Patent ID: 8526927
Filing Date: 2013-09-03
Classification: H04M

Abstract:
1. A telephone apparatus which can transfer a first phone call from a Bluetooth enabled cellular phone to a home phone and, make a second cellular phone call from the home phone via a Bluetooth enabled cellular phone, comprising: a Bluetooth enabled integrated chip (IC) comprising: a Bluetooth modem configured for receiving a Bluetooth signal from a Bluetooth radio frequency (RF) antenna of the cellular phone; a central processing unit (CPU) built-in the IC, for switching controlling of transferring between the first phone call and the second phone call, the CPU comprising a buffer, and a digital signal processor (DSP) and a CODEC (Coder-Decoder) built-in the IC; wherein a received Bluetooth signal is processed into speech and, vice-versa, speech is processed into a Bluetooth signal by the built-in DSP and CODEC in the Bluetooth IC by DSP processing; dual tone multiple frequency (DTMF) dialing tone, Caller ID frequency shift keying (FSK) signal, call waiting channel associated signaling (CAS) tone, call progress tone are also generated and decoded or detected by the built-in DSP by DSP processing, a DTMF and speech signal received from the home phone is temporary stored in the buffer of the CPU first for DTMF detection, and when DTMF is detected, the DTMF signal is muted and the cell phone receives a signal of zero voice level, and the CPU sends a dialing instruction to the cellular phone for dialing a same DTMF tone directly from the cell phone, instead of sending out the received DTMF tone from the Bluetooth IC; wherein the DSP is used to generate at least two sine wave signals based on received signal frequencies for superposition of a required tone.