User Manual EV6550DHAT (CML Microcircuits) - 7
| Manufacturer | CML Microcircuits |
| Description | Raspberry Pi HAT for CMX655D |
| Pages / Page | 12 / 7 — Figure 5 EV6550DHAT GUI - Recording Audio. Playback Channel. Figure 6 … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
Figure 5 EV6550DHAT GUI - Recording Audio. Playback Channel. Figure 6 EV6550DHAT GUI - Playing Audio
Text Version of Document
Raspberry Pi HAT for CMX655D EV6550DHAT
Figure 5 EV6550DHAT GUI - Recording Audio Playback Channel
This function allows pre-recorded audio to be played through the speaker output in mono via the CMX655D Class D amplifier. The “Playback Audio” button becomes available when a compatible wav file has been selected via the “Select File” button. The sound file selected should be S16_LE, Stereo format at the applicable rate of 8000, 16000, 32000 or 48000bps. Once selected, a panel is launched when retrieving and playing the audio. A progress bar and gain indicator are displayed. Audio is taken from the left channel or MEMS U4. Overall playback level may be adjusted from -90dB to 0dB in 1dB steps. Mute and Smooth tick boxes are also available, where smooth eliminates any audible distortion while volume is being changed rapidly and mute sets the playback level to maximum attenuation (-90dB).
Figure 6 EV6550DHAT GUI - Playing Audio
2019 CML Microsystems Plc 7 UM6550DHAT/1 Document Outline User Manual Front Page 1 Introduction 2 CMX655D Ultra-low Power Voice Codec 3 Raspberry Pi Compatibility 4 Power Supplies 5 Handling Precautions 6 Quick Start 6.1 Mounting The EV6550DHAT To The Raspberry Pi 6.2 Software Installation 6.3 GUI Description and Board Operation 7 Supplied Source Code 8 GUI ‘C’ Source Files and Modification 9 Troubleshooting 10 Additional Hardware Information 10.1 Hardware Test Points End of Document
Figure 5 EV6550DHAT GUI - Recording Audio Playback Channel
This function allows pre-recorded audio to be played through the speaker output in mono via the CMX655D Class D amplifier. The “Playback Audio” button becomes available when a compatible wav file has been selected via the “Select File” button. The sound file selected should be S16_LE, Stereo format at the applicable rate of 8000, 16000, 32000 or 48000bps. Once selected, a panel is launched when retrieving and playing the audio. A progress bar and gain indicator are displayed. Audio is taken from the left channel or MEMS U4. Overall playback level may be adjusted from -90dB to 0dB in 1dB steps. Mute and Smooth tick boxes are also available, where smooth eliminates any audible distortion while volume is being changed rapidly and mute sets the playback level to maximum attenuation (-90dB).
Figure 6 EV6550DHAT GUI - Playing Audio
2019 CML Microsystems Plc 7 UM6550DHAT/1 Document Outline User Manual Front Page 1 Introduction 2 CMX655D Ultra-low Power Voice Codec 3 Raspberry Pi Compatibility 4 Power Supplies 5 Handling Precautions 6 Quick Start 6.1 Mounting The EV6550DHAT To The Raspberry Pi 6.2 Software Installation 6.3 GUI Description and Board Operation 7 Supplied Source Code 8 GUI ‘C’ Source Files and Modification 9 Troubleshooting 10 Additional Hardware Information 10.1 Hardware Test Points End of Document
