps	8000	8	1	64	118 KB	Standard digital telephone: DS0.
mono 8-bit 4kHz → 32 kbps	4000	8	1	32	59 KB
mono 8-bit 1kHz → 8 kbps	1000	8	1	8	15 KB	but sounds "better" in Media Player

Compression

above 15 secs talk: CD → Ogg	192 KB (13x)
Bach 10 secs CD-quality .wav	1729 KB
same Bach 10 secs .ogg compression	194 KB (9x)
440Hz sine wave 10 secs CD-quality .wav	1723 KB
same 440Hz sine wave 10 secs .ogg compression	30 KB (57x)

tintinnabulation

Model 500 TelephoneRing.ogg 2 different bells: 2 secs ring, 4 secs pause.

Two rings' waveforms. ~3 secs. One ring's spectrogram. ~3 secs.

(Click for larger image)
44.1kHz @1 pixel width /sample * 3sec = 132K pixels wide image needed.
Each ring is unique.
(Click for fullsize image)
20 Hz: each bell struck 10/sec → Vertical lines
Main energy 500–600 Hz: fundamental frequency (primary tuned tone) of the bells.
Horizontal lines are harmonics (overtones): continue to resonate and ring for a short time (decay).

Zoom in to an above waveform to see samples:

Record: only how much the mic's diaphragm was pushed in by higher pressure or pulled out by lower pressure at each sample instance. 16-bit sample size: 32K levels of positive and 32K of negative. CD: 1s: 64K^44K (≈∞) one-second "sounds"
Play: DAC turns the numbers into a smooth, continuous electrical signal which drives the speaker cone. which moves back and forth in a smooth, continuous motion that matches the original sound wave.

Two rings' waveforms. ~3 secs.	One ring's spectrogram. ~3 secs.
(Click for larger image) 44.1kHz @1 pixel width /sample * 3sec = 132K pixels wide image needed. Each ring is unique.	(Click for fullsize image) 20 Hz: each bell struck 10/sec → Vertical lines Main energy 500–600 Hz: fundamental frequency (primary tuned tone) of the bells. Horizontal lines are harmonics (overtones): continue to resonate and ring for a short time (decay).

Spectrogram: time vs frequency (pitch) vs intensity [colors]
"nineteenth century"

(Click for fullsize image)

Emergency Alert System's attention signal.
Two tones: 853 Hz and 960 Hz sine waves.

Never been used for national emergency.
Local/regional AMBER Alerts and severe weather. Required Monthly Test.

MIDI 30KB
No browsers support.

Telephone

Try over telephone: only 300-3300 Hz is passed through (landline's analog local-loop, long-distance trunks, and 2G/3G cellular but not 5G/VoLTE nor VOIP (Voice over Internet))

200Hz sine wave	.wav
400Hz sine wave	.wav
3000Hz sine wave	.wav
4000Hz sine wave	.wav

Landline local-loop telephone filters out below 300Hz and above 3300Hz:

15 seconds sound clip sample rate (Hz) sample size (bits) # channels kbps .wav filesize
mono 16-bit 705 kbps 44100 16 1 705 1293 KB Below 3300 Hz. As in telephone.
mono 16-bit 705 kbps 44100 16 1 705 1293 KB Above 3300 Hz. Filtered out in telephone.

15 seconds sound clip	sample rate (Hz)	sample size (bits)	# channels	kbps	.wav filesize
mono 16-bit 705 kbps	44100	16	1	705	1293 KB		Below 3300 Hz. As in telephone.
mono 16-bit 705 kbps	44100	16	1	705	1293 KB		Above 3300 Hz. Filtered out in telephone.