Cost-effective, multichannel digital logger

A signal processor adapted for use with a PC that includes a USB root hub, and that executes PC software for continuously monitoring digital audio data received via the USB root hub, the PC software:

• decoding line status and signaling information embedded in digital audio data to determine status of a telephone line including a telephone line “going off hook;” and
• upon detecting a telephone line “going off hook,” recording both:
• an audio header that stores information about a telephone call;
• and
• an audio file that stores compressed digital audio data for the telephone call;
• the signal processor comprising:
• a. a multichannel interface circuit for concurrently and continuously receiving digital audio telecommunication signals for at least two telephone calls from a digital hybrid telephone line, and for transmitting digital audio data extracted from the received digital audio telecommunication signals received via the digital hybrid telephone line, the multichannel interface circuit including:
• i. a line interface for electronically conditioning digital audio telecommunication signals received from the digital hybrid telephone line;
• ii. a framer which receives the conditioned digital audio telecommunication signals from the line interface, interfaces the physical layer of digital hybrid telephone line signals received from the line interface, and transmits digital audio data extracted from the received digital audio telecom- munication signals;
• and
• iii. a peripheral controller for exchanging digital audio data with the framer and with a USB hub, and
• b. a USB hub for receiving the digital audio data transmit- ted from the peripheral controller, and for transmitting the digital audio data to the USB root hub of the PC.

A digital logger system adapted for receiving and recording audio telecommunication signals, the digital logger system comprising:

• a multichannel interface circuit for concurrently and continuously receiving digital audio telecommunication signals for at least two telephone calls from a digital hybrid telephone line, and for transmitting digital audio data extracted from the received digital audio telecommunication signals received via the digital hybrid telephone line, the multichannel interface circuit including:
• a. a line interface for electronically conditioning digital audio telecommunication signals received from the digital hybrid telephone line;
• b. a framer which receives the conditioned digital audio telecommunication signals from the line interface, interfaces the physical layer of digital hybrid telephone line signals received from the line interface, and transmits digital audio data extracted from the received digital audio telecommunication signals;
• and
• c. a peripheral controller for exchanging digital audio data with the framer and with a USB hub;
• a USB hub for receiving the digital audio data transmitted from the peripheral controller, and for transmitting the digital audio data to a USB root hub;
• and
• a PC having a USB root hub that is coupled to the USB hub, and which PC:
• receives the digital audio data transmitted from the USB hub;
• and
• executes software that when a telephone line goes “off hook,” records both:
• an audio header that stores information about a telephone call;
• and
• an audio file that stores compressed digital audio data for the telephone call.

A signal processor adapted for use with a PC that includes a USB root hub, and that executes PC software for monitoring digital audio data received via the USB root hub, the PC software:

• upon detecting a telephone line “going off hook,” recording both:
• an audio header that stores information about a telephone call;
• and
• an audio file that stores compressed digital audio data for the telephone call;
• the signal processor comprising:
• a. a multichannel interface circuit for concurrently and continuously receiving digital audio telecommunication signals for at least two telephone calls from a digital hybrid telephone line, and for transmitting digital audio data extracted from the received digital audio telecommu- nication signals received via the digital hybrid tele- phone line, the multichannel interface circuit including:
• i. a line interface for electronically conditioning digital audio telecommunication signals received from the digital hybrid telephone line;
• ii. a framer which receives the conditioned digital audio telecommunication signals from the line interface, interfaces the physical layer of digital hybrid telephone line signals received from the line interface, and transmits digital audio data extracted from the received digital audio telecom- munication signals;
• and
• iii. a peripheral controller for exchanging digital audio data with the framer and with a USB hub, and
• b. a USB hub for receiving the digital audio data transmitted from the peripheral controller, and for transmitting the digital audio data to the USB root hub of the PC.