Browse Prior Art Database

RADIO Control Adapter

IP.com Disclosure Number: IPCOM000061583D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 48K

Publishing Venue

IBM

Related People

Belyeu, SM: AUTHOR

Abstract

This article describes an adapter arrangement which enables a host computer to use a serial data link to control the performance parameters for a remote AM/FM radio. The radio control adapter disclosed herein provides an interface between a host computer and a remote radio. In this disclosure the host computer can be a personal computer. The radio is an AM/FM receiver with an optional cassette tape player and a 1K baud bidirectional serial communications link. The adapter allows the host to control and monitor the radio parameters as follows: A. Current AM/FM channel B. Volume C. Speaker balance D. Equalizer settings E. Fade F. Seek/Scan G. AM/FM preset channels H. Radio ON/OFF. The adapter can also control several support parameters for a CB. These include CB channel, squelch, and signal sensitivity.

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RADIO Control Adapter

This article describes an adapter arrangement which enables a host computer to use a serial data link to control the performance parameters for a remote AM/FM radio. The radio control adapter disclosed herein provides an interface between a host computer and a remote radio. In this disclosure the host computer can be a personal computer. The radio is an AM/FM receiver with an optional cassette tape player and a 1K baud bidirectional serial communications link. The adapter allows the host to control and monitor the radio parameters as follows: A. Current AM/FM channel B. Volume C. Speaker balance D. Equalizer settings E. Fade F. Seek/Scan G. AM/FM preset channels H. Radio ON/OFF. The adapter can also control several support parameters for a CB. These include CB channel, squelch, and signal sensitivity. A block diagram of the present radio control adapter is shown in the drawing. All messages sent from the host to the radio are handled by the host command decoder and placed in the send buffer. Messages sent by the radio pass through the receive buffer and are handled by the radio message decoder. The radio link controller scans the send buffer and converts each byte to the serial protocol used by the radio. It also constructs messages from the serial data sent by the radio and places that information in the receive buffer. The host communicates with the adapter through the common base. The common base includes three registers which are used so that the host can send commands and data to the adapter and the adapter can send responses to the host. The adapter uses a polling technique to receive commands from the host. The host can also poll the registers in the common base to determine if the last command has been read by the adapter or the adapter has sent a response to the host. An interrupt generator (not shown) has been included as part of the interface between the host and the common base so that the adapter can circumvent the polling process and interrupt the host in critical error situations. As the adapter receives messages from the host, it places each byte in a send hold buffer. The typical message length is two bytes. The "initialize at power on" message is the only exception to this rule. This message initializes the radio state so that parameters, such as volume and current channel, are set to the values that were current when the radio was turned off. The send hold buffer has a length of 20 bytes so that it can store a typical initialize message. The status hold buffer stores messages that were initiated by the adapter or the radio until the host is ready to receive them. The buffer is...