General information

This 4-in-1 firmware is valid for

SpeechMike 3 LFH32xx/LFH33xx (first hardware revision)
SpeechMike 3 LFH32xx/LFH33xx (second hardware revision, from serial nr. 510001 onwards - e.g. LFH32005100010 / LFH33005100017)
SpeechMike Premium LFH35xx/LFH36xx (first hardware revision)
SpeechMike Premium LFH35xx/LFH36xx (second hardware revision, from serial nr. 510001 onwards - e.g. LFH35005000011 / LFH36005000018)

The hardware revision does not affect the function nor the appearance of the device. However, second hardware revision devices require different firmware components than first revision devices. This is why different version numbers are displayed on the website (e.g. 3.71/2.65). When running a firmware upgrade, Philips software version 4.6 or later will always pick proper firmware components for the currently connected device.

To run firmware upgrades with this 4-in-1 firmware you need to use SpeechControl version 4.6 (or later), SpeechMike SDK 4.6 (or later) or PRDM 4.3 (or later).

NOTE: This firmware CAN NOT BE USED for upgrades of the SpeechMike Premium Touch SMP37xx/SMP38xx

Release notes

SpeechMike 3 and SpeechMike Premium - second hardware revision

V3.83 technical release 2024-04-16

IMPROVEMENT | This release provides the serial number of the SpeechMike to the USB interface [SMFW-63].
With Google Chrome browsers, SpeechLive users can now seamlessly use their SpeechMike in conjunction with the Google SDK in the new SpeechLive user interface.
Users only have to connect their SpeechMike to SpeechLive once. The browser will remember the device even after closing the browser or shutting down the PC.
For more information on using SpeechLive with the Google SDK, please refer to the SpeechLive online help.

V3.81 technical release 2023-10-24

FIX | This release fixes a very rare issue that caused LFH3200 and SMP3500 series SpeechMikes with firmware 3.79 to freeze. Only unplugging and plugging it back in could fix the problem.
For production reasons, this change is also applied to the SMP3700/3800 series SpeechMikes. [SMFW-59]

V3.79 technical release 2023-07-13

FIX | This version fixes issues with distorted recordings that occurred on some rare MAC computers with the latest operating system macOS Ventura. [SMFW-54]

V3.78 technical release 2023-04-17

FIX | It fixes an issue where customers reported distorted playback sound if they listened to a long recording. The distortion intermittently came and went in waves. [SMFW-51]
IMPROVEMENT | The firmware is now ready to support a new SDK interface with which the setting "disable screensaver during recording" can be changed. [SMFW-41]

V3.77 technical release 2022-09-15

MAINTENANCE | The Firmware 3.77 is a maintenance package that provides more flexibility for production.

V3.76 technical release 2022-07-07

IMPROVEMENT | In some environments the default sampling rate of 22050Hz of the SpeechMike is not accepted and has to be switched to a sampling rate of 44100Hz.
Starting with SpeechControl (PDCC) V4.6, the software includes a sampling rate switch to support these environments.
This firmware version now supports the new SpeechControl software version and allows switching the sampling rate even during Rec or Play. [SMFW-40]

V3.75 technical release 2021-09-23

FIX | Fixed an issue, where a device – being in keyboard mode – will leave the microphone muted state when set to default values by the HID-reset function.

V3.74 technical release 2021-09-02

FIX | Fixed an issue, where a device – being in keyboard or browser mode – will switch to a wrong audio sampling rate when set to default values by the HID-reset function.

V3.73 technical release

FIX | The microphone motion control now works correctly. Depending on the selected configuration the microphone input level can now either be reduced or the microphone can be muted when the device is placed on the desk. If the microphone motion control is disabled the microphone input level will not change at all.
IMPROVEMENT | The SpeechMike Premium LFH3500/3600 series devices now also the support browser mode from this firmware version onwards.
- The Browser mode can be enabled as follows:
  - Press EOL and INS/OVR simultaneously for 3 seconds.
  - All corresponding LEDs will start flashing. You can now change the SpeechMike button mode for 10 seconds.
  - Click on F3 to switch your SpeechMike to Browser mode. The F3-LED will light up to confirm the new button mode setting.
- In browser mode (LFH3500/3600 series only) the RECORD LED now lights up in red during recording.

V3.69 technical release 2020-12-03 (non-published version)

IMPROVEMENT | Improved VmWare compatibility: Exchanged the order of the keyboard and the volume control interface in the USB descriptor to reflect the correct interface identification indexes.
This fixes a device recognition problem that a few customers had when using the SpeechMike in a virtual environment with VmWare.e.

IMPROVEMENT | Improved Windows 10 compatibility: With the latest Windows 10 release, Microsoft has changed the USB audio interface. Due to that Windows 10 did no longer accept the reported default microphone level of the device during the first connection and the microphone level was set to zero (0). To overcome this issue we have adapted the firmware in order to guarantee that the correct microphone lecel is now reported to the USB host.
IMPROVEMENT | More reliable firmware upgrade process: We have learned that approx. 50% of all firmware upgrades were not initiated, because the device denied to upgrade the firmware for safety reasons. After re-evaluating all safety aspects, we were able to make the firmware upgrade process more reliable in that the device also allows a firmware upgrade in playback mode.

V3.66 technical release 2019-11-08

FIX | Fixed issue in ‘Browser’ mode for SpeechMike Premium Touch devices (LFH3700, LFH3710, LFH3720, LFH3800, LFH3810). Button changes made by user are properly saved on the device now.

V3.65 technical release 2019-08-13

IMPROVEMENT | Implemented a new HID-Command for switching between SM2 <-> SM3/SMP mode.

SpeechMike 3 and SpeechMike Premium - first hardware revision

IMPROVEMENT | Implemented a new HID-Command for switching between SM2 <-> SM3/SMP mode.

V2.60 technical release 2018-08-27

IMPROVEMENT | Introduction of additional custom keyboard modes:
- Custom 1 mode: preconfigured for Windows speech recognitionon
- Custom 2 mode: preconfigured for Dragon on Mac
- Custom 3 mode: preconfigured for Dragon on Windows

IMPROVEMENT | Now left and right mouse button work also in Keyboard mode. String descriptor indexes greater than the allowed ones are filtered now.