TH12682A - Radio information is received by television receivers by analyzing frequencies only at the central position. - Google Patents

Abstract

Television receivers include a single tuner for tuning television channels and FM broadcast stations. The tuner operates at a set gain, adjusted in FM reception mode. The tuner acts as the first stage converter of the FM receiver, with a multiplier conversion, where the FM radio's integrated circuit mixer acts as the second stage converter. This arrangement operates at specific first and non-specific IF frequencies. The FM receiver automatically receives broadcasts from the National Broadcasting Service (NWS) at one of seven designated NWS frequencies that operate in the listener area. The receiver displays the number of FM channels tuned.

Claims (5)

1. The television receiver contains a tuner path (102) that operates in the first mode to receive the television radio frequency signal. This tuner path (102) selects a specific television radio frequency signal from a number of television radio frequency signals in response to a control signal (103). The control path produces the control signal (103) to enable the tuner path (102) to select the specific radio frequency signal, and it is such that the tuner path (102) also operates in the second mode as the first frequency converter for the FM broadcast receiver with multiplier conversion to convert the FM signal to the first intermediate frequency. The second frequency converters (180a, 108b) of the FM broadcast receiver with multiplier conversion receive the signal at the first intermediate frequency and convert it to the frequency. The second center and the paths (108d, 108e) for demodulating the audio signal from the said second center frequency, the FM receiver with the said multiplier conversion is also tuned by the said control path (104) to the center position of the data center band. The said FM receiver will automatically receive the broadcast signal at one of the frequencies of that data center band. 2. The television receiver of claim 1 shall be characterized in which the said second center frequency shall be 10.7 MHz. 3. The television receiver of claim 2 is of the characteristic that the second frequency conversion stage (108a, 108b) is an integral part of the integrated circuit of the FM radio receiver. 4. The television receiver of claim 1 is characterized by the frequency band of the data service center including the frequencies 162.400 MHz and 162.550 MHz. 5. The television receiver of claim 4 is characterized in which the said tuner path (102) is tuned in the said second operating mode to the center position of the frequency band of the information center. Such center position is approximately 162.475 MHz. Such tuning of the said tuner path to such center position shall be sufficient to automatically receive each such broadcast frequency in such band.