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--- hardware:sony_wh-ch720n [2024/06/20 11:11] – vreutz
+++ hardware:sony_wh-ch720n [2024/08/27 11:59] (aktuell) – vreutz
@@ Zeile 1: / Zeile 1: @@
-The Sony WH-CH720N headphones represent the latest iteration of Sony's wireless headphone line, succeeding the WH-CH710N model. These over-ear, Bluetooth headphones are equipped with Active Noise Canceling (ANC), Passthrough, virtual surround sound, and multi-device pairing capabilities. They support both Bluetooth and auxiliary (Aux) connections.
+====== Sony WH-CH720N ======
-At the University of Music Karlsruhe (HfM Karlsruhe), we required four wireless headphones for binaural headtracked audio applications in immersive VR and XR projects. We selected these headphones due to their low latency, Passthrough feature, and advanced Bluetooth technology.
-During initial testing, we encountered an issue with the microphone's low input level. When recording or speaking, only very loud noises or direct contact with the microphone were audible. This problem was resolved through a software update provided by Sony, necessitating a reset of the headphones. To reset and update the headphones, press both the Bluetooth button and the middle button on the right side simultaneously until the Bluetooth indicator blinks four times. Further details can be found at the following link:
+The Sony WH-CH720N headphones are over-ear buetooth headphones with Active Noise Canceling (ANC), Passthrough, virtual surround sound, and multi-device pairing capabilities. They support both Bluetooth and auxiliary (Aux) connections.
-Pairing the headphones via Bluetooth is straightforward. Simply press the Bluetooth button for 5 seconds until the Bluetooth indicator light blinks. Below are images of the headphones, the case, and the included cables:
+==== Purpose: ====
-{{:hardware:img_3835.jpg?400|}}
+  * General purpose headphones
-{{:hardware:img_3836.jpg?400|}}
+  * Suitable for VR/XR/MR due to audio passthrough feature
-{{:hardware:img_3838.jpg?400|}}
+  * No latency in cable connection, 30-40ms latency via Bluetooth
-{{:hardware:img_3839.jpg?400|}}
-{{:hardware:img_3840.jpg?400|}}
-{{:hardware:img_3841.jpg?400|}}
-{{:hardware:img_3844.jpg?400|}}
-The WH-CH720N have the posibility of bidirectionality. We tested multiple possibilities:
+==== Quick Guide: ====
-Bidireactionality with cables: We connected the headphones to a Y cable (one in two outs) with the provided AUX cable. Then we connected the two Y cable exits to an Headphone and Microphone to USB adapter. This way, the headphones worked bidirectionally, but only in mono.
+  * Pairing: Press Bluetooth button for 5 seconds until the indicator light blinks.
+  * Get the latest software and drivers [[https://www.sony.de/electronics/support/wireless-headphones-bluetooth-headphones/wh-ch710n/downloads|here]]
-Then, we tried to connect bluetooth and AUX at the same time. Unfortunately, when the headphones were connected by a cable, the Bluetooth connection was not possible. When the Bluetooth was on and the AUX was connected, the headphones made much more white noise. For now, this connection is not possible but we are in contact with the support about it.
-The other bidireactional option is Bluetooth only. On a phone and a mac, the bidirectionality did work, however, on an RPi, the bidirectionality was not possible. We are still testing all of the possibilities of bidirectionality with bluetooth.
+----
+==== Full-duplex audio connection ====
+(simultaneous headphone and microphone use) is possible like so:
+. **full-duplex using minijack cable:**
+  *    Connect to a (TRS) Y-splitter-cable (one socket, two connectors) to the headphones with the provided AUX cable.
+  *    Connect Y-cable outs to the Headphone outs and Microphone inputs of [[https://amzn.eu/d/05VuzZop|USB audio adapter]].
+  *    NB: headphone audio will be mono
+. **full-duplex via Bluetooth:**
+   - Functional on iOS and MacOS (Versions? Software?)
+   - Not possible on an RPi (still testing possibilities).
+. **full-duplex combining Bluetooth and Cable (AUX):**
+   - Bluetooth connection (in or out) not possible when headphones are already connected by aux cable (out or in).
+   - More details [[https://helpguide.sony.net/mdr/2966/v1/de/contents/TP1000776886.html|here]]
+----
+<WRAP center round info 100%>
+Below are Frequency Response and Isolation curves from [[https://www.soundguys.com/sony-wh-ch720n-review-99305/|this review.]]
+{{:hardware:sony_freqresponse_headphones.png?direct&600|Sony WH-CH720N Headphones Frequency Response}}
+{{:hardware:sony_freq_response_mic.png?direct&600|Sony WH-CH720N Microphone Frequency Response}}
+{{:hardware:sony_noise_isolation.png?direct&600|Sony WH-CH720N Noise Isolation Response}}
+</WRAP>
+<WRAP center round tip 60%>
+Use [[https://www.sony.de/electronics/headphones-connect-app|Sony Headphones Connect]] app for calibrating Frequency Response via EQ.
+</WRAP>
+----
+==== Images: ====
+ Headphones, case, and included cables:
+{{:hardware:img_3836.jpg?600|}}
+{{:hardware:img_3838.jpg?600|}}
+{{:hardware:img_3839.jpg?600|}}
+{{:hardware:img_3840.jpg?600|}}
+{{:hardware:img_3841.jpg?600|}}
+{{:hardware:img_3844.jpg?600|}}
+----
+<WRAP center round help 100%>
+**Troubleshooting:**
+  * Issue: Microphone's low input level (only loud noises or direct contact were audible).
+  * Solution: Software update from Sony requiring a reset.
+  * Reset Process: Press Bluetooth and middle button on the right side simultaneously until Bluetooth indicator blinks four times.
+</WRAP>
+==== Further information ====
+  * [[https://www.sony.de/electronics/support/wireless-headphones-bluetooth-headphones/wh-ch720n/manuals|German Manuals]]
+  * [[https://www.sony.com/electronics/support/wireless-headphones-bluetooth-headphones/wh-ch720n/manuals|English Manuals]]
+  * {{ :hardware:son_wh-ch720n_manual_de.pdf |}}
+  * {{ :hardware:sony_wh-ch720n_manual_english.pdf |}}