Audio signaling training for bidirectional communications

摘要

Aspects of the subject disclosure provide a card reader for receiving payment card information at a mobile point-of-sale terminal. In some implementations, a reader of the subject technology can include a memory, a conditioning module and a 3.5 mm audio plug including an audio bus that is configured for insertion into a headphone port of a host device, such as a smart phone or tablet computer. Implementations of the subject technology also include a microprocessor configured to perform operations for tuning communication parameters. That is, upon connection of the reader device to the host computing device, the devices can engage in an exchange of carrier waves which the devices exchange can used to not only determine and negotiate operational parameters for the devices that support a highest possible connection speed with acceptable connection quality.

主权项

1. A card reader, comprising:
a read head; an audio plug for engaging a corresponding audio jack associated with a host mobile device; device electronics communicatively coupled to the read head and the audio plug; and a memory comprising a plurality of instructions for causing the device electronics to detect when the audio plug is engaged with the audio jack and to perform, upon detecting the engaging of the audio plug with the audio jack, the steps of: establishing an initial connection with the host mobile device, receiving and decoding a plurality of instances of a first carrier wave transmitted from the host mobile device using different sets of parameters for the device electronics, selecting one of the sets of parameters which supports a highest connection speed between the card reader and the host mobile device at the audio plug; and configuring the device electronics to establish a communications session with the host mobile device based on the selected one of the sets of parameters, and engaging in a payment transaction with the host mobile device using the communications session, the engaging comprising the card reader reading a card funding the payment transaction when the audio plug of the card reader is engaged with the audio jack associated with the host mobile device and during the communications session based on the selected one of the set of parameters supporting the highest connection speed.