Can anyone give me a starting point or example code for programming an adjustable audio bandpass filter using the Teensy 4.1?

I recommend posting your question on the PJRC user's forum at https://forum.pjrc.com/. It is monitored by numerous Teensy power users, including the PJRC development staff, who should be able to provide you with assistance.

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Teensy 4.1 ARM Cortex-M7 Processor at 600MHz with a NXP iMXRT1062 (Without pins)

Teensy 4.1 ARM Cortex-M7 Processor at 600MHz with a NXP iMXRT1062 (Without pins)

4.7/5

Product ID: 204800833

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Details

Brand
PJRC
Model Name
TEENSY 4.1 No
Ram Memory Installed Size
1024 MB
Memory Storage Capacity
64 KB
CPU Model
ARM710

⚡600MHz blazing speed

🌐Ethernet-ready for seamless connectivity

🧠1MB LPDDR3 RAM for smooth multitasking

Description

🚀 Power your innovation with the Teensy 4.1 — where speed meets versatility!

GENEROUS 1 MB RAM - 1MB LPDDR3 memory ensures smooth multitasking and rapid data processing for professional-grade applications.
COMPACT LIGHTWEIGHT - Slim 2.4 x 0.7 x 0.15 inch form factor weighing just 0.317 ounces fits perfectly into any workspace or project.
BLAZING FAST PERFORMANCE - 600MHz ARM Cortex-M7, the fastest microcontroller on the market, powers your most demanding projects with ease.
BREADBOARD FRIENDLY DESIGN - All general-purpose I/O pins brought to accessible pads, making prototyping and development effortless.
ETHERNET READY CONNECTIVITY - Built-in Ethernet 10Base-T interface lets you integrate wired networking for reliable, high-speed communication.

The Teensy 4.1 features a cutting-edge 600MHz NXP iMXRT1062 ARM Cortex-M7 processor paired with 1MB LPDDR3 RAM, delivering unmatched speed and multitasking capabilities in a compact, breadboard-friendly design. With Ethernet support and accessible I/O pins, it’s engineered for professional developers and makers who demand high performance and seamless connectivity.

Specifications

Processor	600 MHz arm710
RAM	1024 KB LPDDR3
Graphics Coprocessor	ARM Cortex M7
Wireless Type	Infrared
Brand	PJRC
Series	TEENSY 4.1 No Pins
Item model number	TEENSY41
Operating System	Linux
Item Weight	0.317 ounces
Product Dimensions	2.4 x 0.7 x 0.15 inches
Item Dimensions LxWxH	2.4 x 0.7 x 0.15 inches
Processor Brand	NXP
Number of Processors	1
Computer Memory Type	SDRAM
Hard Drive Interface	Ethernet_10Base-T
Department	mens
Manufacturer	PJRC
ASIN	B088JY7P2H
Date First Available	November 26, 2019

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Teensy 4.1 ARM Cortex-M7 Processor at 600MHz with a NXP iMXRT1062 (Without pins)

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Description

Specifications

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